热装组合式冷轧支承辊热装过盈量范围研究

Research on the Shrinkage Range for the Composite Back-Up Roll in the Strip Cold Rolling

为确定准确的组合式支承辊热装过盈量范围,考虑了辊套尺寸及其物理性能参数、辊套内表面状态以及轧制条件的影响,推导出了考虑扭矩传递、辊套热膨胀以及辊套表面状态的最小过盈量计算公式以及考虑辊套屈服强度以及等效应力的最大过盈量计算公式,分析了辊套厚度、热装配合面摩擦系数、辊套屈服强度以及轧制过程中传动方式、辊套外表面温度等参数对热装过盈量范围的影响规律,并且基于ABAQUS软件模拟了不同过盈量、辊套厚度时的等效应力并与解析结果进行了比较。研究结果表明:辊套厚度每增大50mm,过盈配合所需最小过盈量减小0.03mm左右,而最大过盈量减小0.07mm左右;辊套屈服强度每增大50MPa,过盈配合可选的最大过盈量增大0.08mm左右;辊套外表面温度每升高5℃,过盈配合所需最小过盈量增大0.06mm左右。

During the shrinkage fit process of the composite back- up roll by the roll sleeve and the roll mangle,the shrinkage fit parameters,such as the thickness of roll sleeve,the shrink range and the friction coefficient of fitting surface between the roll sleeve and the roll mangle,influence the performance of composite back- up roll greatly. To determine the shrinkage range,the working roll drive and back- up roll drive were taken in account individually,and the influence of the condition of strip cold rolling and the size and mechanical property parameter of roll sleeve and roll mangle were considered. The equations for calculating the shrinkage range and assembly stress were then proposed. On the base of these equations,the influences of the thickness of roll sleeve and the friction coefficient of fitting surface on the shrinkage range were analyzed. Moreover,the shrinkage fit process of the composite back- up roll was simulated by the ABAQUS based on the FEM methods,and the results of effective stress were compared with the analytical results. The results indicated that the minimum shrink range would decrease by 0. 03 mm and the maximum shrink range would decrease by 0. 07 mm with the increase of the thickness of sleeve by 50 mm,and the maximum shrink range would increase by 0. 08 mm with the increase of yield strength by 50 MPa. Moreover,the minimum shrink range increased by 0. 06 mm with the increase of the outer surface temperature of sleeve by 5 degrees Celsius.