WO2011151905A1 - Electrodischarge machining apparatus - Google Patents

Abstract

Disclosed is an electrodischarge machining apparatus provided with a machining tank wherein an article being machined is displaced, a machining unit equipped with electrodes which electrodischarge-machine the article being machined, a power supply unit which supplies power between the electrodes and the article being machined, and a control unit (13) which performs drive control of the machining unit and the machining tank in accordance with a machining program. This electrodischarge machining apparatus is further provided with a machining time estimation unit (15) comprising a machining program dividing unit (24) whereby a machining condition column consisting of a plurality of machining conditions that are input are divided into swing-wise machining programs and machining-wise machining programs; a machining data detection unit (21) which detects the number of machining pulses and a machining position, in a machining operation performed under predetermined machining conditions; a machining amount calculation unit (22) which calculates the machined area during swing-wise machining and a machined area during machining-wise machining, on the basis of the number of pulses and the machining position detected by the machining data detection unit (21); and a machining time computing unit (23) whereby machining times under machining conditions subsequent to the predetermined machining conditions are calculated on the basis of the machining condition column and the results of calculations made by the machining amount calculation unit (22).

Description

EDM machine

The present invention relates to an electric discharge machining apparatus having a machining time estimation function for accurately outputting a machining end time at the end of the first condition of finishing machining at the latest when machining is performed using a machining condition sequence including a plurality of machining conditions. It is.

In the conventional sculpture electric discharge machining, when the machining time is estimated, it is basically calculated by the following formula.

Processing time = amount processed / amount processed per unit time

If an accurate machining amount can be obtained from this equation, an accurate machining time can be estimated. However, the processed shape of the workpiece to be actually subjected to the sculpture electric discharge machining has a complicated shape. For this reason, most of the work for estimating the machining time has to rely on the intuition and experience of the operator, except for the machining of a very simple shape such as a cylinder or a square pole for a solid workpiece.

In order to estimate the machining time with a high degree of accuracy by reducing the ratio depending on the intuition and experience of such workers, the shape of the electrode, the shape of the workpiece, the shape of the workpiece, There is an electric discharge machining apparatus that includes a machining simulation by inputting a machining depth.

In this electric discharge machining apparatus, the electrodes are applied to the workpiece at predetermined intervals until reaching the inputted machining depth based on the inputted electrode shape, workpiece shape and workpiece machining depth. Machining information regarding the machining shape at each machining depth when moved is calculated.

At the same time, a simulation unit that sets the shape obtained by subtracting the machining shape from the shape of the workpiece as the new workpiece shape at each machining depth, the machining depth at each machining depth, and the corresponding machining information And a machining simulation device having an output unit for outputting the machining information string to be included.

In the above electric discharge machining apparatus, the machining area and machining volume are calculated from machining simulation to estimate machining time with high accuracy by reducing the ratio depending on intuition and experience (for example, see Patent Document 1).

Moreover, in the conventional automatic machining condition control device for electric discharge machining, a technique for calculating a value corresponding to the machining area from the relative speed between the workpiece and the electrode at the time of machining and the effective discharge rate / current efficiency is disclosed ( For example, see Patent Document 2.)

JP 2003-340652 A Japanese Patent Laid-Open No. 03-270821

However, according to the technique of the above-mentioned Patent Document 1, in calculating the machining area and the machining volume, before performing electric discharge machining, the shape of the electrode, the shape of the workpiece, and the machining depth of the workpiece are accurately determined. In particular, in order to prepare the shape of the workpiece, it is necessary to simulate all the various processes performed before electric discharge machining.

Therefore, it is necessary to prepare machining simulation software to be performed before electric discharge machining in order to input shape information, and much cost is required to estimate the machining time of electric discharge machining.

Moreover, according to the technique of the above-mentioned Patent Document 2, since the value corresponding to the machining area is calculated from the relative speed between the workpiece and the electrode during machining, the effective discharge rate, and the electrode efficiency, the projected area in the machining direction is calculated. Although it is possible to calculate, a value corresponding to the machining area at the time of rocking machining cannot be calculated.

