JP3012001B2 - Pulse generation method and apparatus - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a device for generating a pulse for electric machining in a pulse power supply device for electric machining such as an electric discharge machine and an electrolytic machining machine.

[Prior Art] In a conventional pulse power supply device for electric machining, an ON time and an OFF time of an electric machining pulse are set in advance, and a pulse generator continuously generates an electric machining pulse based on this setting. I am trying to do it.

FIG. 10 (1) is a circuit diagram showing a basic form of a conventional pulse generator.

In this basic type pulse generator 100, the counter 1
01 counts the on-time clock signal, and the count value is compared with the on-time data (data specifying the length of the on-time) by the comparator 102, and when they match, the comparator 102 Output a signal. This match signal is R
Used as a reset signal for the S flip-flop 105. On the other hand, the counter 103 counts the clock signal for the off time, and the count value is compared with the off time data (data specifying the length of the off time) by the comparator 104.
When they match, the comparator 104 outputs a match signal. This coincidence signal is used as a set signal of the RS flip-flop 105. The output pulse of the flip-flop 105 is used as an enable signal of the counter 101, and the output pulse of the flip-flop 105 is
Are used as the enable signal of the counter 103.

Therefore, when the time specified by the off-time data has elapsed, the off-time counter 103 stops counting, the on-time counter 101 starts counting, the output pulse of the RS flip-flop 105 turns on, When the time specified by the time data has elapsed, the on-time counter 101 stops counting, the off-time counter 103 starts counting, the output pulse of the RS flip-flop 105 turns off, and this operation is repeated. Thus, the output signal of the flip-flop 105 becomes the output pulse of the pulse generator 100.

FIG. 10 (2) is a circuit diagram showing a conventional example in which the pulse generator is applied to an electric discharge machine.

Note that the same members as those described above are denoted by the same reference numerals, and description thereof will be omitted. The same applies to the following.

The pulse generator 200 uses the pulse generator 100,
The clock signal for the ON time is generated by the frequency divider 111, and the clock signal for the OFF time is generated by the frequency divider 112, and the CPU outputs the initial value of the ON time and the initial value of the OFF time. Also,
The frequency dividers 111 and 112 divide the frequency of the clock based on the detection information (inter-electrode voltage signal) from the gap G formed by the work W and the electrode E. The on-time and off-time are controlled according to.

FIG. 10 (3) is a circuit diagram showing a conventional example of controlling the length of only the off-time in the pulse generator.

The pulse generator 300 has ROMs 301 and 302 between the CPU and the comparators 102 and 104. The ROM 301 selects on-time length information to be sent to the comparator 102 according to an initial value of the on-time. The ROM 302 selects the off-time length information to be sent to the comparator 104 according to the initial value of the off-time, and the frequency divider 303 divides the clock according to the detection information. The divided clock is sent to the off counter 103.

In the conventional pulse generator shown in FIGS. 10 (2) and (3), the initial values of the ON time and the OFF time and the counter 10
The comparators 102 and 104 output for a predetermined time in response to the outputs of 1 and 103, and the flip-flop 105 outputs a pulse having a desired pulse width in response to these outputs.

However, in the above-mentioned conventional example, which information is selected as a target of evaluation and analysis (what information is selected as detection information), how to evaluate the selected detection information,
It is necessary to specify whether to analyze (how to diagnose the machining state and how to output the length information of the on-time and off-time based on the diagnosis result). , On a dedicated circuit.

In addition, different types of electric machining methods have different hardware configurations, and there is a limit to the amount of hardware that can be accommodated by one IC. Therefore, ICs that can be used for all electric machining methods or multiple electric machining methods are created. And there is a problem that it is difficult to share hardware for a plurality of electric machining methods.

On the other hand, when performing the roughing and the finishing, it is originally desirable that the detection criterion for judging the quality of the voltage of the gap formed by the electrode and the work be different between the roughing and the finishing. However, in the past, the hardware configuration for roughing and finishing was standardized from the policy of sharing the hardware configuration as much as possible, and in this case, the on-time and off-time of the pulse were long. There is a problem that there is a restriction in selecting and outputting the information according to the processing conditions.

Further, in the case of electric discharge machining, for example, the arc voltage in copper-titanium machining is usually 10 to 15 V, the arc voltage in copper-iron machining is usually 20 to 25 V, and the pulse control method for copper-iron machining is copper-iron. When employed for titanium machining, it is diagnosed that abnormal electric discharge occurs up to normal machining, and pulse control is performed too much, so that the length of off time is increased more than necessary, so that machining does not proceed. In other words, there is a problem that the criteria for judging the abnormality differ depending on the combination of the electrode material and the work material, and there is a case that the abnormal discharge state cannot be properly judged due to the difference in the judgment criteria.

In copper-iron processing and copper tungsten-iron processing, the length of τw (time during which voltage is applied between the poles, but no discharge) differs between the punching process involving a jet and the bottoming process. . That is, in the bottoming process, τw is short because abnormal discharge is generated or chips are accumulated, so that deionization cannot be performed, and the process does not proceed. On the other hand, in the blanking process, there is no problem even if τw is controlled to be short because the liquid treatment is good. Therefore, when detecting the time of τw and controlling the pulse on-time, off-time and machining feed, if the control method for punching is always adopted, there is a problem that abnormal discharge is likely to occur in the bottoming. On the contrary, if the control method for bottoming processing is always adopted, there is a problem that the control is excessively performed in the punching processing and the processing does not progress.

Note that the above-described problems also occur when the current peak height Ip of the pulse is set, as in the case of the length information of the ON time and the OFF time of the pulse.

The present invention can provide the pulse ON time, OFF time, and the amount of change in the pulse current peak value with many degrees of freedom, and can perform optimal evaluation and analysis of the detection information as the processing proceeds, In addition, even if the types of electric machining methods such as die-sinking electric discharge machining, wire cut electric discharge machining, electrolytic machining, etc. are different, the hardware related to pulse control can be shared, and abnormalities due to changes in electrode materials and workpiece materials It is an object of the present invention to provide a generator for an electric machining pulse capable of appropriately judging an abnormal discharge state even when the criterion for judging electric discharge is different.

[Disclosure of the Invention] The present invention is a method for generating a series of pulse trains that alternately repeats an on-time and an off-time for performing electric machining, wherein a control device having a CPU includes an on-time initial value and A storage device for storing a plurality of sets of program data relating to pulse generation conditions including an initial value of an off-time; and when a set of machining information relating to electric machining to be executed is input to the control device, the CPU sets the plurality of sets. A set of program data is calculated and selected from among the program data of the above, and is supplied to the pulse generator. The pulse generator can write and store a set of program data supplied from the controller. Storage means and the stored one
A logic circuit unit that performs a logical operation based on a set of program data and generates a pulse train that alternately repeats an on-time and an off-time, and the logic circuit unit evaluates and generates the generated pulse. A diagnostic device that supplies program data for diagnosis from the storage unit, evaluates and diagnoses processing detection information on a processing state from the electric processing unit supplied with the generated processing pulse, and outputs a diagnostic signal; and the storage unit. On-time and off-time calculating means for calculating each length information of on-time and off-time based on program data relating to generation and supply of pulses supplied from the diagnostic device and the diagnostic signal from the diagnostic device, Pulse generating means for supplying the length information of the ON time and the OFF time and outputting a pulse waveform signal to the electric machining section, At this time, when one set of processing information is input to the control device having the CPU and the selected one set of program data is set to be supplied to the storage means of the pulse generator, the pulse generator receives the supplied ON time. A pulse waveform signal is generated by the pulse generating means based on the data of the initial value of the off time and the initial value of the off time, and the electric machining in the electric machining section is executed. After detecting and feeding back to the diagnostic device, the diagnostic device evaluates and diagnoses the processing detection information based on the program data, outputs a diagnostic signal, and calculates the on-time and off-time using the program. A function for calculating and outputting the length information of the ON time and the OFF time based on the data and the diagnostic signal, and outputting the pulse waveform signal to the pulse generating means. Characterized in that to repeat.

