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Non-linear dynamics of inlet film thickness during unsteady rolling process

  • Tribology and Lubrication
  • Published:
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Abstract

The inlet film thickness directly affects film and stress distribution of rolling interfaces. Unsteady factors, such as unsteady back tension, may disturb the inlet film thickness. However, the current models of unsteady inlet film thickness lack unsteady disturbance factors and do not take surface topography into consideration. In this paper, based on the hydrodynamic analysis of inlet zone an unsteady rolling film model which concerns the direction of surface topography is built up. Considering the small fluctuation of inlet angle, absolute reduction, reduction ratio, inlet strip thickness and roll radius as the input variables and the fluctuation of inlet film thickness as the output variable, the non-linear relationship between the input and output is discussed. The discussion results show that there is 180° phase difference between the inlet film thickness and the input variables, such as the fluctuant absolute reduction, the fluctuant reduction ratio and non-uniform inlet strip thickness, but there is no phase difference between unsteady roll radius and the output. The inlet angle, the steady roll radius and the direction of surface topography have significant influence on the fluctuant amplitude of unsteady inlet film thickness. This study proposes an analysis method for unsteady inlet film thickness which takes surface topography and new disturbance factors into consideration.

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Author information

Authors and Affiliations

  1. School of Mechanical Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    Kuo Fu, Yong Zang, Zhiying Gao, Qin Qin & Diping Wu

Authors
  1. Kuo Fu
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  2. Yong Zang
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  3. Zhiying Gao
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  4. Qin Qin
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  5. Diping Wu
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Corresponding author

Correspondence to Yong Zang.

Additional information

Supported by National Natural Science Foundation of China (Grant No. 51175035), PhD Program Foundation of Ministry of Education of China (Grant No. 20100006110024), and Beijing Higher Education Young Elite Teacher Project of China (Grant No. YETP0367)

FU Kuo, born in1986, is currently a PhD candidate at School of Mechanical Engineering, University of Science and Technology Beijing, China. He received his bachelor degree from Taiyuan University of Science and Technology, China, in 2009. His research interests include unsteady rolling process and rolling lubrication.

ZANG Yong, born in 1963, is currently a professor and a PhD candidate supervisor at School of Mechanical Engineering, University of Science and Technology Beijing, China. His research interests include analysis and control of mechanical behavior of industry equipment.

GAO Zhiying, born in 1979, is currently an associate professor at School of Mechanical Engineering, University of Science and Technology Beijing, China. Her research interests include mill vibration and nonlinear vibration analysis.

QIN Qin, born in 1970, is currently an associate professor at School of Mechanical Engineering, University of Science and Technology Beijing, China. His research interests include simulation and control behavior of industrial machinery.

WU Diping, born in 1972, is currently an associate professor at School of Mechanical Engineering, University of Science and Technology Beijing, China. His research interests include computer simulation and field test.

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Fu, K., Zang, Y., Gao, Z. et al. Non-linear dynamics of inlet film thickness during unsteady rolling process. Chin. J. Mech. Eng. 29, 522–530 (2016). https://doi.org/10.3901/CJME.2016.0118.010

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  • DOI: https://doi.org/10.3901/CJME.2016.0118.010

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