Loading patent…
AssigneeInoue-Japax Research Incorporated
InventorKiyoshi Inoue
Estimating the term…
EDM method and apparatus in which the electrical discharge machining pulses are produced by the application across the machining gap of a succession of time-spaced trains A of discrete elementary pulses a having an on-time .tau.on and off-time .tau.off, the trains having a duration Ton and an interval Toff. In a machining process, upon occurrence of an arcing, short-circuiting or excessive gap contamination condition, either of the off-time .tau.off or the cut-off interval Toff is increased. When the one controlled time .tau.off or Toff is increased to be greater than a predetermined value, the other, Toff or .tau.off, is decreased generally inversely proportionally to the increased .tau.off or Toff. When .tau.off or Toff is decreased to be smaller than a predetermined level, Toff or .tau.off are increased. Preferably, the sum of total off-times .tau.off plus the cut-off interval Toff in a single cycle or period of successive trains A is maintained at a present value so that the mean machining current is maintained constant as desired.
A method of the electrical-discharge-machining of a workpiece juxtaposed with a tool electrode across a fluid-filled machining gap, the method comprising the steps of:
An apparatus for the electrical-discharge-machining of a workpiece with a tool electrode across a fluid-filled machining gap, comprising:
A method of the electrical-discharge-machining of a workpiece juxtaposed with a tool electrode across a fluid-filled machining gap, the method comprising the step of:
Dependencies are inferred from the claim text.