JPS6239123A - Electric discharge machine - Google Patents

Abstract

PURPOSE:To enable smooth machining to be stably performed for a long time, by providing a nozzle, which envelops a wire electrode guide structure to supply machining fluid to a wire electrode turn back part, so as to easily remove machining chips and prevent a wire electrode from breaking. CONSTITUTION:A machine, turning a motor 21, collects a wire electrode 23 from a wire electrode supplying drum 3 to a wire electrode collecting drum 4 via guide rollers 6, 14, wire electrode insertion hole 16a, turn back part of a wire electrode guide structure 17, wire electrode insertion hole 16b and guide rollers 15, 8. Here the machine applies machining voltage pulse to the wire electrode 23 and a workpiece 24 while supplies machining fluid into a machining fluid supply nozzle 16. The device, allowing this machining fluid to flow in a horizontal fine machining gap part where the wire electrode 23 passing through the electrode turn back part of the wire electrode guide structure 17 performs machining, enables smooth machining to be performed over a long time.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to electrical discharge machining equipment.

[Conventional technology]

There is a known electric discharge machining apparatus of the type that is equipped with a wire electrode guide having an electrode folded part formed at the tip thereof, and a supplied wire electrode is guided back to the supply side via the wire electrode folded part and recovered. Yes, it is becoming widely used.

In this type of pre-discharge device, machining is performed by the wire electrode passing through the electrode folded portion of the wire electrode guide, so that the electrode is not substantially consumed during machining, and extremely economical machining is possible.

However, in the above electric discharge machining equipment, a machining fluid supply nozzle was used to remove machining debris in the micromachined gap between the wire electrode and the workpiece, but the conventional machining fluid supply nozzle The supply of machining fluid into the machining gap becomes insufficient,
There was a problem in that during machining, air discharge often occurred and the wire electrode broke. Additionally, there are some machines that perform machining with the machining gap immersed in machining liquid, but machining debris is not removed sufficiently and machining cannot proceed stably and smoothly as in the case of conventional full-type electrodes. was there.

[Problems to be solved by the present invention]

The present invention has been developed from the perspective of paper, and its purpose is to sufficiently supply machining liquid to the horizontal micromachining gap between the electrode folded part of the wire electrode guide and the workpiece. Another object of the present invention is to provide an electrical discharge machining apparatus that can completely prevent aerial discharge and perform smooth machining stably over a long period of time.

[Means for solving problems]

SUMMARY OF THE INVENTION It is therefore an object of the present invention to supply and guide a wire electrode along a guide path defined by a rotatably supported electrode guide, and to rotate the electrode guide together with the guided wire electrode. A wire electrode is placed opposite the workpiece across a small machining gap, machining fluid is supplied into the machining gap, and machining voltage pulses and relative machining feed are applied between the wire electrode and the workpiece. This can be achieved by providing a nozzle that covers the electric bridge guide and supplies machining fluid to the folded part of the electrode in an electric discharge machining apparatus that performs electric discharge machining on a workpiece.

[Function] By configuring it as shown in the paper, machining fluid can be sufficiently supplied to the horizontal micromachining gap between the electrode folded part and the workpiece.
Since machining waste can be easily removed, wire breakage can be completely prevented, and smooth machining can be performed stably over a long period of time.

〔Example〕

Hereinafter, the details of the present invention will be specifically explained with reference to the drawings.

FIG. 1 is an explanatory diagram showing one embodiment of the electrical discharge machining apparatus according to the present invention, and FIGS. 2 and 3 are an enlarged sectional view and a bottom view of the machining fluid supply nozzle at the tip of the wire electrode guide. It is.

In FIGS. 1 to 3, 1 is an electric discharge machining apparatus according to the present invention, 2 is a rod, 3 is a wire electrode supply drum, 4 is a wire electrode collection drum, 5 is a guide roller 6 and 8, and a brake roller 7. , capstan 10, and pinch roller 9
and a roller support arm 12 that rotatably supports 11 and 11.
13 is a chunk, 13 is a wire electrode guide holding rod supported by the chuck 12, 14 and 15 are guide rollers, and 16 is attached to the wire electrode guide holding rod 13 and surrounds the wire electrode guide holding rod 13. A nozzle 17 for supplying the machining fluid is held in the machining fluid supply nozzle 16 by the screw 18.
．． 18 is a wire electrode guide attached, 19 is a hose joint attached to the machining fluid supply nozzle 16, 20 is a hose attached to the hose joint 19 and supplies machining fluid into the machining fluid supply nozzle 16, 21 is rod 2
21a is the output shaft of the rotation motor 21, 22 is a coupling, 24 is a wire electrode, 24 is a workpiece, 2 is a cross slide table,
28 is the motor for moving the cross slide table 25 in the X-axis direction, the nail is the motor for moving the cross slide table 25 in the Y-axis direction, and 28 is the wire electrode side attached to the processing head, column, arm, etc. 4 is a Z-axis lifting motor that moves the device up and down; 4 is the X-axis moving motor 26; Y-axis moving motor 27; Z-axis elevation morph 28
and an NC device that controls the rotation motor 21 according to a predetermined program.

