JPS6171917A - Electric discharge machine - Google Patents

Abstract

PURPOSE:To continuously and automatically perform electric discharge processing on a common processing table by use of a wire cut discharge processing unit and a profiling discharge processing unit. CONSTITUTION:A workpiece mandrel 1 is fixed on a work mount part 24 of a processing head 23, and a raw material of a processing electrode 13 is set on a processing table 10. An opening part 13' corresponding to a shape of a bearing surface 2 of the mandrel 1 is formed with the aid of wire cut discharge processing by use of a wire electrode 14. With the processing table moved to a prescribed position, the bearing surface of the mandrel is processed employing the electrode 13 as a processing electrode and by use of profiling discharge processing with the aid of the head 23. Thus, the entire process from manufacturing the electrode to processing the mandrel is automatically effected in succession.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an electric discharge machining apparatus, particularly an electric discharge machining apparatus for machining a male-shaped body by electric discharge machining. The above-mentioned machine is provided with a machining unit and a force table commonly used in the discharge power loe of each of the wire cutter, electric discharge machining unit and die-sinker electric discharge machining machine, and for machining the male shaped body. Fabrication of machining electrodes using a wire-cut electric discharge machining unit and die-sinking electric discharge machining T using the machining electrodes
The present invention relates to an electric discharge machining apparatus in which the h11-shaped body is continuously and automatically machined by a unit.

(Traditional techniques and problems) Conventionally, for example, the extrusion die as shown in Fig. 3 is used to apply the mandrel hair link surface 2 of the mandrel 1 to the extrusion die as shown in Figure 3. This is done using processing equipment.

That is, a machining electrode (not shown) having a cross section 1f11 shape corresponding to the bearing hole 5 to be formed at -1 m is shown in FIG.
13) A ring hole 5 is formed by a die-sinking electrical discharge machining opening performed by feeding in the direction of arrow B shown in the figure.

In addition, Fig. 3 (A) is a plan view, Fig. 3 (1'3) number, 1
FIG. 3 (A) shows a sectional view taken along the arrow /l-A,
23 in the diagram:, @, ! is Man1 Lulu, 2 is Manto [7
Moon/bearing surface, 3 is pouring part, 4 is part of inlet,
5 is a ring hole, 6 is a die, 7 is a back relief part, 8 is)
, Represents pin, 9GJ dice and hair link sides.

In the conventional machining force method, the gap (
The illustrated arrow (1) is determined by the thickness of the machining electrode.However, there is a limit to reducing the thickness 7 of the machining electrode due to mechanical strength issues.Therefore, conventional machining methods In the extrusion die according to the present invention, there was a problem that the gap d between the ring holes 5 could not be made as small as desired.

Therefore, in order to solve the problem as described in 2., the applicant of the present application separately processed the hair ring surfaces of the die and the mandrel, and then assembled them as shown in FIG. Proposed a method for manufacturing an extrusion die with a bearing hole with a narrow gap (Japanese Patent Application No. 58-12922)
0) l.

This proposal has some excellent features in solving the above-mentioned problems, but when processing the mandrel hair ring surface 2, a so-called so-called A machining electrode of general shape 1 is used. Therefore, the process of preparing the machining electrode in advance, setting and positioning the machining electrode and mandrel 1 in the die-sinking electrical discharge pressurizing device, The above mandrel--
- There is a problem that each step of the electric discharge machining process for forming the ring surface 2 must be performed independently.

In addition, in the above explanation, the mandrel processing process in the extrusion die was explained, but since each of the above steps is performed independently, processing errors in each process are accumulated, and the mandrel is formed in the final process. There is also the problem that it is difficult to finish the processing precision of the mandrel hair ring surface to the desired high precision (within 10.01 mm).

For example, a similar problem occurs when machining a male shaped body such as a seated punch for a press (in particular, the desired machining accuracy is ±0.0
05 wm).

