冷轧卷取机张力控制研究

Research on Tension Control of Cold Rolling Coiler

在带钢冷轧过程中,卷取机是保证产品质量的关键设备。冷带钢卷取的张力直接影响带钢的质量和尺寸精度,合适的张力轧制可以降低轧制负荷,使板形平直,提高带钢表面质量,所以冷轧时对张力控制有严格的要求。为了得到高质量的带钢,冷轧必须在各段设置合适的张力,并能够在各种干扰下保持张力恒定。针对入口段的张力波动影响因素进行了分析,得出了影响张力波动的关键因素,推导出影响张力波动的转速和转矩表达式,并通过卷径计算设计出转速和电流的双PID闭环控制器,进行了各种工况下的仿真,发现加入动态补偿后可以实现较稳定的张力控制,结论可以为现场实际控制系统提供设计依据。

In the cold rolling process of strip steel,the coiler is a key equipment to ensure product quality.The tension of cold strip steel coil directly affects the quality and dimensional accuracy of the strip.Proper tension rolling can reduce the rolling load,make the plate shape straight,and improve the surface quality of the strip.Therefore,there are strict requirements for tension control during cold rolling.In order to obtain high⁃quality strip steel,it is necessary to set appropriate tension,and be able to maintain constant tension under various interferences.An analysis was conducted on the influencing factors of tension fluctuation in the entrance section,and the key factors affecting tension fluctuation were identified.The expressions for speed and torque that affect tension fluctuation were derived.A dual PID closed⁃loop controller for speed and current was designed through coil diameter calculation.Simulations were conducted under various working conditions,and it was found that adding dynamic compensation can achieve stable tension control.The conclusion can provide a design basis for the actual control system on site.