PROCESS FOR IDENTIFYING EXISTENCE OF PARTIALLY WELDED SPOTS AND RETENTION OF CUT-OUT PART IN WIRE-CUT ELECTRICAL DISCHARGE MACHINING
First Claim
1. A process for identifying existence of a welded spot on a cut-out part and retention of the cut-out part on a workpiece in a wire electrode discharge process comprising of the steps of, cutting a part to be separated from the workpiece with electrical discharge using spark energy generated by application of an inter-electrode voltage which occurs across a wire electrode and the workpiece lying in opposition to the wire electrode, changing an electrical processing condition applied across the wire electrode and the workpiece from a cutting phase to a welding phase at least one spot in a preselected cutting path or kerf of the part, fusing at least partially the wire electrode and welding the part with the workpiece at the spot in a preselected contour of the part, andfurther comprising of a rough cutting step in which the workpiece is rough cut to form the part in the cutting phase of the electrical processing condition with leaving the spot to be welded later, a welding step in which the electrical processing condition is switched over from the cutting phase to the welding phase to form a welded spot at the spot to be welded later thereby welding together the part with the workpiece, inspection step in which the electrical processing condition is changed to a positioning phase or a positioning power source in which the wire electrode is moved forward or backward to detect whether the wire electrode comes into contact with the welded spot without making contact with any of the part and the workpiece, and a step going ahead to one of next procedures to be executed on any of the part and workpiece in response to a state where the wire electrode comes into contact with the welded spot while the part is in safe retention on the workpiece or another next procedure to generate an alarm in response to another state where the wire electrode has no contact with the welded spot while the part is in no safe retention on the workpiece and the wire discharge is ceased.
1 Assignment
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Accused Products
Abstract
A process for identifying existence of a welded spot on a cut-out part and retention of the cut-out part on a workpiece in a wire electrode is disclosed which makes it possible to go ahead process steps while identifying automatically the retention of the cut-out part on a workpiece, ensuring unmanned work of the wire electrode discharge processor with saving the personnel and labor. The process comprises a rough cutting step to cut out the part from the workpiece, a welding step to partially weld the part with the workpiece, and an inspection step to detect whether the wire electrode comes into contact with a welded spot while moving the wire electrode along the cutting path of kerf in the workpiece. After the wire electrode has come into contact with the welded spot whereby the retention of the part on the workpiece has been identified, a step goes ahead to one of next procedures. On the other, after the wire electrode has come into no contact with the welded spot whereby no retention of the part on the workpiece has been identified, a step goes ahead to generate an alarm and the wire electrical discharge is ceased.
32 Citations
9 Claims
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1. A process for identifying existence of a welded spot on a cut-out part and retention of the cut-out part on a workpiece in a wire electrode discharge process comprising of the steps of, cutting a part to be separated from the workpiece with electrical discharge using spark energy generated by application of an inter-electrode voltage which occurs across a wire electrode and the workpiece lying in opposition to the wire electrode, changing an electrical processing condition applied across the wire electrode and the workpiece from a cutting phase to a welding phase at least one spot in a preselected cutting path or kerf of the part, fusing at least partially the wire electrode and welding the part with the workpiece at the spot in a preselected contour of the part, and
further comprising of a rough cutting step in which the workpiece is rough cut to form the part in the cutting phase of the electrical processing condition with leaving the spot to be welded later, a welding step in which the electrical processing condition is switched over from the cutting phase to the welding phase to form a welded spot at the spot to be welded later thereby welding together the part with the workpiece, inspection step in which the electrical processing condition is changed to a positioning phase or a positioning power source in which the wire electrode is moved forward or backward to detect whether the wire electrode comes into contact with the welded spot without making contact with any of the part and the workpiece, and a step going ahead to one of next procedures to be executed on any of the part and workpiece in response to a state where the wire electrode comes into contact with the welded spot while the part is in safe retention on the workpiece or another next procedure to generate an alarm in response to another state where the wire electrode has no contact with the welded spot while the part is in no safe retention on the workpiece and the wire discharge is ceased.
Specification