JPS6393525A - Electric spark device - Google Patents

Abstract

PURPOSE:To allow discharge machining like a bar-shaped electrode and reduce the wear and tear of an electrode by integrally rotating a moving wire electrode and a wire guide forming the moving passage of the electrode with a electrode rotating means in an NC electric spark device or the like. CONSTITUTION:A wire electrode moving mechanism moving a wire electrode 4 from a feed reel 5 to a take-up reel 7 and a wire guide 3 are integrally fixed to an electrode rotating means 2. Therefore, when the electrode rotating means 2 is rotated, the locus of the wire electrode 4 which is the outermost edge of this discharge machining section forms a bar-shaped electrode equivalently, and the discharge machining like a bar-shaped electrode can be performed. Discharge is intermittently performed between the wire electrode 4 and a work 11, the wire electrode 4 worn by this machining is wound on the take-up reel 7 by a take-up motor 8, and a new wire electrode 4 is fed to the wire guide 3 by the feed reel 5.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an electric discharge machining apparatus, and particularly to an NC electric discharge machining apparatus and the like that performs machining by relatively moving a machining electrode and a workpiece. It is related to.

[Prior Art] This type of electrical discharge machining apparatus processes a workpiece by intermittently generating electrical discharge between a machining electrode and a workpiece in an insulating machining fluid. Widely used for precision machining of mold materials, etc. Note that the electric discharge machining method using this type of electric discharge machining apparatus is generally called a contour machining method (two-dimensional) or a generating machining method (three-dimensional).

Conventionally, this type of electrical discharge machining method and electrical discharge machining equipment are
A single rod-shaped or cylindrical electrode is inserted as a machining electrode into the main shaft that slides up and down, and the machining electrode is rotated to remove slag generated during machining. There was a lot of processing involved. However, in this type of electrical discharge machining equipment, the same electrode surface repeatedly faces the machining electrode and the hOT surface of the workpiece during machining, so for example, the machining shape is complex, the machining circumference is long, and As the amount increases, the number of discharges from the same electrode surface increases. Therefore, as the machining progresses, the machining electrodes are significantly worn out, and the machining accuracy also deteriorates.

In order to alleviate this drawback, there is an electric discharge machining apparatus that uses a moving wire electrode as a machining electrode.

A known example of an electric discharge machining apparatus using this type of wire electric tI is a technique disclosed in Japanese Patent Application Laid-open No. 182029/1983.

[Problems to be solved by the invention] Conventional processing electrics as mentioned above? In an electric discharge machining apparatus using a rod-shaped or cylindrical single-shaped electrode as M, there is a problem in that the machining electrode is severely worn out and the machining accuracy is reduced. For this reason, there are problems such as frequent replacement of the machining electrode or machining while molding the machining electrode, which increases machining time and makes operation of the electrical discharge machining apparatus cumbersome.

In addition, in the conventional electrical discharge machining device using a wire electrode described in the above-mentioned publication, consumption of the machining electrode can be reduced;
There was a problem in that the processing shape was subject to significant restrictions.

In other words, when cutting a workpiece in a straight line, or when using the tip of this wire electrode to perform fine shaft machining, peripheral groove machining, etc., it is limited to machining using a lathe or milling machine, and the use of a single cylindrical electrode is limited. (J, not suitable for flexible processing such as when using etc.

Therefore, the present invention has been made to solve these problems, and provides an electric discharge machining device that can reduce the wear and tear of the machining electrode and can perform electric discharge machining as easily as or more freely than a simple rod-shaped electrode. The purpose is to

Means for Solving Problem 1] The electric discharge machining apparatus according to the present invention includes an electric discharge machining section including a wire electrode that moves as a machining electrode and a wire guide that forms a moving path for the wire electrode, and a wire electrode and a wire guide. It is equipped with an electrode rotation means that rotates the wire guide integrally.

"Function" In this invention, the wire electrode that moves as the processing electrode and the wire kite that forms the moving path of this wire electrode are rotated together by the electrode rotation means, so that the wire electrode that moves as the processing electrode and the wire kite that forms the moving path of this wire electrode are rotated together by the electrode rotation means. Similar electric discharge machining can be performed, and wear of the machining electrode can be reduced.

