JPS60232827A - Wire electric discharge machine - Google Patents

Abstract

PURPOSE:To facilitate amendment of the finishing dimensions of a workpiece having different shrinkage rates in the X axis and in the Y axis by multiplying driving shafts of a driving unit for controlling relative movement between a wire electrode and a workpiece by magnifications specific to the respective shafts. CONSTITUTION:In a wire discharging machine, when calculation of each shaft travel data is performed, magnifications are independently determined for the X axis and y axis, and travel information, after divided, is multiplied by the magnifications. In other words, when an input graph is to be machined at an S1 magnification in the X axis and at an S2 magnification in the Y axis, the input travel information is at first divided into minute sections and then the information in the X axis is multiplied by S1 to be sent to a pulse distributing circuit. Thus constructed in such a way as to multiply driving shafts of a driving unit for controlling relative movement between a wire electrode and workpiece by magnifications specific to the respective shafts, amendment of the finishing dimensions of the workpiece having different shrinkage rates in the X axis and Y axis can be easily executed.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention is directed to a method in which a wire electrode Wk is opposed to a workpiece through a small gap, and a pulsed electric discharge is generated between the workpiece and the wire electrode. Regarding wire electrical discharge machining equipment that repeatedly generates electrical discharge energy to cut a workpiece, in particular, is there any relative movement between the wire electrode and the workpiece? This relates to a wire electrical discharge machining device that has an independent magnification function for each axis of the driving shaft of the controlling drive device. [Prior art] The wire electrical discharge machining device can easily perform complex cutting operations on hard metals, etc. with high precision. It is well known as having the advantage that it can be carried out, and FIG. 1 is a schematic diagram thereof. In the mounting section shown in the figure, the table (1) carries the workpiece (2) and moves relative to the wire electrode (3). A feeding servo motor (4) and a feed screw (generally a pole screw (5)
) are concatenated.

Then, by the movement command of the numerical control device (6), the XY?
'[Move in 11 directions. The device shown in Figure 1 is a semi-closed system, and the output of the one-rotation angle position detector (7) is controlled by several whistles! This is a method of feeding back to @(6).

When moving the XY table, information is read as shown in FIG. 2, and if the information is a movement command, movement commands for each axis are calculated. The moving distance of the table 0η is proportional to the number of command pulses from the pulse distribution circuit (8). Therefore,
When cutting a figure that is 8 times the input figure using the conventional same magnification function for each axis, the pulse distribution circuit (8) outputs command pulses S times as many for the X and Y axes for each axis. It is processed in the movement data calculation stage (Pl). Then, the output from the pulse distributor (8) is transferred to the digital phase modulation circuit (
9), amplify the signal with the servo amplifier α0 until the signal matches the phase with the one-rotation angle position detector (7), and drive the servo motor (4) to move the XY table αη. , cuts a figure eight times the size of the input figure.

FIG. 8 illustrates the contents processed in the movement data calculation (Pl) part of each axis in FIG. 2.
When processing by multiplying, the movement information inputted as shown in FIG. 8(a) is multiplied by eight in the X-axis direction and the Y-axis direction, respectively. Next, the movement information is divided into minute movement information at equal intervals and input to the pulse distribution circuit (8). Figure 8 (b) shows the case of a rectangle, but when processing a figure that is 8 times the size of the input (2) shape (shaded area),
The signal is divided into Y2 equal intervals Δl and input to the pulse distribution circuit (8). FIG. 8(Q) shows the case of a circular arc, and the input circular arc Ll 1ff is multiplied by 8 and set as the machining lining L2. Divide the arc by a small central angle Δθ, divide it into equally spaced Δl,
Input to pulse distribution circuit (8).

As described above, in the conventional device, each axis (X-axis,
(Y-axis) have the same magnification function.

It is not possible to set the magnification independently for each axis, and if the workpiece is deformed due to residual stress or the workpiece has directionality and the shrinkage rate is different, the finished dimensions of the workpiece may be different in the X and Y directions. There was a problem.

