首钢迁钢2250mm热连轧生产线在2006年底投产后1年多的时间里,带钢的板形控制精度较低,需要进一步提高.粗轧后中间坯存在镰刀弯、负凸度和楔形大的板形问题,导致精轧控制稳定性差,造成板形控制精度较低.为了解决粗轧中间坯板形的问题,在粗轧R2机架上设计并应用了6次多项式变接触支持辊辊形和负凸度工作辊辊形,取代了原来采用的平辊形.此支持辊辊形可以使辊间接触长度随所轧制带钢宽度变化,消除了有害接触区,使得辊间接触应力均匀化,并提高了辊缝横向刚度,改善了轧辊的磨损辊形,并提高了板形调控能力.工作辊负辊形弥补了工作辊的热凸度,增强了板坯轧制过程的对中和稳定性.此支持辊辊形与工作辊辊形配置使用,大幅改善了中间坯的凸度、楔形和镰刀弯等板形质量,使得热轧产品的板形质量有10%左右的提高.
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