Application fields of powder metallurgy MIM injection molding

Dongmu Group acquired Shanghai Fuchi to let two influential powder metallurgy manufacturers, MIM metal injection molding and PM conventional compaction powder metallurgy, work together to build Lianyungang Dongmu New Materials Co., Ltd. and Lianyungang Fuchi Intelligent Manufacturing Technology Co., Ltd. in Lianyungang. This morning, we discussed with President Liang in the MIM injection workshop about MIM related knowledge. MIM injection molding is a powder metallurgy technology evolved from plastic products, Plastic products made by injection molding have low cost and complex shape, and are widely used in engineering systems and daily consumer goods. It is because the price is low to make up for the lack of quality. Simply put, the plastic product process is to heat the thermoplastic to the flowing state, and then park it in the mold. This process is similar to the traditional metal casting, but the resulting products have higher precision and more refined surface state.

At the beginning of contact, I was not familiar with the terms of the industry, such as PIM for powder, MIM for metal powder, PM for conventional compaction, and CIM for ceramic powder. However, the process was basically similar. They were filled with dispersed metal powder or ceramic powder in the polymer. During injection molding, the filler polymer was generally used for requirements such as higher strength and better conductivity. It was a composite material.

The 1 billion yuan invested in Lianyungang to build Lianyungang Fuchi Intelligent Manufacturing Technology Co., Ltd. with an area of 220 mu is to fully meet the requirements of modern MIM injection molding products with the hardware equipment of Fuchi Intelligent Manufacturing Technology Co., Ltd., and at the same time, vigorously cultivate and recruit technical personnel to make greater breakthroughs in MIM powder metallurgy technology.

At present, the progress of MIM process is to make the solid powder content reach * * * and eliminate the polymer binder during sintering. In this way, a new powder forming process is produced. This process can produce products with complex shape, low cost and superior performance. Key steps:

1. The powder is mixed with binder, solvent and lubricant and granulated

2. Inject into the mold

3. Degreasing and sintering

4. Subsequent processing to finished products

In addition to the main advantages such as complex shape, low cost and high performance, MIM injection molding has another major advantage, which is the ability to shape geometric shapes, so as to reduce product processing to * * *, reduce waste rate to * * *, and make conceptual parts into practical production. By using the existing computer simulation methods in plastic technology, MIM injection molding can get more parts and mold design. Compared with other molding technologies, the equipment investment of powder injection molding is relatively low. The production process is highly automated, the product surface is in good condition, and the mold cost is not too high, because it is suitable for mass production of products.

Compared with the conventional compaction technology of powder metallurgy, the final density of powder metallurgy products produced by MIM technology is much more uniform than that of PM powder metallurgy. Because there is friction between the powder and the mold wall during ordinary molding, which results in different pressures on the compacts, and the final density of compacts produced by * * is uneven. It is porosity that ultimately affects the strength, toughness, plasticity, conductivity and magnetic response characteristics of injection molded products. The higher the porosity, the better the performance.

At present, powder injection molding can not only use materials such as steel, stainless steel, aluminum oxide, hard alloy and tungsten base coincidence gold, but also produce silicon nitride, silicon carbide, superalloy, intermetallic compound, cobalt base alloy and ceramic fiber reinforced ceramic matrix or metal matrix composites.

The following explains the typical application fields of MIM products:

1. Computer and auxiliary facilities: such as printer parts, magnetic core, striker pin, drive parts;

2. Tools: such as gun drill, drill chuck, electric tool, hand tool, wrench and other parts, milling cutter head, nozzle, etc;

3. Household appliances: such as watch case, watch chain, electric toothbrush, scissors, fan, golf ball head, imitation jewelry, knife head and other parts;

4. Electrical parts: such as micro motor parts, electronic parts, sensor parts, mobile phones, BP machine parts;

5. Mechanical parts: small and complex parts of various machinery, such as cotton loosening machine, textile machine, sewing machine, office machinery, etc;

6. Various types of special-shaped hard alloy nozzles for oilfield drilling.

7. Automobile and marine parts: such as clutch inner ring, rocker arm insert, shift fork sleeve, distributor sleeve, automobile airbag parts, automobile locks, turbocharger, etc

8. Medical field: surgical forceps, clips, etc. The following Fuji MIM parts display