The present invention has been made in view of the above, and in electric discharge machining using a machining condition sequence composed of a plurality of machining conditions, any electrode or workpiece can be used at the latest without input of shape information. An object of the present invention is to obtain an electric discharge machining apparatus capable of calculating a machining area with high accuracy after completion of the first condition of finishing machining and calculating and displaying a machining finishing time with high accuracy based on the calculated machining area. To do.

In order to solve the above-described problems and achieve the object, the present invention provides a processing tank in which a workpiece is disposed, a processing unit including an electrode for performing electric discharge machining of the workpiece, the electrode, and the processing target. In an electric discharge machining apparatus including a power supply unit that supplies electric power to an object and a control unit that performs drive control of the machining unit and the machining tank according to a machining program, a machining condition sequence including a plurality of inputted machining conditions Machining program dividing unit that divides the machining program into a machining program in the swing direction and a machining program in the machining direction, a machining data detection unit that detects the number of machining pulses and a machining position during machining under predetermined machining conditions, and the machining data detection unit A machining amount calculation unit that calculates a machining area at the time of machining in a swing direction and a machining area at the time of machining direction machining based on the number of machining pulses detected by the step and the machining position; Based on the serial processing amount calculating section of the calculation result, characterized in that the machining time estimating unit further comprises having a processing time calculation unit for calculating a machining time at the processing conditions of the next subsequent of said predetermined machining conditions.

According to the present invention, in an electric discharge machining using a machining condition sequence composed of a plurality of machining conditions, a high-precision machining area can be obtained at the latest after the completion of the first condition of finishing machining, regardless of the type of electrode or workpiece. There is an effect that it is possible to display the machining end time with high accuracy from the calculated machining area.

FIG. 1 is a diagram showing a configuration of an electric discharge machining apparatus according to an embodiment of the present invention. FIG. 2 is a block diagram illustrating a configuration of a machining time estimation unit of the electric discharge machining apparatus according to the first embodiment. FIG. 3 is a flowchart illustrating processing of the machining time estimation unit of the electric discharge machining apparatus according to the first embodiment. FIG. 4 is a diagram showing a table showing the contents of the machining condition sequence according to the embodiment of the present invention. FIG. 5A is a schematic diagram in which the processed surface after the roughing when the workpiece W is processed by the electrode T is W1, and the processed surface after the first row of finishing conditions is W2. FIG. 5B is an enlarged view of a region indicated by R in FIG. FIG. 6 is a diagram showing a table showing the contents of the machining amount data part. FIG. 7 is a diagram showing a table of estimated machining times displayed and output on the display unit. FIG. 8 is a block diagram illustrating a configuration of a machining time estimation unit of the electric discharge machining apparatus according to the second embodiment. FIG. 9 is a flowchart illustrating processing of the machining time estimation unit of the electric discharge machining apparatus according to the second embodiment. FIG. 10 is a diagram showing a table showing the contents of the correction coefficient data part. FIG. 11A is a graph in which correction coefficient data is displayed in time series when an abnormality that causes the machining time to be longer than the estimated time is shown. FIG. 11B is a graph in which correction coefficient data is displayed in time series in the case where an abnormality is indicated in which the machining time is shorter than the estimated time. FIG. 12 is a block diagram illustrating a configuration of a machining time estimation unit of the electric discharge machining apparatus according to the third embodiment. FIG. 13 is a flowchart illustrating processing of the machining time estimation unit of the electric discharge machining apparatus according to the third embodiment. FIG. 14 is a diagram illustrating an example in which the display unit displays the pass / fail determination result of each processing condition. FIG. 15 is a block diagram of another configuration of the machining time estimation unit of the electric discharge machining apparatus according to the third embodiment. FIG. 16 is a flowchart illustrating another process of the machining time estimation unit of the electric discharge machining apparatus according to the third embodiment.

Hereinafter, embodiments of an electric discharge machining apparatus according to the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment 1 FIG.
FIG. 1 is a block diagram illustrating a configuration of an electric discharge machining apparatus 1 according to the first embodiment. The electric discharge machining apparatus 1 includes a machining tank 16 in which a workpiece 17 is immersed in a machining liquid 18, a machining unit 11 having a tool electrode arranged to face the workpiece 17, a tool electrode, The power supply unit 12 that supplies power to the workpiece 17, the machining time estimation unit 15 in the electric discharge machining of the workpiece 17, and the machining unit 11 using the machining time estimation result in the machining time estimation unit 15 A numerical control unit 13 that drives and controls a motor (not shown) attached to the processing tank 16, a processing time estimation unit 15, and a display unit 14 connected to the control unit 13 are provided.

