JPS6161718A - Wire-cut electric discharge machining device - Google Patents

Abstract

PURPOSE:To prevent the phenomenon of short-circuit from occurring, and to prevent machining hindrance from occurring, by filling a filler into a cut groove formed in a workpiece by a cutting process, and by holding a scrap produced from the workpiece by means of the filler. CONSTITUTION:A cutting machining process is carried out by a wire electrode 3 from a machining starting hole 26 in the direction of the arrow (a) to form a cut groove 3'. When the electrode 3 reaches at, for example, the position B, the cutting machining process is temporarily interrupted, and a filler 23 is filled into the cut groove 3' at, for example, the predetermined positions C, C' from a nozzle in a filler feed device (which is not shown), and is secured. A scrap 1' is held by means of the filler, and therefore, will not move. Then the remaining part may be cut and removed.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention is a wire-cut electric discharge machining apparatus, in particular, a filler supply device for injecting a filler into a cutting groove produced by wire-cut electric discharge machining, 9. Relating to a wire-cut electric discharge machining apparatus that holds loose parts of a workpiece produced by wire-cut electric discharge machining through a filler injected into the wire-cut electric discharge machining apparatus. It is.

(Prior Art and Problems) Generally, in wire-cut electrical discharge machining in which cutting is performed by electrical discharge machining using a wire electrode, a part (hereinafter referred to as (referred to as scrap) is generated. Immediately before the scrap is completely released, the scrap moves while being slightly connected to the main body of the workpiece, so the wire electrode directly contacts the scrap and the workpiece. Short circuit phenomena may occur.

Due to the occurrence of the short circuit phenomenon, the discharge state becomes unstable, making it impossible to continue the normal cutting process, and if the short circuit phenomenon continues for a long time, the wire electrode will break and the cutting process will have to be stopped. There was a problem that undesired processing failure occurred.

(Means for Solving the Problems) The present invention aims to solve the above-mentioned problems, and therefore, the wire-cut electrical discharge machining apparatus of the present invention is capable of processing a workpiece by electrical discharge machining using a wire electrode. A wire-cut electric discharge machining device that performs cutting is provided with a filler supply device that injects a filler into a cutting groove created by the cutting process using the wire electrode, and the filler is injected into the cutting groove by the filler supply device. The present invention is characterized in that the free portion of the workpiece produced by the cutting process is held through the cutting process, and undesired movement of the free portion is prevented.

(Embodiments of the Invention) Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a configuration of an embodiment of a wire-cut electrical discharge machining apparatus of the present invention, FIG. 2 is a sectional view of an embodiment of a filler supply device used in the present invention, and FIG. An explanatory diagram for explaining a scrap holding mode in FIG.

In the illustrated embodiment in FIG. 1, reference numeral 1 in the figure indicates a workpiece;
1' is a scrap, 2 is a processing table, 3 is a wire electrode, 3' is a cutting groove, 4 and 5 are control motors 2 that drive the processing table 2 in orthogonal X, K and Y directions, and 6 is a A wire electrode supply roller, 7 and 10 tension rollers, 8 an upper guide, 9 a lower guide, 11 a scrap roller, 12 and 13 control motors that move the upper guide 8 in orthogonal X and Y directions. 14 is a filler supply device/device, 15 is a nozzle that allows the filler in the filler supply device 14 to flow out, and 16 is a filler. The feed control devices 17 and 17' are flexible pipes which control the filler feed device 14.
The piston (indicated by reference numeral 22 in FIG. 2), which will be described later, is
18 is a cable that supplies the driving medium, and is connected to a heater (second
Reference numeral 24) in the figure is supplied with power, and reference numeral 19 represents a control motor that raises and lowers the filler supply device 14.

The machining table 2 tanning II Ja motor 13 of the wire-cut electrical discharge machining apparatus shown in FIG. I'll keep it.

