A method for preparing cold isostatic pressing envelopes by 3D cold printing

Abstract

The invention provides a method for preparing a cold isostatic pressing cover sheath through 3D cold printing, and belongs to the technical field of cold isostatic pressing shaping. According to the method, 1 to 5 percent of glucose, 50 to 65 percent of starch powder, 0.5 to 2 percent of sodium chloride, 0.2 to 0.8 percent of ethylene diamine tetraacetic acid, 0.5 to 4 percent of swelling agents,0.1 to 1 percent of dispersants, 5 to 10 percent of formation agents, 2 to 7 percent of gelling agents, 1 to 5 percent of reinforcing agents and the balance of water are uniformly mixed according to the mass ratio and a certain sequence; the slurry with certain viscosity is obtained through stirring; then, 3D cold printing is performed; printing is performed to obtain the cold isostatic pressing cover sheath; the heating is performed for 20 to 60min in a steam pot at 80 to 130 DEG C; finally, a layer of thin rubber film covers the outside of the cover sheath; the novel cold isostatic pressingcover sheath is obtained through preparation. The cold isostatic pressing cover sheath through 3D cold printing prepared by the method has the advantages that the raw materials can be easily obtained;the price is low; the preparation process is simple; safety and no pollution are realized. The novel cold isostatic pressing cover sheath has small rebounding and no stress concentration, and can beused for preparing the cover sheath with the complicated shape; no shape limitation exists; in addition, the complete and no fracture of the product shape can be maintained; in addition, the pressed product density uniformity performance is good.

Description

technical field [0001] The invention belongs to the field of cold isostatic pressing and provides a method for preparing a novel cold isostatic pressing sheath by 3D cold printing. Background technique [0002] Cold isostatic pressing is to put powder into a sealed elastic mold, place it in a container containing liquid or gas, apply a certain pressure to it with liquid or gas, and press the powder into a solid body to obtain a certain shape. After release, the mold is taken out from the container, and subsequent sintering is carried out after demoulding. Compared with molding, cold isostatic pressing has the following advantages: slightly shaped blanks, such as four-shaped, hollow, etc., are different from block-shaped and cylindrical blanks; the density of the green compact is evenly distributed; the mold material is rubber and plastic, Low cost; high compaction strength, easy to process and transport. [0003] Cold isostatic pressing (Cold Isostatic Pressing, CIP) is an...

AI Technical Summary

Problems solved by technology

However, these sleeves are difficult to form parts with complex shapes. During the pressing process, because of the stress concentration and elastic rebound of these sleeves during the pressure relief process such as cold, it is easy to appear when forming complex shapes and multi-symmetric axis parts. Fracture, low yield rate, resulting in waste of raw materials and increased cost

At present, due to the limitation of the shape of the cold isostatic pressing jacket, the cold isostatic pressing technology is only limited to the preparation of blocks or hollow thick-walled blanks with regular and simple shapes, and it is impossible to prepare workpieces with irregular and complex shapes.

Therefore, it is of great significance to use a new type of cold isostatic pressing sleeve to solve the problems of difficult forming of complex shapes and low yield of pressed parts.

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