Lianyungang Dongmu Powder Metallurgy Plant will usher in a qualitative leap in 2021

Introduction to Lianyungang Dongmu MIM and Application of MIM Process

Dongmu Group acquired Shanghai Fuchi, and two influential powder metallurgy enterprises, MIM metal injection molding and PM conventional pressing powder metallurgy, joined hands to expand the construction of Lianyungang Dongmu New Materials Co., Ltd. in Lianyungang. Today, I visited the MIM production base. MIM injection molding is a powder metallurgy technology evolved from plastic products. In daily life, plastic products made by injection molding have low cost and complex shapes. Because of the low price and the difference of materials used, the quality is insufficient. Simply put, the plastic product process is to heat the plastic to the flowing state, and then stop on the mold. This process is similar to the traditional metal casting, but the product has high precision and finer surface state.

Outsiders may not be familiar with the jargon of powder metallurgy. For example, PIM represents powder, MIM represents metal powder, PM represents conventional compaction, CIM represents ceramic powder, but the process is basically similar. When injection molding is carried out by filling metal powder or ceramic powder dispersed in the polymer, the filler polymer is usually a composite material that requires higher strength, better conductivity and other requirements.

The purpose of expanding Lianyungang Dongmu New Materials Co., Ltd. is to build a high-tech MIM production base, fully meet the needs of modern MIM injection molding products, and vigorously cultivate and recruit * * * technical talents to make greater breakthroughs in MIM powder metallurgy technology.

At present, the progress of MIM process is to * * * limit the increase of solid powder content and remove polymer binder during sintering. In this way, a new powder forming process is created. The process can produce products with complex shape, low cost and excellent performance. Here are some important steps:

1. Mix the powder with binder, solvent and lubricant to make particles

2. Injection mold

Degreasing and sintering

4. Follow up treatment of finished products

In addition to the main advantages of complex shape, low cost, high performance, etc., MIM injection molding also has the ability to form geometric shapes, which can * * * limit the reduction of product processing, * * * limit the reduction of waste rate, and realistically mass produce concept parts. By using the existing computer simulation methods in plastic technology, more parts and mold designs can be obtained through MIM injection molding. The equipment investment of powder injection molding is relatively low compared with other molding technologies. The production process is highly automated, the product surface is in good condition, and the mold cost is not high. Because it is suitable for mass production.

The final density of powder metallurgy products * * * produced by MIM technology is more uniform than that of PM. This is because there is friction between the powder and the mold wall during general molding, the pressure of the pressure blank is different, and the density of the pressure blank produced in the final production of * * * is uneven. The final influence of injection molded products is the porosity that affects the strength, toughness, plasticity, conductivity and magnetic response characteristics of the products. The higher the porosity, the better the performance. At present, powder injection molding can be used to produce silicon nitride, silicon carbide, superalloys, intermetallics, cobalt based alloys, ceramic fiber reinforced ceramics or metal matrix composites in addition to steel, stainless steel, aluminum oxide, cemented carbide and tungsten based polymeric gold that can be used in powder metallurgy processes.

The following is a description of the general application areas of MIM products.

1. Computer and auxiliary facilities: printer parts, cores, pins, drive parts, etc.

2. Tools: main drill, drill, electric tools, hand tools, wrenches and other parts, milling heads, nozzles, etc.

3. Home appliances: shell, watch chain, electric toothbrush, scissors, fan, golf head, simulated jewelry, tool head and other parts;

4. Electrical components: micro motor components, electronic components, sensors, mobile phones, BPM components, etc.

5. Machine parts: small and complex parts of cotton feeders, textile machines, sewing machines, office machines and other machines;

6. Gold shaped hard nozzles for oilfield drilling.

7. Auto and marine accessories: clutch inner ring, rocker arm insert, fork sleeve, distributor sleeve, auto airbag accessories, auto lock, turbocharger, etc.

8. Medical field: surgical forceps, forceps, etc.

Read and expand the Advantages of MIM Injection Molding Technology

1. High efficiency, good at producing mass production parts

MIM technology uses molds. Because of the high degree of production automation, the service life is similar to the engineering plastic injection molding mold. Because of the use of metal molds, MIM is suitable for the mass production of parts.

2. More refined parts

Alloying has good flexibility, wide application range of materials, product density of 95%~99%, uniform internal organization, no internal stress and deflection angle, good surface finish, high precision, and general tolerance of 0.05 mm.

3. Substantial energy conservation and disaster reduction

MIM can almost use most metal materials. Considering the economic benefits, the main application materials include iron base, nickel, copper, titanium fund or alloy. Generally, the utilization rate of metal processing and forming is low. For example, the utilization rate of raw materials for the metal shell of LeTV MAX mobile phone is less than 10%, and most of the aluminum alloys become slag. In theory, MIM can be used 100%, greatly improving the utilization rate of raw materials.

4. Forming structural components with very complex structures

Generally, the tolerance accuracy of MIM can reach 0.5%, and higher dimensional accuracy can be obtained together with other processing methods. Basically, all the structures that can be realized by the injection mold can be used in MIM.

5. Environmental protection and safety

It is a pollution-free near net forming technology that can realize continuous large-scale clean production and effectively avoid material waste.

6. Select more materials

Most metal materials can be used in MIM. Considering the economic benefits, the main application materials include iron base, nickel base, low alloy, copper base, high-speed steel, stainless steel, gram valve alloy, hard alloy and titanium fund. Lianyungang Dongmu New Materials Co., Ltd. has both PM and MIM industries and enterprises of a certain scale. MIM combines the advantages of powder metallurgy and plastic injection molding technology, breaking through the product shape limitation of traditional metal powder molding process. MIM can make use of the characteristics of metal powder technology for careful sintering, and produce mechanical parts with good mechanical properties and surface quality. At the same time, the plastic injection molding technology can efficiently produce a large number of components with complex shape characteristics. Like watches and ponies use asteroid gears. MIM technology is an injection molding technology for manufacturing high-quality precision parts, which has incomparable advantages over traditional powder metallurgy processing and precision casting methods. Generally, we can see the shadow of MIM technology in mobile phones, medical high-precision medical equipment and surgical tools used in our lives.