Method for combining casting and selective laser melting formation to manufacture large-sized metal part

Abstract

The invention discloses a method for combining casting and selective laser melting formation to manufacture a large-sized metal part. The method comprises the specific steps that the regular portion of a cast part structure is used as a matrix of selective laser melting, the matrix is installed on a platform of a selective laser melting device, and the matrix is guaranteed to be horizontal; by manually controlling a powder laying scraper of the selective laser melting device to horizontally lay metal powder used for forming a complicated part on the matrix on the cast matrix, powder is repeatedly laid until the powder completely fills in concave portions of the cast matrix, and after filling is completed, the powder on the surface of the matrix is thinned to a layer thickness; Ar gas is fed into a formation bin, independent sintering is manually conducted on the first layer of outline, and an automatic formation system is started to conduct part layered formation until the whole part is formed. By the adoption of the method, the regular part of the part structure is manufactured through a casting method, the complicated precise structure is formed on the cast matrix through the selective laser smelting technology, so that cost is saved, and efficiency is high.

Description

technical field [0001] The invention belongs to the technical field of additive manufacturing, and relates to a method for manufacturing large metal parts by combining casting and selective laser melting forming. Background technique [0002] Casting technology is a traditional manufacturing technology. This technology is used to manufacture regular components with low cost and high efficiency. However, it is difficult and costly to manufacture components with complex structures, and the manufacturing cycle is long. [0003] Laser selective melting forming technology is a high-performance rapid manufacturing method for metal materials. This technology (also known as Selective Laser Melting, SLM) is based on the basic idea of ​​rapid prototyping, that is, point-by-point, layer-by-layer cladding additive manufacturing. According to the three-dimensional model of the part, the model is layered and sliced ​​at a certain thickness, and the three-dimensional shape information of t...

AI Technical Summary

Problems solved by technology

During the forming process, the metal powder is completely melted, and the melted powder parts produce good metallurgical bonding, which can form high-precision complex special-shaped metal parts, and has the characteristics of high metallurgical bonding structure and performance, but the manufacturing cost of this process is high, and it is difficult to print. parts made of different materials

[0004] At present, the demand for high-efficiency, low-cost, and high-performance metal component manufacturing technology in aerospace and other fields is becoming more and more urgent. It is difficult for a single manufacturing technology to meet the demand in terms of manufacturing cost and manufacturing cycle.

Images