Investigations of Cooling Process and Edge Effects in Sheet Metal Forming by using the Line Heating Technique

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Shahidi, Ali | 2016

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 48544 (08)
University: Sharif University of Technology
Department: Mechanical Engineering
Advisor(s): Assempour, Ahmad
Abstract:
Sheet metals are widely used in different industries such as ship building and pressure vessels. In these industries, One important problem is Line Heating Forming. This method needs simple initial equipment and is economically advantageous.In this research heat transfer between gas torch and plate, cooling effects and edge effects are studied more precise. Impingement jet model is used to simulate effect of heat source (flame) and cooling air on plate. The temperature distribution in sheet metal due to the rates of cooling air and heated gas (flame) are calculated by using commercial engineering software, Fluent. Then, the computed temperature field by FLUENT is fed into the ANSYS FEM package for thermo elasto-plastic deformation analysis .The extracted results are compared and validated with published experimental tests. It is demonstrated that addition of cooling process can increase the sheet metal deformation up to 55%.Finally, on the study of the edge effects, it is shown that the deformation of plate edges is less than that in the midpoints. The results show that cooling process helps to reduce the deformation difference between the edge and midpoint
Keywords:
Line Heating ; Thermoelastic-Plastic ; Thermoelastic Analysis ; Air Cooling ; Impinging Jet ; Edge Effect

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