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Abstract

Device and process to control at least one machining parameter of an electrode-wire EDM machine according to a protection strategy, in particular to avoid short-circuits, or to improve machining conditions so as to obviate the risk of electrode-wire breakage. That strategy consists of the following stages: continuous monitoring of the variation of a factor, a change in which beyond a predetermined critical threshold is an indication of risk of breakage and/or a drop in machining quality; gradual and stepped variation of one or more parameters as soon as a monitored factor exceeds its critical threshold and as long as it remains beyond this threshold, or as long as the parameter has not reached a predetermined final value, the duration of these steps being slaved to the variation of this factor; where necessary, machining at a rate corresponding to the value of the modified parameter; gradual and stepped variation of the parameter, but in the opposite direction, so as to return it to its initial value, as soon as the factor has returned below its critical threshold.

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First Claim