摘要
选择性激光烧结(Selective laser sintering,SLS)系统是通过加支撑或采用人工调节预热温度的方法来减少成形件的翘曲变形,它劳动强度大、SLS材料浪费多、成形效率低,且预热温度难以精确控制。基于以上情况,提出一种新的控制方法,使预热温度能随零件断面几何形状的变化而自动调节。以华中科技大学开发的SLS设备为研究对象,验证这种新型控制方法的可行性。试验结果和实际应用表明:与原有控制方式比较,根据文中所提出的方法成形的零件表面质量、尺寸精度和形状精度等都有较大幅度改善,并且真正实现了SLS成形过程的自动化。
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.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2006年第6期67-72,共6页
Journal of Mechanical Engineering
基金
国家863计划(863-511-920-010)
湖北省自然科学基金创新群体(2004ABC001)资助项目。
关键词
预热温度
切片
特殊断面
模糊控制
Preheating temperature SliceSpecial section Fuzzy control
