Amirkabir University of Technology Amirkabir Journal of Mechanical Engineering 2008-6032 41 1 2009 08 23 Comparing force and cup thickness variations in deep drawing of thick sheets in flat, conical and tractrix dies Comparing force and cup thickness variations in deep drawing of thick sheets in flat, conical and tractrix dies 59 65 257 10.22060/mej.2009.257 FA Mohammad Sedighi Mehdi Rasti Journal Article 2014 03 16 Deep drawing is one of the most important processes in manufacturing of CNG pressure vessel liner.<br />Due to the high thickness of initial blank, liner manufactures can use different types of dies such as<br />conical, tractrix and flat dies. In this paper, a sample of "type 3" aluminum liner has been selected and the<br />deep drawing process has been simulated by using finite-element method. Three types of dies behavior<br />have been compared for parameters such as the required drawing force and cup wall thickness variations.<br />Available experimental data was used to verify the numerical results. The results have shown that in a<br />tractrix die, the required drawing force will decrease, and minimum wall thickness variations can be<br />obtained. Deep drawing is one of the most important processes in manufacturing of CNG pressure vessel liner.<br />Due to the high thickness of initial blank, liner manufactures can use different types of dies such as<br />conical, tractrix and flat dies. In this paper, a sample of "type 3" aluminum liner has been selected and the<br />deep drawing process has been simulated by using finite-element method. Three types of dies behavior<br />have been compared for parameters such as the required drawing force and cup wall thickness variations.<br />Available experimental data was used to verify the numerical results. The results have shown that in a<br />tractrix die, the required drawing force will decrease, and minimum wall thickness variations can be<br />obtained. https://mej.aut.ac.ir/article_257_4ae14de567f7e1522fe31a8850b079de.pdf