Electric heating – Metal heating – Cutting or disintegrating
Patent
1992-05-18
1994-11-29
Evans, Geoffrey S.
Electric heating
Metal heating
Cutting or disintegrating
219 6916, 219 6917, 219 6918, B23H 102, B23H 718, B23H 716
Patent
active
053692390
ABSTRACT:
A touch-type sensor is employed to detect the precise location of a corner of a machining electrode that may be susceptible to pyrographite buildup prior to actual machining of a workpiece. By detecting the precise location in this manner, a base or origin value can be maintained for subsequent comparison when the electrode is periodically checked for icicle formation or electrode erosion. When a deviation from the base or origin value is determined, one or more of a plurality of machining parameters, such as machining on time, wear ratio, fluid flow rate, or jumping height is modified in accordance with the amount of deviation detected. In order to further optimize the machining rate of the workpiece, the surface area of the electrode is periodically determined. The aforementioned machining parameters are varied accordingly, so that the optimum average current across the inter-electrode gap, as it relates to surface area, may be maintained. Furthermore the temperature at the surface of the machining electrode can be periodically determined. As the temperature at the surface approaches the critical temperature for pyrographite buildup and the like, the machining parameters can be modified to achieve the optimum machining rate.
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Evans Geoffrey S.
Mitsubishi Denki & Kabushiki Kaisha
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