Therefore, according to the present invention, program data according to a machining request is output, a machining state is diagnosed based on the program data, a diagnostic signal is output, and a long on-time is determined based on the diagnostic signal and the program data. Information, length of off-time information, and magnitude information of the current peak value, and generates a pulse based on the information, so that the hardware related to pulse control is shared even if the type of electric machining method is different. Even if the criteria for judging abnormal discharge differ due to changes in the electrode material and the work material, the abnormal discharge state can be appropriately diagnosed.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing one embodiment of the present invention.

FIG. 2 is an explanatory diagram for explaining the diagnostic device 20 and the on / off time calculating means 30 in the above embodiment.

3 (1) to 3 (4) are diagrams showing examples of program data and the like in the above embodiment.

FIGS. 4 (1) to (10) are circuit diagrams more specifically showing the main parts of the above embodiment.

FIG. 5 is a flowchart showing the operation of the above embodiment.

FIG. 6 is a time chart showing a process of generating a check pulse, generating a detection stop signal, and generating an F signal and a B signal inside the judging means 25 in the above embodiment, taking electric discharge machining as an example.

FIG. 7 is a time chart showing the operation of the on-time control determining means 50 in the above embodiment, taking electric discharge machining as an example.

FIG. 8 is a time chart showing an example of controlling the ON time in the ON / OFF time calculating means 30 in the above embodiment.

FIGS. 9 (1) and 9 (2) are tables showing examples of data setting in the pulse width change control logic circuit shown in FIG.

FIGS. 10 (1) to (3) are diagrams showing a conventional pulse generator.

FIG. 11 is a block diagram showing an embodiment in which a function capable of controlling the current peak value Ip is added to the embodiment shown in FIG.

FIGS. 12 (1) to (3) are diagrams showing program data added by controlling the current peak value Ip.

FIGS. 13 (1) and (2) show detection information selection means, respectively.
21i is a circuit diagram showing an example of the check pulse generating means 23i, and FIG. 13 (3) is a circuit diagram showing an example of a switching circuit in the embodiment which also controls the current peak value Ip.

BEST MODE FOR CARRYING OUT THE INVENTION FIG. 1 is a block diagram showing an embodiment of the present invention.

The pulse generator 2 of this embodiment is used for electric machining such as an electric discharge machine, electrolytic machining, etc., and a storage means 10 for storing data from the outside, and a detection state of a gap is evaluated to determine a machining state. Diagnosis device 20, on / off time calculation means 30 for enabling a pulse width change control logic circuit for changing and controlling a pulse width based on a result of diagnosis to be changeable by program data, and continuously generating electric machining pulses. A large scale integrated circuit manufactured for generating pulses for electric machining having the pulse generating means 40.

The pulse generator 2 receives an address, data, and a write enable from the CPU 1 (for example, 87C196KB manufactured by Intel Corp.), receives detection information from a sensor or the like about a processing state of the electric processing unit, and generates a pulse waveform corresponding to the detection information. Is output. A specific example of the above address and its data is
This is shown in FIG. The pulse generator 2 includes a storage unit 10, a diagnosis unit 20, and an on / off time calculation unit 30.
The diagnostic device 20 includes a detection information selection unit 21, a threshold setting unit 22, a tucking pulse generation unit 23, a detection stop signal generation unit 24, and a determination unit 25. are doing.

The storage means 10 includes a number of registers for storing on-time initial value data, off-time initial value data, and program data received from the CPU 1 when receiving the write enable signal.

The detection information selection means 21 is a means for selecting one of a plurality of pieces of detection information input from outside the pulse generator 2. Note that the detection information is information indicating a processing state.

The threshold value setting means 22 sets a threshold value (detection reference value) relating to the selected detection information, outputs an evaluation signal that considers that the detection information is equal to or more than the threshold value as good (or bad), and outputs the evaluation signal. This is a means for outputting a processing start evaluation signal that regards the case where the detection information is equal to or greater than the set threshold value as processing (or not processing).

The check pulse generation unit 23 starts the discharge for each pulse in the pulse on-clamp control, that is, from the rising of the machining start evaluation signal (or the rising of the gate signal).
A means for controlling the timing up to the position where the ON check pulse and the OFF check pulse are generated, and a means for generating an ON check pulse and an OFF check pulse for determining which position in the discharge pulse is to be detected. is there.

The detection stop signal generating means 24 is a means for outputting a detection stop signal for inhibiting the operation of detecting the machining state for a set time from the rise of the gate signal.

The determining means 25 generates a diagnostic signal indicating a diagnostic result of the machining state based on the evaluation signal, the check pulse, and the detection stop signal,
This means is generated every on-time and off-time.

The ON / OFF time calculating means 30 is a means for outputting ON time length information and OFF time length information based on the diagnostic signal and the program data.

The pulse generating means 40 is a means for continuously generating an electric machining pulse in accordance with the ON time length information and the OFF time length information.

In the above embodiment, the detection information selected by the detection information selection means 21, the threshold value set by the threshold value setting means 22, the detection stop time set by the detection stop signal generation means 24, the detection stop time set by the check pulse generation means 23 The generation timing of the check pulse, the diagnostic signal in the determination means 25, the ON time length information output by the ON / OFF time calculation means 30, and the OFF time length information are all programmable.

FIG. 2 is an explanatory diagram for explaining the diagnostic device 20 and the on / off time calculating means 30 in the above embodiment.

The diagnostic device 20 is actually a single diagnostic control logic circuit, but essentially, as shown in FIG. 2, a copper-iron diagnostic control logic circuit, a copper-titanium diagnostic control logic circuit, It has a plurality of functions such as a diagnostic control logic circuit for copper tungsten and iron, and operates by inputting a set of processing information (processing request) to the CPU 1 and a set of program data selected from a plurality of sets of storage devices. Is written in the storage means 10 of the pulse generator 2, and the function of one diagnostic control logic circuit is selected from among them. Also, the on / off time calculating means 30 is actually one pulse width change control logic circuit. However, as shown in FIG.
It has multiple functions, such as a pulse width change control logic circuit for iron, a pulse width change control logic circuit for copper-titanium, and a pulse width change control logic circuit for copper tungsten-iron, and has a set of processing information (processing request ), A set of program data selected from a plurality of sets of storage devices is written to the storage means 10 of the pulse generator 2 so that the function of one pulse width change control logic circuit is set from among them. Is the choice.

Therefore, the pulse generator 2 has a large number of combinations of the diagnostic logic circuit and the pulse width change control logic circuit while having one circuit configuration, and selects an optimum combination from the combination according to the processing information. You can do it.

FIG. 3 (1) shows an example of initial value data of on-time and off-time and program data transferred from the CPU 1 to the on / off-time calculating means 30 via the storage means 10 in the above embodiment. It is a chart.

The “program data” is based on the processing information
U is the data to be set. In addition, the "processing information"
Are the type of the electric machining method, the material of the work, the material of the electrode, the characteristics of the working fluid, the state of the liquid treatment, the requirements of the operator, and the like.
The “worker's requirements” are surface roughness, processing speed, electrode wear rate, and the like. When the processing information changes as the processing progresses, the operator may specify in advance that the processing information is changed as the processing progresses, or change the processing information during the processing. The initial value data of the ON time and the OFF time may be arbitrarily set by the operator at the start of machining or during machining, and is handled as one of program data set according to machining information. Is also good.

