The MIM, , short for the metal powder injection molding process, is a new style manufacture technology that combines plastic injection molding process with powder metallurgy process. As a pure shaping technology that makes precise parts with high quality, MIM has the advantages over common powder metallurgy processing and machining. MIM is suitable for producing a large number of parts in complicated shape, such as diversified external cutting slots, external thread, tapered outer surface, cross through hole, blind hole, concave keying pin, strengthening tendon plate, carved design, etc. The MIM parts seldom need machining again. It decreases the waste of the material so that the MIM will be more economical than the machining with the quantity of the complicated parts over the constant value.