Electric heating – Metal heating – Cutting or disintegrating
Patent
1987-12-24
1988-11-29
Pellinen, A. D.
Electric heating
Metal heating
Cutting or disintegrating
204297R, 219 69R, B23H 702
Patent
active
047884002
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates generally to a wire cut electric discharge machine and, more particularly, to a wire cut electric discharge machine equipped with a work table comprising a horizontal slide table formed of a conductive ceramic material and a work rest formed of a conductive ceramic material and fixed to the upper surface of the horizontal slide table, and capable of moving in a horizontal plane to move a work fixedly mounted thereon in a horizontal plane relative to a wire electrode running in a vertical direction.
BACKGROUND ART
As generally known, a wire cut electric discharge machine causes an electric discharge between a wire electrode and a workpiece when processing the workpiece for various kinds of machining processes, such as cutting, boring and shaping. Generally, the workpiece is held at ground potential and the wire electrode is held at a discharge potential, during electric discharge machining. Therefore, in most cases, the workpiece is connected electrically through the work table to a metallic bed.
Electric discharge machining entails a generation of heat in the machining section, and accordingly, a wire cut electric discharge machine for precision machining employs a heat nonconductive stone surface plate, such as a granite surface plate, as a horizontal slide table, and a work rest formed of a heat nonconductive material, to avoid deterioration of the machining accuracy due to a thermal deformation of the work table. The workpiece is connected electrically to the bed of the electric discharge machine by a grounding wire to hold the workpiece at ground potential.
Such a conventional electric discharge machine equipped with a work table formed of a heat nonconductive material, such as granite, having a comparatively small coefficient of linear expansion is able to avoid the deterioration of machining accuracy attributable to heat. However, grounding the workpiece by a grounding wire increases the reactance (L), entailing a reduction of machining speed and a deterioration of accuracy in detecting the progress of machining through a change of voltage.
DISCLOSURE OF THE INVENTION
Accordingly, it is an object of the present invention to solve the aforesaid problems in the conventional wire cut electric discharge machine.
It is another object of the present invention to provide a wire cut electric discharge machine equipped with a conductive work table which is effectively applied particularly to a wire cut electric discharge machine, for a very precise machining.
To achieve the objects of the invention, the present invention provides a wire cut electric discharge machine equipped with a work table comprising a horizontal slide table and a work rest fixed to the upper surface of the horizontal slide table, characterized in that the horizontal slide table and the work rest are formed of a conductive ceramic material.
That is, the present invention provides a wire cut electric discharge machine having a conductive work table mounted on the bed of the wire cut electric discharge machine and thus held directly at ground potential. Accordingly, a workpiece fixed to the work rest of the conductive work table is connected electrically through the horizontal slide table formed of a conductive ceramic material to the metallic bed of the wire cut electric discharge machine, so that the workpiece is held at ground potential.
BRIEF DESCRIPTION OF THE DRAWING
The above and other objects and advantages of the present invention will be described hereinafter in conjunction with the accompanying drawing, in which:
FIG. 1 is a schematic perspective view of a wire cut electric discharge machine equipped with a conductive work table in accordance with the present invention.
BEST MODE FOR CARRYING OUT THE INVENTION
Referring to FIG. 1, a wire cut electric discharge machine 10 has a column 12 and a bed 14. A supply drum for supplying a wire electrode 16, a take-up drum for taking up the electrode wire 16, and rollers such as guide rollers and pinch rollers are provided on the c
Aso Toshiyuki
Watanabe Sadahiro
Evans Geoffrey S.
Fanuc Ltd.
Pellinen A. D.
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