(Means for Solving the Problems) The present invention aims to solve the above-mentioned problems, and when machining a male-shaped body by electrical discharge machining, the present invention covers everything from electrode production to electrical discharge machining of the male-shaped body. The object of the present invention is to provide an electric discharge machining device that can perform automatic electrical discharge machining continuously. Therefore, the electric discharge machining apparatus of the present invention is an electric discharge machining apparatus for machining a male-shaped body by electric discharge machining, and is equipped with a wire cut electric discharge machining unit and a die-sinking electric discharge machining unit. It is equipped with a machining table commonly used for electrical discharge machining of each of the die-sinking electrical discharge machining units, and has a male-shaped body mounting portion for attaching the male-shaped body to be machined to the machining head of the die-sinking electrical discharge machining unit. and a machining electrode material attachment part for placing a machining electrode material on the machining table, and the wire cut electric discharge machining unit processes the machining electrode material placed on the machining table to form the male shape. A processing electrode having a female-shaped opening corresponding to the male-shaped body to be molded into the body is manufactured on the processing table, and the processing electrode is placed at a position corresponding to the male-shaped body. The die-sinking electric discharge machining unit is configured to use a machining electrode on the machining table to machine a male shaped body on a machining head of the die-sinking electric discharge machining unit while the machining table is moved. It is characterized by the presence of

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

FIG.
Figure (Δ) shows a plan view of the mandrel taken along arrow A-A in Figure 1, and Figure 2 (B) shows a plane view of the processing electrode 13 shown in Figure 1. The circular numbers 1 to 4 correspond to those shown in Fig. 3, 8' is the dowel pin hole, IO is the jail ball table, 10' is the force 11L tank, and 11 and 12 are the control motors. The processing table 10 is driven in the orthogonal X and Y directions, and 13 is a processing electrode (or electrode material), such as a flat plate made of copper, graphite, etc.
13' is an electrode opening, 14 is a wire electrode, 15 is a wire electrode supply roller, 16 and 11] are tension rollers, 17 is a -1 partial guide, 18 is a lower guide, 20 is a scrap roller, 21 and 22 2 is a control motor that moves the upper guide 17 in orthogonal X and Y directions and adjusts the inclination angle of the wire electrode 14;
34: i machining heel, 24 is a workpiece mounting part, 25 is a rotation control motor for electric discharge machining, 26 is a control motor for raising and lowering the machining head, and 27 is an oil pan to prevent machining fluid from flowing out during die-sinking electric discharge machining. 28 represents a control valve.

The embodiment shown in FIG. 1 is comprised of a wire electrode 14 or a control motor 22, and performs wire cut electric discharge machining using a wire cutter 1 to electric discharge machining Uniso I.
A die-sinker electric discharge pressurizing unit according to the present invention, which is constituted by a machining nozzle 23 or a control motor 26 and performs die-sinker electric discharge machining, and is configured to be driven in orthogonal X and Y directions by control motors 1 and 12. Processing table 1
Consists of 0. That is, the machining according to the embodiment shown in FIG. 1 involves machining the machining electrode 13 set on the machining table 10 using the wire-cut electrical discharge machining unit, and then driving the machining table 10 in the X and Y directions. By pressing the die-sinking electric discharge machining position,
Thereafter, the die-sinking electric discharge machining unit processes the mandrel hair ring surface 2 of the mandrel 1 using the pressure electrode 13 as a machining electrode. The electrode manufacturing, processing table movement, and machining of the mandrel hair ring surface by die-sinking electric discharge machining are continuously and automatically performed, for example, by NC control, based on a predetermined program.

Hereinafter, with reference to FIGS. 1 and 2, the manner in which a male shaped body, such as a mandrel in an extrusion die, is machined by the electric discharge machining apparatus of the present invention will be explained in detail.

