WO1985003895A1

WO1985003895A1 - Wire electrode guide for electrospark machining apparatuses

Info

Publication number: WO1985003895A1
Application number: PCT/JP1985/000104
Authority: WO
Inventors: Haruki Obara; Toshiyuki Aso; Hiroshi Kinoshita
Original assignee: Fanuc Ltd
Priority date: 1984-03-02
Filing date: 1985-03-02
Publication date: 1985-09-12
Also published as: JPS60186324A

Abstract

In an electrospark machining apparatus using a wire electrode (22), at least a lower wire electrode guide unit out of upper and lower wire electrode guide units (38, 20) which have machining liquid supply nozzles is provided with an outer cylindrical structure (60), which has a machining liquid ejection tube (62) fitted around a wire electrode guide unit body (44), and which is movable between two positions, i.e. a machining position, in which the outer cylindrical structure (60) engages a positioning groove (54) in the outer circumferential surface of the wire electrode guide unit body (44) to approach a workpiece W, and a wire electrode-repairing position, in which the outer cylindrical structure (60) disengages from the positioning groove (54) to move away from the workpiece W.

Description

Specification

Title of invention

Wire electrode guide device for electric discharge machine

Technical field

The present invention relates to an electric discharge machine using a wire electrode, and more particularly to a modification of an upper and lower wire electrode guide device which guides the wire electrode to an electric discharge machining portion of a workpiece and has a working fluid supply nozzle. Regarding good structure.

Background art

In an electric discharge machine using wire electrodes, the wire electrode is wound from a supplied reel through a tension drum, guide roller, upper and lower heads, a motor driven winding roller, etc. It is wound up and during this time, the electric discharge machining is performed between the wire electrode traveling between the above-mentioned upper and lower heads and the work on the X and Y direction moving table. Each of the heads provided above and below the above-mentioned moving table is provided with a wire electrode that allows the wire electrode to travel in a straight line in close proximity to the material to be processed, and an upper-lower wire electrode guide and a working fluid supply. An upper and lower wire electrode guide device equipped with a nozzle is provided. In particular, the machining fluid supply nozzle, which is provided for the purpose of cooling the wire electrode and removing the machining debris, is provided very close to the workpiece material as the electric discharge machining speed tends to increase in recent years. A configuration is adopted in which a high ejection pressure is maintained at a high pressure value, for example, 5 atm or more. However, since extremely thin conductive wires are used for the wire electrode, it is unlikely that the wire electrode will be cut in the electric discharge machining part. It is unavoidable, and if such a disconnection occurs, it is necessary to perform a repairing operation to restore the wire electrode through the wire electrode guide again. Therefore, it is possible to simplify the complicated repair work of passing such a thin wire-shaped electrode through the upper and lower wire electrode guides, and to quickly resume the electric discharge machining work after the repair work is completed. C Disclosure of invention

An object of the present invention is to remedy the above-mentioned demands, when repairing a wire electrode, retract a working fluid supply nozzle provided close to a material to be added to a predetermined retreat position for repair work, and replace the wire electrode. When the repair is completed by passing through the guide electrode guide, the guide electrode has a structure that allows the working fluid supply nozzle to return to a certain optimum processing position close to the workpiece. 'We will not provide equipment.

According to the present invention, the electric discharge machining for performing the electric discharge machining of the material to be processed by the wire electrodes running between the upper and lower wire guide devices having the working fluid supply nozzle and the wire electrode guide. The machining fluid supply nozzle is fitted on a wire electrode guide main body, has a machining fluid ejection pipe at one end, and has a positioning groove formed on the peripheral surface of the wire electrode guide main body. The outer cylinder structure is movable between two positions, namely, a processing position where it is engaged with the work material and approaches the work material, and a wire electrode repair position where the work electrode detaches from the positioning groove and moves away from the work material. Provided is a wire electrode guide device for an electric discharge machine formed by a body. That is, the working fluid supply nozzle has an outer cylindrical body fitted to the electrode guide body, and by moving the outer cylindrical body between two positions, the wire electrode is formed. When cutting occurs, the working fluid supply nozzle is retracted, and the wire electrode can be relatively easily inserted into the wire insertion hole of the wire guide body.

