面向辊形磨削的热带钢连轧机工作辊热变形研究

热带钢连轧机工作辊下机后尚未完全冷却即进行磨削,残存的不均匀热变形导致磨削的工作辊辊形在空冷一段时间上机时很难达到工艺设定值.针对热辊形不易测量的特点,制定合理的物理测量方式,准确地测量了工作辊下机后的温度分布和热辊形.考虑复杂的工作辊换热边界条件,采用有限差分法对工作辊空冷时的温度场和热变形进行了数值模拟,计算结果与测试结果吻合良好.对工作辊下机后不同时刻的热变形进行仿真,通过将目标上机辊形和磨削时热辊形叠加来设定磨削辊形,为实现合理的辊形磨削提供了依据和计算方法.

Shape Grinding-Oriented Thermal Deformation Research of Work Roll of Hot Strip Rolling Mill

For hot strip rolling mill the work rolls are ground at warm after rolling. The shape of ground cooled work rolls is difficult to reach the set value because of the remaining uneven thermal deformation. Due to difficulties of measurement,a reasonable physical measurement method was established, and the temperature distribution and thermal roll shape of work roll after rolling can be accurately measured. The complicated heat transfer boundary conditions of work roll were taken into account and the numerical simulation was made with finite difference analysis to determine the temperature field and thermal deformation of work rolls cooled in the air. The computed and measured results coincided satisfactorily. The thermal deformation of work roll at different time after rolling should be simulated and the shape of groumd roll can be set by the superposition of target roll shape before rolling and the thermal roll shape at grinding ,in this way a basis and computation method for appropriate roll shape grinding are provided.