热连轧机工作辊总成预热仿真

Preheating Simulation of Hot Continuous Rolling Mill Work Roll Assembly

在冬季,低温换辊时工作辊在工作时就会产生很大的热应力。在热—机械应力作用下,会导致工作辊磨损和剥落。基于能量守恒定律和傅里叶传热学定律,在柱坐标中建立了热连轧机工作辊总成的轴对称瞬态温度场数学模型,并建立了相应的有限元仿真模型。对比了镁碳质砖冷却过程的实验与有限元仿真结果,发现最大误差为4.7%,间接验证了工作辊总成有限元模型的正确性。随后由工作辊总成温度场仿真结果确定了预热热源的最佳温度、风速等工艺参数。

In winter, the work roll produces the great thermal stress when low temperature replacing the roller. In the thermal mechanical stress, working roll will wear and peel off. Based on the law of conservation of energy and the Fourier heat transfer law, the mathematical model of axialsymmetric transient temperature field for hot continuous rolling mill work roll assembly was established in the cylindrical coordinates. And the corresponding finite element simulation model was set up. Compared with results of experiment and finite element simulation of the magnesium carbon brick in cooling process, it is found that the maximum error is 4.7%, which indirectly verifies the correctness of the work roll assembly finite element model. Subsequently, the optimum temperature, wind speed and other process parameters were ascertained by the simulation results of the temperature field of working roll assembly.