Powder metallurgy injection molding (MIM) was born in California, USA in 1973. It is a new powder metallurgy molding technology invented by combining plastic injection molding technology with powder metallurgy field.Powder metallurgy is close to the injection molding process with powder metallurgy technology, first the solid powder and organic binder mixing together, through 150 degrees high temperature heating plasticizing, injection mold cavity with injection molding equipment, again is solidified, then use the method of thermal decomposition of binder removal from the billet, the last as powder metallurgy, precision by sintering parts
Powder metallurgy press molding is the use of powder relying on gravity to fill the mold, through machine pressure extrusion molding.In the practical industrial application is the most widely used one, cold closed steel die pressing, cold isostatic pressure, hot isostatic pressure, warm pressure are pressing molding.However, due to only up and down pressure, some complex structural parts can not be produced, or can only be made into raw materials.