The Method of Removing Cracks on the Inner Cavity Surface of Selective Laser Melting Formed Parts

Abstract

The invention relates to a method for removing surface cracks in the inner cavity of selected laser melting and forming parts, which comprises: a hot isostatic pressing treatment step: performing hot isostatic pressing treatment on the selected laser melting and forming parts; an abrasive flow treatment step: heat treatment, etc. After the hydrostatic pressure treatment, the selected laser melting and forming parts are subjected to abrasive flow treatment. The method of the present invention for removing surface cracks in the inner cavity of the selected laser melting and forming parts is by setting the abrasive grain flow step after the hot isostatic pressing step, the original surface quality of the selective laser melting and forming parts is better, and the abrasive grain flow process is adopted to eliminate the opening of the inner cavity of the parts Cracks can effectively improve the comprehensive performance of the parts.

Description

technical field [0001] The invention relates to the technical field of material processing, in particular to a method for removing cracks on the inner cavity surface of a part formed by selective laser melting. Background technique [0002] Selective Laser Melting (SLM) technology is a typical additive manufacturing (Additive Manufacturing) technology, which is predicted to be one of the key technologies that may trigger the "third industrial revolution". Its main technical principles are as follows: The three-dimensional digital model of the part to be processed is divided layer by layer, and input into the selected area laser melting forming equipment. First, fix the substrate on the forming platform and level it, then use a scraper or a powder roller to spread powder in a single layer, and use one or more laser beams to melt the laid single-layer powder in selected areas, realizing the point-to-point Line, forming process from line to surface, and then the forming platfo...

AI Technical Summary

Problems solved by technology

However, due to the inherent characteristics of the hot isostatic pressing process, it can only close the internal cracks of the part and eliminate the internal cracks, but has no effect on the surface opening cracks.

However, the mechanical processing method has problems such as high limitation of processing position and complicated process for parts with complex structures, especially the parts formed by selective laser melting usually have complex inner cavity structures, and the mechanical processing technology is often difficult to play a role

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