Electric heating – Metal heating – Cutting or disintegrating
Patent
1988-08-05
1989-12-05
Pellinen, A. D.
Electric heating
Metal heating
Cutting or disintegrating
219 6912, 318632, B23H 100, B23H 706, B23H 732
Patent
active
048854492
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Art
This invention relates to an electric discharge machine, and more particularly to an improvement of the accuracy of feed thereof.
2. Background Art
FIG. 1 is a front view showing a general wire cut electric discharge machine. In FIG. 1, reference numeral 1 designates a wire electrode; 2, a wire electrode supplying bobbin; 3, wire electrode withdrawing rollers; 4, a wire electrode withdrawing box for withdrawing a wire electrode used; 5, a brake roller; 6, workpiece; 7, a machining solution; 8, machining-solution supplying nozzles; 9, a machining tank containing the machining solution 7; 10, a central control unit; 11, an X-table moving along the X-axis in a horizontal plane; 12, a Y-table moving along the Y-axis perpendicular to the X-axis; 13, a surface table on which a workpiece is mounted, the surface table 13 being fixedly secured to the Y-table 12; 14, an electric motor for driving the X-table 11; 15, an encoder for detecting an amount of drive of the X-table driving motor 14; 16, X-table moving guides in the form of rails which are provided on a bed 20 (described later); 17, an electric motor for driving the Y-table 12; 18, an encoder for detecting an amount of drive of the Y-table driving motor 17; 19, Y-table moving guides; 20, the bed on which the X-table 11 and the Y-table 12 are mounted; 21, a vertical Z-shaft; 22, a driving electric motor for moving the Z-shaft 21 vertically; 23, an encoder for detecting an amount of drive of the Z-shaft driving motor 22; 24, a guide for moving the Z-shaft 21; and 25, a taper machining device.
FIG. 2 is perspective view showing an X-table moving mechanism. In FIG. 2, reference numeral 27 designates a speed reducer for reducing the speed of rotation of the X-table driving motor 14; 28, a ball screw driven through the speed reducer by the motor 14; 29, a nut engaged with the ball screw; 30, sliders moving along the guides 16; and 32 and 33, wire guides provided in the nozzles 8, respectively. FIG. 3 shows a device for correcting the amounts of drive of the drive shafts.
The operation of the wire cut electric discharge machine thus constructed will be described. In FIG. 1, the wire electrode 1 is supplied from the wire electrode supplying bobbin 2, and withdrawn by the wire electrode withdrawing rollers 3, so that the wire electrode 1 used is put in the wire electrode withdrawing box 4. In this operation, the wire electrode 1 is held under predetermined tension by means of the brake roller 5. Electric energy is applied between the wire electrode 1 and the workpiece 6 by an electric power source (not shown), so that an electric discharge takes place between the wire electrode 1 and the workpiece 6 to machine the latter 6. The machining solution 7 is supplied to the gap between the wire electrode 1 and the workpiece 6, namely, an inter-electrode gap through the machining solution supplying nozzles 8, for the purpose of insulation and cooling. Sometimes, the machining solution 7 is put in the machining tank 9, so that the workpiece is machined while being kept immersed in the machining solution 7.
A desired machining configuration has been programmed in the main memory of the central control unit 10. In response to instructions from the central control unit 10, the drive shafts are driven so that the X-table 11 and the Y-table 12 are moved, as a result of which the workpiece 6 mounted on the surface table 13 is moved relative to the wire electrode 1 so that the workpiece is machined as if cut with a fret sawing machine. The X-table 11 and the Y-table 12 are moved along the table moving guides 16 and 19 by the driving motors 14 and 17, respectively. The guides 16 for the X-table 11 are secured to the bed 20, and the guides 19 for the Y-table 12 are secured to the X-table 11. The position data of the X-table 11 and the Y-table 12 are applied to the central control unit 10 by the encoders 15 and 18. When it is required to taper the workpiece, the taper machining device is driven to move the upper wire electrode guide 32 along the U-axis in
REFERENCES:
patent: 3708736 (1973-01-01), Hoshina et al.
patent: 4392195 (1983-07-01), Inoue
patent: 4559434 (1985-12-01), Kinoshita
patent: 4622449 (1986-11-01), Inoue
patent: 4703143 (1987-10-01), Okubo et al.
Magara Takuji
Suzuki Toshio
Evans Geoffrey S.
Mitsubishi Denki & Kabushiki Kaisha
Pellinen A. D.
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