[Summary of the invention]

This invention was made in order to eliminate the above-mentioned conventional problems, and it involves multiplying the drive shafts of the drive device that controls the relative movement between the wire electrode and the workpiece by multiplying each axis independently. Accordingly, it is an object of the present invention to provide an electric discharge machining apparatus that can easily correct deformation of a workpiece due to residual stress or correct the finished dimensions of a workpiece whose shrinkage rates differ in the X-axis direction and the Y-axis direction.

[Embodiments of the invention]

FIG. 4 shows an embodiment of the apparatus according to the present invention, and similarly to FIG. 8, it shows the processing contents in the axes movement data calculation (Pl) portion in FIG. 2.

Figure 4 (f) shows that independent magnification is provided in two directions, the X-axis direction and the Y-axis direction, and that after dividing the movement information,
This differs from the conventional method shown in FIG. 8(a) in that it is multiplied by a magnification. That is, when processing the input figure f: multiplying by S+ in the x-axis direction and 82 times in the Y-axis direction, the input movement information is first divided into minute sections, then 81 times in the X-axis direction, The signal is multiplied by 82 in the Y-axis direction and input to the pulse distribution circuit (8).

FIG. 4 (to) shows the case of a rectangle, and the input figure (hatched area) has S1. When processing a solid that is multiplied by S2, set X and Y at equal intervals Δ(1+
/ After dividing, Δl+/ is multiplied by S+ in the X-axis direction,
The movement information divided by ΔZ'+Δ12 multiplied by 82 in the Y-axis direction is input to the kepulse distribution circuit (8).

Fig. 4<a) shows the case of a circular arc. When processing the line segment L2, which is 81 times the arc Ll 1k in the X-axis direction and 81 times the Y-axis direction, the arc is divided by minute central angles Δθ and spaced at equal intervals. After dividing into arcs Δl', 81 times in the X-axis direction and 8 times in the Y-axis direction
Double the line segment Δ11. Let it be Δ12.

Then, this divided movement command is sent to a pulse distribution circuit (8
).

By the method described above, it is possible to provide independent magnification functions for the F)X and -f axes.

In addition, if the magnification function is provided independently for each of the x and y axes using the conventional method shown in Fig. 3, 6), instead of using the method described in Section 4 (2) (a),
Rectangles can be processed in the same way, but circular arcs pose a problem. That is, the arc is S+ in the X-axis direction and the Y-axis direction, respectively.
Multiplying by 81 (S+H32) results in a line segment on an elliptical locus, but it is impossible to divide this into minute line segments using the arc algorithm.

〔Effect of the invention〕

As described above, according to the present invention, the relative displacement l between the wire electric current l and the workpiece is l! For the drive shaft of the drive device that controls I,
Since the magnification is applied independently to each axis, it is easy to correct the deformation of the workpiece due to residual stress or the finished dimensions of the workpiece, which has different shrinkage rates depending on the axial direction. 1. This has the effect of allowing smooth cutting. .

[Brief explanation of drawings]

@Figure 1 is a schematic configuration diagram of the electric discharge machining device, Figure 2 is a CNC operation flowchart, Figure 8 is a diagram showing the processing direction and explanatory diagram of the conventional movement data calculation for each axis, and Figure 4 Figure 1 is an example of the present invention. Processing method and supervision of each axis movement data calculation; opening. In the figure, (1) is a daple, (2) is a TJI object, (3
) is the wire electrode, (4) is the servo motor, (5) is the screw on the port, (fI) is the numerical controller, (7) is the rotation angle position detector, (8) is the pulse distribution circuit, (9) is A digital phase V adjustment circuit, α0 is a servo amplifier, 09 is an XY table, and (2) is each axis movement process. Representative sinner Masuo Oiwa Figure 2 Figure 3 Figure 4 (αn (0-n (shi) (b) (() (C)

Claims (1)

[Claims] Wire electric gi to the workpiece! In the wire electrical discharge machining apparatus, the wire electrical discharge machining apparatus cuts a workpiece using electrical discharge energy while relatively moving the workpiece and the wire electric shock based on a predetermined movement pulse. A wire electric discharge machining device characterized in that a drive shaft of a drive device that controls relative movement between an electrode and a workpiece is provided with an independent magnification function for each axis.