METHOD OF FORMING TOOL ELECTRODE FOR ELECTROSPARK MACHINING AND FORMING PUNCH OF TOOL ELECTRODE FOR ELECTROSPARK MACHINING

摘要

PURPOSE:To improve forming of an electrode face for electrospark machining in forging of a tool electrode for electrospark machining by a model punch by providing a bank of specified height around the uneven shape forming part of the model punch and thereby checking the flow of metal around the face of the electrode tool. CONSTITUTION:A bank 14 of height corresponding to the height of projection is provided around the shape of a model punch male die 10 made of steel. The bank 14 checks the flow of metal at the time of forging the tool electrode for electrospark machining 20 made of copper and makes a good tool electrode. By making electrospark machining of an actually used steel punch 30 by using this electrode 20 for machining, the actually used steel punch 30 is formed to a good shape free from shear droop.