关键词: 辊系变形, 影响函数法, 工作辊接触, 冷轧, 板形

Abstract: To investigate the influence of the direct contact between work roll surfaces outside workpiece width on thin strip cold rolling process, a simulation model was developed by means of influence function, with which the production data during rolling were taken to calculate the roll deformation on a four-high mill. Such distributive data as contact pressure, strip thickness and tensile stress were calculated to analyze the effect of work roll surface contact mentioned above on the distribution of rolling force, strip thickness, and tensile strength at exit and strip shape. It was found that when the work roll surface contact occurs, the rolling force decreases at the verge of strip, while the contact pressure between the surfaces of work roll and back-up roll increases at the end of back-up roll. The direct work roll contact enables both the strip crown and transverse thickness difference to decrease, thus resulting in thinning down the strip verge and it also makes the distribution of tensile stress at exit more uniform so as to improve strip shape and flatness.