Improving the Algorithm of Automated Gage Control during Shaped Feed Rolling on a Plate Mill

Abstract

It was noted that the cause for increased waste during plate rolling is the plate shape deviation (non-rectangular). An efficient method for improving the plate sheet (in plan view) is forming conical shapes on the head and end areas in final runs during broaching and width breakdown. The paper presents the ASC (automated size control) technology that incorporates a multiple-point strategy for gage setting along the rolling length. The paper considers a simplified structural diagram of the automated gage control system (AGCS) of plate mill 5000. Following the oscillogram analysis, it was concluded that the gage control accuracy in shaped rolling areas, upon the given AGCS configuration, is intolerable. The paper suggests a method for enhancing the accuracy of controlling with affecting the screwdown device position in the gage setting signal function (feedforward control). The paper presents the structure of a double-circuit AGCS with an additional setting signal-based control channel. Also, this paper presents the analysis of time relationships of the feed gage derived from simulation modeling during implementing the designed and developed algorithms. The reduction in the control error by means of enhancing the AGCS operating speed was proven. Oscillograms obtained during implementing the developed algorithms in the APCS of the plate mill 5000 reversing stand were analyzed. It was proven that the quality of the plate rolled was improved by virtue of reducing the gage difference in end areas.