In FIG. 3A, of the program data,
The data corresponding to address 00 _HEX is the initial value of the on-time, and this initial value is defined by 16 bits.
_The data corresponding to _HEX is the initial value of the off time, and this value is also defined by 16 bits.

The other program data is constituted by data for setting the increase width, the decrease width, the upper limit value, the lower limit value, and the presence / absence of control of the ON time of the pulse output from the pulse generator 2. For example, the data corresponding to the address 08 _HEX is the increase in the ON time, and the increase is defined by 16 bits. The data corresponding to the address 24 _HEX is the increase in the OFF time, and the increase is also 16 bits. Specified in bits. Address 5E
_The 1-bit data corresponding to _HEX is data for setting the presence or absence of the on-time control. When the bit is set to “0”, each on-time control is set to be executed, and the bit is set to “1”. Is set to not execute the on-time control. The other program data is set in the same manner as described above.

FIG. 3 (2) shows an example of a pulse waveform output by the pulse generator 40 when the on-time and the off-time are operated according to the initial values. The initial values of the on-time and the off-time can be set in the range of 200 ns to 6553.7 μs in units of 100 ns. Of course, by changing the clock generation circuit (not shown) that sends the clock to the pulse generation device 2, the setting may be made in another time range and another time unit.

FIGS. 3 (3) and (4) show the CPU 1 in the above embodiment.
4 is a chart showing an example of program data transferred from the storage device 10 to the diagnostic device 20 via the storage means 10;

The program data shown in FIG. 3 (3) includes control mode selection, F signal continuation number setting, B signal continuation number setting, and sampling number in the reference value judgment mode in each of the on-time control and the off-time control. Setting, a reference value setting of the F signal, a reference value setting of the B signal, a setting of a judgment mode in increase control, a setting of a judgment mode in decrease control, a setting of a judgment mode in reset control, and a setting of a check pulse position. .

Next, each setting shown in FIG. 3 (3) will be described in detail.

The content corresponding to the program data address 10 _HEX is “mode setting in on-time control”. Here, the “control” is “increase control”, “decrease control”, and “reset control”, and “mode” is a combination of the above three controls. Further, “increase control” is control for increasing the current on-time length information by a certain length, and “decrease control” is control for decreasing the current on-time length information by a certain length. The “reset control” is a control for resetting the current on-time length information to an initial value.

And the data corresponding to the address 10 _HEX is “00”,
“01” and “10” are “on-time reduction / reset mode”, which is a combination of reduction control and reset control in on-time control, and a combination of increase control and reset control in on-time control, respectively. "Increased on-time
This indicates that the "reset mode" and the "on-time increase / decrease / reset mode" which is a combination of the increase control, the decrease control, and the reset control in the on-time control are set.

The contents corresponding to the program data addresses 1C _HEX , 1E _HEX , and 20 _HEX are for setting a judgment mode for judging a machining state for each operation of increase control, decrease control, and reset control during the on-time. In this judgment mode,
“Continuous number F signal judgment mode”, “reference value F signal judgment mode”, “continuous number B signal judgment mode”, and “reference value B”
There is a "signal determination mode."

In the above embodiment, the "F signal" is a signal that is output when the value of the detection information is larger than the threshold and when the value equal to or higher than the threshold is evaluated as good. Also,
The “B signal” is a signal that is output when the value of the detection information is smaller than the threshold value and when the value equal to or smaller than the threshold value is evaluated as defective.

The “F signal” and the “B signal” are originally determined by the evaluation signal from the threshold value setting unit 22, the check pulse from the check pulse generation unit 23, and the detection stop signal from the detection stop signal generation unit 24. And has a wider meaning than in the above embodiment.

For example, in the data setting corresponding to 1C _HEX , the “continuous number F signal determination mode” is a mode in which the ON time is increased when the number of F signals continuously reaches the set number. The “continuous number B signal determination mode” is a mode in which on-time increase control is performed when the number of B signals continuously reaches a set number. Also,
For example, in the data setting corresponding to 1C _HEX , the “reference value F signal determination mode” is a mode in which on-time increase control is performed in accordance with the ratio between the F signal generation circuit and the number of samples. The “reference value B signal determination mode” is a mode in which on-time increase control is performed in accordance with the ratio between the B signal generation circuit and the number of samples.

Then, as data corresponding to the address 1C _HEX , "0
When "0", "10", "01", and "11" are set, "continuous number F signal judgment mode" is set, and "continuous number B signal judgment mode" and "reference value F signal judgment" are set. Mode "and" reference mode B signal determination mode "are set.

Also, by setting data corresponding to the addresses 1E _HEX and 20 _HEX , the on-time reduction control and the on-time reset control are set. In these cases, as in the above,
"Continuous number F signal judgment mode", "Continuous number B signal judgment mode", "Reference value F signal judgment mode", "Reference value B"
Signal judgment mode "can be set.

Further, by setting data corresponding to the addresses 12 _HEX , 14 _HEX , and 16 _HEX , the number of continuous F signals, the number of continuous B signals, and the number of samples in the reference value determination mode in the on-time control can be set.

By setting 16-bit data corresponding to the address 22 _HEX , the check pulse position in the on-time control can be set. This "check pulse"
Is a pulse that determines a portion to be diagnosed of the evaluation signal, and is a pulse that takes a timing from a rise of the evaluation signal (or a rise of the gate signal) to a position where the ON check pulse is generated.

By setting data corresponding to addresses 2C _{HEX to} 3E _HEX , the same setting as the above-described on-time control can be performed for the off-time control.

The program data shown in FIG. 3 (4) is data for selecting a threshold, detection information, and setting an evaluation at a level higher than the threshold in each of the on-time control and the off-time control. In addition, the presence / absence of on-clamp (operation for controlling the on-time after the start of discharge), the presence / absence of a detection stop signal, and the width of the detection stop signal are set.

Next, each setting of the program data shown in FIG. 3 (4) will be described in detail.

By setting 8-bit data corresponding to the address A _HEX to a predetermined value, a threshold value for on-time control is set. When 1-bit data corresponding to the address BA _HEX is set to “0”, the detection information of the port A is set so as to be selected for the on-time control. When the data is set to “1”, the detection information is turned on. It is set so that the detection information of port B is selected for time control.
When 1-bit data corresponding to the address C4 _HEX is set to "0", an evaluation signal for setting a level higher than the threshold value to be good is set. When the data is set to "1", a level higher than the threshold value is considered to be bad. An evaluation signal is set.

Although the above description is for off-time control, program data for off-time control can be similarly set.

Further, when 1-bit data corresponding to the address 64 _HEX is set to “0” and “1”, the presence / absence of off-clamp is set, respectively. When the 1-bit data corresponding to the address 74 _HEX is set to “0” and “1”, the presence / absence of the detection stop signal is set, respectively. Further, by setting 10-bit data corresponding to the address A2 _HEX to a predetermined value, the time width of the detection stop signal can be set to a desired value.

FIG. 4A is a circuit diagram showing an example of the detection information selection means 21 and the threshold value setting means 22 in the above embodiment.

The detection information selection means 21 is composed of selectors 21a and 21b. The selector 21a controls the port A for on-time control in accordance with data (select signal) corresponding to the address BA _HEX in the program data shown in FIG.
And the detection information of port B are selected and output. Port A and port B are input terminals for outputting detection information indicating a processing state.

The selector 21b selects the detection information of the port A or the detection information of the port B for off-time control in accordance with the data (select signal) corresponding to the address BC _HEX in the program data shown in FIG. Output. In this case, if the select signals are “0” and “1”, the selector 21b outputs the detection information of the port A and the detection information of the port B, respectively.

