Die for convex hull punching

The utility model discloses a convex hull punching machining die which comprises an upper die assembly, a lower die assembly, a punching forming assembly and a material pressing assembly, the upper die assembly comprises an upper die base and an upper die fixing assembly, and the lower die assembly comprises a lower die base and a lower die fixing assembly; the material pressing assembly comprises an upper material pressing block and an upper material pressing spring; the punching forming assembly comprises a punching punch and a convex hull forming assembly. The convex hull forming assembly comprises a first forming assembly and a second forming assembly; the upper pressing block is connected with the upper die fixing assembly through an upper pressing spring. The first forming assembly is fixedly connected below the upper pressing block; the second forming assembly is connected with the lower die assembly and corresponds to the first forming assembly. One end of the punching punch is fixedly connected with