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Dissertation
Modeling of thermo-mechanical behavior of work rolls in steel rolling
Doctor of Philosophy (Ph.D.), Drexel University
Sep 1991
DOI:
https://doi.org/10.17918/00008685
Abstract
In the modern high-speed rolling mill, the severe thermal and mechanical loads in the work rolls have been identified as the critical factors in the problems of excessive roll wear or spalling. While thermal stress is induced by the large temperature gradient near the thin surface layer of the work roll, the mechanical stresses are caused by compressive forces both in the bite region and in the contact region of the work roll with the backup roll. These stresses frequently lead to local plastic deformation in the work roll, which will shorten roll life and affect rolled product quality. In this thesis, an integrated computer model has been developed for the investigation of thermo-mechanical behavior of work rolls in high speed strip rolling processes. Three numerical submodels are integrated for predicting complex phenomena associated with thermal-mechanical behavior in the rolling processes. Formulations of each submodel are presented, and examples, as well as results, are given to compare with existing solutions to demonstrate the feasibility and capability of the model developed. The first submodel, ROLLING, can be used to estimate the roll pressure, roll torque, deformation energy, and friction energy. The second submodel, RSTROL, can be used to evaluate the temperature distribution in both the roll and strip. The third submodel, EPTC, predicts the thermoelastic-plastic and/or contact stresses induced by the temperature and the roll-separation forces to the work roll. A typical condition of steel rolling is adopted to investigate the thermo-mechanical behavior of the work roll in rolling processes. The results show good agreements with available published data. This investigation not only demonstrates the capability of the model developed but also provides quantitative information to explain the roll spalling and the thermal crown behavior this will eventually lead to improve the roll life and the product shape quality.
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Details
- Title
- Modeling of thermo-mechanical behavior of work rolls in steel rolling
- Creators
- Fong-Han Lin
- Contributors
- Ampere A. Tseng (Advisor) - Drexel University, Drexel University (1970-)
- Awarding Institution
- Drexel University
- Degree Awarded
- Doctor of Philosophy (Ph.D.)
- Publisher
- Drexel University; Philadelphia, Pennsylvania
- Number of pages
- xiv, 281 pages
- Resource Type
- Dissertation
- Language
- English
- Academic Unit
- College of Engineering (1970-2026); Drexel University
- Other Identifier
- 991021889091404721