大型整体壁板用扁挤压筒的温度场及热应力分析

Analysis of temperature field and thermal stress of multilayer flat container for extruding aluminum sheet with flange by FEM

采用弹性有限元法对生产大型整体壁板用扁挤压筒的温度场和热应力场进行了数值模拟 ,获得了扁挤压筒在不同加热条件和装配条件下的温度分布及热应力分布情况。结果表明 ,对内孔尺寸为 850 mm× 2 50 mm的三层和四层扁挤压筒 ,有中间层加热圈时温度场的分布比无加热圈时的情形较为均匀 ;内孔尺寸为 850 mm× 2 50 mm的四层扁挤压筒 ,由于扁挤压筒内的温度不均匀分布所引起的最大热应力高达 50 0 MPa以上 ;

Temperature and thermal stress fields of multilayer flat container for extruding aluminum sheet with flange have been simulated by elastic FEM under different heating condition and shrink fitting range. The results show that 3 layer or 4 layer flat container of hole size 850mm×250mm with middle heating ring has more unifomal temperature distribution than that without middle heating ring. The highest thermal stress caused by non uniformal temperature distribution in 4 layer flat container of hole size 850mm×250mm is over 500MPa, the maximum equivalent thermal stress in the container can be reduced more or less by adding middle heating ring