CIP Molds for Powder Metallurgy

CIP Molds for Powder Metallurgy

Powder metallurgy compacting machine compaction is the process of compacting the powder in the mold or other containers into a compact of predetermined shape and size under the action of external force. The powder is loaded into the female mold, which is pressed by upper and lower punches. During the compression process, as the powder moves and deforms, the larger voids are filled, the oxide film on the surface of the particles is broken, and the contact area between the particles increases, so that the attraction between the atoms is generated and the mechanical wedging between the particles is enhanced. Thus forming a compact with a certain density and strength.

The pressure acts directly on the powder body or the elastic mold sleeve, so that the powder body is evenly pressed in all directions at the same time to obtain a compact with uniform density distribution and high strength. According to its characteristics, it can be divided into two categories: cold isostatic pressing and hot isostatic pressing.

Cold isostatic pressing is isostatic pressing at room temperature, and the liquid is the pressure transmission medium. Put the powder body into the elastic mold, place it in a steel body sealed container, press the liquid into the container with a high-pressure pump, and use the characteristics of the liquid to transmit pressure evenly, so that the powder body in the elastic mold is evenly pressed. Therefore, cold isostatic pressing has high density, uniformity, good mechanical properties, large size and complex shape, and has been used in the production of bars, pipes and large products.

Hot isostatic pressing of powder metallurgy puts the powder compact or the powder body in a special container into the high pressure container of the hot isostatic press, and applies high temperature and high pressure to make these powder bodies be pressed and sintered into dense parts or materials the process of. Isostatic pressing at high temperature can activate the occurrence of diffusion and creep phenomena, promote atomic diffusion and recrystallization of the powder, and plastic deformation at a very slow rate, and the gas is the pressure transmission medium. The powder body is subjected to the combined action of high temperature and high pressure at the same time in the isostatic high-pressure container, which strengthens the pressing and sintering process. The pressing pressure and sintering temperature of the product are lower than cold isostatic pressing, and the product has high density and strength, and Uniform and consistent, fine grains, high mechanical properties, eliminating defects and pores between particles inside the material, and the shape and size are not limited. But the hot isostatic press is expensive and requires a lot of investment. Hot isostatic pressing has been used in the production of powdered high-speed steel, refractory metals, high-temperature alloys and cermets.

     Jiangsu High Industry on the research and development and production of high-performance polyurethane isostatic pressing molds. Through in-depth cooperation with many isostatic pressing equipment manufacturers and in-depth study of the industry, the developed isostatic pressing polyurethane mold series products have the characteristics of long service life, high precision, small deformation, easy demoulding, etc., and are widely used in ceramics, etc. Static pressing mould, cemented carbide isostatic pressing mould, rare earth permanent magnet material isostatic pressing mould, graphite isostatic pressing mould, etc.

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