Analysis of Hydrodynamic Fluid Lubrication in Strip Drawing Process at Inlet Zone

This paper deals to evaluate the effect of different parameters such as yield strength of work piece material, viscosity of lubricant, pressure coefficient of viscosity on lubricant film thickness, shear stress, pressure developed in lubricant film and temperature of the strip, lubricant film and die surface in strip drawing process. For this analysis taken rigid-plastic model different values of lubricant viscosity and pressure coefficient of viscosity and has analyzed the effect by changing one parameter on other parameters involved in strip drawing process. As a thick lubricant film would prevent contact between die and work piece and provide much friction between die and strip work piece on other hand if lubricant film is very thin then this would lead to die wear and cause inaccuracy/loss of surface finish in work piece as well as reduction in production. However these two requirements i.e. thick lubricant films and low friction do not generally occur together. A thick hydrodynamic film can be generated by using a highly viscous lubricant but comparatively lower viscous oil may be selected to generate a sufficiently thick hydrodynamic film to protect the surface. This present work help in selecting suitable lubricant for a particular work material.