Coordinating the Modes of the Axial Roll Shifting and Roll Bending Systems of a Roll Mill Stand

Automatic control of a rolled workpiece profile is recognized as a powerful tool that helps improve the quality of rolling mill products. The paper reviews a CVCPlus technology with a WRB system of work roll bending in the process of rolling. It considers the functions of the axial shifting system for S-shaped work rolls (WRS) within CVC. It is noted that the interconnected operation of these systems has been studied insufficiently. The authors present a functional diagram for the automatic system of gap profile and roll bending adjustment on a 5,000 mm plate mill. They analyze the oscillograph records that describe operation of the WRB and WRS systems. The authors point out the flaws in the settings of these systems and provide rationalization for ways of their improvement. A new algorithm ensuring enhanced performance and higher accuracy of force control in the hydraulic cylinders of the WRB system is proposed. An algorithm for reducing the force in the WRS hydraulic cylinders in CVC-motion mode is introduced. The oscillograph records obtained in the process of implementation of the proposed algorithms are provided. It was verified that the obtained results complied with the expected ones. The developed algorithms are recommended for implementation on the 5,000 mm mill.