The combining effect of changing forming path and heating effect during stretch forming process to enhance the formability of Al 6061 sheet

The main important point in the sheet metal forming process is to improve the formability of a sheet metal using different technology. Thus, a new way to improve formability of sheet metal via combining two effects increasing temperature with changing forming path, this new technique increases the limit strain of formability for sheet metals. The new method will open a new way to combining many effective parameters at the same process to increase the forming limit of sheet metals, which makes a new concept to improve the sheet formability. In this research the formability of AA 6061 sheet was determined and comparing with experimental for pervious researchers. The influence of thermal and changing forming path were achieved using M-K analysis and Hosford yield criteria.