When the above embodiment is used in an electric discharge machine, for example,
The detection information of the port A is a voltage signal between the electrodes formed between the electrode and the work (a voltage signal between the electrodes), and the detection information of the port B is a current signal between the electrodes. The voltage signal between ports at port A is
The digital signal is converted into a digital signal by an A / D converter (not shown), and the minimum unit of the digital signal is, for example, 1V. Note that a voltage between contacts may be selected for controlling the on-time, and a voltage between contacts may be selected for controlling the off-time.

The detection information selecting means 21 shown in FIG. 1 and FIG. 4 (1) has two input terminals of ports A and B to input the detection information. A terminal may be added, and other detection information may be input to the added input terminal. In this case, as the other detection information, signals relating to the temperature of the machining fluid in the electric machining, the machining frequency of the electric machining, the high-frequency component of the electric discharge machining, the brightness of the discharge, the color tone of the discharge, the sound of the discharge, and the like can be considered. Further, the detection information may be at least two of a voltage signal between the electrodes formed by the electrode and the work, a current signal flowing between the electrodes, and other signals according to the discharge state. Furthermore, two or more pieces of detection information may be taken in at the same time, and two or more evaluation signals may be generated. In this case, it is easy to realize by preparing the required number of threshold setting means 22 and address registers.

According to the above-described method, one piece of hardware (the pulse generator 2 composed of one large-scale integrated circuit including the detection information selection unit 21) converts a desired detection signal out of a plurality of pieces of detection information into an on-time control signal. And for off-time control can be selected arbitrarily.

In FIG. 4A, the threshold value setting means 22 includes a comparator 22.
a, 22c and selectors 22b, 22d.

The comparator 22a compares the detection information (inter-electrode voltage in the above embodiment) from the detection information selecting means 21 with a threshold for on-time control (data corresponding to the address AE _HEX ), and compares the threshold. "1" when the value of the detection information is greater than
The comparator 22c compares the detection information (inter-electrode voltage in the case of the above embodiment) with an off-time control threshold (data corresponding to the address BO _HEX ). Outputs "1" when the detection information is large.

The selector 22b responds to the data corresponding to the address C4 _HEX (data that determines the evaluation of the inter-electrode voltage that is equal to or more than the on-threshold). It outputs an evaluation signal “1” regarded as good or an evaluation signal “0” regarded as defective.

The selector 22d, according to the data corresponding to the address C6 _HEX (data defining the evaluation of the detection information equal to or greater than the OFF threshold), if the detection information at that time is equal to or greater than the OFF time control threshold, It outputs an evaluation signal “1” to be regarded or an evaluation signal “0” to be regarded as defective.

According to the above, the threshold value for the detection information can be arbitrarily set by one piece of hardware (the pulse generation device 2 composed of one large-scale integrated circuit including the threshold value setting means 22), and the threshold value can be set to be equal to or larger than the threshold value (or ) Can be set arbitrarily for the detection information, and can be independently set for each of the on-time control and the off-time control.

FIG. 4 (2) shows the pulse generating means in the above embodiment.
23 is a circuit diagram illustrating an example of a circuit 23. FIG.

The check pulse generating means 23 receives a gate signal (output pulse of the pulse generating means 40) and a processing start evaluation signal (output pulse of the threshold value setting means 22), and outputs on-clamp instruction data (data corresponding to the address 64 _HEX ). The gate signal or the processing start evaluation signal is selected according to the following. In this case, when performing the on-clamp, the on-clamp instruction data is set to “0”, the selector 23a detects the machining start evaluation signal, that is, the rising of the discharge start caused by performing the on-clamp, and thereafter outputs the signal “1”. When on-clamp is not performed, the on-clamp instruction data is set to "1", and the selector 23a detects the rise of the gate signal and thereafter outputs the signal "1". The counters 23b and 23d start counting clocks when the signal from the selector 23a becomes "1".

The comparator 23c outputs an on-time control check pulse when the count value of the counter 23b matches the on-time control check pulse position data (data corresponding to the address _22HEX ). The comparator 23e outputs an off check pulse when the value of the counter 23d matches the off check pulse position data (data corresponding to the address 3E _HEX ).

According to the above, the timing up to the check pulse position can be arbitrarily set by one piece of hardware (the pulse generator 2 composed of one large-scale integrated circuit including the check pulse generating means 23). The on-time control and the off-time control can be set independently, and the control can be distinguished depending on the presence or absence of the on-clamp.

FIG. 4 (3) is a circuit diagram showing an example of the detection stop signal generating means 24 in the above embodiment.

The detection stop signal generating means 24 has a counter 24a, a comparator 24b, a differentiating circuit 24c using a one-shot multivibrator, an RS flip-flop 24d, and a selector 24e.

The counter 24a is a counter that counts the clock when the gate signal from the pulse generation means 40 is "1" and is reset when the gate signal is "0". Is output when the count value and the width of the detection stop signal (data corresponding to the address A2 _HEX ) match. The test stop signal is a signal for prohibiting the operation of determining the machining state based on the detection information by the width of the detection stop signal. The detection stop signal stops the detection of the evaluation signal from when the gate signal rises to when it reaches a predetermined level. As a result, the reliability of the detection information for detecting the processing state is improved.

Differentiating circuit 24c, when the gate signal rises,
This is a circuit that outputs one pulse. RS flip-flop
24d is a circuit which is set when the differentiating circuit 24c outputs a pulse, and is reset when the comparator 24b outputs "1". The selector 24e outputs the detection stop signal to the determination means 25 only when the detection stop instruction signal (data corresponding to the address 74 _HEX ) is output (when the detection stop instruction signal is "1"). It is.

As described above, in the detection stop signal generating means 24,
As shown in the lower part of FIG. 4 (3), a detection stop signal is generated when the gate signal rises, and the width of the detection stop signal can be arbitrarily set.

FIG. 4 (4) is a diagram showing that the judging means 25 is composed of an on-time control judging means 50 and an off-time control judging means 60.

FIG. 4 (5) is a circuit diagram showing an example of the on-time control determining means 50 in the above embodiment.

The on-time control determining means 50 includes an F / B signal generation circuit 51 for generating an F signal and a B signal, and a reference value F / B signal generation circuit 52 for generating a reference value F signal and a reference value B signal. A continuous number F / B signal generating circuit 53 for generating a continuous number F signal and a continuous number B signal; a selection circuit 54; an UP signal for generating an UP signal, a DO signal, a RE signal, and a diagnostic signal having the content thereof. / DO / RE signal generation circuit 55.

The “reference value F signal” is a signal that is output when the number of occurrences of the F signal reaches a predetermined reference value.
The "signal" is a signal output when the number of occurrences of the B signal reaches a predetermined reference value. Also, "Continuous number F signal"
Is a signal that is output when the F signal is continuously generated by a predetermined continuous number, and the “continuous number B signal” is output when the B signal is continuously generated by a predetermined continuous number. Signal.

Further, the “UP signal” is a signal that increases the on-time or the off-time, the “DO signal” is a signal that decreases the on-time or the off-time, and the “RE signal” is a signal that increases the on-time or the off-time. This is a signal for returning to the initial set value.

The F / B signal generation circuit 51 includes an OR circuit 51a, AND circuits 51b, 51
c, and inverters 51d and 51e. According to the evaluation signal from the threshold setting unit 22, the check pulse from the check pulse generation unit 23, and the detection stop signal from the detection stop signal generation unit 24, F And a B signal.

In the above embodiment, the F signal is a signal that outputs “1” if the evaluation signal is “1” when the check pulse is input, and the B signal is the evaluation signal when the check pulse is input. Is a signal that outputs “1” if “0”. However, even when the check pulse is input, if the detection stop signal is “1”, the check pulse is invalidated, so that neither the F signal nor the B signal outputs “1” regardless of the evaluation signal.

The reference value F / B signal generation circuit 52 generates a reference value of the F signal (data corresponding to address 18 _HEX ), a sampling number (data corresponding to address 16 _HEX ), and a reference value of the B signal (address 1A _HEX) . The reference value F signal is output based on the corresponding data) and the F signal and the B signal from the F / B signal generation circuit 51.

The counter 52a counts the F signal,
When the count value matches the reference value of the F signal, the comparator 52b outputs the reference value F signal. That is, the reference value F signal becomes “1”. The F signal and the B signal are ORed by an OR circuit 52.
The counter 52d counts through c, and when the count value matches the sampling number, the counters 52a, 52d,
The comparator 52e outputs a signal for resetting 52g.

The counter 52g counts the B signal,
When the count value matches the reference value of the B signal, the comparator 52h outputs the reference value B signal. That is, the reference value B
The signal becomes "1". For example, by setting the data corresponding to address 16 _HEX ,
_Assuming that the reference value of the F signal is set to 4 by setting to 10 and setting the data corresponding to the address 18 _HEX , when the F signal is included 4 times or more during 10 samplings, The reference value F signal becomes “1”.

The continuation number F / B signal generation circuit 53 performs the continuation number F signal and the continuation number B signal based on the set value of the continuation number of the F signal, the set value of the continuation number of the B signal, and the F signal and the B signal. And a circuit that outputs The number of consecutive set value of the F signal, the address 12 _HEX
Is set by the data corresponding to the address 14 _HEX .

The counter 53a counts the F signal, and when the B signal is received, the count value is reset, thereby counting the number of continuous F signals. When the count value matches the continuous signal set value of the F signal, the comparator 53b outputs the continuous signal F signal. That is, the continuous number F signal becomes “1”. The counter 53c
The B signal is counted, and the count value is reset when the F signal is received, thereby counting the B signal and the number of continuations. When this count value matches the continuous signal set value of the B signal, the comparator 53d
Output a continuous number B signal. That is, the continuous number B signal becomes “1”.

The selecting means 54 has selectors 54a, 54b, 54c, and each selector selectively outputs a reference value F signal, a reference value B signal, a continuous number F signal, and a continuous number B signal. selector
Reference numerals 54a, 54b, and 54c relate to a determination mode in the on-time increase control, a determination mode in the on-time reduction control, and a determination mode in the on-time reset control, respectively. In addition, the selector 54a outputs the select signal “0”.
If the values are "0", "01", "10", and "11", respectively, the determination mode of the continuous number F signal, the determination mode of the reference value F signal, the determination mode of the continuous number B signal, and the determination of the reference value B signal. Set the mode. The selectors 54b and 54c are the same as the selector 54a.

The UP / DO / RE signal generation circuit 55 includes a selector 55a and an OR circuit 55.
b, 55c, AND circuits 55e and 55f, UP signal, DO signal, RE signal in each control of increase control, decrease control, reset control
It outputs a signal.

FIG. 4 (6) is a diagram showing an example of the off-time control determining means in the above embodiment.

The off-time control determining means 60 has substantially the same configuration as the on-time control determining means 50, and the reference numerals of the respective elements are changed from the 50's to the 60's.

According to the above, one hardware (judgment means
The pulse generator 2) comprising one large-scale integrated circuit including 25 easily generates a signal for increasing, decreasing, and returning to the initial value independently of the on-time and the off-time. be able to.

FIG. 4 (7) shows that the ON / OFF time calculation circuit 30 in the above embodiment is different from the ON / OFF time calculation circuit 70 and the OFF time calculation circuit
And FIG.

FIG. 4 (8) is a diagram showing a specific example of the on-time calculation circuit 70 in the above embodiment.

The selector 71 selects an increase width of the on-time and a decrease width of the on-time based on the UP signal. That is, when the UP signal is “1”, the selector 71 outputs data of the increase width of the on-time, and when the UP signal is “0”, it outputs the decrease width of the on-time. . Further, the increase width of the ON time is set by setting data corresponding to the address 08 _HEX, and the decrease width of the ON time is set by setting data corresponding to the address 0A _HEX .

When the UP signal for increasing the on-time is "1", the ALU 72 adds the current on-time length information and the already set increase amount of the on-time. When the DO signal for reducing the time is "1", the circuit subtracts the previously set decrease width of the ON time from the current ON time length information.

The selector 73 selects and outputs one of the ON time length information output from the ALU 72, the ON time lower limit value, and the ON time upper limit value. The ON time lower limit is set by setting data corresponding to the address 0E _HEX , and the ON time upper limit is set at the address 0C _HEX.
Is set by setting data corresponding to.

The subtractor 74a subtracts the on-time decrease width from the current on-time length information, and outputs the subtracted data to the comparator 74. The adder 75a adds the increase amount of the on-time to the current on-time length information, and outputs the added data to the comparator 75.

The comparator 74 compares the data from the subtractor 74a with the on-time lower limit, and outputs “1” when the subtracted data is shorter than the on-time lower limit. Therefore, the length information longer than the upper limit value of the on-time and the length information shorter than the lower limit value of the on-time are not sent to the pulse generator 40.

The OR circuit 77a is a circuit that passes a signal obtained by inverting an on-time control instruction signal (data corresponding to the address 5E _HEX ) instructing to control the on-time by the inverter 77b and the RE signal.

When the RE signal is output or when the on-time control is not performed, the selector 78 outputs the data of the desired set value of the on-time (data corresponding to the address 00 _HEX ). In other cases, the selector 73 outputs the data. The data is output as on-time length information.

The AND circuit 77c is a circuit that performs an AND operation between the DO signal and the output data from the comparator 74, and is for preventing the length of the ON time from becoming shorter than its lower limit. AND
The circuit 77d is a circuit that performs an AND operation between the UP signal and the comparator 75. In order to prevent the ON time length from exceeding the upper limit value, a signal for fixing the ON time length information to the upper limit value is used. To the selector 73.

FIG. 4 (9) is a circuit diagram showing an example of the off time calculation circuit 80 in the above embodiment.

The off-time calculation circuit 80 has basically the same circuit configuration as the on-time calculation circuit 70, and its code is
It has been changed to a series.

According to the above, one hardware (the pulse generator 2 composed of one large-scale integrated circuit including the ON / OFF time calculation circuit 30) independently performs the ON time and the OFF time for that time. Increase control, decrease control, return control to the initial value, and upper / lower limit control of the on / off time can be easily performed.

FIG. 4 (10) shows the pulse generating means in the above embodiment.
FIG. 40 is a circuit diagram illustrating an example of a forty.

This pulse generation circuit 40 includes counters 41 and 43 and a comparator
42, 44, an RS flip-flop 45, and an inverter 43a.

The counter 41 counts the clock signal of 10 MHz, and
The counting starts at the rising edge of the pulse waveform that is the output signal of the S flip-flop 45, and the count value becomes 0 at the falling edge.
Is reset to The comparator 42 outputs the on-time length information (binary signal) from the on / off-time calculating means 30
And the count value of the counter 41, and when they match,
A reset signal is sent to the RS flip-flop 45.

The counter 43 counts a clock signal of 10 MHz, starts counting at the falling edge of the pulse waveform that is the output signal of the RS flip-flop 45, and resets the count value to 0 at the rising edge. The comparator 44 compares the OFF time length information (binary signal) from the ON / OFF time calculation means 30 with the count value of the counter 43, and sends a set signal to the RS flip-flop 45 when they match. It is. The output of the RS flip-flop 45 becomes “1” in a set state (on time starts), and its output becomes “0” in a reset state (off time starts).

Thereby, the pulse generation means 40 has an ON time corresponding to the ON time length information from the ON / OFF time calculation means 30, and outputs a pulse waveform having an OFF time corresponding to the OFF time length information. I do.

