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Determination of Heating Paths in Line Heating Process to Make a Specific Surface from the Initial Sheet Metal

Nekahi, Mohammad Mahdi | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 48543 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Asempour, Ahmad
  7. Abstract:
  8. Sheet Metals are widely used in different industries such as ship building and pressure vessels. One important subject in these industries is to create the desired sheets through line heating process. Designing the heating lines in order to get the desired shape with the sufficient accuracy has always been a concern for the engineers in this process. In this thesis, the Strain-Based Method in designing the heat lines for creating special surfaces is discussed. Two sets of surfaces were considered. The first one is 2D surfaces set such as cylindrical surfaces. The second set is 3D surfaces set. The examples of such surfaces are double-curved surfaces such as a pillow and a saddle shape. The saddle shape curves in two different directions and the pillow shape including two curves that are both in one direction. The heating paths of these three shapes were found by Strain-Based Method. For thermal conditions two neural networks were trained. The first one used the data that was available in the literature and was taught to laser heat source. To train the second one, in accordance with a flame source, simulation of line heating process in commercial software ANSYS was used. In this regard, close to 60 different situations in different powers and torch speeds were run. The simulation results was used to teach the neural network. Finally, to verify the thermal characteristics obtained for the cylindrical shape and the pillow shape, paths and thermal conditions obtained was passed on a flat sheet metal by simulation and the results were compared with the desired shapes. It was shown that the Strain-Based Method in determining the thermal paths is very practical
  9. Keywords:
  10. Line Heating ; Heating Paths Design ; Heating Condition ; Strain-Based Method

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