Application of Metal Powder Injection Molding Technology

Application of Metal Powder Injection Molding Technology

In the past, in traditional machining techniques, individual components were first made and then combined into components. When using MIM technology, it can be considered to integrate into a complete single part, greatly reducing steps and simplifying machining procedures. Compared with other metal processing methods, MIM has high dimensional accuracy and does not require secondary processing or only a small amount of precision machining.

The injection molding process can directly shape thin-walled and complex structural components, and the shape of the product is close to the final product requirements. The dimensional tolerance of the parts is generally maintained within ± 0.1~± 0.3, which is particularly important for reducing the processing cost of hard alloys that are difficult to machine and reducing the processing loss of precious metals.

The microstructure of the product is uniform, with high density and good performance. During the pressing process, due to the friction force between the mold wall and powder, as well as between powder and powder, the distribution of pressing pressure is uneven, which leads to uneven microstructure of the pressed blank. This will cause uneven shrinkage of the pressed powder metallurgy parts during the sintering process. Therefore, it is necessary to reduce the sintering temperature to reduce this effect, resulting in large porosity of the product The poor density and low density of the material seriously affect the mechanical properties of the product.

On the contrary, injection molding process is a fluid forming process, and the presence of adhesives ensures the uniform distribution of powder, thereby eliminating the unevenness in the microstructure of the blank and making the sintered product density reach the theoretical density of its material. In general, the density of pressed products can only reach 85% of the theoretical density. The high density of products can increase strength, enhance toughness, improve ductility, conductivity and thermal conductivity, and enhance magnetic properties.

High efficiency, easy to achieve mass and large-scale production of metal molds used in MIM technology, with a lifespan comparable to that of engineering plastic injection molding tools. Due to the use of metal molds, MIM is suitable for mass production of parts. Due to the use of injection molding machines to form product blanks, production efficiency has been greatly improved, production costs have been reduced, and the consistency and repeatability of injection molded products are good, providing assurance for large-scale and industrial production.

The range of applicable materials is wide, and the application field is wide. Materials that can be used for injection molding are very wide. In principle, any powder material that can be high-temperature poured can be manufactured into parts using the MIM process, including difficult to machine materials and high melting point materials in traditional manufacturing processes. In addition, MIM can also conduct material formula research according to user requirements, manufacture any combination of alloy materials, and shape composite materials into parts. The application fields of injection molded products have spread throughout various fields of the national economy, and have broad market prospects. 5. Improvement in performance: MIM process uses micron sized fine powder, which can accelerate sintering shrinkage and help improve material quality