Metal-gradient-material laser-shock-forging composite additive manufacturing method and device

Abstract

The invention discloses a metal-gradient-material laser-shock-forging composite additive manufacturing method and device. The method includes: gradually spraying multi-metal mixed powder, which changes according a preset mixing proportion curve, according to a 3D printing filling scanning path, using a heat source to fuse the metal mixed powder to form the cladding layers of a workpiece, and using shock waves induced by pulse laser to impact and forge the cladding layers; stacking the cladding layers layer by layer, and forming the workpiece. The metal-gradient-material laser-shock-forging composite additive manufacturing method and device has the advantages that the cladding layer forming using the heat source to fuse the mixed metal powder and the cladding layer impacting and forging using the pulse laser are performed at the same time and are coordinated to manufacture a metal part, shaping and reinforcing are completed in one step in an efficient and high-quality manner, defects such as air pores, non-fusion and shrinkage cavities of the cladding layers are eliminated, and part internal quality is increased.

Description

technical field [0001] The invention relates to the technical field of 3D printing, in particular to a laser impact forging composite additive manufacturing method for metal gradient materials. The invention also relates to a metal gradient material laser shock forging composite additive manufacturing device. Background technique [0002] Different from traditional "removal" manufacturing, "additive manufacturing" does not require original embryos and molds. Based on computer graphics data, objects of any shape can be generated by adding materials. As the main realization form of "additive manufacturing", 3D printing technology is rapidly changing people's traditional production methods and lifestyles. 3D printing manufacturing technology characterized by digitization, networking, personalization and customization is expected to promote the third industry. revolution. Among the 3D printing technologies, the additive manufacturing of metal parts has the widest demand range ...

AI Technical Summary

Problems solved by technology

However, the promotion and application of the metal gradient material 3D printing technology is limited because the mechanical properties of the molded parts cannot fully meet the requirements of use. The main disadvantages are as follows: (1) There are excessive residual stress and local regional stress in the single metal 3D printing molded parts Concentration problem, post-processing and elimination method is difficult, resulting in brittle fracture

Due to the different thermal conductivity of different metals in 3D printing of metal gradient materials, the plastic deformation is not uniform due to the inconsistent cooling rate during the solidification process, which makes the stress problem more serious

(2) Insufficient mechanical properties due to internal defects: internal defects include pores, unfused

Pores and lack of fusion are fatal fatigue initiation sources for load-bearing structural parts, which in turn lead to hidden dangers in the reliability of 3D printing of metal gradient materials

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