Dynamic Modeling and Response Analysis of Defective Four-row Roller Bearings in Rolling Mills under Multi-load Excitation

doi:10.3901/JME.260102

Abstract

Abstract: As key components of the mill, four-row roller bearings with faults can intensify mill vibration, reduce the surface quality of products, and even lead to production accidents in severe service environments. A method is proposed for dynamic modeling and response characteristics of defective four-row roller bearings in rolling mills under multi-load excitation, addressing the limitations of existing dynamic methods which are confined to generic single-row bearings and rely on laboratory data, thereby failing to ensure model accuracy and validity. A model of the overall roll system and local bearing excitation load is constructed to accurately characterize the mechanical behavior and dynamic excitation during the rolling process. Based on this, a dynamic modeling method for rolling mill bearing faults is proposed to reveal the intrinsic relationship between fault characteristics and system responses. To further validate the effectiveness of the model and the method, an industrial test platform is built, and experimental verification is carried out with comparative analysis between theoretical results and measured data. Experimental results reveal that two distinct shock events are observed in contact load and acceleration signals during fault zone traversal: an initial slight load rebound is caused by sustained edge contact, followed by alternating load variations with high-frequency vibration between raceways. The system is shifted to low-frequency response through energy dissipation. During 3.2 mm SPA-H steel rolling, significant impacts and displacement fluctuations are caused by upper work roll bearing faults, destabilizing the roll gap, while the lower roll remains stable.

Key words: multi-load, rolling mill bearing, fault dynamics, industrial experiment

CLC Number:

TG133

LIN Shuilin, HU Bowen, SUN Jianliang, PENG Yan. Dynamic Modeling and Response Analysis of Defective Four-row Roller Bearings in Rolling Mills under Multi-load Excitation[J]. Journal of Mechanical Engineering, 2026, 62(4): 12-24.

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