增材制造成型室温度场的优化研究

Research on the Optimization of Temperature Field in Modeling Room on Additive Manufacturing

针对熔融沉积成型(Fused deposition modeling,FDM)3D打印在成型室打印过程中存在由温度场导致的成型件翘曲和层间分离等问题,本文整合温度场、材料热物性和成型件潜热等条件,建立打印成型件的三维瞬态仿真模型。以生死单元技术和材料参数为基础进行ANSYS有限元分析,使用APDL参数化语言对成型件打印过程进行瞬态分析和热应力验证,对成型件进行局部分析和整体分析,仿真结果得到了实验结果的证明。加热底板与成型室环境的温度会影响成型件的温度梯度和热应力,导致翘曲、层间分离等问题。成型室使用研究结果的温度场参数可以减少成型件翘曲、断裂和形变等问题从而提升熔融沉积成型3D打印的成型件质量。

During the printing process in the modeling room,the Fused Deposition Modeling(FDM)3D printing has many problems such as warping and layer separation due to temperature fields.Aiming at these problems,a three-dimensional transient simulation model for printing modeling parts is established in this thesis by integrating the temperature field,material thermal properties,and the latent heat of modeling parts.Specifically,ANSYS finite element analysis is carried out on the basis of the birth and death element technology and material parameters;the transient analysis and thermal stress verification is conducted during the printing process of the modeling part by applying the APDL parametric language;the local analysis and the overall analysis are conducted on the modeling part.Subsequently,the simulation results are verified by the experimental results.The temperature of the heating bottom plate and the modeling room’s environment will influence the temperature gradient and the thermal stress of the modeling part,which will lead to many problems,such as warpage,interlayer separation,etc.moreover,the application of the temperature field’s parameters from the research results in the modeling room can reduce problems(such as the modeling part’s warpage,fracture,and deformation)so as to improve the modeling part’s quality in FDM 3D printing.