KR20080028761A - Processing Method of Printed Board and Printed Board Processing Machine - Google Patents

Abstract

Provided are a substrate processing method for a printed board and a printed circuit board machine capable of improving processing accuracy (depth of hole depth) even when the temperature of the spindle unit changes.

The relationship between the operating time of the spindle and the axial displacement amount δ of the tool tip held on the spindle is determined in advance for each revolution of the spindle, and based on the rotation speed of the spindle set for machining and the elapsed time after the start of machining, The cut depth of is corrected by the displacement amount δ obtained beforehand.

Description

Processing Method of Printed Board and Printed Board Processing Machine {MACHINING METHOD OF PRINTED CIRCUIT BOARDS AND PRINTED CIRCUIT BOARD MACHINING APPARATUS}

The present invention relates to a processing method of a printed board and a printed board processing machine using the same.

2 is a configuration diagram of a printed board processing machine.

In the figure, the table 3 supported to be moved along the linear guide device 2 fixed on the bed 1 is driven by the motor 4 via a screw feed mechanism. The column 5 is fixed to the bed 1 so that the table 3 can be turned over. The cross slide 7 supported to be movable along the linear guide device 6 fixed to the column 5 is driven by the motor 8 via a screw feed mechanism. The saddle 9 is supported to be movable by a linear guide device (not shown) fixed to the cross slide 7 and is driven by the motor 10 via a screw feed mechanism. The spindle unit 11, which holds an unillustrated tool and supports a non-illustrated spindle, is fixed to the saddle 9. The pressure foot 12 is supported at one end of the spindle unit 11 so as to be movable in the axial direction of the spindle. The pressure foot 12 is connected to the dust collecting device 14 through the dust collecting pipe 13. The cooling device 15 is connected to the spindle unit 11 through the pipe 16, and circulates the liquid refrigerant in the passage formed in the spindle unit 11 to cool the spindle unit 11.

Then, the spindle holding the required tool is rotated at the required rotational speed, and the dust collecting device 14 is operated to suck the pressure foot 12 inside through the pipe 13. In this state, the table 3 on which the workpiece W is placed and the cross slide 7 are relatively moved in the XY direction so that the saddle 9 is lowered after the tool is opposed to the machining position of the workpiece. . Then, the pressure foot 12 first contacts the work W to pressurize the work W. FIG. When the saddle 9 is further lowered, the spindle unit 11 and the pressure foot 12 move relative to each other, and the tool penetrates into the workpiece W to process the workpiece W.

Since the spindle unit 11 becomes hot due to the heat generated by the motor rotating the spindle, the cooler 15 is operated at a predetermined time interval (5 to 15 minutes) to circulate the refrigerant inside the spindle unit 11, The temperature of the spindle unit 11 is maintained within the required temperature range.

However, if the cooling device is operated when the drill change occurs frequently, as the spindle unit cools too much and falls outside the required temperature range, the machining position accuracy and the machining quality (for example, the surface roughness of the machined hole surface) may be reduced. There is a case. Thus, instead of installing a cooling device, a plurality of air flow passages are formed inside the housing supporting the spindle, and a flow regulator is disposed between the flow passages and the dust collector so that the main shaft rotates. When there is a flow rate, the flow rate of the air flowing in the flow passage is increased to prevent the temperature of the spindle unit from rising above the set temperature. When the rotation of the spindle stops, such as when exchanging a workpiece or changing a tool, There exists a technique of controlling the temperature of a spindle unit to a comparatively narrow range by reducing the flow volume of air and preventing overcooling of a spindle unit (patent document 1).

In addition, the cover of a printed board drilling machine (drilling machine) and cover the temperature controlled air sent to the inside of the cover, it is also possible to suppress the temperature change of the printed board drilling machine (Patent Document 2).

[Patent Document 1] Japanese Patent Laid-Open No. H7-328889

[Patent Document 2] Japanese Patent Application Laid-Open No. H6-023647

However, according to the technique of patent document 1, although the range of temperature change can be made small, since the temperature of a spindle unit does not change immediately even if air flow volume is controlled, it is not necessarily said that processing precision can be improved. Could not.

In addition, in the case of the technique of Patent Literature 2, similarly to the technique of Patent Literature 1, the temperature of the spindle unit does not change immediately, and thus it cannot be said that the processing accuracy can always be improved.

SUMMARY OF THE INVENTION An object of the present invention is to provide a processing method for a printed board and a printed board processing machine which can improve the processing accuracy (depth of hole depth) even when the temperature of the spindle unit changes.

MEANS TO SOLVE THE PROBLEM In order to solve the said subject, the 1st aspect of this invention calculates the relationship between the running time of a spindle and the amount of axial displacement of the tool tip hold | maintained at the said spindle in advance for every rotation speed of the said spindle, Based on the set number of revolutions of the spindle and the elapsed time after the start of machining, a cut depth of the tool is corrected by the displacement amount previously obtained.

Moreover, the 2nd aspect of this invention is a relationship between the operation time of the said spindle after a change and the axial displacement amount of the tool tip hold | maintained at the said spindle, when changing from the 1st rotation speed of a spindle to a 2nd rotation speed, It calculates in advance for every said 1st and 2nd rotation speed, and correct | amends the cutting amount of the said tool by the said displacement amount calculated | required based on the elapsed time after changing into the said 2nd rotation speed and said 2nd rotation speed, It is characterized by the above-mentioned. do.

