Electric heating – Metal heating – Cutting or disintegrating
Patent
1987-03-16
1988-03-22
Pellinen, A. D.
Electric heating
Metal heating
Cutting or disintegrating
204206, 219 69D, B23H 710
Patent
active
047330414
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
The present invention relates to a wire cut electric discharge machine employing a wire electrode and, more particularly, to a wire cut electric discharge machine incorporating improvements in the capability of accurate high-speed electric discharge machining.
2. Background Art
In the electric discharge machining of a metallic work mounted on a work table capable of being moved in the respective directions of an X-axis and a Y-axis perpendicularly intersecting each other in a horizontal plane by means of the wire electrode, the wire cut electric discharge machine employing a wire electrode is constructed so as to feed the wire electrode along a vertical axis (Z-axis) via a pair of wire guides disposed above and below the work table, respectively, and to spout a machining fluid from the wire guides against a portion of the work being machined. In most cases, the upper wire guide is mounted on a taper-machining table assembly movably attached to the lower end of the vertical column of the electric discharge machine so as to be movable in a U-axis and a V-axis perpendicularly intersecting each other and extending in parallel to the X-axis and the Y-axis, respectively. In such an arrangement, since the taper-machining table assembly is movable structure, the upper wire guide inevitably tends to be slightly dislocated by the reaction force of the spouting machining fluid. This tendency is particularly remarkable in high-speed electric discharge machining because the machining fluid is spouted at a high pressure for such high-speed electric discharge machining. The dislocation of the wire guide results in a minute dislocation of the wire electrode from the correct position to which the wire electrode is adjusted before starting electric discharge machining, so that the locus of the wire electrode deviates from the normal machining locus, causing errors in the electric discharge machining.
DISCLOSURE OF THE INVENTION
Accordingly, an object of the present invention is to provide a wire cut electric discharge machine provided with means for correcting the dislocation of the wire guide to eliminate such errors in machining.
In view of the foregoing object of the invention, the present invention provides a wire cut electric discharge machine comprising a taper-machining table assembly attached to the lower end of a vertical column vertically extending above a work table capable of being moved in the respective directions of an X-axis and a Y-axis perpendicularly intersecting each other in a horizontal plane, the taper-machining table assembly being movable in the respective directions of a U-axis and a V-axis perpendicularly intersecting each other in another horizontal plane parallel to the horizontal plane containing the X-axis and the Y-axis, a wire guide attached to the taper-machining table assembly and having a machining fluid spouting nozzle, and balancing means for applying a downward force, to counteract the reaction force of the spouted machining fluid, to the taper-machining table assembly by utilizing the fluid pressure prevailing in a branch line branched from a line for supplying the machining fluid to the machining fluid spouting nozzle. Thus, a downward force of a magnitude appropriate to an exact correction of the dislocation of the wire guide attributable to the reaction force of the spouted machining fluid is applied to the table assembly for taper-machining.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a front elevation of the essential portion of a wire cut electric discharge machine according to a first embodiment of the present invention;
FIG. 2 is a sectional view showing the construction of the balancing means of the first embodiment shown in FIG. 1 in detail;
FIG. 3 is a front elevation of the essential portion of a wire cut electric discharge machine, in according to a second embodiment of the present invention; and
FIG. 4 is a perspective view showing the upper wire guide and the adjacent section of a wire cut electric discharge machine according to a p
REFERENCES:
patent: 4495393 (1985-05-01), Janicke
patent: 4634825 (1987-01-01), Budin et al.
Evans Geoffrey S.
Fanuc Ltd.
Pellinen A. D.
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