Electric heating – Metal heating – Cutting or disintegrating
Patent
1989-12-29
1991-12-17
Evans, Geoffrey S.
Electric heating
Metal heating
Cutting or disintegrating
219 6914, 226 90, 226 97, B23H 710
Patent
active
050736914
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to a wire cut electric discharge machine, and more particularly to an improvement of a device for automatically feeding a thin wire electrode.
BACKGROUND OF THE INVENTION
In a wire cut electric discharge machine, a wire electrode is confronted with a workpiece with a small gap therebetween, and a pulse discharge is repeatedly caused between the workpiece and the wire electrode which is continuously fed, so that the workpiece is machined by the discharge energy. The wire electrode is generally thin, about 0.03 to 0.1 mm in diameter. FIG. 3 is a diagram showing the arrangement of an automatic wire electrode feeding device in a wire cut electric discharge machine which has been disclosed, for instance, by Japanese Patent Application (OPI) No. 80518/1985 (the term "OPI" as used herein means an "unexamined published application"). In FIG. 3, reference numeral 10 designates a workpiece to be machined which is mounted on an X-Y cross table (not shown) which is movable in a horizontal plane; 12a and 12b, machining start holes which are formed on a surface of the workpiece 10 in advance; 14, a guide supporting the wire electrode feeding device, the guide 14 being fixedly mounted on a shaft which is movable in the Z-axis direction of the wire cut electric discharge machine body (not shown); i.e., in a vertical direction; and 16, a slider forming a part of a moving mechanism 17, the slider 16 being slidable vertically along the guide 14. The slider 16 is engaged with a drive screw 18, the upper end portion of which is coupled to a drive motor 20 fixedly mounted on the upper portion of the guide 14, so that the slider 16 is automatically slid on the guide 14 by means of the drive screw 16 and the drive motor 20. A roller mechanism 22 is mounted on the slider 16. The roller mechanism 22 comprises a pair of pulleys, namely, a wire electrode feeding pulley 24 and a clamp pulley 26. The rotary shaft of the wire electrode feeding pulley 24 is coupled to a wire electrode feeding motor 28 which is fixed to the slider 16. The pulley 24 has a reverse rotation preventing mechanism 29. The clamp pulley 26 is rotatably supported on the end portion of a link 32 which is rotatably mounted on a pin 30 embedded in the slider 16. The rear end portion of the link 32 is coupled to the slider 16 through a coil spring 34, so that the clamp pulley 26 at the end of the link 32 is kept pushed against the wire electrode feeding pulley 24 by the elastic force of the coil spring 34.
Further in FIG. 3, reference numeral 36 designates a pipe guide (for instance 2 to 3 mm in outside diameter) into which a wire electrode 38 is inserted so as to be supported thereby. The upper end portion of the pipe guide 36 is secured through a mounting member 40 to the slider 16 forming the moving mechanism 17. A power source guide for slidably supporting the wire electrode 38 is fitted in the lower end portion of the pipe guide 36. A predetermined voltage is applied across the pipe guide 36 and the workpiece 10. When the pipe guide 36 is brought into contact with the workpiece 10, a detector 91 outputs a detection signal. In response to the signal, the drive motor 20 is stopped, and the wire electrode feeding motor 28 is driven, so that the wire electrode 38 is fed through the pipe guide 36. A clamp mechanism 42 is provided at the lower end portion of the guide 14, to fixedly support the pipe guide 36 at a predetermined position. The clamp mechanism 42 comprises: a clamp board 44a fixedly mounted on the lower end portion of the guide 14, the clamp board 44a having a V-groove; and a clamp board 44b coupled to a solenoid 46 which is fixedly mounted on the guide 14. Upon energization of the solenoid 46, the clamp board 44b is moved away from the clamp board 44a; that is, the clamp state is eliminated; that is, the pipe guide is released. When the solenoid is deenergized, the clamp board 44b is moved towards the clamp board 44a by the elastic force of a coil spring 48 which is interposed between the solenoid 46 and t
REFERENCES:
patent: 4578555 (1986-03-01), Inoue
patent: 4755651 (1988-07-01), Tsutsui et al.
Iwasaki Takeshi
Magara Takuji
Suzuki Toshio
Yamamoto Masahiro
Evans Geoffrey S.
Mitsubishi Denki K.K.
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