棒材DROF工艺粗轧阶段工艺参数对轧件头尾温差的影响

Effect of DROF process parameters of bar on temperature difference between rolled piece head and tail during rough rolling stage

针对棒材免加热直接轧制技术在轧制生产中常有轧件温度头低尾高以及同批次产品头尾性能差异较大等问题,以某钢铁公司实际棒材直轧生产线为参考,以粗轧阶段轧制工艺参数为研究对象,利用ABAQUS有限元软件建立了粗轧阶段三维热力耦合模型,从优化粗轧阶段轧制速度、轧辊直径和延伸系数等相关工艺参数角度研究改进头尾温差的方法。研究结果表明,轧件头尾温差随轧制速度的减小而降低,随辊径的减小而降低,随延伸系数的增大而降低,通过优化以上粗轧阶段相关工艺参数可以使轧件头尾温差降低20℃以上,缩小同批次产品的性能波动。

Aiming at the problems that the temperature of rolled piece is low at tail and high at head,and the performance difference of head and tail of products in the same batch is high in the rolling production of direct rolling of free-heating(DROF)for bar,taking the actual bar direct rolling production line of an iron and steel company as reference,taking the rolling process parameters in rough rolling stage as the research object,the three-dimensional thermodynamic coupling model of rough rolling stage was established by ABAQUS finite element software.The method for improving the temperature difference between head and tail was studied from the aspects of optimizing the rolling speed,roll diameter and elongation coefficient.The results show that the temperature difference between the head and tail of rolled piece decreases with the decrease of rolling speed,decreases with the decrease of roll diameter,and decreases with the increase of elongation coefficient.Temperature difference between the head and the tail of the rolled pieces can be reduced by more than 20℃by optimizing the process parameters related to the rough rolling stage and the performance fluctuation of the same batch of products is reduced.