Research and development of ZCMIM hard alloy technology

Have a small series from the data that the British hard alloy Association and the British Nonferrous Metals Technology Center, since 1985 began to study hard alloy injection molding technology. Key characteristics of the powder, adhesive technology, blending, rheological property, flow and deformation, extrusion forming agent rate, sintering and forming a complete product, the study involves many related fields. Let's look at a series of research reports the powder metallurgy material hard alloy technology:

(1) the rheological properties of hard alloy powder is poor, should not use the hard alloy powder mixture volume ratio higher than 65% for injection molding;

(2) polar wax used, mainly because of the lignite wax ester, rheology suitable for powder injection molding, powder mixture can produce high volume percentage and meets the requirement of the. This kind of wax and beneficial to the volatilization kinetics, he but degreasing work in under the control of, and very small paraffin in the shear stress under the influence from low volume percentage of the mixture, the segregation tendency. Full use of lignite has crystallization ester wax cracking tendency in the blank, but this by mixing appropriate proportion of different types of wax can be adjusted;

(3) the high shear melt mixing technology can effectively produce the mixture evenly;

(4) through the analysis of the rheological behavior and the viscous flow activation energy, the effective evaluation of the formability of the prescription. Influence of process parameters of temperature has significant influence on formability. The mould design plays a key role in shaping the integrity, to avoid the formation of injection mold filling behavior, otherwise prone to defect injection;

(5) the debinding atmosphere has key influence on the microstructure of sintered products. Inert atmosphere produce carbon defects, while reducing atmosphere can make the sintering product having a clear microstructure;

(6) after sintering shrinkage and die geometry and injection pressure, but in the forming of products is consistent with the contraction of each batch. General linear shrinkage rate is 17%, but it is not isotropic, the reason may be due to forming the mold cavity pressure field and temperature field gradient should be. Sinter density is greater than the theoretical density of 99%.

Shenzhen ZCMIM the company also launched a study of hard alloy injection molding process, in order to improve the hard alloy powder loading process to find suitable solutions, with hard alloy made of MIM parts products, ZCMIM will strictly, mainly with the quality and performance of the application, welcome friends you have the demand to support us, and ZCMIM together!

Research progress of cemented carbide MIM Technology

Cemented carbide injection molding, powder injection molding, MIM technology, injection molding(www.zcmim.com)

As early as in 1977 Curry obtained using paraffin wax as the binder of cemented carbide injection molding technology patents, and later transferred to the Leco company, becoming the Leco process. But due to single component wax binder will lead to skim over a long period of time, it is easy to produce defects and other issues, the scope of the patent has little effect on. But in the 1980s, with the breakthrough of MIM in adhesive formulations, degreasing technology, which on hard alloy injection forming technology matures provides strong technical support, coupled with hard alloy injection molding technology of its unique advantage, from the early 1980s is within the scope of world emerged a group engaged in hard alloy injection forming production and research of the manufacturers and research institutions.

Leco Carbide Corporation of the United States under the Leco Corporation of a branch, the company is the first to use injection molding method of production of carbide products company. The company adopts two kinds of production methods of WC based hard alloy, a kind of is suppress the traditional sintering method, products accounted for 60% of sales; another is the new hard alloy injection molding) carbide injection molding) method, the product sales accounted for 40%. The company's CCIM product weight in the range of 0.3-2kg, the maximum diameter of 10.59 inches.

The company is said to be the world's largest manufacturer of hard alloy injection molding products. German MIM company from the beginning of the 80's Degussa research, 1986 officially out of the product. They used polyethylene, polypropylene, polystyrene, thermoplastic plastic and wax, resin and other special additives mixture for forming agent, the with about 0.8 m of WC Co alloy powder mixed and granulation, injection molding, binder removal and fired. The company is mainly engaged in the feed rack as well as the cutting tool of the whole or the first - class production.

Now they have been able to follow the requirements of the user to carry out a small batch of multi variety, multi material production. The largest volume of the product is 1000cm3, the longest is 100mm, the maximum weight is about 100g, the deviation of the product is about 0.3%, the thickness is 1-5mm, the final density can reach more than 95% of the theoretical density. Also Forn physical company production of tungsten carbide base hard alloy rotary chisel, binders binary above, the first component with chemical solvent extraction removal, residual thermal plastic binder in sintering removal. Many other manufacturers such as Singapore Phimax company, IBM, all parts of the country, such as Qingdao, Shanghai, Beijing, Shenzhen, powder injection Manufacturing Co., Ltd., have invested the CCIM technology research and production, output in steady rise.