Development of metal injection molding


Metal injection molding can be traced back to the powder injection molding preparation of ceramic spark plugs that began in the 1920s. In the following decades, powder injection molding mainly focused on ceramic injection molding. It wasn't until 1979 that the metal injection molding products of Parmatech formed by Wiech and others won two awards. At that time, Wiech and Rivers were granted patents. Powder injection molding began to turn to metal injection molding.


In the past, due to the lack of suitable powders and too high prices, incomplete knowledge platforms, immature technology, not long time for people to understand and accept the market, too long production (including mold manufacturing) cycles, insufficient investment, etc., their development and application were relatively slow.


In order to solve the difficulties of MIM technology and promote the practical application of MIM technology, in the mid-1980s, the United States formulated a plan for advanced powder work. The research content covered 18 topics related to injection molding. Subsequently, Japan, Germany, etc. also actively carried out the development and research of MIM.


Wiech established Witec in 1980, Brunswick entered the MIM industry in 1982, and acquired Witec, and then gradually registered Omark Industries, Remington Military Products, Rocky Dental and other subsidiaries. In 1986, the Japanese company Nippon Seison introduced the Wiech process. In 1990 Israel Metalor2000 company introduced Wiech process technology from Parmatech Company and established MIM production line.


With the continuous deepening of MIM research and the development of new binders, continuous improvement of milling technology and degreasing technology, it has achieved industrialization by the early 1990s. After more than 20 years of efforts, MIM has become a new type of near-net-shape forming technology that has developed rapidly and is most promising in the field of powder metallurgy.



MIM products usually have the following characteristics

The most suitable wall thickness for MIM is no more than 6mm. Thicker outer wall is acceptable, but the cost will be increased due to the longer processing time and extra material used. In addition, u



What is the density and strength of MIM products?

The density of a typical MIM is theoretically higher than 98%. Specific density characteristics depend on the choice of material, but it is very close to precision materials.





Metal injection molding technology in detail

Metal injection molding (referred to as MIM) is a technology combining powder metallurgy and injection molding, which breaks through the traditional powder metallurgy product shape and strength limitations, also breaks through the strength limitations of die casting, breaks through the material flow restrictions of stamping molds, and breaks through precision. Mass production restrictions for casting and high cost constraints for turned parts.



The market competition pattern of 3D printed metal powder may change

The market competition pattern of 3D printing metal powder will change as more companies enter or increase their production and R & D efforts in the field of metal powder. In 2016, GKN, Oerlikon and Alcoa made active strategic plans.



Rich variety of raw materials, and the variety of domestic powder metallurgy products has been expanded

In terms of raw materials, at present, the main raw materials of powder metallurgy in China are not only reduced iron powder, electrolytic copper powder, etc., and domestic production of atomized iron powder, stainless steel powder, high-speed steel powder, coated powder and various element metal MIM powder, Ceramic powders can basically meet the needs of domestic production of high-strength parts, and can also produce raw material powders for special purposes, which greatly expands the variety of powder metallurgy products, but there is still a large gap in quality and variety from abroad.

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