Metal Injection Molding, or MIM, is considered a next level process when compared to powdered metal. The MIM process allows our customers to achieve the net shape they want without flash and surface imperfections typically associated with the powder metal process. It also allows for more complex geometries to be created in volume and without the need for secondary operations.
A typical plastic mold may have vents ranging from .0005″ deep to .002″ deep, depending on the resin used. A MIM tool with these vent depths would certainly flash. Venting for a MIM tool is often .0001″ to .0002″ deep—nearly 5-10 times smaller than vents used in plastic molds—if venting is added at all. This requires a discipline and attention to detail at every level to achieve the desired results.