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Abstract

A traveling-wire electroerosion method and apparatus in which the cutting feed rate is cyclically increased and decreased in a prescribed manner. In a first step of the method, the cutting feed is effected along one portion of a commanded feed path at a maximum rate by a certain first extent such that the traveling wire span between the guide members bends backwards, thus deviating beyond a certain degree from the straight-line path established between the guide members. In a second step, the cutting feed is effected along another portion of the feed path immediately following that one portion at a minimum rate and by a certain small extent such that the bent traveling wire span comes into alignment with the straight-line wire travel path. A control unit is provided which operates a numerical controller to repeat the two-step cycle and may be operable also to act on a flushing medium supply unit, a wire-tension unit and a power supply unit to minimize the rate-reduced time period or distance of feed while maintaining the width of the cut slot or kerf materially unvaried throughout the process.

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First Claim