选区激光熔化快速成型扫描路径优化算法研究

Optimized Scanning Path Algorithm Based on Selective Laser Melting Rapid Prototyping Technology

本文针对选区激光熔化成型过程中所存在的翘曲变形、球化等现象及其成因进行了简要分析,并且结合相关文献,提出了重复扫描和分区扫描相结合的路径生成算法。分区避免了长线扫描,因而可以有效减小翘曲变形,一个层面上重复扫描可以减小层间的内应力,并且可以提高熔化层的表面质量,因而此种扫描路径生成算法可以有效地改善零件的成型质量。

A metal body with metallurgical joint and 100% density has been made by the Selective Laser Melting(SLM),with a procedure of selective melting layer-by-layer for metal or alloy powder,by using a focused laser beam.The paper focused on the phenomenon of warp distortion and balling,simple analyzed the reasons for each other and then proposed a new scanning path generating algorithm,which is repeat scanning combined with subfield scanning.The main idea of this algorithm is to first subfield scanning in X-Direction and then subfield scanning in Y-Direction.Subfield scanning can avoid the long line scanning,so it can reduce the warp distortion effectively.Repeat scanning on one layer not only can reduce the interior stress,but also can enhance the surface quality of the melting layer.So this scanning path generating algorithm can improve the confectioning quality of the accessories effectively.