非光滑带钢在粗糙轧辊平整轧制过程中表面微观形貌的转印行为与演变规律

Transfer behaviors and evolution of surface micromorphology of non-smooth strip in temper rolling process with rough roller

针对平整轧制过程不同用途带钢对表面微观形貌的特殊要求,在批量跟踪电火花毛化轧辊、磨削轧辊和冷轧后带钢表面微观形貌的基础上,建立工作辊与带钢都可考虑真实表面粗糙峰的带钢表面微观形貌轧制转印生成模型,采用工业实验验证了仿真模型的准确性,并据此模型分析轧制前带钢已经具有表面粗糙度分别大于、等于、小于轧辊表面粗糙度时,带钢表面微观形貌的轧制转印行为与遗传演变规律.提出了负转印和转印饱和的概念,定义了两种极限轧制转印状态的描述指标——负转印最大和转印饱和,研究发现当带钢表面粗糙度小于或等于轧辊表面粗糙度时,存在负转印最大点和转印饱和点;当带钢表面粗糙度大于轧辊表面粗糙度时,负转印最大点和转印饱和点重合.在此基础上,采用负转印最大点与转印饱和点对应的临界板宽轧制力,描述带钢表面微观形貌的遗传及演变规律,并系统仿真分析带钢屈服强度、带钢轧前表面粗糙度、轧辊表面粗糙度等工艺条件参数对于负转印最大点与转印饱和点对应的临界单位板宽轧制力的影响规律,发现随着带钢屈服强度增大和轧辊表面粗糙度增加,该临界单位板宽轧制力均增大;随着带钢表面粗糙度增大,负转印最大点对应的临界单位板宽轧制力增大,但转印饱和点对应的临界单位板宽轧制力却减小.

To meet special requirements and respond to control problems of surface micromorphology of different strips in skin rolling process,a rolling transfer generation model of the surface micromorphology contact between work roll and actual rough surface of strip was established on the basis of batch tracing the surface micromorphology of electric discharge textured roll,grinding roll and cold rolled strip.The inheritance and evolution of surface micromorphology of the strip was analyzed based on the generation model and the accuracy of the generation model was verified by industrial experiments.The concepts of negative transfer and transfer saturation were proposed,and the descriptive indicators for two extreme rolling transfer status(the maximum negative transfer and transfer saturation)were defined.When strip surface roughness is equal to or less than that of roll,a maximum negative transfer point and transfer saturation point exist,while when strip surface roughness is greater than that of roll,the maximum negative transfer point is in superposition with the transfer saturation point.Under the above precondition,through the rolling force of critical strip width,which corresponds to the maximum negative transfer point and transfer saturation point,the inheritance and evolution of surface micromorphology of the strip were characterized.The effect of strip yield strength,strip surface roughness,and roll surface roughness on the rolling force of critical strip width corresponding to maximum negative transfer point and transfer saturation point were also analyzed.Results show that with the increase of strip yield strength and roll surface roughness,the rolling force of critical strip width corresponding to maximum negative transfer point and transfer saturation point increases.With the increase of strip surface roughness,the rolling force of critical strip width corresponding to maximum negative transfer point increases,and the rolling force of critical strip width corresponding to transfer saturation point decreases.