Development of Hydromechanical Deep Drawing Setup to Improve Formability of Canister Made of SS304

Abstract

eep drawing operations are crucial for metal forming operations and manufacturing. Obtaining a defect free final product with the desired mechanical properties is very important for fulfilling the customer expectations and market competitions.

Higher and higher demand for increasing drawing ratio minimizing the thickness variation and reducing the tooling cost of the Product leads to the new technology known as hydro mechanical deep drawing. The hydro mechanical deep drawing process is one of the special drawing processes in which the bottom of the sheet is supported with a bed of pressurized viscous fluid during the forming process. The punch deforms the sheet to its final shape by moving against a controlled pressurized fluid. In order to successfully obtain the final desired parts, it is necessary to study the influence of the forming parameters on the hydro formability.

In this study FE simulation of conventional deep drawing is carried out to find the effective tool design, (die and punch) and to identify the process parameters for successful deep drawing. A typical industrial component had been chosen as a case study. FE simulations were carried out for experiments validation of it. Effects of various parameters such as blank holding force, friction, die entry radius, punch nose radius, etc has been done. An experimental setup for hydro mechanical deep drawing of same component has been developed. Thinning of component with hydro mechanical deep drawing is found lesser than that with conventional deep drawing. Cylindricity along component depth is also found consistent and better as compared to conventional deep drawing.