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Analyzing of Ring Rolling Process

Zamani Kohpanji, Mohammad Reza | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 44651 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Asghari, Mohsen
  7. Abstract:
  8. With the development of science and industry increasingly need for seamless and high-strength rings, the attention of many researchers and industrialists paid on the ring rolling process. Then, Studying details of ring rolling process is very important. The most important issues in ring rolling process which are not sufficiently considered are: stress components distribution in ring, real amounts of friction coefficient, pressure distribution over the rollers, required power, required torque and force, and finally the minimum thickness of the ring during the process, all of these parameters have developed as analytical functions. In the present study, the minimum possible thickness of the ring in ring rolling process for single-stage and multi-stage rolling is presented. For this purpose, by using a velocity field which is adaptable to boundary ring conditions during the process, stress components distribution in ring in deformation zone was determined. Then, with the determined stress distribution,friction coefficient distribution, pressure distribution over the rollers, required power, required torque and force have been determined. Focusing on the stability of ring in the whole process we determined the maximum and minimum ring thickness in the entry zone, and maximum and minimum reduction in one rolling stage. Finally, using the related fracture mechanics theories, the maximum possible number of rolling process, the maximum percentage decrease in ring thickness and maximum residual strain before seaming (for multi stage rolling process) were determined based on the criterion of cracks initiation of the ring
  9. Keywords:
  10. Stress Distribution ; Ring Rolling Process ; Final Thickness Reduction ; Minimum Thickness ; Maximum Thickness

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