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Characteristics of unsteady lubrication film in metal-forming process with dynamic roll gap

Journal Article


Abstract


  • Based on the theory of unsteady hydrodynamic lubrication and relevant mathematic and physical methods, a basic model was developed to analyze the unsteady lubrication film thickness, pressure stress and friction stress in the work zone in strip rolling. The distribution of pressure stress and friction stress in the work zone was obtained. A numerical simulation was made on a 1850 cold rolling mill. The influence of back tension stress and reduction on the distribution of pressure stress and friction stress between the roll gaps was qualitatively analyzed by numerical simulation. The calculated results indicate that the higher the back tension, the lower the pressure stress and the friction stress in the work zone, and the largest friction stresses are obtained at the inlet and outlet edges. The pressure and friction gradients are rather small at high back tension. The pressure-sensitive lubricant viscosity increases exponentially with the increase of pressure. The unsteady lubrication phenomenon in the roll bite is successfully demonstrated.

Authors


  •   Wang, Qiaoyi (external author)
  •   Zhang, Ze (external author)
  •   Chen, Hui-Qin (external author)
  •   Guo, Shan (external author)
  •   Zhao, Jingwei

Publication Date


  • 2014

Citation


  • Wang, Q., Zhang, Z., Chen, H., Guo, S. & Zhao, J. (2014). Characteristics of unsteady lubrication film in metal-forming process with dynamic roll gap. Journal of Central South University, 21 (10), 3787-3792.

Scopus Eid


  • 2-s2.0-84910146222

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/3264

Number Of Pages


  • 5

Start Page


  • 3787

End Page


  • 3792

Volume


  • 21

Issue


  • 10

Abstract


  • Based on the theory of unsteady hydrodynamic lubrication and relevant mathematic and physical methods, a basic model was developed to analyze the unsteady lubrication film thickness, pressure stress and friction stress in the work zone in strip rolling. The distribution of pressure stress and friction stress in the work zone was obtained. A numerical simulation was made on a 1850 cold rolling mill. The influence of back tension stress and reduction on the distribution of pressure stress and friction stress between the roll gaps was qualitatively analyzed by numerical simulation. The calculated results indicate that the higher the back tension, the lower the pressure stress and the friction stress in the work zone, and the largest friction stresses are obtained at the inlet and outlet edges. The pressure and friction gradients are rather small at high back tension. The pressure-sensitive lubricant viscosity increases exponentially with the increase of pressure. The unsteady lubrication phenomenon in the roll bite is successfully demonstrated.

Authors


  •   Wang, Qiaoyi (external author)
  •   Zhang, Ze (external author)
  •   Chen, Hui-Qin (external author)
  •   Guo, Shan (external author)
  •   Zhao, Jingwei

Publication Date


  • 2014

Citation


  • Wang, Q., Zhang, Z., Chen, H., Guo, S. & Zhao, J. (2014). Characteristics of unsteady lubrication film in metal-forming process with dynamic roll gap. Journal of Central South University, 21 (10), 3787-3792.

Scopus Eid


  • 2-s2.0-84910146222

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/3264

Number Of Pages


  • 5

Start Page


  • 3787

End Page


  • 3792

Volume


  • 21

Issue


  • 10