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METAL INJECTION MOLDING TECHNIQUE AND PROCESS

Metal Injection Molding (MIM) is a mass production technique to produce intricately shaped metallic components. A variety of metal co-injection molded components has been produced using several model material systems. This means that one type of material can provide the required surface characteristics , such as corrosion or wear resistance, with a cheaper material forming the core of the components. (eg. Iron as core and stainless steel as skin). 

These are : 

1. Feed Stock Mixing : 

 Metal powder is blended with a binder consisting of wax and polymer at about 160*C and   subsequently cooled and granulated to pellets.

2. Molding : 

At about 160*C, the pellets are rammed into the mold at a pressure of 120 Mpa  to for the green molding.

3. Debinding :

Hot air is passed over the components to remove binding materials , resulting in  brown  metal moldings.

4. Sintering : 

 The porous components are heated to 1600*C (for ferrous metal/alloys) at  very  low   pressure (10^-3 Mpa). The particles melts / fuse together excluding air/trace of  binders resulting in white shiny parts. 



Metal Injection Molding Technique and Process





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