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 a new type of net near-molding technology, which uses melting, heating, injection and pressing of metal powder to carry out the required mold molding. For some special materials such as refractory metals, refractory metals, high alloy and so on. So what are the technical advantages of metal powder injection molding technology in parts manufacturing? Let's take a look at zhongwei's precision knitting.

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, individual components were made first and then assembled into components. When using metal injection molding MIM technology, it can be considered to integrate into a complete single part, greatly reducing the steps and simplifying the processing procedure. Compared with other metal processing methods, metal injection molding (MIM) has high dimensional accuracy and 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 in the pressing process.

Due to the friction between the mold wall and the powder and between the powder and the powder, the distribution of the pressing pressure is uneven, which also leads to the uneven microstructure of the pressing blank. This will cause the 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 products, poor material density, low density, and serious impact on the mechanical properties of the 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 in metal injection molding MIM technology, and its life is equivalent to that of engineering plastic injection molding tools.

Due to the use of metal molds, metal injection molding 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 metal injection molding are very wide.

In principle, any powder material that can be cast at high temperature can be manufactured into parts by MIM process of metal injection molding, including difficult-to-process materials and high-melting materials in traditional manufacturing process. The application fields of metal injection molding products have spread across all fields of the national economy and have broad market prospects.

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

The above is the sharing of the Xiaobian of zhongwei. I hope this article will help you. If you want to know more about it, please pay attention to the official website of zhongwei Precision.