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Research Papers: Elastohydrodynamic Lubrication

Partial Film Lubrication Characteristics of Inlet Zone in Cold Strip Rolling

[+] Author and Article Information
Kuo Fu

School of Mechanical Engineering,
University of Science and Technology Beijing,
Beijing 100083, China
e-mail: fukuosince1986@163.com

Yong Zang

School of Mechanical Engineering,
University of Science and Technology Beijing,
Beijing 100083, China
e-mail: yzang@ustb.edu.cn

Zhiying Gao

School of Mechanical Engineering,
University of Science and Technology Beijing,
Beijing 100083, China
e-mail: gaozhiying@me.ustb.edu.cn

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received September 30, 2013; final manuscript received June 7, 2014; published online July 9, 2014. Assoc. Editor: Dong Zhu.

J. Tribol 136(4), 041502 (Jul 09, 2014) (8 pages) Paper No: TRIB-13-1203; doi: 10.1115/1.4027858 History: Received September 30, 2013; Revised June 07, 2014

According to the average flow Reynolds equation and rolling theory, a partial film lubrication model of inlet zone has been developed. The model mainly simulates and reflects the influence of surface topography on the inlet film thickness and inlet zone length. Based on the surface topography analysis, a method to judge the friction condition was proposed. All the calculation was conducted by a numerical method. The result shows that the transverse stripe increases the inlet film thickness and the inlet zone length, while the longitudinal stripe decreases them. The surface roughness will enhance this effect. The surface roughness and the stripe direction also have a significant influence on the contact area ratio and the distribution of stress and film thickness in work zone. Transverse stripe increases the lubricant film thickness and separates the roll and the sheet with a larger distance in work zone. It also decreases the contact area ratio, the pressure stress and friction stress of the work zone. Whereas longitudinal stripe decreases the film thickness and increases the contact area ratio, pressure stress and friction stress. The surface roughness increases the contact area ratio, pressure stress and friction stress.

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References

Figures

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Fig. 1

Schematic of roll gage with lubrication

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Fig. 2

Schematic of surface topography

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Fig. 3

Unit body of rolling sheet

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Fig. 8

Film thickness distribution of work zone at different surface pattern parameter

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Fig. 9

Effect of surface roughness and surface pattern parameter on the contact area ratio of work zone (a) surface pattern parameter and (b) surface roughness

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Fig. 10

Pressure stress distribution of work zone

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Fig. 7

Influence of surface roughness and surface pattern parameter on the inlet zone length

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Fig. 6

Film pressure of inlet zone

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Fig. 5

Influence of surface roughness and surface pattern parameter on the inlet film thickness

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Fig. 4

Inlet film thickness at different reduction ratio

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Fig. 11

Effect of surface pattern parameter on stress distribution of work zone (a) pressure stress and (b) friction stress

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Fig. 12

Effect of surface roughness on stress distribution of work zone (a) pressure stress and (b) friction stress

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