FIG. 2 is a block diagram illustrating a configuration of the machining time estimation unit 15 included in the electric discharge machining apparatus 1 according to the first embodiment.

The machining time estimation unit 15 includes an input unit 25 to which a machining condition sequence is input by a user, and a machining data detection unit 21 that detects the number of machining pulses being processed, a rocking direction machining position, a machining direction machining position, and the like from the control unit 13. Based on the machining program dividing unit 24 that divides the machining program into the oscillation direction and the machining direction from the machining condition sequence via the input unit 25, and the machining data and input detected by the machining data detection unit 21, the oscillation direction Machining at the time of machining in the rocking direction from the amount of machining in the actual machining and the number of machining pulses generated until the machining in the oscillating direction is completed, and the number of machining pulses in the machining direction and the number of machining pulses generated until the machining is completed Machining amount calculation unit 22 for calculating the machining amount and machining amount at the machining direction machining, and calculating the machining area at the time of swing direction machining and the machining area at the time of machining direction progress during machining In addition, a machining time calculation unit 23 that calculates the machining time of the next and subsequent machining condition sequences, and an output that receives and outputs the machining program created by the machining program dividing unit 24 and the estimated machining time calculated by the machining time calculation unit 23. Part 26.

The machining end time calculated by the machining time calculation unit 23 is displayed on the display unit 14 connected to the output unit 26. The output unit 26 is also connected to the control unit 13. The processing time estimation unit 15 is realized by, for example, a personal computer having an image processing function.

The operation processing procedure of the electric discharge machining apparatus 1 having such a configuration will be described with reference to the flowchart of FIG. First, the user inputs a machining condition sequence from the machining condition input unit 25 based on specifications required for the workpiece 17.

The machining condition column input here is composed of a plurality of machining condition columns from rough machining conditions to finishing machining conditions as shown in the table of FIG. 4, and one condition of each machining condition column unless otherwise specified. Treat eyes as roughing. In each machining condition column, information such as machining circuit, power supply control conditions such as pulse width, discharge gap, machining speed, target machining direction position and oscillation amount are registered.

First, after starting the machining in step S11, it is determined in step S12 whether or not the rough machining of the machining condition row is completed. If step S12 is affirmed, the process proceeds to step 13. If it is denied, step S11 is repeated until it is affirmed.

In step S13, in the machining of the next machining condition sequence after the end of the rough machining, in order to calculate the machining area more accurately, it is divided into a program for machining the amount of movement in the swing direction and a program for machining the amount of movement in the machining direction. To do. For example, when the amount of shift from the rough machining condition end position in the first finish machining condition is 100 μm in the rocking direction and 200 μm in the machining direction, a machining program for machining 100 μm in the rocking direction and machining for 200 μm machining in the machining direction. Divide into programs.

Next, proceeding to step S14, a machining program for machining the amount of shift in the swing direction is executed. That is, in step S14, machining in the swing machining direction in the first row of finishing machining conditions is started. In step S15, the machining data detection unit 21 detects the machining position in the swing direction and the number of machining pulses.

The machining amount calculation unit 22 reaches the actual advance amount D1 and the actual advance amount D1 in the swing direction until the command value in the swing direction is reached from the swing radius in which the actual machining starts in the swing direction until the processing value is finished. Then, the number of machining pulses at the time of calculating the actual advance amount detected between the end of the oscillating machining and the end of the rocking machining is calculated.

The following is a detailed description of the method of calculating the actual advance amount in the swing direction and the number of machining pulses when calculating the actual advance amount. FIG. 5A is a schematic diagram in which the processed surface after the roughing process when the workpiece (work) W is processed by the electrode T is W1, and the processed surface after finishing the first row of finishing conditions is W2. It is.

