Method for optimizing metal parts of SLM formed overhanging structure

Abstract

The invention discloses a method for optimizing metal parts of a SLM formed overhanging structure. The method comprises the following steps of 1, optimization of a spatial position; 2, optimization ofa support structure; and 3, optimization of local energy. According to the method, by optimizing the placing positions of the metal parts, the number of the overhanging structures can be reduced, theforming angle of key parts of the overhanging structure is increased so as to improve the forming quality, and the adding amount of supports can be effectively reduced; then the support structure isoptimized, the multiple cross supports with hollow thin walls provided with saw teeth are adopted to form a net-shaped structure, the supporting strength requirement is met, meanwhile, the powder using amount and the forming time required by supporting forming can be reduced, and the machining efficiency is improved; and then when the overhanging structure is formed, the scanning speed is improvedproperly or the laser frequency is reduced according to the size of the inclination angle of the overhanging structure so as to reduce input of local energy, lower the warping deformation trend and reduce slag hanging amount, and finally, a metal part overhanging structure meeting the requirements of high forming precision, small deformation and low surface roughness is obtained.

Description

technical field [0001] The invention relates to the field of selective laser melting rapid prototyping manufacturing, in particular to a method for optimizing metal parts of SLM forming overhang structures. Background technique [0002] 3d printing, also known as rapid prototyping (RP), additive manufacturing (AM), rapid manufacturing, etc., is a brand-new digital forming manufacturing integrating machinery, computer, numerical control and material science developed in the middle and late 1980s. technology. It changes the traditional manufacturing process-oriented component design into a performance-oriented brand-new design. It was once considered by the British "Economist" magazine that 3D printing technology is one of the important symbols of the third industrial revolution. [0003] Due to its unique characteristics such as high hardness and high temperature resistance, metal materials will have a huge development space as raw materials for selective laser melting (SLM)...

AI Technical Summary

Problems solved by technology

Since the inclination angle of c-d is smaller than that of a-b, it is easy to cause poor molding quality or molding failure in c-d

In selective laser melting, there is generally a limit inclination angle. When it is greater than this limit inclination angle, better molding quality can be obtained, but when it is less than this limit inclination angle, it is easy to cause such as image 3 Defects such as warpage and dross shown

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