JPS60232825A - Wire cut machining - Google Patents

Abstract

PURPOSE:To obtain positive machining with high precision in wire cut discharging machining or wire cut electrolytic machining by placing a plurality of workpieces in close contact through conductive thin films. CONSTITUTION:Conductive paste 6 is applied in a thin film to overlapping surfaces of a plurality of workpieces 5... of metal flat plates, and then the workpieces 5... are laid one above another. The workpieces 5... placed in layers are pressedly held by, for example, a clamping jig so as to be fixed as a unit. Then, the workpieces 5... are fixedlyh mounted to a predetermined location of a workpiece feeder in a wire cut discharging machine. And, a wire electrode 7 is inserted through a hole H preliminarily formed. With working fluid supplied from a working fluid circulating device along the electrode 7 moving in the direction of arrow A, the workpieces 5... are sent in the direction of arrow B for wire cut discharging machining. This method permits positive machining with high precision.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a wire cutting method for processing workpieces in a stacked manner.

[Technical background of the invention and its problems]

Recently, wire electrical discharge machining is used for example in the production of molds.

It is used in a wide range of applications, including parts processing. This wire electrical discharge machining involves winding up a thin wire made of copper, tungsten, molybdenum, etc., and using this as an electrode, a two-dimensional contour shape is fed through numerical control to create a 17-year experience for soldiers. Because it can process any complex contour shape with high precision and efficiency, it is easy to shorten product delivery times and lower prices.

By the way, in this electrical discharge machining, workpieces are overlapped and simultaneously machined mainly for the purpose of cost reduction. for example.

Two pieces of mold material are stacked one on top of the other, and the punch and die are simultaneously ejected by wire electrical discharge machining. However, in the case of such overlapping processing, microscopic gaps, which are insulating layers, are created between the overlapping parts of the respective materials. Therefore, as shown in Figure 1, each material (1),
A potential difference occurs between the materials (1) and (2), and the discharge characteristics between the materials (1) and (2) and the wire electrode (3) differ. Therefore, the amount of machining is different for each material (1) and (2) where a potential difference occurs.Differences in dimension occur between the two materials, for example, the inner diameter of through holes (3) and (4) cannot be uniformly machined. This is causing a problem that cannot be done. Moreover.

1-f to prevent disconnection of the shear wire electrode due to abnormal discharge caused by air or chips remaining in the gap.
f Wakataki and Toki Dan are not included in Rudoi 1 Hakki - [Object of the Invention] The present invention has been made by paying attention to the above-mentioned circumstances.

It is an object of the present invention to provide a wire cut machining method that can perform electric discharge machining with high precision even when workpieces are overlapped and subjected to electrical discharge machining.

[Summary of the invention]

Multiple workpieces are brought into close contact via a conductive thin film.

Wire cut electrical discharge machining or wire cut electrolytic machining is performed using a wire electrode.

[Embodiments of the invention]

An embodiment of the present invention will be described below in detail with reference to the drawings.

As shown in FIG. 2, a plurality of workpieces (5) made of flat metal plates are overlapped. At this time, a conductive paste (6) having a thickness of several μm or less is interposed between each of the wave force blowing works (5). That is, the workpiece (5)
A thin film of conductive paste (6) is applied to the overlapping surfaces of the workpieces (5), and then the workpieces (5) are superimposed on each other. As for this conductive paste (6), for example, a paste mixed with iron powder to impart conductivity is suitable. However, one workpiece (5) is overlapped...
・For example, use a clamp jig (not shown) to clamp and secure the parts together. Next, the workpieces (5) are fixed at a predetermined position of a workpiece feeder 9 (not shown) of a wire-cut electrical discharge machine. Next, the wire electrode (force) is inserted into the hole (H) that has been drilled in advance.The machining fluid circulation device then moves the machining fluid in the four directions of the arrows along the wire electrode (7). While feeding, the workpieces (5) overlapped by the workpiece feeding device are moved by the arrow (B).
) direction and wire-cut electrical discharge machining is performed at the same time to form the desired through hole.

In this case, the workpiece (5)... is a conductive paste (
6) Because they are completely integrated in terms of potential via...

There is no potential difference at all on the contact surfaces of each workpiece (5). Therefore, the wire electrode (7) and the workpiece (5)
The degree of discharge marks formed on the inner wall surface of the workpiece (5) due to the electric discharge between the workpieces (5) and...
...and it becomes equal. In other words, each workpiece (5)
... There is no difference in the amount of electrical discharge machining between the two, and uniform machining can be performed, resulting in a machined surface with uniform surface roughness. Moreover, the electrode consumption ratio of the wire electrode (7) remains constant during machining, and since the voids are filled, air and chips do not accumulate, and there is no abnormal electrical discharge phenomenon. Accidents can be prevented.

In place of the conductive paste, a conductive paint such as Dotite (trade name, manufactured by Fujikura Kasei Co., Ltd.) may be used. One more thing about this invention.

It can be applied not only to wire-cut electrical discharge machining but also to wire-cut electrolytic machining that does not involve electrical discharge.

Furthermore, the workpieces do not need to be stacked in the direction of the wire electrode.

〔Effect of the invention〕

The wire cut processing method of the present invention can perform uniform processing even when workpieces are overlapped and processed simultaneously, and a processed surface with uniform surface roughness can be obtained. 9. The electrode consumption ratio of the winding and wire electrodes is constant. 1, 1, 1, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 4, 5, 1, , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , 1 , 1 , , , , , , , , , , , , 1, , , , , , , , , , , , , 1 , , , 1, , , , , , , , , and 1, , and 10, respectively, are soldered;

Wire electrode disconnection accidents can be prevented.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view showing the occurrence of dimensional errors when overlapping workpieces are simultaneously machined by wire-cut electric discharge machining, and Fig. 2 is a cross-sectional view illustrating the wire-cut machining method according to an embodiment of the present invention. It is a diagram. (5): Workpiece. (6): Conductive paste (conductive thin film). (7): Wire electrode. Agent: Patent attorney Kensuke Chika (and 1 other person)

Claims (1)

[Claims] A method in which a plurality of workpieces are brought into close contact with each other via a conductive thin film, and a current is conducted between the plurality of workpieces in close contact with a wire electrode in a non-contact state to simultaneously work on the plurality of workpieces. A wire cut processing method comprising: