新的激光快速成形方法及应用

针对目前主要激光快速成形方法的优缺点,提出一种基于三维实体边界分割的激光快速成形新方法.该方法将叠层实体制造(LOM)法主要进行激光二维轮廓线扫描和选择性激光烧结(SLS)法能够加工多种覆膜粉末材料的优点有机结合,能够克服SLS法加工效率低,成形件致密度、硬度、精度和表面粗糙度等性能较低的缺点.利用自主开发的快速成形系统,采用热像仪测温与Ansys模拟激光能量输入模型相结合的方法对工艺参数进行确定,对基于三维实体边界分割激光快速成形方法进行应用研究,实现三维实体的快速成形及金属零件的快速铸造,并通过无模具快速铸造的手段获得金属齿轮铸件.

NEW LASER RAPID PROTOTYPING METHOD AND ITS APPLICATIONS

To against the demerits of currently main RP technology, a novel method of laser rapid prototyping is presented, which is based on solid boundary surface separating. This method naturally combines the advantages of both. LOM which builds a part by 2D contour scanning and SLS which can process multi-kind of powdery materials. Furthermore, it can overcome some of the limitations of SLS such as low efficiency, low density and hardness, bad precision and surface smoothness, etc. Using the self-developed RP system, optimal processing parameters are obtained by a method that combines the results of temperature measured by the infrared thermal imaging system and laser energy distributed model simulated with ANSYS. The apply investigation is carried on and three dimensions rapidly manufacturing of foundry mold and quick casting of metal part are achieved by this novel method, and a metal bevel gear is successfully produced by pattern-less quick casting.