Electrical discharge machining apparatus with discharge current control
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United States of America Patent
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-
Jan 24, 1989
Grant Date -
N/A
app pub date -
Dec 21, 1987
filing date -
Dec 22, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A discharge machining apparatus adapted to permit the supply of discharge current to be cut off without increasing electrode consumption. Arrangements are made to gradually increase the level of discharge current, rather than maintaining the current level of discharge pulse. By doing so, electrode consumption becomes independent of the pulse width of the discharge pulse, so the discharge current can be cut off immediately after an abnormal state such as short circuiting or an instantaneous interruption of the discharge current occurs, eliminating the danger of deteriorating the quality of the machining surface of a workpiece.
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