| 摘要 |
The invention is concerned with forming a groove (12) with a desired shape in a mold (11) inexpensively, easily and with high accuracy by means of discharge machining. There is provided a method of forming a groove by means of discharge machining, characterized by carrying out discharge machining a plurality of times to form deep openings (18), by inserting a stick-like electrode (17) into a material (11),- while shifting location of the machining so as to connect adjacent deep openings (18) with each other, and forming the groove (12) having a desired shape by means of said connected deep openings. Since it is possible to form the groove (12) with a desired shape by means of a stick-like electrode (17) with a simple shape, productivity is improved and also manufacturing cost is decreased. Further, even if the stick-like electrode (17) wears out, it is sufficient to exchange the inexpensive stick-like electrode (17). Furthermore, groove width (W) can be changed by adjusting pitch (P) between adjacent deep openings (18). <IMAGE> |
