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Refined analysis of thermal effects for the hydrodynamic lubrication

Bhatt V. K.

International Journal of Applied Mechanics and Engineering

2002

Vol. 7, Spec. is

215-224

The behavior of hydrodynamic Newtonian lubricant film at the die-workpiece interface in plane strain forging, when the conduction and convection mode of heat transfer is taking place has been theoretically investigated. A complete analysis of plane strain forging process for the case when die extends beyond the workpiece is developed. Viscous shear in the film, friction between the tool and the workpiece and the energy released by the plastic deformation, all contribute to rise in the temperature of the film. As a result, thermal gradient is established and heat transfer takes place, also the physical properties of the fluid is effected due to temperature and pressure rise. An attempt is made in the present work to develop a more sophisticated mathematical model using thermal Reynold's equation developed by Bhatt and Sengupta (1996) and analysis developed by Bhatt (2000). Further equation of plastic equilibrium is solved with appropriate boundary conditions. From this solution mean die pressure for plane strain forging process have been obtained. The variation in mean die pressure with reduction at different Peclet numbers has been investigated. On the basis of this analysis, it can be concluded that mean die pressure decreases with increase in Peclet number. Some basic conclusions have been drawn and suggestions are given for future to enhance the utility of the results of these investigations.

Application of refined thermal Reynolds equation in the analysis of hydrodynamic lubrication of strip rolling

Bhatt V. K.

International Journal of Applied Mechanics and Engineering

2002

Vol. 7, no 4

1125-1139

A refined thermal Reynolds equation considering conduction and convection modes of heat transfer across the film for inlet zone of the liquid lubricated strip rolling, developed by Bhatt and Sengupta, is applied in this analysis. It is known that inlet zone plays a dominant role in fixing the lubricant film thickness in the work zone. Hence, for the present analysis the effect of conduction and convection across the film in the inlet zone is studied on the work zone as well as the effect of variation of convection effect in the form of variation of the Peclet number. It is observed that the roll separating force and torque decrease with increasing the Peclet number.