[Example] Fig. 1 is an exploded schematic configuration diagram showing an electric discharge machining apparatus according to an embodiment of the present invention, and (a> in Fig. 2 shows a machining electrode of the electric discharge machining apparatus according to an embodiment of the present invention). It is a front view of the main part,
(b) is a side view of the main part, FIG. 3 is a front view showing the tip of the machining electrode of an electric discharge machining device according to another embodiment of the present invention, and FIG. 4 is a side view of the main part of the same, FIG. X-x cross section and third
It is a sectional view showing the )/-Y cross section of the figure.

In the figure, (1) is a head having a servo mechanism (not shown) that can be freely adjusted in the depth direction below -F of the processing electrode;
2) is an electrode rotating means fixed to this head (1>),
The electrode rotating means (2) is constructed by attaching the processing electrode side to the rotating shaft of a motor fixed to the head (1) side.

(3) is a wire kite connected to this electrode rotating means (2), and (4) is a wire north pole that is supported and moved by this wire guide (3). (5> is a supply reel for supplying the wire electrode (4), (6) is a brake for applying tension to the wire electrode (4), (7> is a winding reel for winding the wire electrode (4)) (8) is a take-up motor that drives this take-up reel (7), and (9) and (10) are guide rollers on the supply side and take-up side, respectively, for the wire electrode (4). A supply reel (5), a brake (6), a take-up reel (7), a take-up motor (8), and guide rollers (9) and (10) are connected to an electrode rotating means (2) connected to a wire guide (3). It is built into the integrally attached housing (2a).

In addition, (11) is a workpiece, which is a workpiece, and (12)
(13) is the machining tank that performs electrical discharge machining (
12) Machining fluid, which is insulating oil, stored in (14)
> is a power source for electric discharge machining that is connected to the wire A7 electrode (4) and the workpiece (11), respectively, and supplies electrical energy.

In the electrical discharge machining apparatus configured as described above, the wire electrode (
4) Moving the wire electrode machine groove and wire guide (
3> are integrally fixed to the electrode rotating means (2), so when the N-pole rotating means (2) is rotated, the wire electrode (4), which is the outermost edge of this electrical discharge machining section, is rotated. The trajectory will equivalently form a rod-shaped electrode. That is, in this electric discharge machining apparatus, a diameter machining electrode is formed as shown in FIG. 4, and electric discharge machining can be performed in the same manner as with a rod-shaped electrode.

Then, electrical discharge is performed intermittently between the wire electrode (4), which is the electrode for this machining, and the workpiece (11), and electrical discharge machining is performed.
4) is wound onto the take-up reel (7) by the take-up motor (8), and the new wire electrode (4) is placed on the supply reel (5).
The wire kite (3) is then supplied to the wire kite (3).

Therefore, compared to conventional simple electrodes such as rod-shaped electrodes, wear and tear on the electrical discharge machining part that acts as a machining electrode can be reduced, and the machining electrode can withstand continuous machining for long periods of time, improving JJOT accuracy. It is possible to prevent deterioration and maintain constant accuracy at all times. Therefore, there is no need to frequently replace the machining electrode or to mold the electrode for cutting, the machining time can be shortened, and the operation of the electrical discharge machining apparatus becomes easier.

Here, an electrical discharge machining apparatus according to another embodiment of the present invention will be described.

In the above embodiment, either the wire electrode (4) or the wire kite (3
), and in a state where tension is applied to both ends of the wire electrode (4), the processing electrode is formed with tension applied to both ends of the wire electrode (4). A guide roller (
15) may be provided. This guide roller (15) is installed (the machining electrode is shown in the front view of the tip of the machining electrode of the electrical discharge machining apparatus in FIG. 3).

As shown in FIG. 3, by providing a guide roller (15) at the tip of the wire guide (3), the frictional resistance generated in the wire movement path can be reduced, and the wire electrode (
4) Since the tension unevenness can be eliminated, more stable electric discharge machining can be performed. The processing electrode in this case will also be equivalently formed into a rod-shaped electrode similar to the above embodiment, and will form a processing electrode with a diameter as shown in Fig. 4, so the rod-shaped electrode will be It is possible to perform electrical discharge machining similar to

Further, in the above embodiment, the wire kite (3) as a processing electrode has a substantially U-shaped cross section and is formed by a pair of wire electrodes (4).
has a cross-sectional shape of approximately 1-1-, and two pairs of wire electrodes (
4) may be formed.

