The design of the die fully takes into account the advantages of the factory's wire cutting processing. The installation of working parts is basically in the way of hanging table or hanging lug. In order to improve the processing efficiency, the overall dimensions of the female die inserts are designed as much as possible. For example, in the first station of Figure 4, there are 10 punching die inserts with the same overall dimensions, which improves the processing and grinding efficiency and improves the interchangeability of parts.