FDM连续挤压成型过程中温度场的有限元分析

FINITE ELEMENT ANALYSIS OF TEMPERATURE FIELD INFDM CONTINUOUS EXTRUSION PROCESS

在熔融沉积成型中,针对动态重新划分网格法描述金属流动变形存在计算复杂且工作量大的问题,提出一种连续挤压成型过程中温度场的有限元分析法。通过采用逐次单元法对熔丝在挤压槽内的应力进行分析,得出铝丝与轮槽各接触面上的热流密度,建立温度场有限元分析的数学模型。采用热流密度等效法对金属流动变形进行数值分析,减少计算时间,提高CPU效率。利用有限元分析软件对挤出喷头中的温度场进行热力耦合模拟仿真,获得在不同转速下挤压槽内温度场分布等值线图。仿真结果表明,熔丝在挤压成型过程中,温度场分布均匀,总体状态稳定,保证了成型质量,改进后程序运算时间减少30.9%,CPU运行效率优化17.3%。

Aimed at the problem of complex calculation and heavy workload in describing metal flow deformation by dynamic remeshing method in fused deposition modeling(FDM),a finite element analysis method for temperature field in FDM continuous extrusion process is proposed.By using the successive element method to analyze the stress of the fuse in the extrusion groove,the heat flux on each contact surface of the aluminum wire and the groove was determined,and the mathematical model of the finite element analysis of the temperature field was established.The heat flux equivalent method was used to analyze the metal flow deformation,which could reduce the calculation time and improve the CPU utilization.The temperature field in the extrusion nozzle was simulated by using the finite element analysis software,and the contour map of the temperature field in the extrusion groove at different speeds was obtained.The simulation results show that the temperature field is evenly distributed and the overall state is stable during the extrusion forming process,which ensures the forming quality.After the improvement,the program running time is reduced by 30.9%,and the CPU utilization is optimized by 17.3%.