Title: Numerical prediction of limiting draw ratio and thickness variation in hydromechanical deep drawing

Authors: Swadesh Kumar Singh, D. Ravi Kumar

Addresses: Department of Mechanical Engineering Indian Institute of Technology Delhi, New Delhi-16, India. ' Department of Mechanical Engineering Indian Institute of Technology Delhi, New Delhi-16, India

Abstract: Hydromechanical deep drawing is a process for producing cup shaped parts with the assistance of a pressurised fluid. In the present work, a complete experimental set up has been designed and fabricated to conduct hydromechanical deep drawing on a 315 tonne hydraulic press. Limiting draw ratio has been determined by using blanks of various diameters. The process was simulated using explicit finite element code LSDYNA. A comparison was made between simulated and experimental results of conventional and hydromechanical deep drawing using low carbon steel sheets of extra-deep drawing grade of 0.96mm thickness. The simulated results showed reasonable agreement with the experimental data. It was found that by hydromechanical deep drawing higher drawability and more uniform thickness distribution could be obtained when compared to conventional deep drawing.

Keywords: hydromechanical deep drawing; drawability; limiting draw ratio; prebulging; simulation.

DOI: 10.1504/IJMPT.2004.004746

International Journal of Materials and Product Technology, 2004 Vol.21 No.1/2/3, pp.106 - 123

Published online: 14 Jun 2004 *

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