Metal Injection Molding (MIM) is a combination of Powder Metallurgy (PM) and Plastic Injection Molding. The technology provides alloying advantages of Powder Metallurgy along with Complex shape making capabilities of Plastic Injection Molding. Metal Injection Molding is a “Green technology”
Metal Injection Molding (MIM) technology starts with Feedstock or raw material, which is a combination of metal powders mixed with plastic/polymer binders.
This feedstock is then injected in a Injection Molding machine where feedstock is heated and injected into a die/mold under high pressure and speed similar to plastic injection molding. After injection the die is allowed to cool to room temperature which will give us “Green Part”. The die can have multiple cavities to meet the production requirements.
In the next step a portion of the plastic/polymer is removed. Process of removing the binders is called as “Debinding”
In this process, remaining binders are removed and metal particles weld together to get the solid shape. The density after sintering is almost equal to that of wrought metal.
Four main considerations for determining if a part is a good MIM candidate
2) Annual Volume
|Mass||0.01 g, 0.0004 oz||250 g, 8.82 oz||< 50 g, < 1.75 oz|
|Wall Thickness||0.125 mm,0.005 in||7.62 mm, 0.300 in||2.03 mm,0.080 in|