Wet type isostatic cool pressing die

Abstract

The invention provides a wet-type cold isostatic pressing mold, which includes a mold body and a mold cover plate. During operation, a sealing device is used to seal and fix the mold cover plate on the mold body. It is characterized in that the mold body is composed of a soft inner sleeve and a control The outer part of the soft inner sleeve is the control mold, the soft inner sleeve is attached to the inner wall of the control mold, and there are several diversion holes distributed on the control mold. The holes conduct pressure uniformly to the soft inner sleeve. The wet cold isostatic pressing mold of the present invention has a reasonable structure and is easy to operate, and can withstand the wet cold isostatic pressing forming with a production pressure of 60‑220Mpa, protects the materials inside the mold from erosion, and most importantly can make the cold isostatic pressing The molding technology achieves one-time molding of near-net size, which ensures the accuracy of one-time molding of the green body to the greatest extent, improves production efficiency and reduces manufacturing costs.

Description

technical field [0001] The invention relates to a wet-type cold isostatic pressing die, which belongs to the technical field of pressing dies for ceramics and powder metallurgy. Background technique [0002] Isostatic pressing technology is a technology that uses the products in a closed high-pressure container to form under the state of uniform ultra-high pressure in all directions. It is mainly used in powder forming of powder metallurgy, and has a wide range of applications in ceramic casting and other fields. According to the temperature during forming and consolidation, isostatic pressing technology is divided into three different types: cold isostatic pressing, warm isostatic pressing, and hot isostatic pressing. Cold isostatic pressing is to use liquid as the pressure medium at room temperature to form powder materials and provide green bodies for further sintering, forging or hot isostatic pressing processes. Cold isostatic pressing is divided into two types: wet ty...

AI Technical Summary

Problems solved by technology

[0003] The existing wet cold isostatic pressing molding technology mostly uses polyurethane or rubber as the mold. The mold itself has a relatively large thickness and has no support frame, which is likely to cause uneven pressure. Therefore, the size of the green body is difficult to control and difficult to One-time molding of near-net size will increase the workload of subsequent green body processing; moreover, most of the products made are round rods or hollow rods with simple shapes

In addition, most of the current wet cold isostatic pressing in production requires secondary pressure treatment. The production process usually requires two processes of pre-pressing and isostatic pressing to increase the density of the green body, and is rarely used as a primary pressing of the green body. This has led to complex processes, long production processes, increased production costs and disadvantages in controlling product quality.

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