METAL HOLLOW BODY FOR ELECTRIC DISCHARGE MACHINING, AND ITS MANUFACTURING METHOD

摘要

PROBLEM TO BE SOLVED: To provide a structure of a super-fine metal hollow body forming the electrode and its manufacturing method, and realize the super-fine drilling by the characteristic of an improved electrode without using any complicated apparatus in the prior art. SOLUTION: A plurality of wires formed of a first metal 3 are spirally twisted to form a hollow structure of a super-fine metal hollow body 10 for the electric discharge machining, a second metal 2 is welded in a spiral recess 5 formed between at least the wires adjacent to each other, and the melting point of the second metal 2 is lower than the melting point of the first metal 3.