Further, a third aspect of the present invention includes a spindle for rotating a tool and a moving device for moving the spindle in the axial direction of the tool, wherein the tool is moved in the axial direction of the tool by a distance based on a command value. A printed board processing machine for moving and processing, comprising: a storage device, arithmetic unit, and a timer in which the relationship between the operating time of the spindle and the amount of axial displacement of the tip of the tool held on the spindle is stored in advance for each revolution of the spindle; When the machining is started, the cutting amount of the tool is corrected by the displacement amount calculated in advance based on the rotation speed of the spindle set for the machining and the elapsed time after the start of the machining measured by the timer. It is done.

According to the present invention, since the cutting amount of the tool is properly corrected in accordance with the temperature rise of the spindle unit, the depth accuracy of the hole can be improved.

FIG. 1 is actual measurement data of the movement amount (hereinafter, referred to as "displacement amount") of the tool tip held on the spindle, and the horizontal axis represents time and the vertical axis represents displacement amount δ. On the other hand, the total length of the spindle unit is about 300mm, the cooling unit passage is provided inside the spindle unit. Moreover, displacement amount (delta) = 0 is a position of the tool tip in temperature 20 degreeC.

As shown in the figure, when the spindle is rotated at 200,000 revolutions per minute and a cooling medium of 17 ° C is supplied (time T0), immediately after the spindle unit contracts, the tip of the tool is displaced to the negative side. Within minutes, there is a positive side displacement. At the time T1 after about 5 minutes has elapsed, the amount of displacement is almost saturated.

Next, when decelerating at 30,000 revolutions / minute (time T2), as the brake current value larger than the normal current value is supplied, the temperature of the spindle unit rises and the displacement amount δ temporarily increases. As time passes, the displacement amount δ is saturated at time T4 (after about 8 minutes). In this case, since the cooling effect is large, it displaces to the negative side in the case where the temperature is 20 ° C.

On the other hand, when the spindle is stopped from time T0 to time T2 and the spindle is rotated at 30,000 revolutions / minute at time T2, the amount of displacement at the tip of the tool is as shown by the dashed-dotted line in the figure.

Here, the displacement amount δ of the tip of the tool is almost determined by the number of revolutions of the spindle and the operating time (elapsed time after the start of processing), and the deviation is small. Therefore, the relationship between the operating time of the spindle and the displacement amount δ of the tip of the tool is obtained in advance, and the cutting depth of the designated tool with reference to the rotational speed and the operating time of the tool used for machining at the time of machining. ) Is corrected by the displacement amount δ of the tip of the tool, which has been obtained in advance, and can be processed with excellent depth accuracy.

In addition, for example, when a tool is a drill, the use rotation speed is determined for every diameter. In other words, 16 to 200,000 revolutions / minute when the diameter is 0.3 mm or less, and 6 to 80,000 revolutions / minute and the like when the diameter is 0.4 mm to 1 mm or less. Therefore, it is not necessary to collect data for each drill diameter. .

By the way, in the case of a printed board puncher, most of them are operated continuously except when the life of the drill which is a tool runs out, or when replacing to drill a hole of a different diameter.

Therefore, when changing from 1st rotation speed to 2nd rotation speed (time T2 in FIG. 1), the relationship between the operation time after rotation speed is changed and the displacement amount (delta) of a tool tip is calculated | required in advance, and 2nd rotation By correcting the cutting amount of the designated tool according to the number of operating hours by the displacement amount (δ) of the tool tip obtained beforehand, the machining with excellent depth precision is possible compared to the case of simply correcting the cutting amount by the rotation speed of the spindle and the operation time. .

1 and 2, the printed board processing machine includes a spindle for rotating the tool and a moving device 10 for moving the spindle in the axial direction of the tool. The tool is driven based on the command value. A memory device 20 in which the relationship between the operating time of the spindle and the axial displacement amount (δ) at the tip of the tool held on the spindle is stored in advance for each revolution of the spindle in the printed board processing machine which is moved and processed in the axial direction of the spindle, When the processing unit 21 is provided with the arithmetic unit 21 and the timer 22, the cutting amount of the tool is determined based on the number of revolutions of the spindle set for processing and the elapsed time after the start of processing measured by the timer. By correcting by the displacement amount δ obtained in advance, it is possible to process with excellent depth accuracy. On the other hand, the storage device 20, the calculation device 21 and the timer 22 are installed inside the NC device 23.

1 is actual measurement data of the amount of extension of the spindle tip.

2 is a perspective view illustrating a configuration of a printed circuit board processing machine.

         Explanation of symbols on the main parts of the drawings

     δ: displacement amount

     20: storage device

     21: computing device

     22: timer

Claims (3)

The relationship between the running time of the spindle and the amount of axial displacement of the tool tip held on the spindle is determined in advance for each revolution of the spindle, And the amount of cutting of the tool is corrected by the displacement amount determined in advance based on the number of revolutions of the spindle set for processing and the elapsed time after the start of processing. When the rotation of the spindle is changed from the first rotational speed to the second rotational speed, the relationship between the operating time of the spindle after the change and the amount of axial displacement of the tool tip held on the spindle is determined. I save it beforehand every time, And a cutting amount of the tool is corrected by the displacement amount, which is obtained in advance, based on the elapsed time after the change to the second rotational speed and the second rotational speed. A printed board processing machine having a spindle for rotating a tool and a moving device for moving the spindle in the axial direction of the tool, wherein the tool is moved by a distance based on a command value in the axial direction of the tool and processed. A memory device, arithmetic unit, and a timer, which store the relationship between the operating time of the spindle and the amount of axial displacement of the tip of the tool held on the spindle in advance for each revolution of the spindle, When the machining is started, the cutting amount of the tool is corrected by the displacement amount determined in advance based on the rotation speed of the spindle set for the machining and the elapsed time after the start of machining measured by the timer. Printed board processor.

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