Numerical Simulation of Selective Laser Sintering Transient Temperature Field
In the processing of Selective Laser Sintering (SLS), the transient sintering temperature field has effect on directly pro-typing mechanism and sinter quality. So the choice of the sintering parameter reasonably is based on the sintering temperature field distribution rule of different materials. But the transient sintering temperature not only changes quickly but also is subject to many factors, especially such as thermal conductivity of materials, the sintering parameters. In this paper, a novel numerical simulation pattern is proposed. The pattern is based on the transient heat exchange theory, the boundary conditions is concerned soundly, particularly during the transient sintering, the relation between thermal conductivity and transient sintering temperature is set up to simulate the practical sinter process. According to finite element algorithm, if only changing the sintering parameters and different materials thermal conduction, the transient temperature field of SLS could be get by the new corresponding program. As a typical and comprehensive sample, polystyrene SLS transient temperature field is analyzed. In the course of sintering the cube with 72mm×7mm×5mm to different parameters, both in a time the scanning line temperature and in a point the temperature variation with time could realize. At the same time, the simulation result accords well with the practical measurement result using the contacted thermocouple with powder bed. The results show the simulative transient sintering temperature is 252 and that of ℃ practical measurement is 241 with laser scanning ℃ speed 2000mm/s and laser output power 15W. the simulative transient sintering temperature is 313 ℃ and that of practical measurement is 299 with laser ℃ scanning speed 1750mm/s and laser output power 40W. With the simulation system of SLS transient temperature field developed in this paper, the SLS transient temperature field could be obtained rapidly and precisely with different materials and parameters, basis of selecting sintering parameters soundly and next analyzing of stresses and defects is made firmly.
selective laser sintering transient temperature field numerical simulation finite element
XING Jian SUN Jinghua
School of Science, Harbin engineering university of China, Harbin, 150001
国际会议
北京
英文
2007-08-05（万方平台首次上网日期，不代表论文的发表时间）