Development of Gauge Control Technology on Tandem Cold Rolling Mill Combined with Pickling Line

摘要

In 1972, the tandem cold mill (TCM) at Kakogawa Works was started up as 5-stand batch type mill. In 1999, to respond the customers' severe request for gauge accuracy, the multi valuable automatic gauge control system (MVAGC) was installed and high accuracy of gauge control has been achieved. In 2002, to improve the productivity and the quality of cold-rolled products, the TCM line was combined with the pickling line and the threading and tailing off operations do not have been required. Before the combination, the mill operator corrected the pass schedule to apply MVAGC at threading. After that, the mill operator could not find operating time to correct the pass schedule calculated by the process computer, and the MVAGC was not usually applied. In order to use the MVAGC at the combined pickling and tandem cold mill, we have reconstructed the pass schedule setting method and the prediction model of rolling load for the pass schedule setting. As a result, MVAGC has been applied form head to tail of coil and off-gauge length has been successfully reduced. This paper describes the outline of the MVAGC system, the newly developed pass schedule setting method, prediction model of rolling load and the actual operation in TCM.