多零件选区激光熔化成型效率的优化  

Efficiency optimization of selective laser melting for multi-parts

作　　者：刘杰[1] 杨永强[1] 苏旭彬[1] 肖冬明[1] 

机构地区：[1]华南理工大学机械工程学院,广东广州510640

出　　处：《光学精密工程》2012年第4期699-705,共7页Optics and Precision Engineering

基　　金：2010年广东省教育部产学研结合重点项目(No.2010A090200072);华南理工大学优秀博士学位论文创新基金资助项目

摘　　要：对多零件选区激光熔化的成型效率进行了优化。首先,分析了多零件选区激光熔化成型过程的时间消耗,并以减少时间消耗为目标建立了3维零件在3维成型空间中的2.5维排料优化规则。然后,研究了2.5维自动排料,提出利用3维零件模型在2维平面区域的投影将2.5维排料转化为2维排料的简化方法和一种利用切片数据进行投影生成的算法。最后,为验证所述方法的有效性,以手术模板模型为例,在虚拟选区激光熔化系统VDemetal280上进行了优化实验。与优化前相比,优化后的成型次数从4次降为3次,在扫描速度为600mm/s、切片层厚为0.035mm、扫描间距为0.08mm的工艺参数下,总铺粉次数从3 892次降为2 231次,预计加工时间从约91 276s降为69 918s,时间消耗有明显减少。An optimized method was proposed to improve the processing efficiency of Selective Laser Melting（SLM） for multi-parts.First,the time consuming of the SLM process was analyzed and the 2.5D nesting rules for the optimization were established to reduce the time consuming.Then,the 2.5D automatic nesting was studied.A simplified method which uses the 3D projection to convert the 2.5D nesting to the 2D nesting and an algorithm for generating the projection from slice data were presented.Finally,by taking a operation model for an example,an experiment was performed on the virtual SLM system developed with OpenGL and VC＋＋ to simulate the motion of real system and to validate the feasibility of the method.The result shows that the processing times are reduced from 4 to 3,the recoating times are from 3 892 to 2 231 and the expected processing time has been from 91 276 s to 69 918 s at a scanning speed of 600 mm/s,slicing thickness of 0.035 mm and track space of 0.08 mm.The time consuming has been significantly reduced as compared with that before optimization.

关 键 词：激光技术 选区激光熔化 多零件 成型效率 2.5维排料 

分 类 号：TG665[金属学及工艺—金属切削加工及机床]