This study discusses the technological aspects of a nonroutine start with an unreduced strip using the example of a five-stand cold rolling mill 2000. We analyze the existing system for automatic control of strip thickness and tension when starting a mill with an unreduced strip. Such a start is shown to be the most critical process in terms of the level of disturbing influences, and with the initial structure of the system for automatic control of thickness and tension, one cannot ensure a sufficient level of trouble-free operation of electric drives of roll mill stands at low rolling speeds. We propose installing rest tension regulators (RTRs) to reduce the “dead zone” of tension regulation and loss of controllability, i.e., when opening the control loop. Additionally, it is proposed to transform the existing structure of tension regulators to influence the rate of the stands. After analyzing the statistical information obtained at the mill, we can say that upon introducing RTRs, no case of “virtual” strip breakage was recorded at the start of the process.

本研究以 2000 年五机架冷轧机为例，讨论了未减薄带钢的非常规启动的技术问题。我们分析了在未减薄带钢启动轧机时自动控制带钢厚度和张力的现有系统。就干扰影响水平而言，这种启动被证明是最关键的过程，并且由于厚度和张力自动控制系统的初始结构，无法确保电力驱动器的足够水平的无故障运行轧机处于低轧制速度。我们建议安装静止张力调节器（RTR），以减少张力调节的“死区”和可控性损失，即打开控制回路时的“死区”。另外，建议对现有张力调节器结构进行改造，以影响机位率。在分析了工厂获得的统计信息后，我们可以说，在引入 RTR 后，在流程开始时没有记录到“虚拟”带钢断裂的情况。