Sometimes called Powdered Injection Molding (PIM), is an advance metal forming technique that uses injection molding equipment for manufacturing both simple and complex metal parts to tight tolerances. The process involves combining metal with a binder that is injected as a liquid into a mold. The molded or “green part” is cooled and ejected from the mold. The molded part is then sintered (heated) to temperatures near the melting point in a protective atmosphere furnace to densify the particles using capillary forces in a process called Sintering. If performed in vacuum, it is common to reach 96-99% solid density. The end-product metal has comparable mechanical and physical properties with annealed parts made using classic metalworking methods. Post sintering heat treatments for MIM are the same as with other manufacturing processes.
By Brian Huegel /