多参数耦合下冷轧铝带工作辊分段冷却调节特性

Multi-parameter coupled subsection cooling regulation characteristics of work rolls in aluminum cold rolling

为得到多参数耦合下冷轧铝带工作辊分段冷却调节特性,建立了工作辊和轧件的一体化耦合传热模型.耦合传热建模过程包含工作辊和轧件导热微分方程的建立、轧件变形热和摩擦热的求解、换热边界条件的确立、工作辊热辊形的计算及采用二维交替差分对微分方程进行求解.仿真结果表明,同一轧制参数下工作辊分段冷却正负方向调节能力近似相等,但单向调节幅度受轧制参数影响较大,轧制长度、喷射梁工作压力和摩擦系数的增加对分段冷却调控能力具有促进作用,轧制速度的作用则相反.

A coupled heat transfer model of work rolls and an aluminum strip is established to obtain the multi-parameter coupled subsection cooling regulation characteristics of work rolls in aluminum cold rolling. This coupled model includes building the thermal conduction differential equation of the work rolls and strip,solving the strip deformation heat and friction heat,establishing the heat transfer boundary conditions,calculating the work roll thermal crown,and solving the differential equations by using a two-dimensional alternating difference method. Simulation results show that the positive and negative adjustment domains are approximately equal at the same rolling parameters,but each domain is affected by rolling parameters. The increase of rolled length,header pressure and friction coefficient has positive effect on the subsection cooling control ability,while the rolling speed is on the contrary.