First, as shown in FIGS. 1 and 2(A), the mandrel 1 to be processed is fixed to the workpiece attachment part 24 of the processing head 23, and the material of the processing electrode 13 (for example, (copper plate, graphite plate, etc.). Then, the material of the machining electrode 13 is subjected to wire-cut electrical discharge machining using the wire electrode 14 to form an electrode opening 13 as shown in FIG. 2(B) corresponding to the shape of the mandrel hair ring surface 2 of the mandrel 1 to be machined. ′
form. Next, the machining reference point O of the mandrel 1 shown in FIG. 2(A) and the electrode reference point 0'(
The processing tape 0 is moved so that it is located on the same vertical line (as shown in FIG. 2(B)). After moving the machining table 10 to a predetermined position, the mandrel hair ring surface 2 of the mandrel 1 is pressurized by die-sinking electric discharge machining using the machining electrode 13 as a machining electrode. Note that during die-sinking discharge pressurization, the lower surface of the machining table 10 is in close contact with the upper surface of the oil pan 27, and by controlling the control valve 28, the machining fluid in the machining tank 10' (not shown) is Since the liquid level is controlled, die-sinking electrical discharge machining can be performed smoothly as desired.

In this way, all processing steps from electrode production to mandrel processing can be performed continuously and automatically as described above.

In addition, as explained at the beginning of this specification, in the conventional method in which a machining electrode is manufactured using a wire-cut electrical discharge machining device, and the hollow electrode is attached to a die-sinking electrical discharge machining device to perform the mandrel carving, the above-mentioned Giant ear cutter 1 - Since the electrical discharge machining equipment and the die-sinking electrical discharge machining equipment are independent equipment, the machining power supply device, NO control device
j7 etc. are individually required for each electric discharge machining device in 1-1. However, in the present invention, the above wire cutter I-
Since the machining power supply device, NC control device, etc. used when performing electric discharge machining and die-sinking electric discharge machining can be shared, the cost of the apparatus is reduced. Furthermore, since wire-cut electrical discharge machining and die-sinking electrical discharge machining are performed using the same machining table, it is possible to automate all machining from electrode production to man-1-iron machining. This not only makes it possible to significantly improve the machining capacity.

In addition, in the embodiment shown in FIG. 1 and FIG. 2, the addition Zr and flE of the man rule in the extrusion die were explained, but the present invention is not limited to this, and for example, Needless to say, it is commonly used for machining so-called GF-type shaped bodies such as ``zai'', lfn, etc.

(Effects of the Invention) As explained above, according to the present invention, in electrical discharge machining of a Miff-shaped body, all machining steps from electrode production to completion of machining of the male-shaped body are performed continuously and automatically. It is possible to provide an electrical discharge machining apparatus that enables this.

[Brief explanation of the drawing]

FIG. 1 shows the configuration of an embodiment of the electric discharge machining apparatus of the present invention, FIG. 2(A) is a plan view of the mandrel taken along the arrow A-A shown in FIG. 1, and FIG. 2(B) shows the machining electrode 13 shown in FIG. 1. plan view of
FIGS. 3(A) and 3(B) show explanatory diagrams of the extrusion die. In the figure, 1 is a mandrel, 2 is a mandrel bearing surface, 10 is a processing table, 10' is a processing tank, 11.12.
21.22.25 and 26 are control motors, 13 is a processing electrode, 13' is an electrode opening, 14 is a wire electrode, 15 is a wire electrode supply roller, 16 and 19 are tension rollers,
17 is an upper guide, 18 is a lower guide, 20 is a scrap roller, 23 is a processing head, 24 is a work mounting part, 27 is an oil pan, and 28 is a control valve.

Claims (1)

[Claims] An electric discharge machining apparatus for machining a male-shaped body by electric discharge machining is equipped with a wire cut electric discharge machining unit and a die-sinking electric discharge machining unit, and is equipped with a wire cut electric discharge machining unit and a die-sinking electric discharge machining unit for electric discharge machining, respectively. It is equipped with a commonly used machining table, has a male shaped body mounting part for attaching the male shaped body to be machined to the machining head of the die sinking electric discharge machining unit, and also has a machining electrode material mounted on the machining table. The wire cut electric discharge machining unit processes the machining electrode material placed on the machining table to correspond to the male shape to be formed into the male shape body. A machining electrode having a female-shaped opening is manufactured on the machining table, and the machining table is moved so that the machining electrode is located at a position corresponding to the male-shaped body. An electric discharge machining apparatus characterized in that the die-sinking electric discharge machining unit is configured to perform machining on a male shaped body on a machining head of the die-sinking electric discharge machining unit using a machining electrode on the machining table.