The rod 2 is connected to an output shaft 21a of a rotary motor 21 via a coupling 22, and a wire electrode guide holding rod 13 is supported on the rod 2 via a chuck 12. together with guide rollers 6 and 8,
A roller support arm 5 rotatably supports the brake roller 7, capstan 10, and pinch rollers 9 and 11.
, wire electrode supply drum 3 and wire electrode collection drum 4
etc. are attached, and the loft 2 is connected to the rotation motor 2.
It is configured to rotate with the rotation of 1.

Thus, the wire electrode supply drum 3 and the wire electrode collection drum 4 are arranged coaxially and close to each other, and each guide roller 6 and 8, brake roller 9, capstan 10, and pinch roller 9 and 11 and the like are collectively held by the roller support arm 5, and the wire electrode 23 pulled out from the wire electrode supply drum 3 passes from the guide roller 6, between the brake roller 7 and the pinch roller 9, and through the guide roller 14. The wire electrode guide 1 passes through the wire electrode insertion hole 16a of the machining fluid supply nozzle 16.
7, passes through the wire electrode insertion hole 26b of the machining fluid supply nozzle 16, then passes from the guide roller 15 between the capstan 10 and the pinch roller 11, passes through the guide roller 8, and collects the wire electrode. It is collected in the drum 4.

The wire electrode guide 17 surrounds the electrode guide 17 except for the electrode folded part at the tip, and is attached with a machining fluid supply nozzle 16 that supplies machining fluid to the electrode folded part. A hose joint 19 and a hose 20 are attached, and machining fluid is supplied into the machining fluid supply nozzle 16 via the hose 20.

The NC device 29 is an X-axis moving motor 26 and an X-axis moving motor 27 of the cross slide table 5 on which the workpiece 24 is placed.
, the Z-axis lift motor 28 and rotation motor 21 on the wire electrode 23 side are controlled according to a predetermined program.

During electrical discharge machining, a machining voltage pulse is applied to the wire electrode 23 and the workpiece 24 from a power supply circuit (not shown) via a current-carrying roller or an electrode guide, and at the same time,
Machining fluid is supplied into the machining fluid supply nozzle 16 through the hose 20 so as to surround the wire electrode guide 17, and machining the wire electrode 23 passing through the electrode folded portion of the wire electrode guide 17. Since the machining is carried out with sufficient supply to the horizontal micro-machining gap, smooth machining can be performed stably over a long period of time.

〔Effect of the invention〕

Since the present invention is configured as shown in the paper, according to the present invention, machining liquid can be sufficiently supplied to the horizontal micromachining gap between the electrode folded part of the wire electrode guide and the workpiece, and machining debris can be removed. Therefore, it is possible to provide an electric discharge machining apparatus that can easily and stably perform smooth machining over a long period of time.

It should be noted that the configuration of the present invention is not limited to the embodiments described on paper; for example, the machining fluid supply nozzle 16 is attached to the wire electrode guide holding rod 13, and the wire electrode guide body 17 is attached to the machining fluid supply nozzle 16. However, the wire electrode guide holding rod 13 may be protruded into the machining fluid supply nozzle I6 to provide a slit, and the wire electrode guide 17 may be attached to the slit.
The shape, mounting position, mounting method, etc. of the machining fluid supply nozzle 16 etc. can be freely changed within the scope of the purpose of the present invention, and the present invention encompasses all of them. .

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is an explanatory diagram showing an embodiment of the electrical discharge machining apparatus according to the present invention, and FIGS. 2 and 3 are machining fluid supply nozzles at the tip of the wire electrode guide. FIG. 2 is an enlarged cross-sectional view and a bottom view of FIG.

Claims (1)

[Scope of Claims] A wire electrode is supplied and guided along a guide path defined by a rotatably supported electrode guide, and the electrode guide is rotated together with the guided wire electrode. A wire electrode is placed opposite the workpiece across a machining gap, a machining liquid is supplied into the machining gap, a machining voltage pulse and a relative machining feed are applied between the wire electrode and the workpiece, and the workpiece is The electric discharge machining apparatus described above is characterized in that the electric discharge machining apparatus is provided with a nozzle that includes an electrode guide and supplies machining fluid to the folded part of the electrode.