60 kg/m重轨冷却过程中的温度场有限元模拟及分析

 采用ANSYS热模拟以及对实际温度连续测量实验，研究了重轨在步进式冷床上冷却过程的温度分布。重轨表面温度、矫前温度及相对应的冷却时间计算值与实测结果基本相符。模拟结果表明，重轨断面温差最大值达到9112 ℃，而冷却到矫前温度时温度分布均匀，断面温差不超过5 ℃，断面最大温差随着换热系数的增大而增大。在重轨断面温差出现最大值之前，适当减小冷却速度，可使断面温度分布均匀，并且可通过增设风机有效提高冷床的冷却能力。

Finite Element Simulation and Analysis of Temperature Field of 60 kg/m Heavy Rail During Cooling

The temperature field of heavy rail during cooling in walking beam cooling bed has been studied using ANSYS thermal analysis and continuously measuring the actual temperature. The theoretical prediction values of the surface temperature of heavy rail, the straightening temperature and corresponding cooling time are in reasonable agreement with experimental results. The simulation shows that the maximal temperature difference in cross section of heavy rail is 9112 ℃, and the temperature distribution is uniform when heavy rail reaches straightening temperature, and the temperature difference is not exceeded by 5 ℃, and the maximal temperature difference in cross section of heavy rail increases with the increase of heat transfer coefficient. The temperature distribution in cross section can be more uniform by reducing the cooling velocity before coming to the maximal temperature difference, and the capacity of walking beam cooling bed can be changed through adding fans.