Experienced designers often set up various technological structures when designing machinery. Such as process boss, tool withdrawal groove, hanging hole, lifting ring, manhole, etc. This structure has no direct influence on mechanical properties. But it is convenient for manufacturing, disassembly, positioning, hoisting, maintenance and other technological processes. Therefore, for different functions, there are different requirements for the structure. The same is true of the process screw in the mold. For example, in order to remove the die handle conveniently, an ejector screw is made on the die handle, which can be easily removed from the upper template. However, it is required that this process screw cannot interfere with the installation of the die handle.