Partial quick-change combination punch for punching when internal high-pressure forming

The invention discloses a partial quick-change combination punch for punching when internal high-pressure forming. The partial quick-change combination punch includes a base matched with a fixture, acutting edge for punching and a straight rod part between the base and the cutting edge. The punch is composed of two segments, an inserting tenon is formed at the connecting end of one punch body, and a tenon opening is formed in the other punch body. Threaded holes with reverse threads and located at the axis are formed in the opposite ends of the two punch bodies. The two punch bodies are connected by a screw with reverse threads at the two ends. An internal hexagonal wrench inserting groove is formed in the end, facing the cutting edge, of the connecting screw, and an axial hole in which ahexagon wrench is inserted is formed in the punch body with the cutting edge. The partial quick-change combination punch has the positive effects that through the design of the segments and a connecting structure after segmenting of the punch as a whole, simple and rapid replacement of faster wearing parts of the punch is realized, the workload of personnel for the punch replacement is reduced, the time for machine halt due to the punch replacement is shortened, the production efficiency is improved, only a part of the entire punch is scrapped, the end with the base can be used for a long time, the consumption of materials is reduced, and reduction of the production cost is facilitated.