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采用粘塑性理论建立烧结过程的本构模型,以316L不锈钢粉末注射成形产品为例,设计出烧结过程中重力作用下弯曲梁试验和膨胀计中的自由烧结试验,分别用于标定本构模型中的粘度模量和烧结应力。通过用户子程序,在有限元求解器Abaqus~(?)上实现数值模拟,预测产品在烧结过程中的收缩和变形。考虑了重力、摩擦以及注射阶段粉末与粘结剂的偏析效应对于烧结工艺的影响,数值模拟结果与试验结果一致。
The visco-plastic theory was used to establish the constitutive model of the sintering process. Taking the 316L stainless steel powder injection molding product as an example, the free-sintering test in the bending beam test and dilatometer in the sintering process was designed and used to calibrate the constitutive model The viscosity modulus and sintering stress. Through the user subroutine, numerical simulation is carried out on Abaqus ~ (?) Finite element solver to predict the shrinkage and deformation of the product during sintering. The influence of gravity, friction and the segregation effect of powder and binder on the sintering process were considered. The numerical simulation results are consistent with the experimental results.