【摘要】 扫描方式是激光金属沉积成形(Laser metal deposition shaping,LMDS)制造过程中的关键技术,在分析现有扫描方式及其对成形质量和成形效率影响的基础上,指出现有扫描方式的缺陷,并提出一种基于层面轮廓优化单调区分解的分区平行扫描方式。该方式基于极值顶点可见性原理,对分层后的断面轮廓进行去除内环、非单调多边形的单调剖分等处理,可最大限度地减少分区数量,获得若干个单调子区域。针对各单调子区域采用适应性变间距平行路径填充,可减小扫描线的长度,并保证均匀致密性填充。试验表明这种扫描方式能够提高成形效率和成形质量。更多还原

【Abstract】 The scanning mode is a key technology in the laser metal deposition shaping (LMDS) fabrication process. On the basis of analysis of the existing scanning mode and its influence on the fabrication efficiency and quality of the parts, some disadvantages of the existing scanning mode are pointed out. A kind of subarea-parallel scanning mode for LMDS basic on subdividing profiled outline into monotonous polygon subareas is presented. On the basis of the principle of extreme point visibility, inner loops are eliminated, and simple polygons are subdivided into monotonous polygons with the minimal zones. Parallel scanning paths with adaptive scan space of all monotonous polygon subareas are finished, which diminishes the length of scanning line, and ensures uniform and compact filling scan. Practical application shows that the scanning mode can enhance the fabrication efficiency and quality.更多还原