摘要
针对选择性激光烧结(SLS)工作缸内温度场不均匀和测温不准确的问题.根据HRP-Ⅳ型快速成形机建立了管式加热辐射系统数学模型,模拟加热管安装位置,计算工作区内各点角系数,并引入均匀度系数和最大偏差率两个指标来评价温度场均匀性和测温精度,同时对模拟状态进行实验分析.结果表明合理选择加热管安装位置和测温点可有效提高温度场均匀性和温度测量精度,最终实现SLS精确控温.在本研究条件下,温控误差在2℃以内,零件成形精度误差小于0.2 mm,且无翘曲变形.
It is common the problems that the cylinder temperature field is uneven and the temperature measurement inaccurate in SLS （selective laser sintering）. Based on HRP-IV rapid prototyping machine, a mathematical model of tube radiation heating system was established to simulate heating installation location and to calculate angle coefficient of all work areas. Uniformity coefficient and the largest deviation were introduced to evaluate the accuracy and uniformity of temperature. The state was simulated experimentally. The results show the uniformity and measurement accuracy of the temperature can be improved effectively through reasonable choice heating installation location and temperature measurement to achieve accurate temperature control of SLS. Under the conditions of this study, the temperature control error is less than 2℃ and the parts forming accuracy error is less than 0.2 mm without warpages.
出处
《华中科技大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2008年第5期93-96,共4页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
基金
湖北省创新群体基金资助项目(2004ABC001)
关键词
材料成形
选择性激光烧结
温度场
角系数
均匀性
最大偏差率
material processing
selective laser sintering
temperature field
angle coefficient
uniformity
largest deviation
