JPS5964232A - Wire-cut electric-discharge machine - Google Patents

Abstract

PURPOSE:To make it effective for accurate electro-discharge machining performance, by installing a mechanism capable of measuring the tension of an electrode wire directly and accurately, in case of an electrode wire feed system for electro-discharge machining use. CONSTITUTION:One roller 51 included in an electrode wire feed system is supported by a lever 53 via an elastic body or a spring 52. Likewise, gear-pinions 55 and 56 from a tension displacement spread mechanism spreading the angle displacement of the lever 53. For your information, this wire feed system comprises a pointer 57 and a scale 58 interlocking the pinion 56. With this constitution, wire tension can be directly detected, and when anything unusual happens in the machining electrode wire feed system, inclusive of a secular change, trouble or the like in a pulverulent body type brake, any change in the wire tension can be detected at one so that it is very effective for accurate machining performance.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Technical Field of the Invention The present invention relates to a wire-cut electrical discharge machine. In particular, the present invention relates to a wire-cut electric discharge machine having a tension measuring means for a machining electrode wire.

(2) Background of the technology A wire-cut electric discharge machine is a machining fluid that is injected into the gap between a workpiece and a machining electrode wire that extends in a straight line through the workpiece. generating an intermittent electrical discharge in the machine, and causing the intermittent electrical discharge to extremely locally soften or melt the machined region of the workpiece, and to generate intermittent changes in pressure locally in the vicinity of the machined region; This is a metal processing machine that peels off and removes the locally softened and melted workpiece area of the workpiece through intermittent changes in pressure, and uses a numerically controlled servo system etc. to process the electrode wire. accurately guides along the machining surface.
n degree is extremely good; (ii) machining can be performed along any irregularly shaped path; ■ t14 forming the workpiece;
It has features such as scales that can be processed regardless of the hardness of No. 11.

By the way, the above-mentioned processing accuracy depends on the geometric accuracy of the point where the processing electrode wire contacts the workpiece. Of course, it is important that the tension of the electrode wire is properly controlled at all times, and if an abnormality occurs in the tension, it must be corrected immediately. This is because fluctuations in tension impair the straightness of the machining tt=i wire and impair the geometric accuracy of the machining point.

(3) Prior art and problems FIG. 1 shows an example of the conceptual configuration of a conventional electrical discharge machining electrode wire supply system. In the figure, reference numeral 1 denotes an electrode wire, and tension is applied to it by a brake roller 21 and a feed roller (capstan roller) 41 for feeding the wire. The brake roller 21 uses a powder type brake that can control brake torque, and the zero feed roller (capstan roller) 41 performs constant current control to keep the brake torque constant to keep the tension constant. The electrode wire 1 is sent by being driven by a motor 43.

42 is a pinch roller used together with the feed roller (capstan roller) 41.

However, in powder type brakes that are normally used to brake the brake roller 21, it is easy to keep the torque constant due to changes in the powder over time, even though constant current control is performed. isn't it. Therefore,
It is necessary to periodically monitor the wire tension in some areas of the electrode wire (processing area) using a portable tension meter, which is cumbersome and not always accurate as it is an indirect measurement method. There is a drawback.

(4) Purpose of the Invention The purpose of the present invention is to eliminate this drawback.
lj, in the electrode wire starting system for processing 7, the tension of the electrode wire can be measured directly and positively (4 can be measured on the plane 'A 4
An object of the present invention is to provide a wire-cut electric discharge machine having the following features.

(5) Structure of the Invention The structure of the present invention is that in an electrode wire supply system for electric discharge machining, (a) one of the guide rollers having the function of guiding the electrode wire elastically supports this roller; l
11j, for example, a lever is provided, (b) this mechanism for elastically supporting the roller is displaced according to the tension of the N pole wire, and (c) a mechanism for expanding the displacement of this elastic support mechanism is provided. and (d) provide an electrode wire tension measuring means that manually measures this expansion (various displacements).

