粗轧中间坯走偏对镰刀弯的影响分析和控制

Analysis and Control of Effect of Slab Deviation on Camber in Rough Rolling

针对某常规热连轧粗轧中间坯的镰刀弯问题,首先使用ABAQUS/Standard建立轧辊-轧件静力学耦合模型,定量计算了不同入口厚度、宽度、压下量、两侧温度差和工作辊初始辊形下的入口中间坯走偏因素对出口中间坯楔形的影响,同时,得到变形后的工作辊辊形曲线;再使用ABAQUS/Explicit建立动态分析模型,并采用此辊形曲线作为动态模型的工作辊辊形,在与静力学分析相同的走偏工况下,模拟中间坯镰刀弯现象,进一步计算了不同入口厚度、宽度、压下量、两侧温度差和工作辊初始辊形下的入口中间坯走偏因素对出口中间坯镰刀弯的影响。基于上述计算结果,提出了优化粗轧侧导板的开口度裕量和工作辊初始辊形的方案,提高了轧制过程对中性,从而改善了中间坯镰刀弯现象,使中间坯中心线偏移量未达标率从6.51%下降到2.93%,取得了显著的效果,同时成品楔形命中率达到89%以上,极大提高了产品质量。

For the problem of slab camber in rough rolling of a conventional hot rolling, the static coupling model of roll and slab was firstly established by using ABAQUS/Standard and the quantitative effect of entry slab deviation factor of the different entry thickness, width, reduction, temperature difference on both sides and initial work roll contour on existing slab wedge was calculated. Meanwhile, the work roll contour after the static model was obtained. Then, in the same condi- tions of entry slab deviation factor, the dynamic simulation model established by ABAQUS/Explicit simulated the phenom- enon of slab camber, which adopted the work roll contour of static model calculation, and further calculated quantitatively effect of entry slab deviation factor of the different entry thickness, width, reduction, temperature difference on both sides and initial work roll contour on exit slab camber. Based on the above calculation results, the opening gap margin of side guide and initial work roll contour of rough rolling was optimized to enhance the alignment during the course of rolling. The centerline deviation values which do not meet the standard rate declined from 6.51% to 2.93%, and the wedge hit rate of products was improved to 89% through using the above method. Thus, the above method to improve the phenomenon of slab camber achieved remarkable results and greatly improved the quality of products.