JPS60186323A - Wire guide apparatus for wire-cut electrical discharge machine - Google Patents

Abstract

PURPOSE:To rapidly repair the disconnection of an electrode by folding-up a multistage nest-type outer cylinder and projecting a guide pipe erected at the center of a wire guide body from the top edge of a working-liquid feeding nozzle, thus facilitating the insertion of an electrode wire. CONSTITUTION:A wire guide apparatus 40 is equipped with a wire guide body 44 fixed at the center of a base seat 42, and a working-liquid feeding nozzle 46 fixed onto the seat base 42 so as to cover the wire guide body 44. A guide hole 50 for the insertion of an electrode wire 22 is formed onto a guide pipe 48 erected at the center part of the wire guide body 44, and a jewel die 52 is buried in the vicinity of the top edge, and the die guide for the electrode wire 22 is formed. A water pass hole 54 for introducing working liquid is formed onto the wire guide body 44 and the base seat 42, and the working liquid flows-out into an inner chamber 56 through the water pass hole 54 and jets-out from the center port 60 of a working-liquid injection pipe 58. The working-liquid injection pipe 58 is screwed in adjustable ways in the vertical direction at the top edge of the outer cylinder 62 of the working-liquid feeding nozzle 46.

Description

Detailed Description of the Invention Technical Field The present invention relates to a wire-cut electric discharge machine, and in particular to an improvement in upper and lower wire guide devices that guide an electrode wire to an electric discharge machining section of a workpiece material and have machining fluid supply nozzles. Regarding structure.

In the conventional wire electrical discharge machine, the electrode wire is wound from the supply reel onto the take-up roller through the brake drum for tension setting, the guide roller, the upper and lower heads, the motor-driven wind-up roller, etc., and during this time the above-mentioned upper and lower A configuration is adopted in which electrical discharge machining progresses between the electrode wire running between the lower heads and the workpiece on the XXY direction moving table. The apparatus is provided with upper and lower wire guide devices equipped with upper and lower wire guides and a machining fluid supply nozzle in order to cause the electrode wire to run straight in close proximity to the workpiece material. In particular, the machining fluid supply nozzle, which is installed for the purpose of cooling the electrode wire and removing machining debris, is installed very close to the workpiece material as the electrical discharge machining speed tends to increase in recent years, and the machining fluid is ejected at a relatively high pressure. For example, a configuration is adopted in which the pressure is maintained at a high pressure value of 5 atmospheres or more. However, since an extremely thin conductive wire is used for the electrode wire, it is inevitable that the electrode wire will break in the electrical discharge machining section, and when such a break occurs, the electrical connection wire must be re-inserted through the wire guide. Repair work is required to repair. Therefore, there is a need to simplify the careful repair work of inserting such thin wire-shaped electrode wires into the upper and lower wire guides, and to be able to quickly restart the electrical discharge machining work upon completion of the repair work.

SUMMARY OF THE INVENTION In order to meet the above-mentioned demands, an object of the present invention is to retract the machining liquid nozzle, which is provided close to the workpiece material, to a certain retracted position for repair work when repairing the electrode wire, and to move the electrode wire to the wire guide. It is an object of the present invention to provide a wire guide device having a receptacle and shape structure that allows the machining fluid supply nozzle to be returned to a certain optimal machining position close to the workpiece material when the wire guide device is inserted and the repair is completed. .

That is, according to the present invention, in a wire-cut electrical discharge machine that performs electrical discharge machining of a workpiece material using an electrode wire running between upper and lower wire guide devices, a wire guide main body through which the electrode wire is inserted; A machining fluid supply nozzle is formed by attaching a machining fluid ejection pipe to the tip of a multistage container-shaped outer cylinder attached around the wire guide main body, and the multistage container and the inside of the shape external cylinder are pressurized. A wire guide device for a wire-cut electrical discharge machine is provided, which is characterized in that it pumps liquid. According to this configuration, when a breakage of the electrode wire occurs in the electrical discharge machining section, the multi-stage insert-shaped outer tube is folded up and the upright guide tube formed in the center of the wire guide body is moved outward from the tip of the machining fluid supply nozzle. If the electrode wire 7 is protruded from the wire guide body, the repair work can be simplified because the electrode wire 7 can be easily removed from the wire guide body, and when the repair is completed, the electrical discharge machining work can be resumed by simply extending the multi-stage telescopic outer cylinder again. It is possible. Hereinafter, the present invention will be described in detail based on embodiments shown in the accompanying drawings.

Embodiment FIG. 1 is a schematic mechanical diagram showing the general configuration of a wire-cut electric discharge machine equipped with a wire guide device of the present invention, and FIGS. 2 and 3 show the structure of a wire guide device according to an embodiment of the present invention. FIG.

First, in FIG. 1, the wire-cut electrical discharge machine has a column 10 that stands upward from a machine stand (not shown), and a movable table 12 that can be controlled and moved in both the XX and Y axes directions on the machine stand. It is equipped with. Also column 10
The arm 14 that protrudes in the direction from the top faces the inside of the movable table 12 and is located below a workpiece W (hereinafter referred to as a work) placed on the movable table 12. A guide roller 1 is attached to the tip of the arm 14.
6 and a lower head 18, and a guide device 20, which will be described later, is attached to the lower head 18. On the other hand, on the column 10 there is a supply reel 24 for the electrode wire 22, a brake device 26, guide rollers 28, 30, . A wire winding device 32, a winding device 34, and an upper head 36 are provided, and the upper head 36 is provided above the work W. The electrode wire 22 is connected to the wire winding device 3
It travels from the supply reel 24 to the take-up device 34 with a winding force of 20, and at this time, it travels while maintaining a substantially constant tension state at all times due to the braking action of the brake device 26. The electrode wire 22 running from the lower head 18 to the upper head 36 is connected to the workpiece W via a power supply (not shown in FIG. 1) provided on either the upper or lower head. Electric discharge power is supplied from the workpiece W, and electric discharge machining progresses between the workpiece W and the electrode wire 22 facing each other through a small gap. In the above-described configuration, the upper and lower wire guide devices 2
0.38 are each equipped with a wire guide and a machining fluid supply nozzle, and below, an embodiment of the wire guide device according to the present invention will be described.

