Cold isostatic pressing, referred to as isostatic pressing
Isostatic pressing, also known as hydrostatic pressing, is a method of applying fluid (water, oil) as a transfer medium to obtain uniform static pressure on the material. The powder is encapsulated in a rubber or plastic mold that is sealed off from the fluid, and it is then immersed in a liquid in a pressurized container. The fluid can be glycerin, engine oil, water (rust inhibitor is required) or other non-compressible liquid powders are uniformly press-molded. Usually the pressure used for cold isostatic pressing is between 50 and 300 MPa. When a higher pressure is used, the rate of depressurization must be controlled to prevent the green body from cracking due to the rapid expansion of a small amount of compressed air bubbles due to sudden depressurization.
Compared with dry pressing, isostatic pressing has the following advantages:
① The green body has high density, uniformity, less defects, and the firing shrinkage is lower than that of ordinary dry pressing. Can press parts with concave, hollow, elongated and other complex shapes;
②The friction loss is small and the molding pressure is low;
③The pressure is transmitted from all aspects, the density distribution of the green compact is uniform, and the green compact strength is high;
④The mold cost is low.
Cold Isostatic Pressing Bags(CIP bags/molds)
Compare to traditional rubber cold isostatic pressing bags, the polyurethane CIP bags have significant advantages. As a new polymer material, polyurethane products feature smooth surface, wearing-resistant, anti-fatigue, low deformation rate. The surface of pressed products with polyurethane bags is much smoother than that pressed with rubber bags, thus it possesses better looks and less postprocessing is required. It’s an ideal tool for powder material forming by press process, which can help a company reduce cost and increase efficiency.
Durability and deformation rate are factors that users care most. A long working life of pressing bag can reduce cost and increase production efficiency, while low deformation rate of the bag will enhance precision and yield of products. By close cooperation with material suppliers and great mass of manufacturers of carbide, ceramics and graphite products, we accumulated a lot of experience in this industry and become a well-know supplier of CIP bags.
We support all kinds of customization, if you need it, please contact us.
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