JPH04105820A - Wire electric discharging device - Google Patents

Abstract

PURPOSE:To cut back the arrangement time of work, by providing a correction mechanism which corrects a taper angle quantity from a wire electrode diameter, wire electrode tension and commanded taper angle, with the use of a stored taper angle correction quantity data. CONSTITUTION:Taper angle correction quantity data for the three elements (parameter) of a wire electrode diameter, wire electrode tension and commanded taper angle are stored in a memory device 82 inside an NC control unit. An effective taper angle is then found by adding correction by a correction part 84 on the taper angle quantity from the wire electrode diameter, wire electrode tension and commanded taper angle, with one block unit of the execution of the NC program input to the NC control unit.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a taper machining device in a wire electrical discharge machining device.

[Prior art] Fig. 3 is a configuration diagram showing a conventional wire electric discharge machining device;
The figure is an explanatory diagram showing the angular error of the wire electrode when the taper angle is set in the wire electric discharge machining apparatus of FIG. 3. In the figure, 10 is a movable table on which a workpiece 12 is placed and fixed, and this movable table 10 consists of sliding tables 16 and 20. 22 is the NC control device, 14 is X
The shaft drive motors include an X-axis drive motor 18, a U-axis drive motor 70, and a V-axis drive motor 72. 26 is a wire bobbin around which the wire electrode 24 is wound before use, 38 is a wire bobbin around which the wire electrode 24 is wound after use, and 28.34 is the wire electrode 24 and the workpiece 120.
30 and 32 are an f-section kite and a -L section guide for supporting the wire electrode 24; and 36 is a tension roller for winding up the wire electrode 24.

40 is a power supply device for supplying voltage to the power supply section 28.34, 42 is a DC power supply, and 44 is a power supply for turning on and off the DC power supply 42.
46 is a charging capacitor, 48 is a limiting resistor, and 50 is a control unit for the switching transistor 44. 52 is a machining fluid device, 54 is a machining fluid supplied as a discharge medium between the workpiece 12 and the wire electrode 24, and 56 is a machining fluid 5
58 is a filter for filtering the machining fluid 54, 60 is a pump for pumping out the machining fluid 54, and 62 is a nozzle for spouting the machining fluid 54.

Next, the operation of taper machining in the conventional wire electric discharge machining apparatus described above will be explained. The lower guide 30 is driven by the X-axis drive motor and the Y-axis drive motor 18 and moves relative to the workpiece 12 on the XY-axis plane. Further, the upper guide 32 is connected to a U-axis drive motor 70 and a V-axis drive motor 7.
2 and moves relative to the lower guide 30.

Therefore, each of the Y-axis, Y-axis, U-axis, and V-axis drive motors 14
, 18, 70, and 72, the wire electrode 24 can be tilted at any angle for processing. A command for performing such machining is given by an NC program input to the NC control device 22, and usually a command is given as the taper angle to indicate how many angles the wire electrode 24 should be inclined with respect to the direction of movement. Normally, when calculating the taper angle, if the taper angle is θ and the kite span is Z, the relative movement amount of the upper kite 32 with respect to the lower guide 30 is L-Z-tanθ, and the NC control device 22 executes the NC program. The above calculation is performed for each l block, and the amount of movement of the Y-axis and Y-axis corresponding to the amount of movement of the lower guide 30 and the amount of movement of the U-axis and Y-axis corresponding to the amount of movement of the upper guide 32 are calculated. Taper machining is performed while controlling the drive motor for each axis. Furthermore, the taper angle can be arbitrarily changed for each execution block of the NC program even in one machined shape.

[Problems to be Solved by the Invention] The conventional wire electric discharge machining apparatus described above is configured as described above, and generates electric discharge between the wire electrode 24 and the workpiece 12 to When performing a wire cut process, tension is applied to the wire electrode 24 by the tension roller 36 and the process is performed while feeding the wire electrode 24. However, in reality, due to the rigidity of the wire electrode 24, the wire electrode 24 is not arranged in a straight line from the upper guide 32 to the lower guide 30 as shown by the broken line in FIG. In the vicinity of the lower guide 30, the wire electrode 24 has an arcuate shape. In particular, in the vicinity of the upper guide 32, the wire electrode 24 does not have a simple arc shape due to the influence of the power supply section 34 located above the upper guide 32, so the commanded taper angle is not achieved and the actual Since the taper angle is machined to be larger than the set taper angle, the operator must perform test machining to confirm whether the set taper angle is set before machining. As a result, there are problems such as the machining work becomes extremely complicated and it is difficult to perform highly accurate taper machining on the workpiece 12.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a wire electric discharge machining apparatus that can further improve the accuracy of taper machining of a workpiece.

[Means for Solving the Problems] The wire electrical discharge machining apparatus according to the present invention stores taper angle correction amount data for three elements (parameters): wire electrode diameter, wire electrode tension, and commanded taper angle in the NC control device. This is stored in the device, and when a taper angle command is issued, the effective taper angle is automatically corrected based on the wire electrode diameter, wire electrode tension, and command taper angle using the taper angle correction amount data.

[Function] Taper angle control by the wire electrode processing device of the present invention involves storing taper angle correction amount data for three elements (parameters): wire electrode diameter, wire electrode tension, and command taper angle in a storage device inside the NC control device. N
The effective taper angle is determined by correcting the taper angle amount from the wire electrode diameter, wire electrode tension, and commanded taper angle for each block of execution of the NC program manually input to the C control device.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings. 1st
The figure is a block diagram showing the configuration of a taper angle control device in a wire electrical discharge machining apparatus according to an embodiment of the present invention.

In the figure, 80 is an NC program input section, 81 is a movement amount calculation section, 82 is a storage section, 83 is an interpolation processing section, 84 is a taper angle correction section, and 85 is an N in which the NC program is stored.
It is C tape.

