Method for quick additive manufacturing of large-scale bimetal spare parts

Abstract

The invention provides a method for quick additive manufacturing of large-scale bimetal spare parts. The technological process of the method mainly comprises the following steps of respectively usinga selecting region laser melting shaping technique and a plasma arc additive manufacturing technique to print an outermost layer and an internal structure of a spare part: after the outermost layer structure in a current circulation is printed through the selecting region laser melting shaping, sucking metal powder in the outline of the outermost layer with an internal powder sucking machine, thenprinting and stuffing the internal structure through plasma arc additive manufacturing, and continuing circulating until printing of the spare part is completed. The method disclosed by the inventionhas the beneficial effects of having the capacity of quickly printing large-scale complex-shape spare parts, having the capacity of quickly printing large-scale spare parts which are high in surfaceaccuracy requirements, and having the capacity of printing multi-material spare parts of which the outermost layer materials and the internal materials are different.

Description

Technical field [0001] The invention relates to a method for preparing a new type of metal parts, in particular to a rapid additive manufacturing method for large parts that combines a plasma arc additive process and a selective laser melting forming process, and belongs to the field of metal materials. Background technique [0002] Selective laser melting molding technology is a high-precision metal additive manufacturing method. The printed samples have a smooth surface and fine structure, but the printing speed is very slow, and it is difficult to print large parts efficiently, and it is difficult to print parts composed of multiple materials. [0003] Plasma arc additive manufacturing technology is an efficient metal additive manufacturing method, but the printing accuracy is lower than that of selective laser melting forming technology. It is suitable for printing finished or blank parts with larger size but lower accuracy requirements. [0004] Chinese patent CN201611115889.3 p...

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Problems solved by technology

[0004] Chinese patent CN201611115889.3 proposes a method of powder metallurgy forming functionally graded materials based on selective laser melting, but this method does not introduce technology that can increase the printing speed, so the printing speed is relatively slow

[0007] Chinese patents CN201720730439.9, CN201610458932.X, CN201610458934.9 and Chinese patent applications CN201610994357.5 and CN201811279445.2 all propose wire feeding additive manufacturing methods based on plasma arc heat sources, but these methods are all for direct printing to obtain high precision Geometry proposes effective measures, so it is not suitable for printing parts with high precision requirements

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