一种新的用于选区激光熔化快速成型扫描路径的生成算法

在激光逐层熔化金属粉末的过程中，扫描器要做频繁的扫描运动，因此选择合理的激光扫描路径一直是此技术研究的重点问题。提出了一种称为“消隐”的扫描路径生成算法。首先依次生成每个轮廓的轮廓扫描线，由于轮廓形状可能为凸多边形也可能为凹多边形，所以在生成各轮廓的扫描线时要增加一些特殊处理操作。为了减少重复计算的次数，将截面的所有轮廓划分为一系列的单连通区域，将处理后的各轮廓的扫描线，以单连通区域为单位应用消隐法生成层扫描线。之后按照就近原则对各单连通区域内部扫描线的输出次序进行优化，即可得到分块的最终扫描线，可以直接用于加工。测试表明，此算法通用性强，生成扫描线的速度较快。

A New Scanning Path Generating Algorithm Used for Selective Laser Melting Rapid Prototyping System

In the process of selective laser melting of metal powder layer-by-layer, frequent scanning is carried out by the scanning system，so reasonable selection of the laser scanning path is the main problem of this technique. A scanning path generating algorithm, called “blanking” was proposed in this paper. The implementation process of the algorithm is as follows: First, the scanning lines of each contour are generated, while the contour's shape can be divided into convex polygon and concave polygon, and the generating process of the scanning lines of each contour needs special treatments . In order to decrease the number of repeat calculation, the contours can be divided into a series of simply connected region. Blanking method will be used for the contour's scanning lines to generate scanning lines of the layer by the unit of simply connected region. Afterwards, the output order of the scanning lines in the simply connected region will be optimized by the rule of adjacent, and then the blocked final scanning lines can be obtained. These final scanning lines can be used for rapid prototyping process. Test result indicates that the algorithm has a high versatility, rapid generation of the scanning lines.