MATHEMATICAL MODELING OF DRAWING STRESSES OF MAGNESIUM ALLOYS THROUGH HYDROFORMING DEEP DRAWING PROCESS USING HEAVY MACHINE OIL MEDIUM

Abstract

The advantages of sheet hydro forming are improving the material formability, reduction of friction force, the
accuracy of the forming part and the reduction of forming stages.The hydro formed components are used in the aerospace,
automotive and other industries. This paper presents mathematical modeling of drawing stresses of magnesium alloys in
hydroforming deep drawing process through heavy machine oil medium. An additional element such as fluid pressure is to be
contributes positively in several ways in this process. In hydro forming deep drawing process, the methodology for applying
the hydraulic pressure on blank periphery in radial direction. It is obtained through the punch movement within the fluid
chamber, which is provided in punch and die chambers. These two chambers are connect ed with the bypass path and it is
provided in the die. During the process punch movement within the fluid chamber the pressure is generated in fluid and it is
directed through the bypass path to blank periphery, the fluid film is created on the upper and l ower surfaces of the blank
and subsequently reduces frictional resistance and is to reduce tensile stresses acting on the wall of the semi drawn blank.
The blank is taking at centre place in between blank holder and die surface with supporting of high pressurized viscous fluid.
The drawing stresses are produced in the cup wall at die entrance radius along the drawing direction during the formation
cup in this process with help of punch force , the shear stresses acted by viscous fluid on the both sides of blank, so apply
viscosity phenomenon to this analysis. The blank holder pressure is controlled by the radial pressure of fluid . Drawing
stresses are evaluated in terms of process parameters, blank geometry, shear stress and viscosity of heavy machine oil
through mathematical modeling.