JPH03234419A - Wire for electric discharge machining - Google Patents

Abstract

PURPOSE:To enable smooth electric discharge machining of a part difficult to machine such as a corner part of frame body to reduce work hours by forming a cross sectional shape of a wire to have at least one sharp edge part less than a right angle. CONSTITUTION:A wire 21 wound around a wire feed bobbin 1 is stretched over a damper pulley 3, a pulley 4, a brake roller 5, a wire presser 6, a support pulley 7, both guide mechanisms 10, 11, a support pulley 12, a big tail guide 13, a wire take-up roller 14 and a pinch roller 15 in sequence and carries out an electric discharge machining to a workpiece between both the guide mechanisms 10, 11. In the case where a rectangular through hole 20 is formed in a plate-like body 19, both the guide mechanism 10, 11 are synchronously turned by means of a turning control mechanism 23, and while keeping a sharp edge part 22 of the electric discharge machine wire 21 opposed to an inner peripheral surface of the through hole 20, the plate-like body 19 is moved so as to draw a rectangle against the electric discharge machining wire 21. In this way, the wire 21 forms right angles at four corners of the through hole, between both the guide mechanisms 10, 11.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an electrical discharge machining wire that is inserted between a pair of guide mechanisms disposed above and below to perform electrical discharge machining on a workpiece.

[Conventional technology]

Conventionally, as shown in FIG.
However, through the damper pulley 3 and the brake roller 5 that interlocks with the pulley 4,
117 Yuwaku - Ding WaC Yuki Gume 7 Q and is guided and supported by an upper guide mechanism 10 and a lower guide mechanism 11 equipped with a die guide 9, and both guide mechanisms 10.
While electrical discharge machining the workpiece between 11 and 11, the lower guide mechanism 1
The wire 2 exiting from the support pulley 12. Pigtail guide 13. Wire wound roller 14. It is known that wires are collected through a pinch roller 15 into a wire collection box 16. Note that reference numerals 17 and 18 in the figure indicate limit switches for detecting wire breakage.

[Problem to be solved by the invention]

By the way, in the conventional wire electric discharge machine, both the guide mechanisms 10 and 11 are in a fixed state, and the cross-sectional shape of the wire 2 is circular, so that, for example, as shown in FIG. When forming a rectangular through hole 20 in the center of the shaped body 19 to make it into a rod shape, first, a wire 2 with a large diameter is
After performing electrical discharge machining, the wire 2 is replaced with a wire 2 having a smaller diameter, and finishing machining is performed to form right angles at the four corners of the through hole 20. However, the small diameter Kui J
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There are problems in that it is necessary to slow down the machining speed, it takes a long machining time, and it is necessary to exchange wires with different diameters.

The present invention has been made in view of the above circumstances, and its purpose is to enable smooth electrical discharge machining of parts that were conventionally difficult to machine, such as corners inside the frame, and to reduce machining time. It is an object of the present invention to provide a wire for electrical discharge machining that can achieve the desired performance and eliminate the need to replace the wire.

[Means to solve the problem]

In order to achieve the above-mentioned object, the present invention provides a wire in which the cross-sectional shape of the wire includes at least one sharp point that is less than or equal to a right angle.

[Effect]

In the wire for electric discharge machining of the present invention, for example, the corner is subjected to electric discharge machining by arranging the sharp end of the cross section of the wire to face the corner in the frame, and the corner is angled.

〔Example〕

Hereinafter, the present invention will be explained in detail based on FIGS. 1 to 4.

FIG. 1 shows a first embodiment of the electric discharge machining wire 21 of the present invention.The electric discharge machining wire 21 has an equilateral triangular cross section, and each corner of the triangle has a sharp point 2.
It is said to be 2.

The electrical discharge machining wire 21 is used in a wire electrical discharge machine as shown in FIG. In this wire electric discharge machine, an upper guide mechanism 10 and a lower guide mechanism 11 are provided rotatably in a plane orthogonal to the wire feeding direction in synchronization with each other. A rotation control mechanism 23 is connected to these guide mechanisms 10 and 11 to control the direction of the electric discharge machining wire 21 guided and supported. In addition, the wire supply pobin 1. Damper pulley 3. Pulley 4. Brake roller5.
Wire presser 6. Support pulley 7, support pulley 12. Pigtail guide 13. Wire winding roller 14 and pinch roller 15. Regarding the wire collection box I6, except that it has a structure that facilitates supporting and guiding the electric discharge machining wire 21,
This is similar to the conventional example shown in FIG.

In the wire electrical discharge machine using the electrical discharge machining wire 21 configured as described above, as in the conventional case, the wire 21 wound around the wire supply bobbin 1 is as shown in FIG.
Damper pulley 3. Pulley 4 Brake roller 5. Wire presser 6. Support pulley 7° double guide mechanism 10, 11. Support pulley 12. Pigtail guide 13. Wire wound roller 14. In this case, the pinch rollers 15 are stretched in this order and the workpiece is subjected to electric discharge machining between the two guide mechanisms 10 and 11. For example, when a rectangular through hole 20 is formed in a plate-shaped body 19 as shown in FIG. In this case, by rotating both guide mechanisms to and 11 synchronously by the rotation control mechanism 23, the sharp end 22 of the electric discharge machining wire 21 is aligned with the through hole 20.
The plate-like body 19 is moved in a rectangular manner with respect to the electrical discharge machining wire 21 while facing the inner circumferential surface of the plate-like body 19 . As a result, a through hole 20 is formed by the wire 21 between both guide mechanisms 10.2, and the four corners are right-angled. 24 has a square cross-sectional shape. Further, FIG. 4 shows a third embodiment of the present invention, in which the electric discharge machining wire 25 has a teardrop-shaped cross section.

〔Effect of the invention〕

As explained above, in the present invention, since the cross-sectional shape of the wire is provided with at least one sharpened part that is less than or equal to a right angle, the workpiece can be electrically discharged by facing the sharpened part to the workpiece. By setting the angle, it is possible to smoothly perform electric discharge machining on areas that were previously difficult to machine, such as the corners inside the frame, reducing machining time and making it easier to replace the wire. It has an excellent effect in that it is not necessary.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a first embodiment of the present invention, FIG. 2 is a schematic configuration diagram showing an example of a wire electrical discharge machine using the wire for electrical discharge machining of the present invention, and FIG. 3 is a third embodiment of the present invention. FIG. 5 is a schematic configuration diagram showing a conventional wire electric discharge machine, and FIG. 6 is an explanatory diagram showing an example of a workpiece. IO... Upper guide mechanism, 11... Lower guide mechanism, one... Plate-shaped body (work), 21... Wire for electric discharge machining, 22... Pointed part, 24.25... Wire for electrical discharge machining.

Claims (1)

[Claims] What is claimed is: 1. A wire for electrical discharge machining that electrically discharges a workpiece while being guided by a guide mechanism, the wire having a cross-sectional shape including at least one sharp point that is less than or equal to a right angle.