 Next, the operation of the above embodiment will be described.

FIG. 5 is a flowchart showing the operation of the above embodiment.

In FIG. 5, first, on-time initial value data, off-time initial value data, and program data corresponding to a processing request (input setting of processing information) are written into each register of the storage means 10 (S10). Is transferred to the on / off time calculation means 30 (S20), and the program data is transferred to the diagnostic device 20 (S30). Then, detection information (a signal of a machining state) is input to the diagnostic device 20, a pulse is generated to start electric machining, the machining state is diagnosed based on the program data, and a diagnostic signal as a result is turned on / off.
It is sent to the off-time calculating means 30 (S40), and the on / off-time calculating means 30 calculates based on the diagnostic signal and the program data, and outputs the on-time length information or the off-time length information to each of the above initial values. , Control is performed to change to ON / OFF length information suitable for the detected machining state, and the new ON time length information or OFF time length information is sent to the pulse generation means 40 (S50). The pulse generation means 40 includes information on the length of on time,
Outputs a pulse based on the off-time length information (S6
0).

Among the operations of the above embodiment, the point different from the conventional example shown in FIGS. 10 (2) and (3) is that firstly, program data according to a machining request is used. Third, the on-time length information or off-time length information is controlled based on the diagnostic signal and the program data, which are the diagnostic results. Fourth, the program data can be changed as needed.

 These points are also features of the present invention.

FIG. 6 is a time chart showing a process of generating a check pulse, generating a detection stop signal, and generating an F signal and a B signal inside the judging means 25 in the above embodiment, taking electric discharge machining as an example.

In this time chart, the address BA
_HEX, BC _HEX, AE _HEX, by setting the data corresponding to the BO _HEX, control on time, as the detection information for control off-time, machining gap voltage signal from the port A are both selected, on Thresholds for time control and off-time control are set to 25V and 19V, respectively. Address C4
_By setting both the data corresponding to _HEX and C6 _HEX to “0”, an evaluation that considers a level higher than the threshold to be good is adopted. Further, the on-clamp is performed by setting the data corresponding to the address 64 _HEX to “1”, and the data corresponding to the addresses 22 _HEX and 3E _HEX is set to a predetermined value.
The check pulse position is set after the CT _on time and the CT _off time. Further, by setting the data corresponding to the addresses 74 _HEX and A2 _HEX to predetermined values, the detection stop signal is set to be output for the width shown in the figure.

The generation process of each signal will be described on the premise of the above program data setting.

First, when the gate signal output from the pulse generator 40 rises, the voltage waveform between the electrodes also rises. At this time, the inter-electrode voltage waveform requires a predetermined time to reach the no-load voltage level due to a delay on the circuit. That is, in the state from the rise of the gate signal to the reaching of a certain level, it is not desirable to make the evaluation signal a target of the judgment, so that the detection stop signal generating means 24 outputs the detection stop signal. While the detection stop signal is being generated, neither the F signal nor the B signal is output even if a check pulse is input. That is, while the detection stop signal is being output, the evaluation signal is not used as a determination target. Thereby, the reliability of the diagnosis operation of the electric discharge machining state is improved.

After a lapse of a set time (CT _on time) from the start of discharge, the check pulse generating means 23 outputs an ON check pulse. When this ON check pulse is generated,
The threshold value set by the threshold value setting means 22 is compared with the gap voltage, and the state of the gap voltage at that time is diagnosed. In the time chart shown in FIG. 6, the machining start evaluation signal which rises to “1” due to the end of the detection stop signal falls when the discharge start in the gap is detected and falls, and the set time CT _on of the ON check pulse is reduced. Counting is started, and when a predetermined count value is reached, an ON check pulse is output. At this time, the F signal is output because the voltage between contacts is greater than the ON threshold and the ON control evaluation signal is FINE [1]. Is done. Similarly, after a lapse of a set time (CT _off time) from the start of discharge, an off check pulse is output. The inter-electrode voltage when the OFF check pulse is output is compared with the OFF time control threshold value, and the state of the electric discharge machining at that time is diagnosed. In the time chart shown in FIG. 6, when the OFF check pulse is output, the B signal is output because the OFF control evaluation signal is BAD “0”.

In this way, when the voltage between contacts is detected, the check pulse for ON and the check pulse for OFF are made different from each other, so that the diagnosis of the electric discharge machining state can be performed more appropriately.

FIG. 7 is a time chart showing the operation of the on-time control determining means 50 in the above embodiment, taking electric discharge machining as an example.

Here, 30 μs is set as the initial value of the ON time, the increase width and the decrease width are set to 5 μs and 20 μs, respectively, the width of the detection stop signal is set to 3 μs, the upper limit value of the ON time,
The lower limit is set to 100us and 50us, respectively.

In this time chart, the gap voltage signal is selected as the detection information and the address
By setting the data corresponding to AE _HE to a predetermined value, an ON evaluation signal as shown is output. Further, data corresponding to addresses 10 _HEX , 1C _HEX , 1E _HEX , and 20 _HEX are respectively set to “10”, “00”, “10”,
By setting to “11”, the on-time increase / decrease / reset mode is set as the on-time control mode, the continuous F signal judgment mode is set as the judgment mode in the on-time increase control, and the continuous F signal judgment mode is set as the judgment mode in the on-time decrease control. The determination mode of the reference value B signal is set as the determination mode of the B signal as the determination mode in the on-time reset control.

By setting the data corresponding to the addresses 12 _HEX , 14 _HEX , 16 _HEX , and 1A _HEX to predetermined values, the set value of the number of continuous F signals is set to 1 and the set value of the number of continuous B signals is also set to 1.
The sampling number is set to 10, and the reference value of the B signal is set to 3. Further, in this time chart, "0" is set as data corresponding to the address C4 _HEX , and a level higher than the threshold is regarded as good.

Therefore, if the gap voltage signal is higher than the threshold when the check pulse is generated, an F signal is generated, and each time the F signal is generated once, an UP signal is generated and the gap voltage signal is higher than the threshold. If it is low, a B signal is generated, and a DO signal is generated each time the B signal is generated twice consecutively. The RE signal is generated when the B signal is generated three times during the ten samplings.

The above is an example of controlling the ON time, but the OFF time can also be described in the same manner as described above.

FIG. 8 is a time chart showing an example of controlling the ON time in the ON / OFF time calculating means 30 in the above embodiment.

In this case, by setting the data corresponding to the addresses 08 _HEX , 0A _HEX , 0C _HEX , and 0E _HEX to predetermined values, the on-time increase width is set to 10 us, and the on-time decrease width is set to 7 us.
The upper limit is set to 55us and the lower limit is set to 5us.

Therefore, when the UP signal is generated, the on-time is calculated by adding the increment of 10 us to the current on-time length information, and the DO time is calculated.
When a signal occurs, the current ON time length information is reduced by
Calculate the ON time by subtracting 7 us. When the RE signal is generated, the on-time is returned to the initial value irrespective of the current on-time length information. Further, an example is shown in which, when the decrease width is subtracted from the current on-time length information and the subtracted value is smaller than the lower limit, the on-time is set to the lower limit.

The above is an example of controlling the ON time, but the OFF time can also be described in the same manner as described above.

FIG. 9 is a chart showing an example of set values for realizing two of the pulse width control logic circuits shown in FIG.

FIG. 1A shows a setting example of each program data necessary to realize a logic circuit [1] (logic circuit for copper-iron processing), and FIG. 2B shows a logic circuit [2]. A setting example of each program data required to realize (logic circuit for copper-titanium processing) is shown.

