基于材料边界的挤出温度场数值模拟  

Numerical Simulation of Temperature Field for Extruded Parts Based on Material Boundary Concept

作　　者：刘永志[1] 宋刚 李海梅[1] 申长雨[1] 

机构地区：[1]郑州大学国家橡塑模具工程研究中心,河南郑州450002

出　　处：《中国塑料》2005年第3期52-55,共4页China Plastics

基　　金：国家杰出青年科学基金项目(10225211);国家自然科学基金重大项目(10590352)

摘　　要：利用“材料边界”概念,应用传热学、有限元法和有限差分法基本原理,用线性三节点三角形单元数值求解了挤出冷却过程的截面瞬态温度场。将定型模与型材同时进行网格剖分,忽略定型模与型材之间的几何边界,利用物性参数不同而自然形成的物理边界,解决了定型模具与型材之间边界换热系数难以确定的问题,建立了相应的数学模型。通过将同一截面不同时刻的温度场分布与不同截面相同时刻的温度场进行等价,得到了该冷却过程的三维温度场。The transient temperature profile for extruded parts was solved using linear three node triangle elements based on heat transfer theory, finite element method (FEM), and finite difference method (FDM). The material boundary concept was introduced to deal with the boundary between the calibrating mould and the extruded parts. The mould and the extruded parts are mashed simultaneously. A physical boundary was set according to different heat material parameters while the geometrical boundary between the mould and the parts was abandoned. In this way the challenging problem of the heat transfer convection coefficient at the boundary between the mould and the parts was attempted. By equating the temperature distribution of a given profile at different time with that of different profiles at a given time, the 3D temperature distribution during cooling process was solved. Finally, a numerical example was given to verify validity of the method.

关 键 词：材料边界 挤出 温度场 数值模拟 

分 类 号：TQ320.66[化学工程—合成树脂塑料工业]