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Abstract

Method of reducing the wear of the electrode in machine tools using electro-erosion. There is provided a circuit with different stages of power; the tension of the first can be superior, facilitating the ionization of the channel and reducing the delay of ionization. A circuit detects the ionization and sets going some programmable counters which count impulses proceeding from the time base, the frequency of which is superior to that of the work impulses; when the preselected count has been reached, the circuit emits a signal of conduction to the following power stage, which supplies an impulse of stronger current, with a certain delay with respect to the first, and so on. By succeeding in establishing the working current in a spaced-out form, it can materialize in one or more jumps so that the currents selected continue to increase progressively, varying at will the shape of the rising side of the current impulse. This method reduces the wear of the electrode by at least about 50%.

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First Claim