In FIG. 9, "address" is an address corresponding to each program data and is shown in hexadecimal ( _HEX ), and "set value" is the content of the data corresponding to the address and is a decimal number. As shown, one data corresponds to 100 ns for time, one data corresponds to one time for the number of times, and one data corresponds to 1 V for the set threshold value.
Further, a gap voltage signal is input from port A as detection information.

In the logic circuit for copper-iron processing shown in FIG. 9 (1), for example, the initial value of the ON time (address 00 _HEX ) is 7 μs, the initial value of the OFF time (address 02 _HEX ) is 7 μs, "Yes" for time control (address 5E _HEX ) and off-time control (address 60 _HEX )
Is specified, and the increase width (address 08 _HEX ) and decrease width (address 0A _HEX ) of the ON time are 2 μs,
5 μs is specified, and is set as... The logic circuit for copper-titanium processing shown in FIG. 9 (2) is set similarly to the above.

Although specific setting values are not shown, setting of program data necessary for realizing other logic circuits such as a logic circuit for copper tungsten-iron processing can be similarly performed.

FIGS. 9 (1) and 9 (2) show setting examples of each program data necessary to realize the two logic circuits [1] and [2]. The generator 2 does not include a plurality of logic circuits. In other words, only one piece of hardware is incorporated in one pulse generator 2, and depending on the set of program data, when the same pulse generator 2 exists (although it is one piece of hardware), the same as the logic circuit [1] In other cases, it functions in the same manner as the logic circuit [2], and in other cases, it functions in the same manner as the other logic circuits. Of course, if you keep the same set of program data,
It always performs the same function as the same logic circuit.

In addition, as can be easily understood from the chart, by adding the program data, it is possible to add many and various parameters (processing requirements) of the pulse control. Therefore,
The above embodiment has the same effect as having one hardware but having an infinite number of logic circuits.

Therefore, in the above embodiment, even if the type of the electric machining method is different, only one piece of hardware external to the control logic circuit (LSI) related to the pulse control is required, and a large number of circuits having different hardware configurations are provided. No need to prepare. Further, since the optimum pulse control can be performed according to the material of the electrode used for processing, the material of the work, the state of the liquid processing, and the like, the processing speed can be increased.

By the way, in the conventional apparatus, when the processing state is poor, the length of the on-time is fixed to the initial value, the off-time is gradually increased, and when the upper limit is reached, the on-time is reduced for the first time. I have. In other words, in the conventional device, when the processing state is poor, only the off time is extended,
When the upper limit is reached, only the on-time is controlled to be shortened. On the other hand, in the embodiment shown in FIG. 9, since the on-time and the off-time are controlled independently, the on-time and the off-time can be controlled alternately or simultaneously. Can be controlled.

The storage means 10 may store, in addition to the above-described program data, program data that is changed in accordance with a change in a machining request during machining. For example, if an NC program is created so that a machining request is changed when a predetermined block of the machining program ends, new program data corresponding to the changed machining request is stored when the predetermined block ends. Means 10
Is stored. In addition, as the machining progresses, the NC detects the machining depth, liquid processing state, etc., changes the machining request appropriately based on the detection results, and creates a new program corresponding to the changed machining request. The data is stored in the storage means 10. Alternatively, when the operator changes the processing request during the processing, new program data corresponding to the changed processing request is stored in the storage unit 10. Further, in the case where a diagnosis result indicating that the on-time needs to be lengthened forever or the like is obtained, the actual machining request does not match the diagnosis result.In this case, the diagnosis result is fed back to the CPU 1 and the program Change data. Also at this time, new program data corresponding to the changed machining request is stored in the storage means 10. In this case, normal feedback control or fuzzy control may be applied.

Although the above embodiment is directed to electric machining, it can be applied to a device that generates pulses used for purposes other than electric machining, such as laser machining and motor control.

Next, an embodiment in which electric discharge machining is performed while controlling the current peak value Ip will be described.

FIG. 11 is a block diagram showing an embodiment in which a function capable of controlling the current peak value Ip is added to the embodiment shown in FIG.

In addition, in FIG. 11 and subsequent figures, the suffix “i” at the end of the code means that it also has a function of controlling the current peak value Ip, and in terms of controlling the ON time and the OFF time, The member having the reference number with “i” is the same as the member having the reference number with “i” controlled from the reference number.

The pulse generator 2i is basically the same as the pulse generator 2, except that a function capable of controlling the current peak value Ip is added. The storage means 10 also outputs the initial value of the current peak value Ip, and the diagnostic device 20i also outputs a diagnostic signal for Ip. The calculating means 30i has a pulse control logic circuit that controls the change of the pulse width and the current peak value Ip of the pulse based on the result of the diagnosis. The pulse generating means 40 for continuously generating pulses for electric machining is the same as that shown in FIG.

The pulse generator 2i receives an address, data, and a write enable from the CPU 1i similar to the CPU 1, and specific examples of the address and the data are shown in FIGS. 3 and 12. FIGS. 12 (1), (2) and (3) are diagrams showing examples of program data added by controlling the current peak value Ip.

When receiving the write enable signal, the storage means 10i includes a number of registers for storing on-time initial value data, off-time initial value data, an initial value of the current peak value Ip, and program data received from the CPU 1i. It is composed of The diagnostic device 20i includes a detection information selection unit 21i, a threshold setting unit 22i, a check pulse generation unit 23i, a detection stop signal generation unit 24, and a determination unit 25i.

The detection information selecting means 21i is a means for selecting one of a plurality of pieces of detection information input from outside the pulse generator 2i, and a specific example thereof is shown in FIG. 13 (1).

The threshold value setting means 22i sets a threshold value (detection reference value) for the selected detection information, outputs an evaluation signal that regards a case where the detection information is equal to or more than the threshold value as good (or bad), and outputs the evaluation signal. Processing (or not processing) when the detected information is greater than or equal to the set threshold
Means for outputting a machining start evaluation signal, a specific example of which is shown in FIG. 13 (1).

The check pulse generating means 23i is a means for controlling the timing from the rise of the machining start evaluation signal (or the rise of the gate signal) to the position where the ON check pulse and the OFF check pulse are generated. Means for generating an on-check pulse, an off-check pulse, and an Ip control check pulse for determining whether to detect the position, a specific example of which is shown in FIG. 13 (2).

The determination unit 25i is a unit that generates a diagnostic signal indicating a diagnosis result of the machining state based on the evaluation signal, the check pulse, and the detection stop signal for each of the ON time and the OFF time.

In the above embodiment, the detection information selected by the detection information selection means 21i, the threshold set by the threshold setting means 22i, the generation timing of the check pulse set by the check pulse generation means 23i, the determination means 25i
, The on-time length information output by the calculating means 30i, the off-time length information, the current peak value
All of the magnitude information of Ip is programmable.

In FIG. 12 (1), of the program data,
The data corresponding to the address 40 _HEX is the initial value of the current peak value Ip, and this initial value is defined by 12 bits. Other program data includes whether or not the current peak value Ip is controlled, and the increase width of the current peak value Ip. , A decrease width, an upper limit value, a lower limit value, and data for setting the presence or absence of control. For example, the address
The data corresponding to 42 _HEX is the increment of the current peak value Ip, and the increment is defined by 16 bits. Address 76
_The 1-bit data corresponding to _HEX is data for setting whether or not to perform the current peak value Ip control. When the bit is set to “0”, the current peak value Ip control is set, and the bit is set. When set to “1”, the current peak value Ip control is set not to be executed. The other program data is set in the same manner as described above.

FIGS. 12 (2) and (3) show the CPU 1 in the above embodiment.
9 is a chart showing an example of program data transferred from i to the diagnostic device 20i via the storage means 10i.

