Solid rocket engine semi-dumbbell annular groove grain forming die and forming method

The invention provides a solid rocket engine semi-dumbbell annular groove grain forming die and method, and belongs to the technical field of solid rocket engines. By means of the method, rapid forming of the special semi-dumbbell annular groove grain structure can be achieved, and the application range of core mold charging is expanded. The method is characterized in that preparation of a special combustible core mold assembly is achieved through the additive manufacturing technology, forming of a special grain structure is achieved through a disassembly-free core mold scheme, light weight of the core mold structure is guaranteed through a dot matrix or honeycomb structure, and meanwhile rapid combustion of the core mold structure after ignition is achieved. Forming of the semi-dumbbell annular groove grain structure is achieved, and a rapid and efficient implementation means is provided for design and production of a complex grain structure. Compared with an existing core mold manufacturing process, the cor