Isostatic pressing device, dry bag type isostatic press and isostatic pressing method

Abstract

The invention discloses an isostatic pressing device, a dry bag type isostatic press and an isostatic pressing method. The isostatic pressing device comprises a high-pressure cavity; the high-pressurecavity is provided with a high-pressure processing chamber; a dry bag unit and an auxiliary forming part are arranged in the high-pressure processing chamber, and the high-pressure cavity is providedwith a first end and a second end in the first direction; a first end of the dry bag unit is arranged at the first end of the high-pressure cavity; the dry bag unit is used for loading to-be-formed powder; the auxiliary forming part is used for abutting against the second end of the dry bag unit, and when the to-be-formed powder is subjected to isostatic pressing, the auxiliary forming part extrudes the dry bag unit in the first direction; the to-be-formed powder is in a preset shape after isostatic pressing, so that the randomness of the shape of a pressed product is reduced; and therefore,the technical problem that when the dry bag or a mold unit is thin and soft, the shape of the pressed product is random is solved.

Description

technical field [0001] The invention relates to the technical field of isostatic pressing, in particular to an isostatic pressing device, a dry bag type isostatic pressing machine and an isostatic pressing method. Background technique [0002] At present, the isostatic press is widely used in magnetic materials, ceramics, hard alloys, high-temperature refractory materials, rare earth permanent magnet materials, etc. The isostatic press uses oil, water or gas as a medium to apply the same pressure in all directions On the surface of the object, it can make the molded workpiece have high and uniform density, uniform sintering shrinkage and easy processing; isostatic presses can be divided into wet bag method and dry bag method according to different molding methods. Put into a dry bag, seal between the dry bag and the high-pressure chamber, and then pressurize the medium between the dry bag and the high-pressure chamber to form the powder in the dry bag, wherein the powder can...

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Problems solved by technology

[0003] However, it was found that, in the above solution, in a dry bag isostatic press for pressing a tablet or block product, the thickness and hardness of the dry bag or rubber mold have an influence on the pressed product

For example, when the dry bag or rubber mold is thicker and harder, although the shape of the pressed product is more regular, but in the unloading stage, the pressed product is broken by the friction between the dry bag or rubber mold and the powder press risk; in order to reduce the impact of the above friction, when the dry bag or rubber mold is thinner and softer, the shape of the thinner and softer dry bag or rubber mold will be under pressure It presents randomness, which in turn makes the shape of the powder compaction present randomness

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