FIG. 2 is a diagram showing a data table for determining the correction amount of the taper angle in the taper angle control device of FIG. 1.

Next, the operation of the taper angle control device in the wire electrical discharge machining apparatus according to the embodiment of the present invention will be explained.

The NC program manual section 80 reads the NC program stored in the NC tape 85 into the NC control device 22 and transmits it to the movement amount calculation section 81 . At this time, when a taper angle command is issued, this command taper angle data is stored in the storage unit 82.
to be memorized. Next, the taper angle correction section 84 inputs the command taper angle data set in the storage section 82 by the NC program human power section 80, and calculates the taper angle correction amount from the wire electrode diameter data, wire electrode tension data, and command taper angle data. The effective taper angle data is determined and set in the storage unit 82. The movement amount calculating section 81 is an NC program human power section 80.
The movement amounts of each of the X-axis, Y-axis, U-axis, and V-axis are calculated from the commanded movement amount input in , and the effective taper angle data set in the storage section 82 and output to the interpolation processing section 83 . The interpolation processing unit 83 outputs the movement output to each X-axis, Y-axis, U-axis, and ■-axis drive motor 14 according to the movement amount of each X-axis, Y-axis, U-axis, and ■-axis calculated by the movement amount calculation unit 81. ．． ．． 18,7
0.72 and move.

Next, regarding the processing contents of the taper angle correction section 84, the second
This will be explained with reference to the figures. FIG. 2 shows a data table for calculating the correction amount of the taper angle from the wire electrode diameter, wire electrode tension, and commanded taper angle. Create a data table in degrees. For example, if the wire electrode diameter is 0.2 mm, the command taper angle is 3 degrees, and the wire electrode tension is 2 notches, the taper angle correction amount is 0.0550 degrees, and the correction direction is the command taper angle. Correct to make it smaller. In addition, if the commanded taper angle is 2.4 degrees, which does not exist in the data table shown in Figure 2, the correction amount is calculated by proportional calculation from the angle data registered in the data table before and after it. calculate. For example, if the commanded taper angle is 2°4 degrees, and the wire electrode tension is 2 notches, the correction angle data for the commanded taper angle of 2 degrees is 0.0210.
0.055 of the correction angle data for the commanded taper angle of 3 degrees
The correction angle data for the commanded taper angle of 2.4 degrees from 0 degrees is 0.0210+ (0,0550-0,0210)*4
000/10000=0.0346 [deg], and as a result, an angle correction of 0.0346 degrees is performed.

As described above, inside the NC control device 22, a data table in the format shown in FIG. The three elements (parameters) of
The manufacturer side then supplies this to the user side. N
The C control device 22 performs machining by automatically correcting the commanded taper angle of the manually inputted NC program.

In the above embodiment, the configuration of the data table shown in Fig. 2 is displayed in the case where the command taper angle is set in units of 1 deer, but this unit may be changed, and the unit may be changed in finer units. Needless to say, the correction accuracy is further improved.

[Effects of the Invention] As described above, the wire electrical discharge machining apparatus of the present invention can reduce warpage by three factors: wire electrode diameter, wire electrode tension, and commanded taper angle.
Taper angle correction amount data for two elements (parameters) are stored in a storage device inside the NC control device, and when a taper angle command is issued, the wire electrode diameter and wire electrode tension are calculated using the taper angle correction amount data. Since the effective taper angle is automatically corrected based on the command taper angle,
In taper machining, the NC control device can automatically correct the taper angle in response to the commanded taper angle, so the operator does not need to measure and correct the actual taper angle before machining. This eliminates the need for test machining, which reduces work setup time.Also, even if the taper angle is changed during machining, machining can be performed at an accurate angle, making it extremely easy to perform high-precision machining. It has excellent effects such as achievable.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a taper angle control device in a wire electrical discharge machining apparatus according to an embodiment of the present invention, and FIG. 2 is a data table for determining the correction amount of the taper angle in the taper angle control device of FIG. 1. Figure 3 is a configuration diagram showing a conventional wire electrical discharge machining device, and Figure 4 is a diagram showing a conventional wire electrical discharge machining device.
FIG. 3 is an explanatory diagram showing the angular error of the wire electrode when the taper angle is set in the wire electrical discharge machining apparatus shown in the figure. In the figure, 10...Movable table, 12...Fragmented object, 14...X-axis drive motor, 16...Sliding table, 18-...X-axis drive motor, 20...Sliding Table, 22... NC control device, 24... wire electrode,
26...-wire hobbin, 28...-power supply section, 30-...
・Lower kite, 32...-Upper guide, 34...Power supply unit, 36...Tension roller, 38...Wire bobbin, 40...Power supply device, 42...DC power supply, 44
Switching transistor, 46 Charging capacitor, 48 Limiting resistor, 50 Control unit, 52 Machining fluid device, 54 Machining fluid, 56 Machining tank, 58...filter, 60...
Pump, 62... Nozzle, 70... U-axis drive motor, 72... X-axis drive motor, 80... NC program human power section, 81... Travel amount calculation section, 82... Storage section , 83... interpolation processing section, 84... taper angle correction section, 85... NC tape. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] Wire electrical discharge machining that has a taper cut function that allows the guide of the wire electrode to be horizontally shifted at the upper and lower positions of the workpiece and set the wire electrode to any inclination angle, and that is controlled by an NC control device. In the apparatus, a storage device of the NC control device records taper angle correction amount data for three elements: wire electrode diameter, wire electrode tension, and commanded taper angle; Using the taper angle correction amount data,
A wire electrical discharge machining device characterized by comprising a correction mechanism that corrects a taper angle amount from a wire electrode diameter, wire electrode tension, and commanded taper angle.