Shi Yusheng  Zhong Jianwei  Cai Daosheng  Huang Shuhuai

(State Key Laboratory of Plastic Forming Simulation and Die & Mould Technology,Huazhong University of Science and Technology, Wuhan 430074)

Abstract: In the current selective laser sintering(SLS) machines, the curl distortion of SLS part is reduced by adding support or manually adjusting preheating temperature, which results in the big working strength, waste of SLS material, low fabrication efficiency, and difficulty to exactly control preheating temperature. For this reason, a new control method based on part’s slicing is presented in this paper, which can automatically adjust the preheating temperature according to the different section shape of a part. This new control method is validated in the SLS machine developed by Huazhong University of Science and Technology. The results of experiment and application show that the surface quality, dimensional accuracy and shape accuracy of the part fabricated with this new control method are better than the ones of the part fabricated with the current control method, and this new control method puts the SLS process into automatization successfully.

Key words: Preheating temperature  Slice  Special section  Fuzzy control

CLC No: TP391 

国家863计划(863-511-920-010)和湖北省自然科学基金创新群体(2004ABC001)资助项目 . Received 20050809, received in revised form 20051118