In the above configuration, the electrode wire tension measuring means may be an electrode wire JJ force meter that enables direct visual observation of the tension of the battery wire, or may be a sensor of an automatic tension control device. is also possible.

The inventor of the present invention has constructed an electric wire feeding system for wire processing, and accurately and directly visually inspects the opening located between the feed roller and the unwinding roller that apply tension to the MqM wire. I got the idea that it would be possible to detect changes in tension, and in order to put this idea into practice, I installed a lever, etc. that supported this roller with an elastic bend, and with the fulcrum of this lever as the center, the wire tension As a result of the change, the roller supported by this lever will be displaced, and the displacement of this lever will be changed by another displacement."-6;g 4
The present invention was completed by installing a 4m t4 that detects and magnifies this through a scale, etc., and directly measures the displacement of tension using a scale or the like.

(6) Embodiment of the Invention Referring to Figure M1, an embodiment of the present invention will be described below. tl
The ffi wire supply system will be explained to clarify the structure and special effects of the present invention.

FIG. 2 shows a conceptual configuration of an embodiment of the present invention (this H type 1) (one-work electrode wire feeding system), and shows the electrode wire fJ in the prior art shown in FIG. (One roller 51 included in the yarn feeding is supported by four elastic rollers, i.e., springs 52/4-53.

The lever 53 is rotatable around a fulcrum 54. 55
．． 56 is a tension displacement P sky that expands the angular displacement of the lever 53 (it is a V gear and pinion on the side of the boundary. 571 is a vinyl A-
58 is a scale.

By providing this tQ ti4, it is possible to directly detect the wire tension (J), and it is possible to directly detect the wire tension (J) of the powder type brake. In the event of an abnormality, changes in the wire bow can be immediately detected, which is effective for performing proper hII work.

In addition, since the tension scale 1 has good linearity with respect to changes in wire tension, the wire tension can be easily and inexpensively calibrated once after replacing the brake key. Therefore, by providing this Va<F+ in the electric shaft and wire supply system for Tc tunnel machining, a wire cut electric discharge machining ETO♂ structure with good machining accuracy can be realized.

In the above embodiment, the lever 53 that elastically supports one of the guide rollers 51 via the spring 52 constitutes a mechanism for elastically supporting the roller. This is an example and does not limit the invention.

(Effects of Chikara Kabutocho As explained above, according to the present invention, a one-day system for directly and accurately measuring the tension of the depleted wire in the free processing electrode wire supply system is provided. Wire-cut electric discharge machining 4z (can be provided).

[Brief explanation of drawings]

Figure 1 shows an example of the configuration of a wire supply system for electric discharge machining in the prior art (this is a U-IA, and Figure 2 is a diagram of the main B
1 is a conceptual diagram showing an example of the configuration of an electrode wire supply system for commercial machining provided with a wire force detection mechanism, which is the gist of wire cut electric discharge machining according to one embodiment of the present invention. 1... ... Electrode wire, 21 ... Brake roller, 22 ... Powder type brake, 41 ...
...Feed roller (capstan roller),
42... Pinch roller, 43... Feed roller drive motor, 51... Roller for tension detection, 52... Elasticity for tension detection roller support lever. Body, 53...Roller support lever for tension detection, 54...Fully point of roller support lever for tension detection, 55.56...Roller support lever for tension detection for expanding displacement Gear and pinion, 57.58...
Tension indicator and scale. Patent applicant: Fanuc Co., Ltd. Agent Patent attorney: Makoto Samukawa −

Claims (1)

[Claims] It has a mechanism that elastically supports one of the rollers constituting the electrode wire supply system for electric discharge machining, and the elastic support mechanism is displaced according to the tension of the electrode wire, and the displacement of the elastic support mechanism is expanded. 1. A wire-cut electric discharge machine, comprising: a mechanism for expanding the enlargement mechanism;