JPS6268222A - Wire electrode guide unit - Google Patents

Abstract

PURPOSE:To perform hole drilling and surface machining by the same electrode guide unit, by enabling one of the plural U-type electrode guides to be relatively displaced for the other electrode guides. CONSTITUTION:A wire electrode guide unit 18, mounting its supporting plate 19 to the point end of a wire electrode guide shaft 16, rotates or turns by a predetermined angle. The guide unit 18, actuating cylinders 26 and 27 by supplying the pressure of oil, moves a wire electrode guide 25 provided in the point end of a cylinder rod 33, and when said guide 25 moves or in a fixed position after the movement, the guide unit 18, renewedly feeding a wire electrode 4 between a wire electrode guide 24 and the guide 25, performs machining of various complicated shape.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to electrical discharge machining using a wire electrode, and is directed to a wire electrical discharge machining device that can perform drilling, die-sinking, etc. in addition to so-called wire cut electrical discharge machining. This invention relates to improvements in electrode guide units.

[Conventional technology]

A pair of wire electrode guides that form a wire cut electrical discharge machining section and an electrode path forming roller are provided on a support arm that is rotatably supported in a straight line that intersects the processing table surface, so that the wire electrode can be fed and collected. In addition, the support arm is configured to be able to rotate under control, and an apparatus for wire-cut electrical discharge machining of the outer periphery of a workpiece (for example, Japanese Patent Publication No. 57-1999)
No. 57,207, etc.) are being widely used, but there are problems in that the applications are narrow and the operating rate of the device is low.

On the other hand, the wire electrode is supplied, guided and recovered along a guide path defined by the wire electrode guide supported rotatably and freely up and down, and the wire electrode guide is rotated together with the guided wire electrode. ＼Place the wire electrode opposite the workpiece across a small machining gap, supply machining fluid into the machining gap, and apply machining voltage pulses and relative machining feed between the wire electrode and the workpiece. Electrical discharge machining equipment that performs electrical discharge machining on workpieces is well known and widely used.
be.

Further, the wire electrode guide includes a plurality of electrode guides forming a substantially U-shaped wire electrode guide path, and electrical discharge machining is performed on the workpiece by the wire electrode that is renewed and fed along the wire electrode guide path. Wire electrode guide units used for this purpose are also known (for example, Japanese Patent Laid-Open No. 55-54.1).
38, No. 59-196.126, etc.), and is becoming widely used.

According to the second and third electric discharge machining apparatuses, there is no need to use an expensive full-form electrode, and machining can be performed without substantially wearing out the electrode during machining, which is extremely economical.

However, since the wire electrode guide unit in the electrical discharge machining apparatus described above has a fixed wire electrode guide path, it has a length that allows machining of the same shape, and there is a problem that it cannot handle complex die-carving shapes. there were. Also, this second and third
According to the electric discharge machining apparatus, although a wire electrode is used as a machining electric bridge, so-called wire cut electric discharge machining or the above-mentioned first wire cut electric discharge machining mode cannot be performed.
It had limited uses.

[Problems to be solved by the present invention]

The present invention has been made to solve the above-mentioned problems, and its purpose is to provide an electric discharge machining apparatus capable of performing various types of machining using wire electrodes as machining electrodes. An object of the present invention is to provide a wire electrode guide unit.

[Means for solving problems]

Therefore, the above object is to provide a plurality of electrode guides forming a substantially U-shaped wire electrode guide path, and perform electric discharge machining on a workpiece by a wire electrode that is renewed and fed along the wire electrode guide path. In the wire electrode guide unit used for performing the above-mentioned plurality of electrode guides, at least one of the plurality of electrode guides is supported so as to be movable relative to the other electrode guide adjacent to it, and one or both of them are supported. This is achieved by configuring the electrical discharge machining to be performed using a wire electrode that is fed in a renewed manner.

[For production]

With the above configuration, at least one electrode guide can be arbitrarily displaced relative to another electrode guide adjacent to it, so that it can be used not only for wire-cut electrical discharge machining using wire electrodes, but also for electrode guides. Even complex machining such as hole drilling or surface machining using a wire electrode along the wire can be performed using a single wire electrode guide unit without requiring replacement of the electrode guide.

〔Example〕

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

FIG. 1 is an explanatory view showing an embodiment of an electrical discharge machining apparatus using a wire electrode guide unit according to the present invention, and FIG. 2 is an enlarged view of the wire electrode guide unit according to the present invention.

