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为防止轧辊偏心引起GM-AGC(Gauge Meter Automatic Gauge Control)系统误动作导致厚差精度恶化,某铝厂引进的热精轧机组GM-AGC系统中采用了轧辊偏心动态死区法。给出动态死区法的设计思想及其构成;结合轧辊偏心信号的特点,分析动态死区的工作原理;根据GM-AGC系统的调节过程,推导引起GM-AGC系统误动作的厚度偏差与实际轧制力变化量的关系,从而解释动态死区设置的转换系数。实际应用效果表明,动态死区的死区宽度随着合成轧辊偏心信号的状态而变化,有效抑制了GM-AGC系统的误动作,阻止了厚差精度恶化,且能够适应轧制速度发生变化的情况。
In order to prevent the accuracy of the thickness difference from deteriorating due to the eccentricity of the roll caused by the GM-AGC (Gauge Meter Automatic Gauge Control) system, the roll eccentric dynamic dead zone method is adopted in the GM-AGC system of the hot finish rolling mill introduced by an aluminum plant. Based on the adjustment process of GM-AGC system, the thickness deviation caused by the malfunction of GM-AGC system is deduced and the actual working principle of dynamic dead zone is analyzed based on the characteristics of roll eccentricity signal. The relationship between the amount of rolling force changes, thus explaining the dynamic dead zone set conversion factor. The practical application shows that the width of the dead zone in the dynamic dead zone changes with the state of the eccentricity of the composite roll, which can effectively suppress the malfunction of the GM-AGC system, prevent the deterioration of the accuracy of the thickness difference and adapt to the change of the rolling speed Happening.