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Application of Metal Powder Injection Molding

Due to the use of injection molding, the metal forming process can produce very complex parts with various alloy materials. Its complexity far exceeds any metal forming process including other powder metallurgy processes, including: various external grooving, External thread, tapered outer surface, cross hole and blind hole, recess and key pin, stiffener plate, surface knurling, etc. Therefore, the use of this technology can eliminate cumbersome multiple processing procedures and reduce material consumption. This is the unique advantage and development potential of injection molding. Moreover, in the flowing state, the liquid phase uniformly fills the cavity for forming, and the pressure at each point in the cavity is the same, which eliminates the inevitable density gradient along the pressing direction of traditional powder metallurgy pressing, and achieves a uniform structure and excellent mechanical properties. Of near-net-shaped parts. In addition, the metal powder injection molding technology has the advantages of wide material adaptability, high degree of automation, low production cost, and material utilization rate of almost 100%. Injection molding companies have nearly a hundred products ranging from traditional industrial hard tools and mechanical products to high-temperature engine parts, from computer disk drives to products for the watch industry, medical products, and even military products. Therefore, MIM technology Known as “the hottest part forming technology today”.

In the light weapons industry alone, metal injection molding technology has a huge potential market, and nearly 25% of parts are suitable for production by powder metallurgy injection molding technology.

1. MIM technology is finer than the powder used in traditional powder metallurgy technology,

It uses fine powder with a particle size of about 10μm or less instead of general powder

Powder metallurgy uses powder with a particle size of about 100μm; the range of powder materials used is wider, including: Fe, Ni, Co, W, wC, Ti and various grades of stainless steel powder, etc.

2. After sintering, the powder injection molding blank has a linear shrinkage rate of more than 15%, and can reach a theoretical density of more than 95%, and has sufficient use of strong injection degree. Therefore, the degreasing shrinkage of the sintering solvent should be fully considered in the design of products and molds.

3. The dimensional accuracy of the products produced can reach ±0.3%. For small-sized products with simple shapes, it can reach soil (3~5)μm/mm; the surface finish can reach (roughness 1~5pμm).

4. The product can be densified by hot isostatic pressing, and can also be surface treated by carburizing, electroplating and other processes.

5. Injection waste can be recycled and reused; this technology can be used for large-scale industrial production, as well as multi-variety and small-batch production.