Fig. 5-2 is an enlarged view of the region indicated by R in Fig. 5-1. G1 is a discharge gap at the time of rough machining, G2 is a discharge gap at the time of finishing machining in the first row, Y1 is a swing amount command position at the time of rough machining, Y2 is a swing amount command position at the time of finishing machining condition, Y3 is a swing command position where discharge is actually started at the time of finishing the first row machining condition, and D1 is an actual advance amount in the swing direction.

Finishing machining conditions Since the discharge gap in the first row is smaller than that in rough machining, the discharge starts after reaching Y3 in the finishing first row machining. The Y3 position is determined by the following method, for example. Y3 is the largest amount of rocking when the rocking is circulated only once so as to always discharge during rocking machining. The number of machining pulses at the time of calculating the actual advance amount is obtained by counting and integrating the number of pulses discharged when the oscillation amount is Y3 or more. Instead of the machining pulse, an average voltage during actual machining, a time during which the machining pulse is generated, or the like can be used.

Further, whether or not the machining has been completed in the swing direction is determined to be that the machining has been completed when the discharge pulse is not generated after the position command reaches the swing radius. When the processing is completed, the process proceeds to step 16.

Next, in step 16, the machining amount calculation unit 22 calculates a machining area at the time of machining in the swing direction by the following formula. The actual advance amount in the swing direction is the difference between the command swing radius reached in step 15 and the swing command position Y3 where discharge is actually started at the time of finishing the first row machining condition stored in step 14.

Machining area when machining in the swing direction =
(Number of machining pulses when calculating the actual advance amount calculated above * Machining amount per pulse) / Actual advance amount in the oscillation direction

The machining amount calculation unit 22 calculates the actual machining amount in the oscillating direction after the second row of finishing machining conditions from the calculated machining area and machining condition row at the time of the oscillating machining by the following formula.

Finishing conditions Actual machining amount in the swing direction after the second row =
Alignment amount of the machining condition sequence-(discharge gap of the previous row-discharge gap of the condition row) x machining area when machining in the calculated swing direction

The machining amount calculation unit 22 calculates the oscillating machining volume for each machining condition row, stores it in the machining amount data unit 27, and proceeds to the next step S17.

Next, in step S17, a machining program for machining the amount of shift in the machining direction is started. In step S18, the machining data detection unit 21 detects the machining position machining position and the number of machining pulses. The machining amount calculation unit 22 calculates the amount of advance in the machining direction and the total number of machining pulses detected during machining in the machining direction until the machining direction command value is reached from the machining position where machining is actually started in the machining direction and machining is completed. To do.

When the machining in the machining direction is completed, in step S19, the machining amount calculating unit 22 determines the actual advance amount in the machining direction, the number of machining pulses at the time of calculating the actual advance amount detected during the machining direction, and the number of pulses in the machining condition sequence. The machining area at the time of machining in the machining direction is calculated from the machining amount by the following formula. The method of calculating the actual advance amount in the machining direction and the number of machining pulses at the time of calculating the actual advance amount is the same as that in the oscillation direction machining, and detailed description thereof is omitted.

Machining area when machining direction =
(Number of machining pulses when calculating the calculated actual advance amount * amount of machining per pulse) / advance amount in the machining direction

The machining amount calculation unit 22 calculates the actual machining amount in the machining direction in the second and subsequent columns of the finishing machining conditions from the calculated machining area and machining condition column at the time of machining in the above-described machining direction by the following formula.

Finishing conditions Actual machining amount in the machining direction after the second row =
Shift amount of the machining condition sequence-(discharge gap of the previous row-discharge gap of the condition row) x machining area when machining in the calculated machining direction

The machining amount calculation unit 22 calculates a machining volume in the machining direction for each machining condition row, stores the machining volume in the machining amount data unit 27, and proceeds to the next step S20.

Next, in step S20, the machining time calculation unit 23 uses the machining speed of each machining condition sequence shown in the machining condition sequence of FIG. 4 and the machining volume stored in the machining amount data unit 27 shown in FIG. Thus, the estimated machining time (predicted machining time) in each machining condition row is calculated.

In other words, the machining time estimation unit 15 divides the machining volume for each machining condition sequence that constitutes the machining volume sequence by the machining amount per unit machining time stored in the machining condition sequence. Calculate the estimated processing time. The calculated machining time is stored in the machining time data unit 28. The processing time data is displayed and output on the display unit 14 as shown in FIG.

