The causes of the head size over tolerance of large size hot rolled ribbed bars are analyzed.By improving the structure bearing bracket,this problem was resolved well.

• 分析了在横列式轧机轧制大规格热轧带肋钢筋时头部葫芦状尺寸超差的产生原因，通过改进轴承座结构，有效地解决了这一问题。