Method for preparing metal structural part with complex shape through 3D cold printing

Abstract

The invention discloses a method for preparing a metal structural part with the complex shape through 3D cold printing, and belongs to the technical field of cold isostatic pressing forming. The method comprises the following steps that a 3D cold printing method is adopted to print a cold isostatic sheath green body of a glucose high polymer with a complex shape, and then a layer of colloid thin layer coats the surface of the green body so as to obtain a novel cold isostatic pressing sheath; metal powder is mixed with an organic liquid, a slurry is prepared and is poured into the novel sheathuntil the powder body completely fills the sheath, then cold isostatic pressing and vacuum sintering are carried out, so that the metal structural part with the complex shape is prepared. According tothe method, in the cold isostatic pressing process, the organic liquid in the slurry is absorbed through the porous loose sheath, so that the metal powder fully and uniformly fills the sheath, the resilience is small in the cold isostatic pressing process, stress concentration is avoided, the shape of a pressed green body of the structural part with the complex shape can be guaranteed to be complete, the pressed green body is free of breakage, and the method is high in yield and beneficial to obtaining the metal structural part with the complex shape and integrity and high-strength.

Description

technical field

[0001] The invention belongs to the field of cold isostatic pressing, and provides a method for preparing complex-shaped metal structural parts by 3D cold printing. Background technique

[0002] Cold isostatic pressing (Cold Isostatic Pressing, CIP) is an important powder metallurgy forming technology. It is a method of compressing and forming powder by transmitting isotropic pressure through a fluid medium at room temperature. It can process high-temperature alloy materials, hard alloy materials, and ceramic materials that are difficult to manufacture under conventional solidification conditions. Compared with conventional forming technology, cold isostatic pressing has the advantages of uniform product structure, no component segregation, high material utilization rate, high green density and low cost. Through CIP, the density of the workpiece can be greatly improved and the strength of the workpiece can be increased. Cold isostatic pressing is generally ...

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