Metal powder injection molding technology features

What are the main features for metal powder injection molding technology? Let’s take a look.

1.       High efficiency, easy to achieve high-volume and large-scale production

Mold lifetime for metal powder injection molding technology is equal to plastic injection molding mould. Use of metal mold makes metal powder injection molding quite suitable for mass production. The use of injection molding product blank has greatly enhanced production efficiency and reduced production costs. And the good consistency and repeatability of injection molded products thus provide a guarantee for high-volume and large-scale industrial production.

2.       Uniform microstructure, high density, good performance

In pressing process, the friction between powder and die wall and among powder and powder result in uneven distribution of pressing pressure, and also lead to uneven microstructure of casting blank, which would result in uneven shrinkage during sintering process for casting powder metallurgy parts, and therefore had to reduce the sintering temperature to reduce this effect, so that products had large porosity, poor compactness and low density, seriously affect its mechanical properties. Conversely, MIM powder injection molding process is a fluid molding process. The existence of adhesive ensures powder’s even layout, thereby eliminates uneven microstructure in blanks, and that make density of sintered products reach their theoretical density.

What are the advantages of MIM powder injection molding bearings?

MIM powder injection factory ZCMIM （http://www.zcmim.com/）is specialized in the development, production and sales of powder metallurgy products. The rapid development of powder metallurgy industry leads to development and application of powder metallurgy products- powder metallurgy bearing.

Powder metallurgy bearings are forming from metal powders and other anti-friction material powder pressing, sintering, shaping and immersion oil. They have porous structure,  among the pores filled with oil after invasion hot oil. Rotation of pump suction and friction heat result in thermal expansion of metal and oil while working, and oil out of the pores then lubricate the friction surface. Oil sucked back into the pores after bearing cooling.

  

Powder metallurgy bearings don’t need lubrication for a long time. The higher porosity for PM bearing, the more oil. But the more the pores, the lower its strength. These bearings are often in mixed lubrication state, and sometimes can form a film lubrication, commonly be used in absence of supplemental lubricants, light load and low speed situation. Depending on operating conditions choose different oil rates of powder metallurgy bearing.

Large oil content can be applied in the absence of supplemental lubricants and low load; low oil content can be applied for heavy load and high speed. With graphite powder metallurgy bearings can improve safety because of graphite itself lubrication. But its drawback is low intensity. In the case of non-corrosive, it can consider choosing inexpensive, high strength iron-based powder metallurgy bearings, but the hardness of the mating journal should be raised.

What are the advantages of MIM powder injection molding bearings?

MIM powder injection factory ZCMIM （http://www.zcmim.com/）is specialized in the development, production and sales of powder metallurgy products. The rapid development of powder metallurgy industry leads to development and application of powder metallurgy products- powder metallurgy bearing.

Powder metallurgy bearings are forming from metal powders and other anti-friction material powder pressing, sintering, shaping and immersion oil. They have porous structure,  among the pores filled with oil after invasion hot oil. Rotation of pump suction and friction heat result in thermal expansion of metal and oil while working, and oil out of the pores then lubricate the friction surface. Oil sucked back into the pores after bearing cooling.

  

Powder metallurgy bearings don’t need lubrication for a long time. The higher porosity for PM bearing, the more oil. But the more the pores, the lower its strength. These bearings are often in mixed lubrication state, and sometimes can form a film lubrication, commonly be used in absence of supplemental lubricants, light load and low speed situation. Depending on operating conditions choose different oil rates of powder metallurgy bearing.

Large oil content can be applied in the absence of supplemental lubricants and low load; low oil content can be applied for heavy load and high speed. With graphite powder metallurgy bearings can improve safety because of graphite itself lubrication. But its drawback is low intensity. In the case of non-corrosive, it can consider choosing inexpensive, high strength iron-based powder metallurgy bearings, but the hardness of the mating journal should be raised.

Prospects for MIM Powder Injection Molding Process

Compared with conventional technology, MIM powder injection molding process has high accuracy, homogeneous, high performance, and low production cost, which are widely used in electronic information engineering, bio-medical equipment, office equipment, vehicles, machinery, hardware, sports equipment, watches and clocks, weapons and aerospace industries.

Therefore, it is generally believe in worldwide that the development of this technology will lead to a revolution in parts forming and machining technology. It is known as "the hottest parts forming technology" and "21st Century forming technology."

At present, Chinese consumption of iron powder and copper powder have surpassed Japan, ranking first in Asia. In the future, major application  of powder metallurgy parts is still automotive field. In the technical point of view, high-density powder metallurgy parts, new powder metallurgy materials, high efficient and precise equipment etc are the future development trends of powder metallurgy industry.

Future development of MIM Powder Injection (http://www.zcmim.com/) mainly in materials and design. To take advantage of the technology to help customers improve product design and reduce costs, thereby expanding powder injection molding applications.

Advantage of MIM Powder Injection

Along with progress of MIM, MIM powder injection （http://www.sky-mim.com/）cost advantage will be more prominent accompanied by increased cost competition in automotive industry. So that in certain complex structural parts, such as connecting rods, camshafts, bearing caps, tooth components, closed chamber parts, components and other complex structures within the cavity, MIM powder injection substitutes for other industries.

Advantages of MIM powder injection mainly conclude as following aspects:

1. Directly forming complex geometry parts (size usually 0.1 ~ 100g);

2. Precision can up to 0.5% +/- 0.1% as spare parts, smooth surface, one-time up to Ra3.2;

3. Good interior compactness, high-density, up to 95% to 99%;

4. Uniform internal organization, no composition segregation for alloy.

5. High efficient production , substantial reduce cost for high-volume production.

6. Wide scope of materials, including refractory material, and difficult to cast material and difficult to process material.