In FIG. 1, a processing table 2 is driven by control motors 4 and 5 in orthogonal X and Y directions. A wire electrode 3 for cutting a workpiece 1 placed on a processing table 2 is passed from a wire electric fence supply roller 6 to a tension roller 7, an upper guide 8, a lower guide 9, and a tension roller 10 to scrap the workpiece 1 placed on the processing table 2. It is wound up on a roller 11.

The wire electrode 3 between the upper guide 8 and the lower guide 9 is tensioned by the tension rollers 7 and 10 and is caused to run in a straight line. Furthermore, since the upper guide 8 is configured to be moved in orthogonal X1Y directions by the control motors 12 and 13, the inclination angle of the wire electric fence 3 between the upper guide 8 and the lower guide 9 can be set as desired. It can be adjusted as follows. Note that the running of the wire electrode 3, the driving of the processing table 2, the movement of the upper guide 8, etc. are all performed by, for example, NC control based on a predetermined program. Therefore, as long as the workpiece 1 placed on the processing table 2 is cut linearly, the desired cutting process can be automatically performed. However, as explained at the beginning of this specification, scrap 1' is generated in the cutting process,
Immediately before the scrap 1' is separated from the workpiece 1, it enters an unstable electrical discharge state, resulting in a machining failure that prevents automation of the entire machining process.

The filler supply device 14 of the present invention is intended to prevent the occurrence of the above-mentioned processing failure and to perform completely automatic cutting until the desired cutting is completed. Hereinafter, with reference to FIGS. 2 and 3, the above-mentioned, above-mentioned, filling, filler supplying device 14, and aspects of preventing the scrap 1' from coming loose will be explained.

First, the structure and operation of the filler supply device 14 will be explained with reference to FIG. 2. In the figure, reference numeral 20 is a cylinder section, 21 is a filler supply section, 22 is a piston, 23 is a filler, 24 is a heater, and other symbols correspond to those in FIG.

In FIG. 2, the filler 23 according to the present invention has a relatively low temperature (e.g. 50° to 100° C.).
Low-melting point alloys (for example, B1-Pb alloys) and synthetic resins that are in a molten state and exhibit little expansion or contraction upon cooling and solidification are used. The filler 23 in the filler supply section 21 is kept at a predetermined temperature by a heater 24 and maintained in a molten state.
When hydraulic pressure (or pneumatic pressure is also acceptable) is applied through the nozzle 15, the filler 23 is pressed by the lower surface of the piston 22 and flows out from the nozzle 15. Note that power supply control to the heater 24 and drive control of the piston 22 are as follows:
This is carried out by the filler supply control device shown in FIG. Further, the filler supply section 21 is provided with a filler injection means (not shown), so that when the amount of the filler 23 becomes small, the filler 23 is replenished by the filler injection means. Needless to say, it is composed of
stomach.

Next, a scrap holding aspect of the present invention using the filler supply device 14 will be explained with reference to FIG. 3. The reference numeral 26 in the figure represents a machining start hole, which is formed by penetrating a predetermined position on the scrap 1' side in order to position the wire electrode 3 at the start of machining. corresponds to FIGS. 1 and 2.

FIG. 3(2) is a partial plan view showing the cutting state of the workpiece 1 placed on the processing table 2 in the apparatus shown in FIG. It is a sectional view taken along AA.

The embodiment shown in FIG. 3 explains a scrap retention mode when cutting along a closed loop of a predetermined shape (rectangular in the embodiment shown in FIG. 3) is performed by wire-cut electric discharge machining, for example, when machining dies. FIG. That is, the cutting process by the wire electric welding 3 starts from the process start hole 26 and is performed along the direction of the arrow α in the figure. After the cutting process is performed, a cutting groove 3' is formed. When the cutting process progresses and the wire electrode 3 reaches a position close to at least the cutting groove 3' at the start of the process, for example as indicated by the arrow B in FIG. 3, the cutting process is temporarily stopped. Then, a predetermined position of the cut #3' formed by the above-mentioned cutting process (for example, the position shown in FIG.
Move the processing table 2 so that it is positioned directly below.

