Wire electrode clamping mechanism of wire-cut electric discharge

Details Wire electrode clamping mechanism of wire-cut electric discharge Wire electrode clamping mechanism of wire-cut electric discharge

1985-04-29

1986-08-26

Albritton, Clarence L.

Electric heating

Metal heating

Cutting or disintegrating

204206, 219 69R, B23H 710

Patent

active

046084789

DESCRIPTION:

BRIEF SUMMARY
DESCRIPTION

1. Technical Field
This invention relates to improvements in a wire electrode clamping mechanism mounted on a wire electrode pull-up mechanism for pulling up a severed wire electrode in a wire-cut electric discharge machine.
2. Background Art
A wire-cut electric discharge machine operates by impressing a pulsed voltage across a wire electrode and a workpiece to produce an electrical discharge across the intervening space for the purpose of eroding the workpiece, and moving the workpiece relative to the wire electrode on the basis of machining command data to cut the workpiece into any desired contour. Ordinarily, the workpiece is provided with a hole through which the wire electrode is passed at the start of cutting. In a case where a plurality of these cutting starting holes are provided, the wire-cut electric discharge machine has an attached automatic wire electrode connecting device for severing the wire electrode at the end of a job which has started at one of the cutting starting holes, passing the wire electrode through the next cutting starting hole, tensioning the wire electrode and carrying out automatic operation. Further, there are occasions where the wire electrode breaks within the workpiece if such machining cutting conditions as the impressed voltage, wire electrode feed speed and tension are improper during the electric discharge operation. In the event of such, breakage of the wire electrode, it is required that this fact be sensed by a wire breakage sensor provided on the electric discharge machine and that the wire electrode be restored automatically without delay by an automatic wire electrode recovery device attached to the wire-cut electric discharge machine.
FIG. 1 is a view showing the construction of a wire-cut electric discharge machine having the conventional automatic wire connecting and automatic recovery devices. In the Figure, numeral 1 denotes a column and 2 a wire electrode wound around a delivery reel 3 arranged on the column 1. The wire electrode 2 paid out by the delivery reel 3 is passed through a hole 21 in a workpiece 12 via a friction brake 4, a roller 5 driven by a drive motor 18, a guide roller 6, a lower guide 7, a wire electrode feed mechanism 9 and a lower nozzle 11. The wire electrode 2 is delivered to a wire electrode processing device 17 via a gripper 110 of a wire electrode clamping mechanism 30 provided on the distal end of a wire electrode pull-up mechanism 13, an upper guide 14, a conduction pin 15 and feed rollers 16. A table mechanism 19 on which the workpiece 12 is set is adapted to be moved in X and Y directions by two workpiece feed motors MX, MY, respectively. Numeral 20 denotes a drive motor for the wire electrode pull-up mechanism 13. By winding up or paying out a rope 22, one end of which is fastened to the pull-up mechanism 13, the motor moves the wire electrode pull-up mechanism 13 up and down. L.sub.1 denotes a limit switch for sensing breakage of the wire electrode 2, and L.sub.2, L.sub.3 represent limit switches for sensing when lowering and elevation of the wire electrode pull-up mechanism 13 have been completed, respectively. Numeral 8 in the Figure denotes a cutter arranged between the wire electrode feed mechanism 9 and the lower nozzle 11, and numeral 10 designates a wire position sensor arranged between the cutter 8 and the nozzle 11.
In a wire-cut electric discharge machine having the above construction, the wire electrode 2 is guided so as to be oriented substantially vertically between the lower guide 7 and the upper guide 14 and is pulled upwardly by the feed roller 16 longitudinally so as to travel by the portion where the workpiece 12 is cut. A prescribed voltage is impressed across the wire electrode 2 and the workpiece 12, and the table mechanism 19 is driven by the workpiece feed motors MX, MY to transport the workpiece 12 in a horizontal plane, whereby electric discharge machining is performed along a desired contour.
When the wire electrode 2 breaks in passing through the workpiece 12, the limit switch L.sub.l

REFERENCES:
patent: 3891819 (1975-06-01), Ullmann et al.
patent: 4242559 (1980-12-01), Roemer et al.
patent: 4506129 (1985-03-01), Katsube et al.
patent: 4523074 (1985-06-01), Okuda

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