Method for preparing sheath for cold isostatic pressing

Abstract

The invention discloses a method for preparing a sheath for cold isostatic pressing. The method includes the steps: combining cut paperboards into a shape required by the size of a product, manufacturing an upper sheath cover and a lower sheath cover, and coating thin films inside and outside the upper sheath cover and the lower sheath cover; filling powder on one sheath cover after the upper sheath cover and the lower sheath cover coated with the thin films are completely dried, and closing the other sheath cover after the powder is compacted; integrally packaging the upper sheath cover and the lower sheath cover filled with the powder by a vacuum bag, drawing out air from the vacuum bag and sealing the vacuum bag; and stripping the upper sheath cover and the lower sheath cover after forming by cold isostatic pressing. The sheath prepared by the method is low in cost, a current frequently-used rubber and plastic sheath needs to be formed by a metal mould, the sheath is prepared by the aid of the paperboards without a special mould, investment cost is reduced, generating period is shortened, and the sheath is easy to control and has a high promotional value.

Description

technical field [0001] The invention relates to a preparation method of a sheath used for forming metal, ceramics and cermet alloy materials in a cold isostatic pressing machine, in particular to a preparation method of a sheath used for cold isostatic pressing. Background technique [0002] Cold isostatic pressing is one of the most important forming methods in powder metallurgy. The sheathing material selected during forming has a direct impact on the finished product rate and product quality of the compact. At present, cold isostatic pressing in the field of powder metallurgy mostly uses two kinds of material sheaths: one is a rubber sheath, and the other is a latex sheath. The wrappers of these two materials are designed for specific products, and are only used for forming and processing of powder raw materials. Compacts of different shapes require corresponding wrappers to be pressed. For materials (such as molded blanks) that have a certain shape and need to further i...

AI Technical Summary

Problems solved by technology

The degree of tightness of iron wire binding, the number of threaded fasteners, and the position of the fasteners are all key factors affecting the yield of compacted compacts. The operation is complicated, which affects the production efficiency, and due to the poor sealing performance of vacuum sealing, it is easy to produce pressure during the pressing process. Billet into the oil phenomenon

In the current introduction and use of sheaths, they are all made of rubber or synthetic plastics. The production of rubber and plastic sheaths is inseparable from metal molds for forming. However, the manufacturing cost of metal molds is high and the processing cycle is long. It is not easy to adjust or repair the defects, and the hardness of the sheath is also difficult to control. During cold isostatic pressing, it is easy to produce dead angles, resulting in a high scrap rate of products

Images