In FIGS. 1 and 2, 1 is a column of the electric discharge machining apparatus, 2 is an arm or machining head that extends from the column 1 and is attached to be able to move up and down, and 3 is a lifting motor for the arm or machining head 2. , 4 is a wire electrode; 5 is a rotary casing that accommodates a wire electrode supply and recovery device consisting of components 6 to 13 described below and is rotatably attached to the arm or processing head 2; 6 is a wire electrode supply Reel, 7 is a brake roller, 8 is a current-carrying roller, 9 and 10 are guide rollers, 11 is a capstan, 12 is a pinch roller, 13 is a wire electrode collection reel, 14, I4 is a bearing, ] 5 is a rotating motor, 16 17 is a wire electrode guide shaft attached to extend downward from the bottom surface of the rotary housing 5 so that its central axis coincides with the central axis of rotation of the rotary housing 5; and 17 is the rotation axis of the rotary motor 15. A coupling I8 connected to the wire electrode guide shaft 16 is attached to the tip of the wire electrode guide shaft 16, and a wire electrode guide unit 19 is comprised of components 19 to 38 shown in FIG. 2 and described below. Support plate, 20.21.22
．． 23 is a guide roller, 24.25 is a wire electrode guide or folding roller, 26.27 is a cylinder, 28.29 is a mounting shaft, 30 is a connecting shaft, 31.32 is the above-mentioned mounting shaft 28.2
9 is rotatably attached to the cylinder 26, 27.
33, 34 is a rod of the cylinder 26, 27, 35 is attached to the side surface of the cylinder 26, and is rotatably attached by the cylinder rod 34 and the connecting shaft 30. A coupling device for rotatably moving the cylinders 26 and 27;
36 is attached to the side surface of the tip of the cylinder 26,
A fitting for attaching the guide roller 21, 37
．． 38 is an encoder attached to the tip of the cylinder 26.27 to detect movement of the cylinder rod 33.34; 39 is provided inside the rotating housing;
27 is a hydraulic unit for supplying hydraulic pressure, 40 is a machining liquid jet nozzle, 41 is a bed, 42 is a cross slide table, and 43 is a workpiece.

Note that the wire electrode 4 and the workpiece 42 are connected via the power supply roller 8.
A power supply device that applies a voltage pulse for electrical discharge machining between the wire electrode and the workpiece, a drive mechanism that raises and lowers the arm or the machining head 2, and a machining feed along the X-Y axis between the wire electrode and the workpiece. The drive mechanism of the cross-slide table for providing this, the numerical control device that controls this, the piping between the hydraulic unit and the cylinders 26, 27, etc. are omitted in the figure.

The wire electrode 4 pulled out from the wire electrode supply reel 6 passes through the guide roller 9 between the guide roller 7 and the current-carrying roller 8, and then reaches the wire electrode guide or folding roller 24, 25 at the tip of the wire electrode guide unit 18. After that, it passes through guide rollers 21, 22, 23 and 10, is pinched by a capstan 11 and a pinch roller 12, and is slowly taken up and wound onto an electrode collection reel 13. During processing, one or both of the wire electrode guide at the tip of the wire electrode guide unit 18 or only the portion of the wire electrode 4 between the folding rollers 24, 25 or the rollers 24.
25 is opposed to the workpiece 43 with a small gap maintained, and a voltage pulse for electric discharge machining is applied between the wire electrode 4 and the workpiece 43 from a power supply device (not shown), and at the same time. Machining fluid is jetted and supplied from the machining fluid jetting nozzle 40 toward the machining portion, thereby performing electric discharge machining on the workpiece 43.

For example, the wire electrode guide unit I8 rotates slowly around its axis during processing at the position of the wire electrode guide or folding roller 25 shown by the solid line in FIG. 2, or alternately reciprocates in positive and negative directions. By rotating the arm or processing head 2 slowly and simultaneously, the wire electrode 4 is renewedly fed to the workpiece 43 between the wire electrode folding rollers 24 and 25. Drilling is performed with a diameter regulated by .

