METHOD AND APPARATUS FOR ELECTRIC DISCHARGE MACHINING OF INSULATING MATERIAL

摘要

PROBLEM TO BE SOLVED: To machine an insulating material M, by electric discharge machining, with high machining accuracy by stabilizing the electric discharge phenomena during the transition of the electric discharge phenomena from a conductive material layer L to the insulating material M in electric discharge machining of the insulating material M coated by the conductive material coating film L. SOLUTION: When the insulating material M is machined by electric discharge machining by applying a voltage between the insulating material M soaked in dielectric machining fluid 3 and an machining electrode 7, the insulating material M having a conductive material layer L formed thereon is used and a resistor 5 is connected in series on the way from the insulating material M to an electric discharge power source. Instead of the resistor 5 or in addition to the resistor 5, the conductive material layer L of high resistance may be formed.