Cold Isostatic Molding

Compacts small size , shape and relatively simple tungsten alloy powder metallurgy products, can suppress the production of steel , but the large size, complex shape compacts ordinary steel can not be formed , should be used isostatic molding and other methods . Including isostatic cold isostatic pressing and hot isostatic pressing , cold isostatic pressing in which industrial production has been widely applied .

Isostatic high-pressure pump by means of action of the fluid medium ( gas or liquid ) into the pressure -resistant sealed container steel body , the static pressure of the fluid pressure acting directly on the elastic modulus comprising a powder , the powder is at the same time balanced in all directions on the pressure and density distribution and intensity to obtain high green compacts .
Cold isostatic fluid medium used is usually water or oil , soft mode with high-quality rubber or plastic.

Isostatic molding die press forming compared with the general , its advantages are: isostatic pressing , through the colloid applied to the soft mode is pressed over the entire outer surface of the body , can be made of complex shape , density , height and diameter ratio can be arbitrarily selected compacts , pressed , the powder with a small elastic relative movement of the mold , so the friction loss is small, the desired unit low pressure, density, green density and intensity are high, easy to transport and mechanical processing, and soft mold manufacturing cost is also low.

Isostatic pressing equipment : isostatic pressing Major equipment for isostatic press , the combination of mold and automatic loading machinery. In this case, only introduce cold isostatic pressing machine and soft mold production.

Cold isostatic pressing machine: cold isostatic pressing machine mainly by the high pressure vessel and fluid pressure pump components with fluid storage tank , pressure gauge , high pressure fluid transport pipes, high-pressure valves.

Industrial application of cold isostatic presses are mainly three types : rod isostatic press , screw-type isostatic presses , isostatic presses rack cabinet .

Soft mold making and technical requirements

Mold material selection and mold making : The different powder materials in the isostatic molding require different pressures , the static pressure of the metal powder 43-219MPa, carbide ceramics 70. 4-219MPa. Accordingly , the tungsten powder, isostatic pressing mold material need to be a certain degree of strength and flexibility should , loaded powder can keep the original geometry ; has a high anti-wear properties; ease of processing ; no pressure medium from physical and chemical effects ; material is not easy on the adhesion of the compacts , long life and low price .


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