According to the first embodiment, since the machining area is calculated separately for the rocking direction and the machining direction, even if the gap or the amount of shift between the rocking direction and the machining direction is different, it does not depend on the shape of the electrode or workpiece. The machining area can be calculated with high accuracy. In the above description, the amount of shift is described as 300 μm. However, the value is not limited to this value, and other values may be used.

Embodiment 2. FIG.
Also in the present embodiment, the block diagram showing the configuration of the electric discharge machining apparatus 1 is the same as FIG. FIG. 8 is a block diagram illustrating a configuration of the machining time estimation unit 15 included in the electric discharge machining apparatus 1 according to the second embodiment.

In the configuration shown in FIG. 2 of the first embodiment described above, the machining time estimation unit 15 is the actual machining time and the machining time that is the time taken for the actual machining input by the control unit 13 via the input unit 25. A correction coefficient calculation unit (processing time correction unit) 31 that calculates a correction coefficient for the estimated machining time by using a difference from the machining time estimated by the time calculation unit 23, and a correction coefficient data unit 32 that stores the correction coefficient. Is further provided. Note that the same components as those described in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

The operation processing procedure of the electric discharge machining apparatus 1 including the machining time estimation unit 15 having such a configuration will be described with reference to the flowchart of FIG.

First, steps S11 to S20 are the same as those in FIG.

Next, in step S21, the estimated processing after correction is performed by multiplying the estimated processing time (predicted processing time) calculated in step S20 in the processing time correction unit 31 by the correction coefficient appropriately selected from the correction coefficient data unit 32. Create time.

Next, in step S22, the actual machining time after completion of machining is input to the machining time correction unit 31 via the input unit 25.

Then, in step S23, the machining time correction unit 31 calculates a value obtained by dividing the difference between the actual machining time in each machining condition sequence and the estimated machining time before correction calculated in step S20 by the actual machining time (this correction data ( Correction coefficient).

The correction data is stored in the correction coefficient data section 32 for each combination of electrode material, workpiece material, processing area, processing current and pulse width as shown in FIG. The correction coefficient data unit 32 stores a history of correction data for a plurality of past times. For example, the past 10 correction coefficients are stored, and the average of 11 correction coefficients together with the correction coefficient calculated this time is stored in the correction coefficient data section 32 as correction coefficient data that is actually multiplied by the estimated processing time. To do.

Also, a display unit capable of displaying the correction coefficient change history in time series as shown in FIGS. 11A and 11B may be provided.

According to the second embodiment, since the machining time correction unit 31 for correcting the estimated machining time is added to the machining time estimation function as shown in FIG. Since the difference is automatically corrected, the more accurate machining time can be calculated as the same machining is performed.

Also, by displaying the correction coefficient history in chronological order, changes in the machining speed can be observed over the long term. For example, FIG. 11A is a graph in which correction coefficient data is displayed in time series in the case where an abnormality in which the machining time is longer than the estimated time is shown.

If the value of the correction coefficient suddenly increases at the time of operation years Ta as shown in FIG. 11-1, some factors that cause a failure in the machining power source or reduce the machining speed at the time of operation years Ta occur. It is possible that

Also, FIG. 11-2 is a graph showing correction coefficient data in time series in the case of showing an abnormality in which the machining time is shorter than the estimated time. When the value of the correction coefficient becomes small, it is conceivable that the amount of shift is not optimal due to the increase of the discharge gap due to deterioration of the machining fluid.

In the above description, the correction coefficient is classified into a combination of machining material, machining area, machining current and pulse width, and the correction coefficient calculation method is calculated by the past 11 moving average processes.

However, the method of obtaining the correction coefficient is not limited to the above-mentioned classification and calculation method of processing forms, but the person in charge of processing regardless of the classification method and processing conditions, the classification of products, the electrodes and workpieces to be processed The correction coefficient may be input from the outside, taking into account the conditions such as the supplier of the goods or using standard deviation as an index of the correction coefficient calculation method.

In the above embodiment, the correction coefficient calculation unit that calculates the correction coefficient for the estimated machining time and the machining time correction unit that multiplies the estimated machining time by the correction coefficient are the same, but each is provided separately. It doesn't matter.

