铜包铝复合电力扁排热轧过程温度场的数值模拟

Temperature Field Numerical Simulation of Copper Clading Aluminum Composite Electric Flat Row in Hot Rolling Process

采用刚塑性有限元法,以大型有限元软件DEFORM-3D为分析工具,考虑界面接触传热,对铜包铝复合电力扁排热轧成形过程进行了三维温度场模拟。结果表明:在轧件开始咬入与轧辊接触后,纯铜表面中部的温度先降低后升高,由于纯铜与轧辊的接触传热,轧辊与纯铜的接触部分温度低于铜包铝扁排侧部金属的温度;由于接触摩擦与塑性变形功转化为热量,开始轧制后轧件表面温度有所升高;轧制后铜包铝排铜层表面和铝芯的边部温度高于中部温度,由表及里温度升高;随着压下率的增大,在变形区轧件温度升高幅度增大;随着轧制速度的提高,在变形区铜层和铝芯温度变化更为剧烈,轧制后温降速率减小。

Taking large finite element sotiware DEFORM-3D as analysis tool, using rigid plastic finite element method, considering interracial heat transfer, the hot forming process for three-dimensional temperature field of the copper clading aluminum composite power fiat rows was simulated. The simulation results show that： when the rolled piece contacted with the rollers, the temperature at middle surface of the pure copper first decrease and then increase; as the interfacial heat transfer between the pure copper and the roller, the temperature at contact part of pure copper and the roller is lower than that of the metal of side copper clading aluminum row; as contact friction and plastic deformation work transfer to quantity of heat, the surface temperature of the rolled piece rises to some extent when rolling started. The surface temperature of copper and copper clading aluminum row and side temperature of aluminum conductor are higher than that of middle part. The temperature increases from the outside to the inside. With the increases of reduction rate, the risen degree of the temperature of the rolled piece at deformation zone increases. With the rolling rate increasing, the temperature change of surface copper and aluminum conductor at deformation zone are severe. The temperature drop rate decreases after rolling.