MIM (Metal Injection Molding)
The MIM (Metal Injection Molding) process was developed in the early '90s in the United
States , mainly for use in the military sector. In the following years MIM usage and
design capabilities have grown greatly. This is due to interest shown by a growing number
of industries where parts made by the MIM process can be used. These industries include
but are not limited to Automotive, Medical, Firearms/Military, Cutlery, Hand tools,
Power tools, Optics and Electronics.
The advantage of the MIM process is making average to small pieces with a complex shape
or three dimensional shapes in medium to high volume quantities of very high strength.
These parts are made in high strength ferrous materials. Automation is heavily used in
the MIM process to maintain high repeatability and high quality parts. The molding process
is very much like plastic injection with the machines and tools very similar in design and
The Malleability of Plastic, The Tenacity of Steel
DYNACAST is able to bridge
the gap between metal and plastic by applying the science
of plastic injection molding to hard, high-melting alloys. The resultant advantage is
flexibility in design with the capability to produce complex shaped components, in large
volumes in a cost-effective manner. With Metal Injection Molding (MIM).
This unique technology involves injecting a feedstock of virgin metal powder and a
proprietary binder system into a mold. The binder is removed from the green part by a
proprietary rebinding process and the part is then sintered. The result is a highly dense,
complex shaped MIM part, exhibiting wrought material like properties.
What makes MIM so attractive is the fact that the process is fast and flexible, with the
capability to produce millions of parts per year. Further, the technology guarantees
superior surface finish and shape integrity.
Like wrought material components, MIM parts can have any secondary operations that need to
be carried out. These include :
- Heat Treatment / Case Hardening
- Conventional Machining
- Grinding / Honing
- Tumbling / Burnishing
- Electro-Polishing / Plating
During sintering, the parts shrink dimensionally by about 20% as they shed their binder
content. Yet, our expertise ensures that they retain geometry and the desired tolerance.