University of Twente Student Theses
The occurrence of viscous shear heating within the cold rolling process
Kampstra, L. (2024) The occurrence of viscous shear heating within the cold rolling process.
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| Abstract: | One of the steps within the steel-making process is cold rolling, where steel strips are reduced in thickness.A typical cold mill consists of multiple stands, each providing a reduction in strip thickness. To improve the process, the stands are lubricated with a lubrication oil. The contact between the strip and the work roll typically occurs in the mixed lubrication regime. Most friction models neglect viscous shear, as friction from asperity contact is significantly higher than that from lubrication. However, previous studies have shown that viscous shear can not be neglected. Viscous shear is the internal friction of fluid layers within the lubrication film. At very low shear rates, the lubricant behaves as a Newtonian fluid, but at more substantial shear rates the lubricant exhibits shear thinning which can be described by the Eyring model. At really high shear rates, the lubricant can experience thermal effects. Heat generation within the film causes the viscosity to decrease and consequently results in a reduction of the shear stress, also known as viscous shear heating. This thesis project investigates the occurrence of viscous shear heating in the cold rolling process and whether it should be incorporated into friction models. |
| Item Type: | Essay (Master) |
| Clients: | Tata Steel, Velson-Noord, Netherlands |
| Faculty: | ET: Engineering Technology |
| Subject: | 33 physics, 51 materials science, 52 mechanical engineering |
| Programme: | Mechanical Engineering MSc (60439) |
| Link to this item: | https://purl.utwente.nl/essays/100141 |
| Export this item as: | BibTeX EndNote HTML Citation Reference Manager |
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