冷连轧机动态变规格机架速度控制策略及规律

针对冷连轧机动态变规格特性,提出了以变规格前的带钢张力设定值为控制目标的变规格机架速度控制策略. 通过建立张力作用下带钢弹性变形的数学解析模型,推导计算了单步小压下变规格时变规格机架的速度控制规律,并根据流量相等原则对变规格后的冷连轧机前面机架进行速度设定. 当变规格前后带钢的几何尺寸或材料特性差异较大时,提出利用楔形段方式完成动态变规格,采用上述张力控制目标策略推导计算了楔形段动态变规格方式每个中间厚度的轧制速度和辊缝设定值控制规律. 本策略可将变规格造成的厚度偏差控制在变规格机架之间,同时避免了变规格机架与其他机架轧制因素通过张力的耦合,使轧制过程的动态变规格控制易于实现.

Speed control strategy and rule of the FGC stand in a tandem cold rolling mill

According to flying gauge change(FGC) characteristics of a tandem cold rolling mill(TCM),a speed control strategy of the FGC stand with the strip tension set-point before FGC as a control target was put forward.Based on the developed analytic mathematic models of strip elastic deformation under tension between stands,the speed control rule of the FGC stand was derived under the condition of small gauge change by single step,and the speed of the other stands having finished the FGC process was calculated based on the constant mass flow principle.When the dimensions or material properties of two kinds of strips varied great,the method using wedge was also took to carry out FGC,and the control rules of rolling speed and gauge set-point for every thickness of the wedge were derived and calculated by using the developed strategy.The deviations of strip thickness produced by FGC were limited in the stands before and behind the FGC point,and the interference of the FGC stand to the others was eliminated,then the process control for FGC could be implemented easier.