Device and method for improving surface quality of selective laser melting (SLM) forming piece through integrated double-type laser light

Abstract

The invention discloses a device and a method for improving the surface quality of a selective laser melting (SLM) forming piece through an integrated double-type laser light. The device comprises anoptical fiber laser, an optical fiber laser beam expanding collimator, a femtosecond laser, a femtosecond laser beam expanding collimator, a scanning galvanometer, a lens and the like. During an SLM layered manufacturing process, a femtosecond laser technology is used for ablating and reconditioning spheroidization, bulges, powder adhesion and other defects probably occurred in each forming layerand a profile, so that the surface quality of each SLM forming layer is improved without producing an extra heat influence, the roughness of an upper surface and side surfaces of an SLM forming pieceare improved during an accumulation process, performance indexes such as the compactness and the size precision of the parts are improved, and the rejection rate of SLM processing is reduced.

Description

technical field [0001] The invention relates to the improvement and optimization measures of the molding quality of metal 3D printing moldings, and in particular to a device and method for integrating dual-type lasers to improve the surface quality of SLM moldings. Background technique [0002] Selective Laser Melting (SLM) technology is a metal additive manufacturing technology that can directly form dense structures and good mechanical properties, and can directly form high-precision metal parts with metallurgical integration and complex shapes. This technology has unique advantages in the manufacture of aerospace components, tool molds, jewelry and personalized medical bio-implants. Although SLM has many advantages compared with traditional manufacturing and processing, due to the difficulty of unifying the current SLM processing technology, the poor surface roughness of molded parts has become its biggest defect. In general, the arithmetic average deviation of the surfa...

AI Technical Summary

Problems solved by technology

[0003] At present, the methods for improving the surface roughness of SLM moldings mainly include the optimization of process parameters (laser power, scanning speed, scanning strategy, etc.) Detection and treatment of powder melting, that is, when defects such as spheroidization, bumps, and powder adhesion occur due to improper process parameters, the defects are not repaired in real time

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