Angular Clearance Monitoring for Mechanical Transmissions of Rolling Mill Stands

Abstract

AbstractThe proposed scientific research results are aimed at preventing accidents caused by failures of mechanical equipment of horizontal plate mill stands. Dynamic load reduction in electromechanical systems of rolling mills is addressed as a currently relevant topic. The design of the main roll line of the “5000” mill is considered. The closure of angular clearances in spindle joints is noted as the cause for unacceptable shock loads during metal gripping by rolls. This causes elastic moment variations, which lead to fatigue fractures and spindle head damage. Accidents can be prevented by continuous monitoring of angular transmission clearances with alerts issued to the personnel in cases when they increase. For this purpose, a mechanical transmission monitoring technique is proposed based on the automatic periodic measurement of angular clearances. An angular clearance observer is proposed, providing clearance value calculation using the speed and electromagnetic torque signals. A periodic clearance monitoring algorithm is proposed for mill stand idling due to scheduled roll replacement. Oscillograms are presented confirming the possibility of practical implementation of this algorithm. The simulation model of a dual-mass electromechanical stand system is considered. The conducted studies are based on mathematical modeling. An example of determining the angular clearance value is provided. The structure of an automated monitoring system is proposed, which includes the modules for data acquisition and storage. The prospects for further developments are proposed.KeywordsPlate millMill standMechanical gearsAngular clearanceMonitoringSystemTechniqueObserverDevelopmentModelingExperimentEfficiency