FIG. 2 shows a longitudinal sectional view of a wire guide device according to an embodiment of the present invention, in which the device 4o includes a wire guide body 44 fixed to the center of a pedestal 42, and a wire guide body 440 that can be broken. The wire guide main body 44 is completely equipped with a machining fluid supply nozzle 46 fixed to the pedestal 42 using fixing means such as screws. 48, a pore-shaped guide hole 50 through which the electrode wire 22 is inserted is formed in the guide tube 48, and a gemstone die 52 is buried near the tip of the guide hole 50.
It forms a die guide for the f-wire 22. Needless to say, as shown in the figure, a hole is formed in the base 42 through which the wire communicates with the guide hole 50 of the id main body 44. A water channel hole 54 for introducing machining fluid from the outside is also formed in the wire side body 44 and the pedestal 42, and the machining fluid introduced from the outside under a desired pressure flows through the water channel hole 5.
4 into the inner chamber 56 of the machining fluid supply nozzle 46, and then jetted out from the central nozzle 60 of the machining fluid spouting pipe 58. The machining fluid spouting pipe 58 is used for the workpiece W (Fig. 1) during electrical discharge machining.
The pressurized machining fluid is ejected from the center nozzle 60 to the electrical discharge machining section.
The machining fluid spouting pipe 58 is made of an insulating material such as a plastic material so as not to adversely affect the electrical discharge machining action between the workpiece W and the machining fluid supply nozzle 46.
is attached to the tip of the outer cylinder 62 by threaded engagement, and by adjusting this threaded engagement part, the gap between the upper or lower surface of the workpiece W and the top surface of the machining fluid spouting pipe 58 can be finely adjusted. It looks like this.

On the other hand, as clearly shown in FIG. 2, the outer cylinder 62 is formed in the shape of a plurality of tiered telescopic members, and thus has a structure that can be freely folded or stretched. During electrical discharge machining, the pressurized machining fluid flows out from the channel hole 54 of the wire guide body 44 into the chamber 56, and the outer cylinder 62 maintains its maximum elongated state because it receives the pressure. When a break in the electrode wire 22 occurs during electrical discharge machining, the machining fluid supply is stopped and the telescope-shaped outer cylinder 62 is folded up so that the upright guide tube 48 of the wire guide 44 can be moved to the third position. As shown in the figure, the machining fluid jet pipe 5
Since the electrode wire 22 is in a state of protruding outward from the central nozzle 60 of the electrode 8, the repair work of inserting the electrode wire 22 into the fine-shaped guide hole 50 again can be performed simply and easily. Of course, the length of the upright guide tube 48 and the amount of expansion and contraction of the outer cylinder 62 may be selected and designed in advance so as to obtain the above-mentioned protruding state.

After the repair of the electrode wire 22 is completed, by restarting the pressurized supply of machining fluid, the outer cylinder 62 is expanded again and the gap between the workpiece W and the tip of the machining fluid spouting pipe 58 is kept constant. Since it returns to its position, it is possible to immediately begin the electrical discharge machining operation. The pedestal 42 is used to attach the wire guide device 40 of the present invention to the upper and lower heads 36 or 18 shown in FIG. 1 to form the upper wire guide device 38 or the lower wire guide device 20.

[Brief explanation of the drawing]

FIG. 1 is a mechanical diagram of a wire-cut electric discharge machine equipped with a wire guide device according to the present invention, FIG. 2 is a longitudinal sectional view of a wire guide device according to an embodiment of the present invention, and FIG. 3 is an outer cylinder of the same device. FIG. 40... wire guide device, 42... pedestal, 44...
...Wire guide body, 46...Machining fluid supply nozzle,
48... Upright guide pipe, 58... Machining fluid ejection pipe, 6
2...Multi-stage storage and external cylinder. Fig. 1 32 Fig. 2 2 Fig. 3 152-

Claims (1)

[Scope of Claims] 1. In a wire-cut electric discharge machine that performs electric discharge machining of a workpiece material by an electrode wire running between upper and lower wire guide devices, a wire guide body through which the electrode wire is inserted; A machining fluid supply nozzle is formed by attaching a machining fluid ejection pipe to the tip of a multi-stage telescopic outer cylinder that is attached around the wire guide body, and the machining fluid supply nozzle is configured to apply pressure inside the multi-stage telescopic external cylinder. A wire guide device for a wire-cut electrical discharge machine, characterized in that it is configured to feed liquid under pressure. 2. In the wire guide device according to claim 1, the wire guide main body has an upright guide tube in the center, and when the multi-stage insertion of the machining fluid supply nozzle and the shaped outer cylinder are folded, A wire guide device for a wire-cut electrical discharge machine, which is formed to protrude from the machining fluid spouting pipe. 3. In the wire guide device according to claim 1 or 2, the machining liquid jetting pipe is threadedly engaged with the tip of the multi-stage telescopic outer cylinder so as to be freely adjustable up and down. Wire guide device for wire cut electric discharge machine.