Title: Characteristics of rolling interface lubrication considering contact topography variation based on fractal theory

Authors: Huajie Wu; Qiaoyi Wang; Laihua Tao

Addresses: School of Mechanical Engineering, Hangzhou Dianzi University, Hangzhou, 310018, China; School of Transportation Engineering, Yangzhou Polytechnic Institute, Yangzhou, 225127, China ' School of Mechanical Engineering, Hangzhou Dianzi University, Hangzhou, 310018, China ' School of Mechanical Engineering, Hangzhou Dianzi University, Hangzhou, 310018, China

Abstract: This paper investigates the lubrication characteristics of line contact in the rolling interface, and applies the predictive method of surface roughness deformation amplitude. Based on the data of the surface roughness of the strip, an initial profile function of the rolling interface is constructed by the Weierstrass-Mandelbrot function. By incorporating the rolling lubrication model and modifying relevant algorithms, the oil pressure reference factor and film thickness reference factor are introduced to study the relationship between rolling load, rolling speed, reduction ratio, and the lubrication characteristics of the deformed surface roughness of the rolling strip. The research results show that there is a pressure peak appears at the inlet, and the oil film thickness exhibits a wedge shape in the work zone. Considering surface roughness deformation results in significant differences, with the oil pressure reference factor increasing by approximately 24% and the film thickness reference factor increasing by about 2.9 times.

Keywords: fractal theory; roughness deformation; rolling interface; lubricating oil film; oil film pressure.

DOI: 10.1504/IJSURFSE.2024.141506

International Journal of Surface Science and Engineering, 2024 Vol.18 No.3, pp.204 - 228

Received: 24 Aug 2023
Accepted: 30 Nov 2023
Published online: 18 Sep 2024 *

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