适应变速轧制的精细化轧件温度计算和控制模型

发布时间：2018-10-31 15:11

【摘要】：针对因变速轧制和复合冷却带来的卷取温度模型预报精度降低的问题,以热输出辊道上的冷却设备布置信息和辊间冷却换热形式为出发点,采用Crank-Nicolson(C-N)六点格式有限差分方法构建轧件轧后冷却温度计算模型;以前馈为主、反馈为辅,不断进行自学习来对轧件冷却温度进行控制,在精轧出口按照固定时间周期对轧件进行分段采样和前馈设定,在卷取入口按照长度进行分段采样和周期性反馈控制;为使模型适应升速轧制和因终轧温度控制所带来的速度扰动叠加的速度变化,对轧件在冷却区的运动进行精确的位置跟踪,并在冷却区中增设速度补偿区,对设定的冷却规程进行更新以补偿升速带来的冷却不足或降速引起的过冷.新的卷取温度模型以辊间冷却为计算单元,可有效地集成不同的冷却形式,并对变速轧制过程进行有效适应.自现场应用以来,卷取温度设定精度和控制稳定性大幅度提高.
[Abstract]:Aiming at the problem of low prediction precision of coiling temperature model caused by variable speed rolling and compound cooling, the cooling equipment layout information on the heat output roller table and the cooling heat transfer form between rollers are taken as the starting point. The Crank-Nicolson (C-N) six-point finite difference method is used to construct the model of post-rolling cooling temperature. With feedforward as main, feedback as auxiliary, continuous self-learning to control the cooling temperature of rolling piece, sampling and feedforward setting of workpiece according to fixed time period at finish rolling outlet, Section sampling and periodic feedback control are carried out at the take-up entrance according to the length; In order to adapt the model to the superposition of velocity disturbance caused by rising rolling and final rolling temperature control, the movement of workpiece in the cooling zone is tracked accurately, and a velocity compensation zone is added to the cooling zone. Update the set cooling procedures to compensate for insufficient cooling or undercooling due to deceleration. The new coiling temperature model takes the cooling between rollers as the calculation unit, which can effectively integrate different cooling forms and adapt to the variable speed rolling process effectively. Since the field application, the precision of coiling temperature setting and control stability have been greatly improved.
【作者单位】：东北大学轧制技术及连轧自动化国家重点实验室;首钢京唐钢铁联合有限责任公司;
【基金】：国家自然科学基金资助项目(51034009)
【分类号】：TG334.9

【参考文献】