摘要
利用Ansys有限元软件,建立了多组元金属粉末选区激光烧结过程中三维瞬态温度场计算模型。在考虑了相变潜热、辐射对流和随温度变化的热物性参数条件下,使用APDL参数化语言实现了高斯热源的施加和热源按一定速率的移动。通过该计算模型可掌握成形过程中烧结温度场随时间的变化规律,进而控制多组元金属粉末选区激光烧结成形机制,避免"球化"效应、翘曲变形等缺陷,为合理选取激光工艺参数提供理论依据。对Ni和Cu-10Sn多组元混合粉末进行了选区激光烧结实验,验证了模拟结果的正确性。
By using the Ansys software, a finite element method（FEM） model is developed to simulate the 3-D transient temperature fields during selective laser sintering （SLS） of multi-component metal powder. Considering latent heat of the phase change, radiation, convection, and temperature-dependent thermal properties, the application of Gaussian thermal resource and the movement of the laser beam are realized using APDL parametric design language. The temperature fields at different time during the sintering process are obtained, thus facilitating the control of laser sintering mechanisms of multi-component metal powder. The understanding of temperature fields provids a theoretical basis for the optimization of laser processing parameters, hence avoiding such defects as ＂bailing＂ effect and curling deformation. The laser sintering experiment on a multi-component powder mixture consisting of Ni and Cu-10Sn is carried out and simulation results are verified to be correct.
出处
《南京航空航天大学学报》
EI
CAS
CSCD
北大核心
2008年第5期611-616,共6页
Journal of Nanjing University of Aeronautics & Astronautics
基金
国家自然科学基金(50775113
10276017)资助项目
航空科学基金(04H52061)资助项目
南京航空航天大学科研创新基金(S04032061)资助项目
关键词
快速原型
选区激光烧结
数值模拟
有限元法
温度场
rapid prototyping（RP）
selective laser sintering （SLS）
numerical simulation
finite element method
temperature field
作者简介
沈以赴，男，博士，教授，博士生导师，1964年12月生，E—mail：yifushen@nuaa．edu．cn。