Brief description of drawings

FIG. 1 is a mechanical diagram of an electric discharge machine equipped with a wire electrode guide device according to the present invention, FIG. 2 is a longitudinal sectional view of the wire electrode guide device according to an embodiment of the present invention, and FIG. FIG. 4 is a perspective view of a wire electrode guide body of the apparatus, and FIG. 4 is a perspective view of a machining fluid supply nozzle of the apparatus.

BEST MODE FOR CARRYING OUT THE INVENTION

First, in Fig. 1, the discharge force I? The machine is equipped with a column 10 standing upward from a machine (not shown) and a movable table 12 that can be controlled in both X and Y axes on the machine. are doing. Further, the arm 14 projecting laterally from the column 10 has its tip facing the inside of the moving table 12, and the material W (hereinafter referred to as “work”) W set on the moving table 12. It is located below. A guide roller 16 and a lower head 18 are provided at the tip of the arm 14, and a wire electrode guide device 20, which will be described later, is attached to the lower head 18. On the other hand, on the column i 0, the supply rail 24 of the wire electrode 22, the brake device 26, the guide rollers 28, 30, the hoisting device 32, the winding device 34, and the upward A head 36 is provided, and the upper head 3.6 is located above the work W and is provided so as to be vertically movable. The wire electrode 22 is taken up from the supply reel 24 by the winding gear of the winding device 32. In this case, the vehicle travels while maintaining a substantially constant tension state by the braking action of the brake device 26 at this time. The wire electrode 22 running from the lower head 18 to the upper head 36 is connected to a power supply (not shown in FIG. 1) provided at either the upper or lower head. Discharge power is supplied from a discharge power supply to the work W, and electric discharge machining proceeds between the work W and the wire electrode 22 opposed to the work W via a minute gap. In the above-described configuration, the upper and lower wire electrode guide devices 20 and 38 are provided with a wire electrode guide and a working fluid supply nozzle, respectively. An example of the electrode guide device will be described. ,.

FIG. 2 is a longitudinal sectional view of a wire electrode guide device according to an embodiment of the present invention. The wire electrode guide body 44 fixed to a base 42 of the wire electrode guide device 40, It is provided with a machining fluid supply nozzle 46 slidably attached to the electrode guide 44. In this embodiment, the wire electrode guide body 44 includes the wire electrode 22. There is a guide hole 48 in the shape of a pore through which a hole is inserted, a water passage hole 50 for introducing a working fluid from the outside, and a well-known stone die 52 near the upper end of the guide hole 48. are doing. The pedestal 42 is used for attaching the wire electrode guide device 40 to the above-described upper and lower heads 18 and 36, but is not necessarily a necessary component. Further, the wire electrode guide body 44 has an annular lateral groove 54 described later on its peripheral surface and one or several vertical grooves 56 extending downward with one end communicating with the annular lateral groove 54. Has been established. On the other hand, the working fluid supply nozzle 46 is composed of an outer cylinder 60 having a sliding bearing metal 58 and an insulating material which is attached to the top of the outer cylinder 60 so as to be adjustable up and down by screw engagement. And a working fluid ejection pipe 62 made of stainless steel. FIG. 2 shows the position when the wire electrode guide device is used as the lower wire electrode guide device 20 shown in FIG. 1, and the upper wire electrode guide device shown in FIG. 1 is used. When it is used as a head device 38, it should be understood that it can be attached to the upper head 36 (FIG. 1) by turning the upper and lower parts upside down from the state shown in FIG.

FIG. 2 shows the position of the machining fluid supply nozzle 46 during the electric discharge machining, and the claw 64 provided at the lower end of the outer cylinder 60 is provided with the above-mentioned wire electrode guide body 44. It engages with the annular lateral groove 5. At this time, the machining fluid introduced from the outside receives pressure and blows out from the water passage hole 50 into the outer cylindrical body 60, and further blows out from the working fluid blow-out pipe 62 to the electric discharge machining portion of the work W, and is discharged. Cools the electrode 22 and removes processing waste. At this time, the outer cylinder body 60 receives the hydraulic pressure of the working fluid, and the claws 64 are pressed into engagement with the upper surface 54 a of the annular lateral groove 54 of the wire electrode guide body 44. The positioning effect of the outer cylinder 60 and the Kaloe liquid ejection tube 62 with respect to the wire electrode guide body 44 can be obtained. In other words, the gap between the upper surface of the machining fluid spout 62 and the lower surface of the workpiece W is always maintained at a constant level while the machining fluid is being supplied. Since the liquid ejection pipe 62 is threadedly engaged with the outer cylinder 6Q as described above, the machining liquid ejection pipe 62 is connected to the outer cylinder 60 when the gap is adjusted in advance. Fine adjustment is possible by screwing It works.

On the other hand, when the disconnection of the electrode occurs in the electric discharge machining part of the workpiece W, the outer cylinder 60 of the machining fluid supply nozzle 46 and the machining fluid ejection pipe 62 are both moved down (FIG. 2). The upper end of the wire electrode guide body 44 protrudes, facilitating the repair work of inserting the wire electrode 22 again into the guide hole 48. However, the machining fluid supply nozzle arrested above The downward movement of 4 6 is performed by turning the claw 64 of the outer cylindrical body S 0 away from the rectangular horizontal groove 54 of the wire electrode guide body 44 and sliding downward along the vertical groove 56. Is achieved. Here, referring to FIGS. 3 and 4 which are perspective views of the wire electrode guide body 44 and the working fluid supply nozzle 46, the annular groove 54, the vertical groove 56 and the claw S described above are used. Songo, the withdrawal structure can be easily understood. The bearing 58 removes the so-called backlash between the wire electrode guide main body 44 and the outer cylindrical body 60 so that a constant machining fluid is supplied from the machining fluid nozzle 46 to the electric discharge machining portion. As well as providing smooth guidance for up / down movement of the cylinder 60.

When the repair is completed by inserting the wire electrode 22 into the guide hole 48 of the wire electrode guide body 44, the claw 64 of the cylindrical body 60 is moved up again along the vertical groove 56, and the repair is completed. Next, if the pawl 64 is rotated in the annular groove 54 to engage the claw 64 with the lateral groove 54, the machining fluid ejection pipe 62 immediately reaches the machining position close to the workpiece W, so that the discharge application is restarted. Will be able to

As is apparent from the above description, the wire electrode guide device according to the present invention uses a working fluid supply nozzle when repairing the wire electrode. It is possible to easily retreat from the machining position to the trapping station, and after the repair is completed, immediately return to the machining position and resume electric discharge machining. In addition, the gap between the machining fluid nozzle and the workpiece is always kept constant before and after the repair work, so that the ejection of the machining fluid is always kept at a constant pressure, which can contribute to maintaining a high level of EDM accuracy. It is. Although the above description relates to the lower guide device, it is easily understood that the same function and effect can be obtained by using the lower guide device.

Claims

The scope of the claims "

1. An electric discharge machine which has a machining fluid supply nozzle and performs electrical discharge machining of a material to be processed by a wire electrode running between lower wire electrode guide devices, wherein the machining fluid supply nozzle is provided. Is fitted on the wire electrode guide main body, has a working fluid jetting tube at one end, and engages with a positioning groove formed on the peripheral surface of the wire electrode guide main body, thereby engaging the work material. It is formed by an outer cylinder structure movable between two positions: a near processing position and a wire electrode repair position which is separated from the positioning groove and moves away from the work material. Features a guide electrode device for electric discharge machines.

2. The wire guide device according to claim 1, wherein the wire guide body has a die guide through which the wire electrode is inserted at a central portion, and the wire guide body has a die guide. A wire electrode guide device of an electric discharge machine having a water passage hole for discharging a machining fluid in a machining fluid supply nozzle having an outer cylindrical structure.

3. The wire electrode guide device according to claim 1, wherein the machining fluid ejection pipe is screw-engaged with one end of the outer cylinder structure. Guide device.