高牌号硅钢冷轧中间辊服役损伤机理分析

Analysis of Service Damage Mechanism of High Grade Silicon Steel Cold Rolling Intermediate Roll

轧制高牌号硅钢的连轧机,轧制难度提升,轧制事故率增加,导致服役下机的冷轧工作辊和中间辊辊面损伤概率增加。在磨削维护后进行检测,经常存在涡流检测不合格,对磨辊间的运维和轧辊检测处置造成很大困难。通过对受伤下机的冷轧中间辊辊面进行理化检测分析,发现导致其涡流检测不合格的原因为局部应力变化。通过常温时效处置或去应力回火可以有效恢复中间辊辊面状态,常温时效时间为60~80 d,去应力回火工艺为300℃×12 h,经过处置后的损伤中间辊,应力降低40%以上。再次磨削后,检测合格率大大提升,降低了冷轧中间辊再次上机的使用风险。

For the continuous rolling mill of high-grade silicon steel,the difficulty of rolling increases,the accident rate of rolling increases,and the probability of damage to the cold rolling work roll and intermediate roll surface of the in-service machine increases.After grinding and maintenance,there are often eddy current inspections that fail.Bringing a lot of confusion to the operation and maintenance of the grinding rolls,as well as the detection and disposal of the rolling rolls.Through physical and chemical inspection and analysis of the injured cold rolling intermediate roll surface,it was found that the reason for the unqualified eddy current inspection was local stress changes.The intermediate roll surface state can be effectively restored through room temperature aging treatment or stress relief tempering.The room temperature aging time is 60~80 days,and the stress relief tempering process is 300℃×12 h.After treatment,the stress of the damaged intermediate roll is reduced by more than 40%,and the inspection qualification rate is improved after re-grinding.And it reduce the risk of using the cold rolling intermediate roll again on the machine.