When the processing table 2 is moved, the wire electrode 3 may be cut, or the wire electrode 3 may be pulled without being cut by loosening the tension applied by the tension rollers 7 and 10. Then, as shown in FIG. 3(E), the filler supply device 14 is lowered by the control motor 19 until the nozzle 15 comes into contact with the workpiece 1. Then, as explained in connection with FIG. 2, the piston 22 is driven to inject the filler 23 from the nozzle 15 into the cutting groove 3' as shown in FIG. 3(B). The filler 23 injected into the cutting groove 3' is cooled (workpiece 1
Because the machining fluid is applied to the material, it cools rapidly) and solidifies. Therefore, the scrap 1' is bonded to the main body of the workpiece 1 by the solidified filler 23. In this way, the filler 23 is injected at multiple locations in the cutting groove 3'. In the embodiment shown in FIG. 3, the cutting loop has a rectangular shape, so the filler 23 is injected at the positions indicated by the arrows C and C', which correspond to the shape of the cutting loop. All you have to do is select an appropriate position to hold the scrap.

As explained above, when the injection of the filler 23 is completed, the cutting process is restarted. When restarting the cutting process, if the wire electrode 3 is not cut before moving the processing table 2 for injecting the filler, the position of the processing table 2 must be changed to the position before the movement. FIG. 3 (Support) After the wire electrode 3 is returned to the position indicated by the arrow B as shown in the figure, the cutting process is resumed in the direction of extension of the arrow α in the figure. In addition, when the wire electrode 3 is cut, move the processing table 2 so that the position at the time of starting cutting, that is, the position of the wire electrode 3 is around the center of the processing start hole 26, and then Resume cutting in the direction shown. Then, the cutting groove 3' formed after restarting the cutting process
The desired closed loop cutting process is completed by performing the cutting process until the cutting groove 3' communicates with the already formed cutting groove 3'.

It should be noted that all the cutting operations including the filler injection described above are performed under NC control based on a predetermined program, so that all the above-mentioned processing steps are performed automatically. As explained in connection with FIG. 3, since the scrap 1' cut off from the workpiece 1 is held by the filler 23, when the scrap 1' is cut off as explained at the beginning of this specification, It becomes possible to prevent the occurrence of an unstable discharge state.

(Effects of the Invention) As explained above, according to the present invention, it is possible to completely retain scraps generated by wire-cut electric discharge machining, so that all desired cutting processes can be performed completely automatically. be able to.

[Brief explanation of drawings]

Fig. 1 shows the construction of an embodiment of the wire-cut electrical discharge machining device of the great invention, Fig. 2 is a sectional view of an embodiment of the filler supply device used in the invention, and Fig. 3 (2) shows an explanatory diagram for explaining the scrap holding aspect in the present invention. In the diagram, 1 is a workpiece, 1' is a scrap, 2 is a processing table, 3 is a wire electrode, 3' is a cutting groove, 4.5 .12.
13 and 19 are control motors, 6 is a wire ti supply roller, 7 and 10 are tension rollers, 8 is an upper guide, 9 is a lower guide, 11 is a scrap roller, 1
4 is a filler supply device, 15 is a nozzle, 16 is a filler supply side a device, 17 and 17' are flexible pipes,
18 is a cable, 20 is a cylinder section, 21 is a filler supply section, 22 is a piston, 23 is a filler, and 24 is a heater. Patent applicant: Discharge Precision Machining Research Institute Co., Ltd. Representative patent attorney: Hiroshi Mori (3 others) Age 2m Age 3ka (S)

Claims (1)

[Claims] A wire-cut electrical discharge machining device for cutting a workpiece by electrical discharge machining using a wire electrode, comprising a filler supplying device for injecting a filler into a cutting groove created by cutting using the wire electrode. , through the filler injected into the cutting groove by the filler supply device, the free portion of the workpiece produced by the cutting process is held and the undesired movement of the free portion is prevented. A wire cut electrical discharge machining device characterized by: