Abstract
In this paper, we propose an effective mechanical-electrical-hydraulic-interfacial coupling vibration model for hot rolling mills and obtain a practical measure to relieve mill vibration. First, an experiment related to mill modulus control gain in automatic gauge control (AGC) is carried out during manufacturing. Rolling mill vibration is observed to gradually be enhanced with increasing mill modulus control gain. Then, to explain this phenomenon, the mechanical-electrical-hydraulic-interface coupling dynamic model is modeled based on Sims’ rolling force method. Finally, we analyze the influence of mill modulus control gain on the vibration numerically on the basis of the coupling dynamic model. Moreover, the agreement between the experiment result and the simulation result is confirmed and the measure reducing the mill modulus control gain is obtained to relieve mill vibration.
Highlights
The mill vibration has become a bottleneck in the thin steel strip manufacturing [1, 2], as the mill vibration can cause unacceptable product quality degradation in the steel strip, and even severely damage the mill equipment [3, 4]
Many researchers think that rolling mill vibration is a kind of self-excited vibration
Yun et al [6,7,8] proposed a dynamic model that takes into account the effect of both the change in the roll gap spacing and the rate of change of the roll gap spacing on the rolling force and on the rolling torque
Summary
The mill vibration has become a bottleneck in the thin steel strip manufacturing [1, 2], as the mill vibration can cause unacceptable product quality degradation in the steel strip, and even severely damage the mill equipment [3, 4]. Improving on the dynamic model from Yun, Hu et al [9,10,11,12] proposed a new rolling process dynamic model that took strip tensions at entry and exit, strip thickness at entry, roll gap spacing and its rate of change, horizontal displacement of the rolls and its rate of change, and roll peripheral velocity as dynamic system inputs and regarded vertical rolling force, horizontal force, rolling torque, and strip velocity at entry and exit as outputs This choice is more reasonable from the standpoint of the manufacturing conditions in industrial rolling mills. A coupling dynamic mathematic model of hot rolling mill vibration, which includes the roll system, the mill rack, the hydraulic subsystem, automatic position control (APC), mill modulus control AGC and rolling process, is proposed. An experiment related to mill modulus control gain is carried out during manufacturing and the agreement between the experiment result and the simulation result is confirmed and the measure reducing the mill modulus control gain is obtained to relieve mill vibration
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
