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Metal Injection Molding (MIM )

Puwin has developed a wide range of MIM components using various materials and featuring diverse structures. MIM is suitable for parts with weights less than 100g, the most common weight is less than 50g, the min weight could reach 0.2g. MIM is suitable for products with the wall thickness less than 6mm and it is very economic for quantities from ten thousands to tens millions.
Puwin boasts extensive experience in product design, development, and mass production. Currently Puwin has established a proprietary MIM technology system with independent intellectual property rights, integrating German BASF catalytic debinding technology and complete vacuum heat treatment technology, while combining near-net-shape forming technology with its mature casting processes.

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    What is MIM?

    Metal Injection Molding (MIM) is an advanced net-shape forming technology for metal components that integrates modern plastic injection molding with powder metallurgy. As a cutting-edge manufacturing process, it has achieved rapid development both within the powder metallurgy sector and across the broader industrial landscape.
    The MIM manufacturing process comprises the following key steps:
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    MIM Product advantages

    Exceptional Geometric Forming Flexibility: MIM allows for one-step forming of metal components with complex geometries, similar to the production of plastic injection-molded products. Complex-shaped metal parts that are hard to manufacture via traditional methods can be formed in a single process.
    Uniform Density, Excellent Surface Roughness, and High Dimensional Precision:
    1)MIM parts feature uniform density and excellent surface finish, with surface roughness typically reaching Ra 0.8–1.6 μm.
    2)Part weights range from 0.1 g to 200 g, and dimensional precision is controlled between ±0.1% and ±0.3%, eliminating the need for subsequent machining in most cases.
    Wide Material Adaptability and High Production Efficiency:
    MIM is compatible with a broad range of metal materials, supporting applications across diverse industries.It offers high raw material utilization, a high degree of production automation, and simplified processes, enabling continuous and large-batch production.
    Stable Quality, Reliable Performance, and Versatile Post-Processing Capabilities:
    MIM parts achieve a relative density of 95%–99%, ensuring stable quality and reliable performance.They can undergo heat treatment processes such as carburizing, quenching, and tempering, as well as various subsequent surface treatments.The parts exhibit excellent mechanical properties (including high strength, hardness, and ductility), along with good wear resistance, fatigue resistance, and uniform material texture.

    Application range:

    Electric tools
    Vehicle components and mechanical structural components
    Terminal components of mobile internet
    Military and aero components
    Medical components

    MIM compare with other manufacture methods:

    Comparision between MIM and Powder metallurgy
    1. MIM could manufacture products with complex shapes and does not need secondary machining.
    2. MIM products are of high density, good corrosion resistance, high intensity and good ductility.
    3. MIM could manufacture 2M-PIM products for improving product's applicability.
    Comparison between MIM and Machining
    1. MIM design could save materials and reduce weights.
    2. MIM material could be used repeatedly from the injection gate without affecting product's properties, the material usage is very high.
    3. MIM could form complex products once by molds, which avoids multiple machining processes.
    4. MIM could manufacture parts with complex shapes, which couldn't be done by machining.
    Comparison between MIM and Precision casting
    1. MIM could manufacture parts with thin walls, the min thickness could rea 0.5mm.
    2. The roughness on the surface of MIM products is better than casting.
    3. MIM is more suit to manufacture blind holes and thin-long holes.
    4. MIM could quickly manufacture small parts in batches with low cost.

    detail pictures

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