基于SLS技术的精铸蜡粉成型件尺寸精度研究.pdfVIP

学兔兔 Jan．2015 Vo1．64 NO．1 · 9 · 基于SLS技术的精铸蜡粉成型件尺寸精度研究 姜乐涛 一，白培康 ，赵 娜 ，刘宇琨 f1．中北大学材料科学与工程学院，山西太原030051；2．石家庄经济学院华信学院，河北石家庄050700) 摘要：分析了选择性激光烧结成型精度的影响因素。采用正交试验方法，对精铸蜡粉进行了烧结成型试验，对影响 烧结件尺寸精度的四个主要因素进行了分析，并得到最佳工艺参数及在此工艺下的修正系数。结果表明：随着激光 功率的提高，试件收缩率呈加大趋势；随着扫描速度、预热温度和铺粉厚度增加，试件收缩率呈降低趋势。最佳工 艺参数为：激光功率l2 w、预热温度45℃、扫描速度1 500 mm／s、铺粉层厚0．2 mm，此工艺下水平方向修正系数为 1．000 2，竖直方向修正系数为1．002。 关键词：选择性激光烧结；精铸蜡粉；成型工艺；收缩率 中图分类号：TG249．5 文献标识码：A 文章编号：1001—4977(2015)O1—0009—04 Study on Dimensional Accuracy of Sintered Part of Investment Casting Wax Powder Based on SLS Technology JIANG Le—tao ’。，BAI Pei-kang ，ZHAO Na2，LIU Yu—kun (1．Materials Science and Engineering School，North University ofChina，Taiyuan 030051，Shanxi，China； 2．Huaxin College，Shijiazhuang University ofEconomics，Shijiazhuang 050700，Hebei，China) Abstract：The influence factors of forming precision were analyzed．The selective laser sintering experiments of investment casting wax powder was studied by using the method of orthogona1 test．The four important influence factors of dimensional accuracy were analyzed．The optimum process parameters and correction factor were obtained．The results show that the shrinkage ratio increased when the laser power improved yet the shrinkage ratio decreased when the laser scanning speed and the preheating temperature and the powder layer thickness improved．The optimum process parameters showed that the laser power was l 8 W．the preheating temperature was 45℃．the laser scanning speed was 1 500 mm／s．the powder 1ayer thickness was 0．2 mm and the correction factor on horizontal was 1．000 2．the correction factor on vertical was 1．002． Key words：selective laser sintering；investment ca