FIG. 5(a) is a front view showing the tip of the machining electrode of an electric discharge machining apparatus which is still another embodiment of the present invention.
FIG. 6B is a sectional view taken along line 7-7 of FIG. 5A, and FIG. 6 is a perspective view of the processing electrode shown in FIG. 5 without showing the wire guide at the tip.

In this way, by using two pairs of wire electrodes (4), the electric discharge machining area for electric discharge machining can be increased, and the number of electric discharges can be increased.As a result, the machining speed of the workpiece (11) can be increased. It is possible to increase the processing time and promote the reduction of processing time. a3, this wire electrode (4) may be further increased to have multiple pairs, and the cross-sectional shape of the wire kite (3) may also be shaped to match this wire electrode (4), and -1 port = this wire guide A guide roller (15) may be provided at the tip.

The machining electrode in this example also forms a rod-shaped electrode equivalently as in the above-mentioned example, and the wire electrode (4) moves and becomes rough due to electric discharge. Electric discharge machining using electrodes can be avoided and electric discharge machining can always be performed using the wire electrode (4) which is not discharged, and machining characteristics superior to those obtained with rod-shaped electrodes can be obtained.

Further, it is possible to promote reduction in processing time and ease of operation of processing equipment.

In addition, in the above embodiment, an electrical discharge machining was explained in which the workpiece is machined by causing an intermittent electrical discharge between the machining electrode and the workpiece in an insulating machining fluid, but the present invention When performing this, it can be used with a general wire-cut electrical discharge machine.

In addition, in the above embodiments, a wire kite plate with a wire guide having a cross-sectional shape of a substantially cross-shaped shape and a wire guide with a cross-sectional shape of a substantially cross-shaped wire guide are used. When carrying out the invention, it can be used in the shape of a round bar or square bar, depending on the shape to be processed.

[Effects of the Invention] As explained above, the electric discharge machining apparatus of the present invention rotates the wire electrode that moves as a machining electrode and the wire guide that forms the movement path of this wire electrode together by the electrode rotation means. Since it is a simple rod-shaped electrode, it is possible to obtain electrical discharge machining characteristics similar to or better than that of a simple rod-shaped electrode, and furthermore, since wear of the machining electrode can be reduced, machining accuracy can be maintained.

[Brief explanation of the drawing]

FIG. 1 is an exploded schematic configuration diagram showing an electric discharge machining apparatus according to an embodiment of the present invention, and (a) in FIG. 2 is a schematic front view showing a machining electrode of the electric discharge machining apparatus according to the present invention. 3 is a schematic side view thereof, FIG. 3 is a front view showing the tip of a machining electrode of an electric discharge machining apparatus according to another embodiment of the present invention, and FIG. 4 is an X in FIG. 2(a)=12- - A sectional view showing the X cross section and the YY cross section of FIG. 3,
FIG. 5(a) is a front view showing the tip of a machining electrode of an electric discharge machining apparatus which is still another embodiment of the present invention, and FIG. 5(b)
is a sectional view showing the Z-7 cross section of (a>, and FIG. 6 is a perspective view without showing the wire guide at the tip of the processing electrode of FIG. 5. In the figure, 2: electrode rotation means, 3: Wire guide, 4: Wire electrode, 11: Workpiece, 13: Processing liquid, 15 Ni guide roller. In addition, in the drawings, the same reference numerals and the same symbols indicate the same or equivalent parts.

Claims (4)

[Claims] (1) In an electric discharge machining device that processes a workpiece by causing an electric discharge between a machining electrode and a workpiece, the wire electrode moves as the machining electrode and the wire guide forms a moving path for the wire electrode. An electric discharge machining apparatus comprising: an electric discharge machining section consisting of the wire electrode and the wire guide; and electrode rotation means for integrally rotating the electric discharge machining section consisting of the wire electrode and the wire guide. (2) The electric discharge machining apparatus according to claim 1, wherein the electric discharge machining section includes a wire guide plate having a substantially straight-line cross-sectional shape and a pair of moving wire electrodes. . (3) The electric discharge machining apparatus according to claim 1, wherein the electric discharge machining section includes a wire guide having a substantially cross-sectional shape and two pairs of moving wire electrodes. . (4) The electrical discharge machining according to any one of claims 1 to 3, wherein the wire guide has a wire guide plate and a guide roller for a wire electrode at the tip thereof. Device.