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Minimization of the Exit-Curvature Profile in Asymmetric Extrusion Dies

Shah Mohammadi, Mohammad | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 45117 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Assempour, Ahmad
  7. Abstract:
  8. One of the most common processes in shaping profiles with various cross-sections (with parallel surfaces), is a direct extrusion process. Always in the process, minimize the extrusion pressure and reduce the output profile curvature form of the main goals of researchers. Minimize the extrusion pressure in the mold design using nonlinear, many relationships are presented. Also, to reduce the output profile curvature of the mold, extrusion molding is used mostly at the outlet of the bearing. The purpose of this research is suitable for bearing design eliminates the curvature of the final product is extrusion. In this study interior design templates and profiles bearing acts simultaneously on the deviation of the final product has been studied. Three templates with Bezier curves, and nonlinear internal structures of asymmetric T-shaped outlet sections with different eccentricity values were examined. For each of the templates, the proper bearing design and finite element simulation and physical modeling accuracy outcomes were examined. Firstly velocity field in terms of output sections respectively. Then, using a deviation function, the output format based on the velocity field curvature profiles obtained on different pages. Then provide a new methodology to determine the bearing and bearing in mind the velocity field obtained for each of them it was the design of a suitable bearing. The methodology presented in the bearing into the equations of lines, and then its value is determined in such a way that the output profile curvature in the lowest reach. At the end of the physical and finite element simulation was used to simulate the process. According to the results, the curvature of the final product using bearing design has significantly improved
  9. Keywords:
  10. Direct Extrusion ; Nonlinear Die ; Bezier Curve ; Extruded Profile Curvature ; Bearing Modeling

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