| 摘要 |
PURPOSE:To reduce a machining time when a blanking die is machined through the method of wire cut electric discharge machining, by roughing the connection part, between the blanking die and a work, except plural places and then finishing the work. CONSTITUTION:A wire electrode 7 is inserted into an extended-through hole A previously drilled in a work 6 to perform roughing work along a locus 8 from a machining start point (a), and machining work is stopped at a position (f) to cut off the wire electrode 7. Then the wire electrode 7 is inserted into an extended- through hole B to perform roughing work along a locus 9 from a point (g) to positions h i. The wire electrode 7 is notched by the distance t at the point i further its state of electric discharge machining is converted into finishing work then machining is reversely performed along a locus 10 to j f' k l. A blanking die 5 is cut down by its own weight at a point l to complete the machining work. In this way, the blanking die with small roughness of its machined surface can be machined in a short length of time. |
