中文摘要：

为了探讨激光选区熔化成型典型几何特征的尺寸精度,并为激光选区熔化直接成型金属零件提供设计参考依据,设计了薄板、尖角、圆柱体、圆孔、方孔等典型几何特征的三维模型,采用华南理工大学研发的激光选区熔化设备（Di Metal-100）在优化的工艺参数下选用316L不锈钢粉末对这些典型几何特征进行激光选区熔化成型。实验结果表明,激光光斑约束、台阶效应、粉末粘附、激光深穿透等因素是影响零件尺寸精度和激光选区熔化成型能力的主要原因。基于对激光选区熔化成型典型几何特征的尺寸精度及成型能力研究,提出了一些适用于激光选区熔化的零件设计规则,为产品的创新设计提供了参考依据。

英文摘要：

In order to investigate dimensional accuracy of geometric features manufactured by selective laser melting（SLM） and to provide design references for SLM to manufacture metal parts directly, several typical geometric features such as thin walls, sharp corners, cylinders, circular holes, square holes, etc are designed.Then SLM equipment Di Metal-100 is employed and 316 L stainless steel powders are used to manufacture these typical geometric features under the condition of optimized process parameters. It is shown that laser spot restraint, step effect, powder adhesion and laser deep penetration are the main factors which affect dimensional accuracy of parts and affect manufacturing ability of SLM. The manufacturing ability of SLM and the dimensional accuracy of typical geometric features by SLM is studied. It puts forward some preliminary design rules suitable for SLM, which provides a reference for innovative design of products.