Investigation of a New Method for Sheet Deep Drawing Based on the Pressure of Magnetic Medium

Abstract

To improve the forming performance of the deep drawing and the uniformity of wall thickness and then to improve the whole sheet quality, this paper puts the magnetic intelligent materials into the die as a force transmission medium to play a flexible back pressure role in the sheet deep drawing process, and develops a special experimental setup. The magnetic field affects the rheological properties of magnetorheological fluid (MRF) in the sheet deep drawing process, which changes the stress state and the deformation behavior. The research which takes the 304 stainless steel sheet whose thickness is 0.8 mm as an experimental object shows that, the forming performance of the sheet drawn with the MRF can be significantly improved with the increase of magnetic field intensity. Compared with conventional deep drawing, when the electric current of the coil is 2 A, the forming height limit of the sheet in the deep drawing process based on the pressure of magnetic medium increases by 26.3%, and the whole uniformity of wall thickness is improved obviously, which can effectively inhibit the possibility of the wrinkling defect in the flange. Thus, the sheet deep drawing process based on the pressure of magnetic medium is a potential research direction that may achieve the major breakthrough and progress.