Manufacturing Technology Today

Swadesh Kumar Singh ¹, D. Ravi Kumar ¹

Affiliations
1 Department of Mechanical Engineering, Indian Institute of Technology Delhi, New Delhi-16, IN

Abstract

Hydro-mechanical deep drawing is a process for producing cup shaped parts with the assistance of a pressurized fluid. The development of hydro-mechanical deep drawing process is reviewed in this paper. Findings of different researchers and the applications of the process are described. A comparison is made between various counter-pressure processes. The advantages of the processes over conventional deep drawing are discussed. Design of hydro-mechanical deep drawing requires detailed considerations than that for the forming of components with conventional deep drawing. Analytical and Finite element simulations were conducted to find out the different features of tooling design for hydro-mechanical deep drawing.

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Swadesh Kumar Singh ¹, D. Ravi Kumar ¹

Affiliations
1 Department of Mechanical Engg., IIT Delhi, New Delhi, IN

Abstract

Hydraulic counter pressure deep drawing is a process for producing cup shaped parts with the assistance of a pressurized fluid. In the present work a complete experimental set up has been designed and fabricated to conduct hydro-mechanical deep drawing on a 315 tonne hydraulic press. A comparison was made between conventional and hydro-mechanical deep drawing using low carbon steel sheets (EDD grade) of 1.00 mm sheet thickness. Limiting draw ratio (LDR) has been determined experimentally by using blanks of various diameters. Effect of counter pressure on LDR was also studied. Pre-bulging height was also measured at different chamber pressures and LDR was theoretically predicted. It was found that by hydro-mechanical deep drawing higher drawabllity, more uniform thickness distribution and better surface finish were obtained when compared to conventional deep drawing.

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