That is, the support plate 19 of the wire electrode guide unit 18 is attached to the tip of the wire electrode guide shaft I6, and the upper part of the wire electrode guide shaft 16 is rotatable by a bearing 14.14 in the arm or processing head 2. The upper end of the wire electrode guide shaft 16 is connected to the rotary motor 1 by a coupling I7.
It is connected to the output shaft of 5. Therefore, the rotation motor 15
When driven, the wire electrode guide shaft 16 and the rotating housing 5 are rotated via the coupling 17, and the wire electrode guiding unit 18 can also be rotated or rotated within a predetermined angular range together with the rotating housing 5. It looks like this.

Thus, the wire electrode guide unit 18 is connected to the hydraulic unit 3.
9 actuate the cylinders 26 and 27, and the wire electrode guide or return roller 25 provided at the tip of the cylinder rod 33 is moved to the position shown by the two-dot chain line in FIG. During movement or at that position, various complicated shapes are processed by the wire electrode 4 which is renewed and fed between the wire electrode guide or folding rollers 24 and 25 as described above.

On the other hand, in the wire electrode guide unit [8], the wire electrode 4 follows the movement of the wire electrode guide or folding roller 25.
In order to stably supply and collect the wire electrode 4, the wire electrode supply and recovery device consisting of the wire electrode supply reel 6 to the recovery reel 13 is made to follow the displacement of the wire electrode guide or folding roller 25 to renew and feed the wire electrode 4. need to be controlled.

For this purpose, in the embodiment shown in the drawings, the wire electrode 4
In addition to the predetermined machining feed, the renewal feed moves the wire electrode guide or folding roller 25 until the cylinder opening >4'3.
The displacement of 3.34 is detected by encoder 37.38,
It controls the wire electrode supply reel 6 to the collection reel 13.

〔Effect of the invention〕

Since the present invention is constructed as described above, according to the present invention, the wire electrode guide or folding roller 25 can be arbitrarily displaced relative to the wire electrode guide or folding roller 24, and the distance between the two or the direction can be changed. Since electrical discharge machining is performed by the wire electrode that is renewed and fed, in addition to the so-called wire cant electrical discharge machining, drilling and surface machining can be performed using the wire electrode along the guide body, and the machining methods such as surface machining can also be performed. , a wire electrode unit of a high-precision, high-performance electric discharge machining machine that can adjust the head angle and length of the wire electrode at any time to suit the machining shape, even in complex die-sinking machining, and perform the desired machining. This is something that can be provided.

Note that the configuration of the present invention is not limited to the above-mentioned embodiments, and for example, 1. As a moving mechanism for the wire electrode guide or folding roller 25, a combination of two cylinders 26 and 27 was used, but a motor may be attached to drive the rotating shaft of the -1L cylinder 26. cylinder 26
Alternatively, the wire electrode guide unit 7) may be driven by a motor and a feed screw mechanism, and various known means and configurations may be adopted for the method of rotating the wire electrode guide unit 7) around the central axis. , and the configurations of other elements can also be freely changed in design within the scope of the objective of the present invention, and the present invention encompasses all of them.

[Brief explanation of drawings]

FIG. 1 is an explanatory view showing an embodiment of an electrical discharge machining apparatus using a wire electrode guide unit according to the present invention, and FIG. 2 is an enlarged view of the wire electrode guide unit according to the present invention. 1--1. −−−・−−−−−−−−−−
- Lifting motor 4 - - - - - - - - Wire electrode 5 - - - One rotation casing 6 - - - - - - - - --- Wire electric supply reel 7 --- Brake roller 8 ---
-・-One energizing roller 9.10------ Guide roller] 1------
---Capstan 12 ------Pinch roller 13--
--------------Wire electrode collection reel 14
．． 14-- -Hehehehe ring 15----
− ・−・−−m− Rotation motor +6 −−−−−−−−
---Wire electrode guide shaft +7---1--1---Kampling 18-------1~---Wire electrode guide unit! 9 - - - - Support plate 20.21.22.23 - - Guide roller 24.2
5------- Wire electrode guide or folding roller

Claims (1)

[Scope of Claims] A method for performing electric discharge machining on a workpiece by a wire electrode that is provided with a plurality of electrode guides that form a substantially U-shaped wire electrode guide path, and that is updated and fed along the wire electrode guide path. In the wire electrode guide unit used, at least one of the plurality of electrode guides is supported so as to be movable relative to the other electrode guide adjacent to it, and one or more of the electrode guides is supported so as to be movable relative to the other electrode guide. The wire electrode guide unit described above is configured to perform electrical discharge machining using the fed wire electrode.