Polyurethane Isostatic Pressing Bags

Polyurethane Isostatic Pressing Bags

After the powder filling is completed, the charging port is sealed with an end plug, some use varnish as the adhesive to seal, or no adhesive is required, and it is best to use elastic bands for external bundling, so that during the compression deformation of the end plug , it still has the function of tightening and sealing, and it will not fall off. It is also effective to use iron wire to tie it. In order to improve the quality of the green compact, some products are larger in size. Before the sheath is sealed, a sponge pad or filter paper for filtering is placed between the powder and the end plug to prevent the powder from being taken away during pumping, such as using rubber The cover of the end plug can be inserted into the sponge pad through the rubber plug with the medical injection tube. The other end of the injection needle tube is connected with the vacuum system, which can realize the degassing of the powder in the cover. After the injection needle tube is taken out, the rubber stopper can Self-sealing, the simplest degassing device. The sheathing mold and supporting attachments are easy to be dirty when the powder is loaded into the mould, and should be cleaned well to avoid bringing powder and dust into the high-pressure cylinder. If the cleaning is not clean, the powder will be brought into the medium in the cylinder. When the pressure is released under high pressure, these solid particles have high energy, which is easy to cause erosion damage to the high-pressure seals of the hydraulic system. For this reason, the outside of the covering mold before entering the cylinder must be cleaned, and the liquid medium in the high-pressure cylinder must be replaced regularly.

In order to ensure the shape and size of the product, under normal circumstances, a certain processing allowance is left. Because the strength of the green body is not high enough, it is easy to be damaged when it is directly used for cutting. Usually, biscuit firing is used to improve the strength of the green body, and the precise shape and size required for re-cutting, and there is a margin for firing shrinkage and grinding of the ceramic body. .

In the cold isostatic pressing molding technology, according to the different molding methods, the casing and the mold are divided into the casing mold used in the wet bag method, the dry bag method, and the balanced pressing method. No matter which type of mold it is, it is composed of four basic components: plastic mold, rigid mold, port sealing device and support device.

The covers, end plugs and mold pads we make are made of special polymer materials. In cold isostatic pressing molding, the plastic mold not only functions as a mold, but also transmits pressure to make the powder dense. The mold core and mold of the steel mold are made of metal materials. The size and shape of the rigid mold remain unchanged during the molding process.

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