MIM (Metal Injection Molding) Technology
Powder Injection Molding (MIM) is a net forming process. In recent years, MIM industry has developed rapidly, and is widely used in 3C electronics, hardware accessories, power tools, locks accessories, medical devices and other industries. The main processes of MIM process include: material mixing, injection, degreasing, sintering, and proper post-treatment if necessary. MIM process has the characteristics of high cost performance, high product performance and forming complex parts.
MIM compared with traditional powder metallurgy
MIM generally does not require subsequent process;
MIM parts have excellent corrosion resistance performance,
strength and toughness;
MIM parts have excellent magnetic properties;
Tolerance
Dimensional accuracy of MIM is generally about +/-0.5%, which can be achieved +/-0.3% under special conditions.
Higher precision requirements need higher cost. The following table is the tolerance comparison table.
| Size | General Tolerance |
|---|---|
| 1-4mm | +/-0.05 |
| 4-10mm | +/-0.10 |
| 10-20mm | +/-0.15 |
| 20-30mm | +/-0.25 |
| Features | General Range |
| Part Size | 0.2-50g |
| Wall thickness | Above 0.5mm |
Note: Special tolerance requirements can be achieved by secondary treatment, such as shaping, CNC machining.
Advantages of MIM technology
1.Complex geometry
Because MIM products are formed by a mold similar to the injection mold, a very high
degree of freedom in geometric design can be obtained.
2.Excellent material properties
MIM process usually has a production cycle of 5-7 days,
and can be continuously supplied after a cycle. The daily output can be satisfied from hundreds of pieces to
thousands of pieces according to demand.
3.Suitable for mass production
The high density of MIM products makes them have excellent
material properties, which are close to the properties of sheet metal. Therefore, MIM products are especially
suitable for the parts with special requirements for product performance.
4.Material diversity
It has been proved that most of materials can be produced by MIM
process. But, stainless steel is the best choice.
5.High dimensional accuracy
The dimension accuracy of metal injection molding is generally
about +/-0.5%. And, it can reach +/-0.3% under special conditions.
