Modeling of Selective Laser Sintering for PC Powder
-
摘要: 建立选择性激光烧结粉末快速成形工艺过程的数值计算模型,并用于估算烧结深度.在该计算模型中,综合考虑了材料的热物性参数随温度变化的情况和激光光强分布不均匀的因素.采用有限差分方法求解烧结过程中的瞬态传热微分方程,对烧结深度进行模拟计算,结果与实验值吻合较好.Abstract: Numerical computation model for the thermal process of selective laser sintering of powders were presented to predict the sintered depth in selective laser sintering．The factors of the material thermal physical properties varing with the temperature and the un-uniformed distribution of laser intensity across the beam diameter had been taken into account in the computation model．The problem was formulated by a three-dimensional transient heat transmission model and solved by the finite differential method．The results show that the predicted sintered depth accord with the measured value and the model can be used to estimate the sintered depth in selective laser sintering．
-
Key words:
- laser heating /
- polycarbonates /
- difference methods /
- selective laser sintering /
- rapid prototyping
-
[1] 李晓明. 微粉与新型耐火材料[M]. 北京:冶金工业出版社,1997. 1~5. [2]Childs T H C,Berzins M,Ryder G R,et al. Selective laser sintering of an amorphous polymer ——simulation and experiments[J]. Proc Instn Mech Engrs,1999,213B:333~349. [3]Sun M M,Beaman J J. A three dimensional model for selective laser sintering. In Solid Freeform Fabrication Symposium. US:University of Texas,1991. 102~109. [4]Gaur U,Lau S F,Wunderlich B. Heat capacity and other thermodynamic properties of the linear macromolecules[J]. J Phys Chem Ref Data,1983,12:93. [5]Nelson J C,Xue S,Barlow J W,et al. Model of the selective laser sintering of bisphenol-A polycarbonate[J]. Ind Eng Chem Res,1993,32:2305~2317. [6]Yagi S,Kuni D. Studies on effective thermal conductivities in packed beds[J]. A I Ch E J,1957,3:83~95. [7]Nelson J C. Selective sintering:a definition of the process and an empirical sintering model. The University of Texas at Austin,1993. [8]赵保军,施法中,冯 涛,等. 选择性激光烧结粉末快速成型技术中的三维温度场分析[J]. 中国机械工程,2000,11(增刊):93~95. [9]Ozisik M N著.热传导[M]. 俞昌铭主译. 北京:高等教育出版社,1984. 506~540. [10] 俞昌铭 编著. 热传导及其数值分析[M]. 北京:清华大学出版社,1982. 392~454. -
点击查看大图
计量
- 文章访问数: 3454
- HTML全文浏览量: 221
- PDF下载量: 962
- 被引次数: 0
下载:
