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该文分析某2250不锈钢热连轧粗轧机频繁发生支持辊严重边部剥落难题的影响因素。通过理论及实际剥落断口形貌分析,指出世界上不锈钢产量最大的该生产线复杂轧制工艺条件和服役期内辊系力学行为引起的不均匀辊间接触压应力分布是该轧机轧制过程中轧辊剥落的主要原因。根据现场跟踪实测数据,采用大型通用有限元软件建立了四辊轧机辊系三维有限元模型,仿真分析了带钢宽度、轧制力、轧辊磨损对辊间接触压应力峰值和位置的影响。结果表明:随着带钢宽度和轧制力的增大,辊间接触压力峰值增幅明显,辊间接触压力分布不均匀度系数基本不变;在不同磨损阶段,当工作辊和支持辊都处于服役后期时,压力峰值、不均匀度系数显著增大,均在距轧辊辊身边部附近存在接触压应力尖峰,且此位置与实际剥落位置一致。研究结果为成功研制的新支持辊形技术投入长期稳定工业应用累计轧制600万t以上未再发生剥落提供了理论依据。
This paper analyzes the factors that cause frequent severe spalling problems of supporting rollers in a 2250 stainless continuous mill. According to the theoretical and practical analysis of fracture surface morphology, it is pointed out that the distribution of the contact compressive stress between inhomogeneous rollers caused by the complex rolling process conditions of the production line with the largest stainless steel output in the world and the mechanical behavior of the roller systems during service period is the rolling force of the rollers The main reason for spalling. According to the measured data from the field, a three-dimensional finite element model of roller system of four-high mill was established by using large-scale general finite element software. The influence of strip width, rolling force and roll wear on the contact peak pressure and position between rollers was simulated. The results show that with the increase of strip width and rolling force, the peak value of contact pressure increases obviously and the coefficient of contact pressure distribution unevenness keeps almost unchanged. When the work roll and backup roll are in different wear stages, In the late stage of service, the peak pressure and the coefficient of non-uniformity of pressure increased significantly, and there was contact pressure stress spike near the edge of roller body, and this position was consistent with the actual spalling position. The research results provide a theoretical basis for the newly supported roll-shaped technology successfully developed into the long-term stable industrial application of rolling of 6 million tons or more without peeling off again.