A mold is made with a large group of spare parts, spare parts quality directly affects the quality of the mold, and the final quality of the part is made of fine processing to complete the guarantee, so that good control of finishing major. In the majority of domestic mold manufacturing enterprises, the finishing stage adopts the methods of grinding, electrical machining and fitter processing. At this stage to control the deformation, stress, tolerances and the size precision of many technical parameters in the production practice, the operation more difficult, but there are still many effective methods of experience is worth learning...