Comparison of forming conical parts by hydroforming and conventional deep drawing processes

Abstract

Forming conical parts is one of the complex and difficult fields in sheet metal forming processes. These parts are normally formed in industry by processes such as spinning, explosive forming or multistage deep drawing. Hydroforming deep drawing is one of the special deep drawing processes which have been introduced in order to overcome some inherent problems in the conventional deep drawing with rigid tools. In the present work, an experimental program has been carried out to form and compare the forming pure copper conical‐cylindrical cups by hydroforming and conventional multistage deep drawing processes with some considerations in design of die set which improved forming conical parts by multistage dies. The results of the study demonstrate that surface quality of the drawn conical parts using hydroforming process is much better than the parts formed using the conventional deep drawing process. Thickness distribution curves are close together in critical regions.