Embodiment 3 FIG.
Also in the present embodiment, the block diagram showing the configuration of the electric discharge machining apparatus 1 is the same as FIG. FIG. 12 is a block diagram illustrating a configuration of the machining time estimation unit 15 included in the electric discharge machining apparatus 1 according to the third embodiment.

In the configuration shown in FIG. 8 of the second embodiment described above, the machining time estimation unit 15 uses a ratio between the actual machining time and the estimated machining time, and determines whether the machining is good or bad. The configuration further includes a pass / fail judgment data unit 42 that holds the judgment upper limit value and the pass / fail judgment lower limit value. Note that the same components as those described in the second embodiment are denoted by the same reference numerals and description thereof is omitted.

The operation processing procedure of the electric discharge machining apparatus 1 including the machining time estimation unit 15 having such a configuration will be described with reference to the flowchart of FIG.

Processing from step S11 at the start of machining to step S22 at which the actual machining time after the end of machining is input is the same procedure as in the second embodiment, and thus description thereof is omitted.

Next, in step S31, based on whether or not the difference between the calculated machining time and the actual machining time is within a predetermined range in machining under the machining conditions in the machining condition column N. The quality of machining is judged.

Specifically, the value obtained by dividing the actual machining time by the estimated machining time before correction by the machining time correction unit 31 is within the range of the pass / fail judgment upper limit value and the pass / fail judgment lower limit value set in the pass / fail judgment data unit 42 in advance. The processing quality determination unit 41 determines whether there is any. When step S31 is executed for the first time, N = 3.

If the value divided above is equal to or higher than the upper limit value for pass / fail judgment, it is determined that the machining is abnormal because it takes too much time. Further, when it is equal to or lower than the pass / fail judgment lower limit value, it is determined that the machining is abnormal because it does not take much time. These determination results are displayed on the display unit 14.

Next, in step S32, it is determined whether or not the machining result under the machining conditions in the Nth row is good. If step S32 is affirmed, the process proceeds to S23, and after calculating the correction coefficient, the process proceeds to S33. If negative, the process proceeds to step S33 without executing S23.

Next, in step S33, it is determined whether or not the Nth column is the final processing condition column. If step S33 is positive, the process proceeds to step S34. If not, N = N + 1 is set and the process proceeds to S31. When the process proceeds to step S34, the quality determination result of each processing condition is displayed as shown in FIG.

According to the third embodiment, the machining time estimation unit 15 is further configured to include the machining quality determination unit 41 that determines the quality of machining using the ratio between the actual machining time and the estimated machining time. The quality of the machining result can be determined for each row.

Furthermore, the user can know whether machining time is too long or too little in each machining condition column. For example, when it is determined that the machining time is excessively long, it is considered that the machining current density is inappropriate with respect to the machining area, and the machining conditions can be corrected such as extending the downtime.

Also, if it is determined that the machining time is too short, it is possible that the discharge gap is increased due to inappropriate sludge discharge conditions, and jump conditions can be corrected. Moreover, it is possible to calculate a highly accurate correction coefficient by excluding the machining result determined to be abnormal from the process of calculating the correction coefficient.

Further, as shown in FIG. 15, a configuration in which the processing time correction unit 31 and the correction coefficient data unit 32 are removed from FIG. 12, that is, a configuration in which a processing quality determination unit 41 and a quality determination data unit 42 are added to FIG. The quality of the machining result can be determined.

In this case, by using the ratio between the actual machining time input to the machining quality determination unit 41 via the input unit 25 and the machining time estimated by the machining time calculation unit 23, the machining quality determination unit 41 performs processing for each machining condition sequence. In addition, the quality of the machining result can be judged.

FIG. 16 shows a flowchart in this case. The process from step S11 at the start of machining to step S20 for calculating the estimated machining time (predicted machining time) is the same procedure as in FIG. In step S22 following step S20, the actual machining time after the machining is input to the machining quality determination unit 41 via the input unit 25.

Next, in step S31, whether or not the difference between the estimated machining time calculated by the machining time calculating unit 23 and the actual machining time is within a predetermined range in machining under the machining conditions in the Nth machining condition column. The quality of the machining is determined based on whether or not.

