选区激光烧结的不均匀温度场对成形过程的影响分析

摘要

Stress and deformation resulting from an unbalanced thermal field have a significant effect on quality and precision in selective laser sintering.In this paper,the finite element method is applied to simulate thermal fields in different scan patterns and tempera-ture of pre heating and keeping warm.Meanwhile, experiments are performed to analyze and calculate stress and deformation.According to simulations and experiments,pre heating and keeping warm can de-crease the thermal stress effectively and scanning in the x direction and the y direction alternately can mini-mize the stress and deformation.%选区激光烧结过程中，不均匀温度场引起的应力和变形是制约成型质量，影响成型精度的重要因素。通过有限元仿真，分析了不同扫描方式和预热保温温度情况下激光烧结的温度场，同时结合实验对不同扫描方式和预热保温温度下的应力和变形做出分析和计算。仿真和实验表明，预热保温能够有效减小烧结物的热应力，同时采用长短线交叉的扫描方式得到的烧结物应力和变形最小。