In the manufacturing industry such as aviation, shipping, enginery, car, mould, the part that has complex form side via often can having a few needs to machine, although some spare parts appearance are not complex, but machine program is very long. The numeric computation of these spare partses, program is written, course desired result is quite complex and trival, workload is very big, using manual process designing is finished hard. Right now, the process designing that should use the computer of software of process designing system or Hui of machine of special process designing to complete these parts works. The process that the to program of numerical control machine tool completes by the computer, call automatic process designing. When undertaking automatic process designing, the work that programmer place should do is a basis design and craft requirement, the programming language of use regulation, write a spare parts to machine source program, input its process designing machine, process designing machine undertakes automatically handling to the information of the input, can edit spare parts machine program contrail of motion of cutting tool center, automatically with automatic computation and make perforative belt automatically wait. Because process designing machine contains monitor more, but automatic draw gives part drawing form and contrail of cutting tool motion, programmer can check an order correct, can revise in time when necessary. Use the workload of the person that means of automatic process designing can reduce process designing greatly, improve process designing efficiency greatly, and can solve the process designing difficult problem that uses the complex part with manual inextricability process designing. CNC MillingCNC Machining