Specifically, the machining quality determination unit 41 determines whether the value obtained by dividing the actual machining time by the estimated machining time is within the range of the quality determination upper limit value and the quality determination lower limit value set in the quality determination data unit 42. . When step S31 is executed for the first time, N = 3. Steps S33 and S34 are the same as those in FIG.

As described above, even in the configuration of FIG. 15 in which the predicted machining time is not corrected, it is possible to determine whether or not the machining is abnormal, so that the machining conditions as described above can be corrected.

As described above, in the embodiment of the present invention, even if there is no three-dimensional model, the electric discharge machining area can be accurately calculated at the end of rough machining. As a result, the user only needs to input the machining conditions and perform a normal operation for machining, and the more the machining machine is used, the more accurately the machining end time can be estimated.

Furthermore, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention in the implementation stage. Further, the above embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent requirements. For example, even if some constituent elements are deleted from all the constituent elements shown in the embodiment, the problem described in the column of the problem to be solved by the invention can be solved, and is described in the column of the effect of the invention. When an effect is obtained, a configuration in which this configuration requirement is deleted can be extracted as an invention. Furthermore, the constituent elements over different embodiments may be appropriately combined.

As described above, the electric discharge machining apparatus according to the present invention is useful when there is no three-dimensional model, and particularly in machining that has a short rough machining time and a long finishing machining time, such as electric discharge machining of a workpiece model after cutting. It is effective when estimating the machining time of the whole electric discharge machining process.

DESCRIPTION OF SYMBOLS 1 Electrical discharge machining apparatus 11 Processing part which has tool electrode 12 Power supply part 13 Control part 14 Display part 15 Processing time estimation part 16 Processing tank 17 Workpiece 18 Processing liquid 21 Processing data detection part 22 Processing amount calculation part 23 Processing time calculation part 24 machining program dividing unit 25 input unit 26 output unit 27 machining amount data unit 28 machining time data unit 31 machining time correction unit 32 correction coefficient data unit 41 machining quality determination unit 42 quality determination data unit S11 to S23, S31 to S34 Step T Electrode W Work W1 Machining surface after finishing rough machining W2 Machining surface after finishing 1st row G1 Discharge gap at rough machining G2 Discharge gap at 1st row machining in finishing machining condition Y1 Swing amount command at rough machining Position Y2 Fluctuation amount command position when finishing the first row of machining conditions Y3 Finishing machining conditions of the first row when machining Swing command position where discharge actually starts D1 Actual advance amount in swing direction

Claims (5)

A processing tank in which a workpiece is placed;
A machining unit comprising an electrode for performing electrical discharge machining of the workpiece;
A power supply for supplying power between the electrode and the workpiece;
In an electric discharge machining apparatus comprising a control unit that performs drive control of the machining unit and the machining tank according to a machining program,
A machining program dividing unit that divides a machining condition sequence including a plurality of inputted machining conditions into a machining program in a swing direction and a machining program in a machining direction;
A machining data detector that detects the number of machining pulses and the machining position during machining under predetermined machining conditions;
Based on the number of machining pulses detected by the machining data detection unit and the machining position, a machining amount calculation unit that calculates a machining area at the time of machining in a swing direction and a machining area at the time of machining direction machining,
A machining time estimation unit further comprising a machining time calculation unit that calculates a machining time under a machining condition subsequent to the predetermined machining condition based on the machining condition sequence and a calculation result of the machining amount calculation unit. Electrical discharge machining equipment characterized by The processing time estimation part is
A correction coefficient calculator that calculates a correction coefficient from the calculated machining time and actual machining time;
The electric discharge machining apparatus according to claim 1, further comprising a machining time correction unit that corrects the machining time using the correction coefficient. The processing time estimation part is
The electric discharge machining apparatus according to claim 1, further comprising a machining time correction unit that corrects the machining time using a correction coefficient input from the outside. The processing time estimation part is
The electric discharge machining apparatus according to claim 1, further comprising a machining quality determination unit that determines whether the difference between the calculated machining time and the actual machining time is within a predetermined range. The processing time estimation part is
The electric discharge machining apparatus according to claim 2, further comprising a display unit configured to display a time-series change of the calculated correction coefficient.

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