Technical advantages of metal powder injection molding process in parts manufacturing

Technical advantages of metal powder injection molding process in parts manufacturing

Powder metallurgy is not only a material manufacturing technology, but also a material processing technology. Then let's follow Xiaobian to understand the technical advantages of metal powder injection molding technology in parts manufacturing.

1. Structural parts capable of forming highly complex structures

The metal injection molding technology uses the injection machine to inject the product blank to ensure that the material is fully filled with the mold cavity, which also ensures the realization of the high complex structure of the part. In the past, in the traditional processing technology, the method of making individual components first and then assembling them into components can be considered to integrate into a complete single part when using MIM technology, which greatly reduces the steps and simplifies the processing procedure. Compared with other metal processing methods, MIM has a high dimensional accuracy of the product, which requires no secondary processing or only a small amount of finishing. The injection molding process can directly form thin-walled and complex structural parts. The shape of the product has approached the requirements of the final product, and the dimensional tolerance of the part is generally maintained within ± 0.1~± 0.3, which is particularly important for reducing the processing cost of hard alloy which is difficult to machine and reducing the processing loss of precious metals.

2. The product has uniform microstructure, high density and good performance during the pressing process. Due to the friction between the mold wall and the powder and between the powder and the powder, the pressing pressure distribution is uneven, which also leads to the uneven microstructure of the pressing blank. This will lead to the uneven shrinkage of the pressed powder metallurgy parts during the sintering process. Therefore, the sintering temperature has to be reduced to reduce this effect, so that the product porosity is large The material has poor compactness and low density, which seriously affects the mechanical properties of products. On the contrary, the injection molding process is a fluid molding process. The existence of the adhesive ensures the uniform distribution of the powder, thus eliminating the uneven microstructure of the blank, and thus making the density of the sintered product reach the theoretical density of its material. Generally, the density of pressed products can only reach 85% of the theoretical density. The high density of the product can increase the strength, toughness, ductility, conductivity and thermal conductivity, and magnetic properties.

3. High efficiency, easy to realize mass and large-scale production of metal molds used by MIM technology, and its life is equivalent to that of engineering plastic injection molding tools. Due to the use of metal molds, MIM is suitable for mass production of parts. Because the injection molding machine is used to mold the product blank, the production efficiency is greatly improved, the production cost is reduced, and the consistency and repeatability of the injection molding products are good, thus providing a guarantee for large-scale and large-scale industrial production.

4. The range of applicable materials is wide, and the application field is wide. The materials that can be used for injection molding are very wide. In principle, any powder material that can be poured at high temperature can be manufactured into parts by MIM process, including the difficult-to-process materials and high-melting point materials in the traditional manufacturing process. In addition, MIM can also conduct material formula research according to user requirements, manufacture any combination of alloy materials, and mold composite materials into parts. The application fields of injection molding products have spread across all fields of the national economy and have broad market prospects.

5. Performance improvement The MIM process uses micron-sized fine powder, which can not only accelerate the sintering shrinkage, help improve the mechanical properties of the material, extend the fatigue life of the material, but also improve the resistance to stress corrosion and magnetic properties.

To sum up, I share the above content here. I hope this article will help you. If you need more information, please pay attention to the official website of Zhongwei Precision.