The program data shown in Fig. 12 (2)
In Ip control, control mode selection, F signal continuation number setting, B signal continuation number setting, sampling number setting in reference value judgment mode, F signal reference value setting, B signal reference value setting, judgment in increase control It is composed of setting of a mode, setting of a judgment mode in reduction control, setting of a judgment mode in reset control, and setting of a check pulse position. The settings shown in FIG. 12 (2) are basically the same as the settings shown in FIG. 3 (3).

The program data shown in Fig. 12 (3)
In Ip control, this is data for setting a threshold, selection of detection information, and evaluation at a level higher than the threshold. The settings shown in FIG. 12 (3) are basically the same as the settings shown in FIG. 3 (4).

FIG. 13 (1) is a circuit diagram showing an example of the detection information selecting means 21i and the threshold setting means 22i in the embodiment which also controls the current peak value Ip.

The detection information selection means 21i is obtained by adding a selector 21c to the detection information selection means 21.
According to the data (select signal) corresponding to the address BE _HEX in the program data shown in FIG.
It selects and outputs detection information of port A or detection information of port B for Ip control. Port A and port B are input terminals for outputting detection information indicating a processing state.

i threshold value setting means 22i includes a comparator 22e,
22f, and the comparator 22e is provided with the detection information from the detection information selection means 21i (in the case of the above embodiment, the gap current) and the threshold for controlling the current peak value Ip (address B2 _HEX
, And outputs “1” when the value of the detection information is larger than the threshold value. The selector 22f outputs the data (current peak value Ip control) corresponding to the address 8C _HEX . Data that determines the evaluation of the inter-electrode current that is greater than or equal to the threshold)
When the value is equal to or larger than the threshold value for Ip control, an evaluation signal “1” regarded as good or an evaluation signal “0” regarded as defective is output.

FIG. 13 (2) is a circuit diagram showing an example of the check pulse generating means 23i in the embodiment which also controls the current peak value Ip.

The check pulse generator 23i is obtained by adding a counter 23f and a comparator 23g to the check pulse generator 23.

The comparator 23g outputs an Ip control check pulse when the count value of the counter 23f matches the Ip control check pulse position data (data corresponding to the address 5C _HEX ).

The determining means 25i is composed of an on-time control determining means 50, an off-time control determining means 60, and an Ip control determining means (not shown). It has the same circuit configuration as the means 50. The operation circuit 30i includes an on-time operation circuit 70, an off-time operation circuit 80, and a current peak value Ip operation circuit (not shown). The current peak value Ip operation circuit is the same as the on-time operation circuit 70. Circuit configuration.

FIG. 13 (3) is a diagram showing an example of a switching circuit that forms a discharge pulse based on the pulse waveform output from the pulse generator 2i and the height information of Ip.

That is, this circuit includes a decoder D for decoding the height information of Ip, one of the Ip1 signal, Ip2 signal, Ip3 signal,... Multiple AND circuits for inputting signals and each AND
A transistor which is turned on by an output signal of the circuit and a resistor connected to a collector of the transistor are provided. A series circuit composed of one of the transistors and one resistor is connected in parallel with each other, and these series circuits are connected in series to a discharge loop. The value of the resistor is determined according to the corresponding Ip1 to Ipn signals,
Regulate the value of Ip.

Next, an embodiment in which the current peak value Ip is also controlled (FIGS. 11 to
The operation of the embodiment shown in FIG. 13) will be described.

The operation of this embodiment is basically the same as the operation of the flowchart shown in FIG. However, S50 in FIG.
5 is different from FIG. 5 in that the size information of Ip is also sent to the pulse generating means 40 in addition to the length information of the ON time or the length information of the OFF time, and according to this difference, in S60,
The pulse generation means 40 outputs a pulse based on the length information of the ON time and the length information of the OFF time, and the switching circuit shown in FIG. 13 (3) controls the magnitude of Ip.

FIG. 8 shows an example of controlling the ON time.
The same control is performed in the embodiment in which the current peak value Ip is also controlled.

Claims (2)

(57) [Claims] 1. A method for generating a series of pulse trains in which an ON time and an OFF time for performing electric machining are alternately repeated, wherein a control device having a CPU includes an initial value of an ON time and an initial value of an OFF time. And a storage device for storing a plurality of sets of program data relating to pulse generation conditions including values, and when a set of machining information relating to electric machining to be executed is input to the control device, the CPU executes processing of the plurality of sets of program data. From among them, a set of program data is arithmetically selected and supplied to a pulse generator. The pulse generator includes a storage unit capable of writing and storing a set of program data supplied from the controller. , The stored one
A large-scale integrated circuit having a logic circuit unit that performs a logical operation based on a set of program data to generate a pulse train that alternately repeats an on-time and an off-time, and the logic circuit unit evaluates a generated pulse. A diagnostic device for supplying program data for diagnosis from the storage unit, evaluating and diagnosing processing detection information on a processing state from the electric processing unit supplied with the generated processing pulse, and outputting a diagnostic signal; On-time and off-time calculating means for calculating each length information of on-time and off-time based on generation of pulse supplied from the means, program data on supply and a diagnostic signal from the diagnostic device; Pulse generation means for supplying each length information of the operation ON time and the OFF time and outputting a pulse waveform signal to the electric machining section; At this time, when one set of processing information is input to the control device having the CPU and the selected one set of program data is set to be supplied to the storage means of the pulse generator, the pulse generator is supplied with the supplied ON time. A pulse waveform signal is generated by the pulse generation means based on the data of the initial value and the initial value of the off time, the electric machining is performed in the electric machining unit, and machining detection information on the machining state is detected from the executed electric machining unit. Then, the diagnosis device evaluates and diagnoses the processing detection information based on the program data in the diagnosis device, and outputs a diagnosis signal. A function to calculate and output the length information of the ON time and the OFF time based on the diagnostic signal and output the pulse waveform signal to the pulse generation means. Pulse generating method for causing repeated. 2. A method for generating a series of pulse trains in which an on-time and an off-time for performing electric machining are alternately repeated, wherein the control device having a CPU includes an on-time initial value and an off-time initial value. And a storage device for storing a plurality of sets of program data relating to pulse generation conditions including values, and when a set of machining information relating to electric machining to be executed is input to the control device, the CPU executes processing of the plurality of sets of program data. From among them, a set of program data is arithmetically selected and supplied to a pulse generator. The pulse generator includes a storage unit capable of writing and storing a set of program data supplied from the controller. , The stored one
A large-scale integrated circuit having a logic circuit section that performs a logical operation based on a set of program data to generate a pulse train that alternately repeats an on-time and an off-time, and the logic circuit section evaluates a pulse generation. A diagnostic device for supplying program data for diagnosis from the storage unit, evaluating and diagnosing processing detection information on a processing state from the electric processing unit supplied with the generated processing pulse, and outputting a diagnostic signal; On-time and off-time calculating means for calculating each length information of on-time and off-time based on generation of pulse supplied from the means, program data on supply and a diagnostic signal from the diagnostic device; Each of the length information of the operation ON time and the OFF time is supplied, and a pulse generating means for outputting a pulse waveform signal to the electric machining unit is provided. The diagnostic device is a unit that determines the processing detection information based on a threshold set according to the program data and outputs an evaluation signal.After a voltage pulse is applied to the electric processing unit by a generation output of a pulse waveform signal, Detection stopping means for prohibiting the determination of the evaluation signal for a set predetermined period,
A check pulse generating means for discriminating and outputting the evaluation signal after a lapse of a discrimination prohibition period by the detection stopping means, each time a voltage pulse is applied to the electric machining section, a check pulse is generated and output; On-time and off-time for outputting the increase / decrease command signal of the on-time and off-time to the on-time and off-time calculating means by logically discriminating the failure determination signal by the occurrence state / frequency logic circuit set according to the program data A pulse generator comprising: a control discriminator.