Dry-bag isostatic pressing

Dry-bag isostatic pressing 

Isostatic pressure forming method according to PASCAL's principle developed a new type of powder forming and consolidation technology, the use of liquid medium incompressibility and uniform transfer of pressure of a forming method. PASCAL's principle is also known as the static pressure transfer principle, which means that the pressure applied to the liquid in the sealed chamber can be transferred in all directions with constant magnitude. The mold filled with powder is placed in a high-pressure vessel. The mold becomes very soft under high pressure, like water, and the pressure is the same as that of still water at the same depth.

What is dry bag isostatic pressure

Dry bag isostatic pressing is the process of filling a flexible preformed die with ceramic powder in batches and then applying isostatic pressing. Since the die is fixed to the device, the formed product is pushed out when the pressing is complete.

Dry bag isostatic pressing has short molding cycle and long service life, which is especially convenient for large-scale continuous chemical industry production. The mold material used is polyurethane synthetic rubber or silicone rubber. Compared with wet bag type isostatic pressing, dry bag type isostatic pressure is lower, generally within 200MPa. The most familiar ceramic spark plug is currently formed by dry bag type isostatic pressing, pressing time is usually only 1~2s.

Dry bag isostatic pressure characteristics

1. Double-bag or three-bag system: It is composed of a main bag, an intermediate bag (without this intermediate bag in double-bag) and a material bag (charging mold). The main bag and the intermediate bag are fixed in the cylinder. After the powder is loaded into the bag, it is put into the middle bag and pressurized. After forming, it is taken out of the cylinder block by the piston. The addition and removal of billet and the entry and exit of bag are carried out in the dry state, and the bag does not directly contact with the liquid medium in the whole process, so it is called dry bag molding.

2, Forming billet quality is better: pressed billet straightness is good, higher finish.

3, High utilization rate of powder: compact size is easier to control, small tolerance size.

4, Short production cycle: powder without prepressing, pressing can be sintered, no additives or only a small amount.

5, High efficiency and environmental protection: dry bag molding can be continuous operation, suitable for mass production, high efficiency, truly realize the efficient and environmental protection production of high-quality products.

Jiangsu High Tech Co., Ltd. is located in Zhenjiang, Jiangsu. It is a high-tech enterprise that develops and produces high-performance polyurethane products, cold isostatic pressing molds and cold isostatic pressing machines. The company's main products are polyurethane isostatic pressing molds and cold isostatic pressing machines. The company's products are widely used in all walks of life in China and exported to more than 30 regions around the world. They are widely praised by customers for their excellent quality and good service. The company always adheres to the product concept of "quality first" and has a deep understanding of customer needs. The company has been committed to the research and development and production of high-performance polyurethane elastomer molds for many years, and solves various design and production problems of polyurethane elastic molds for isostatic pressing users. The company has mature production and processing technology and a complete set of experimental equipment for mold elastomer analysis. In order to ensure the excellent impact resistance, abrasion resistance, cutting, tear resistance and clarity of the product and excellent dimensional stability. Its products are widely used in magnetic materials, ceramics, cemented carbide, high temperature refractory materials, rare earth permanent magnets, carbon materials, rare metal powders and other industries.

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.

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