Refined analysis of thermal effects for the hydrodynamic lubrication

• Autorzy: Bhatt V. K.
• Konferencja: Second International Tribology Conference
• Języki publikacji: EN

Abstrakty

EN

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.

Słowa kluczowe

EN

forging; hydrodynamic lubrication; thermal effects; Peclet number

PL

hydrodynamika; kucie; efekt termiczny

• Wydawca: Oficyna Wydawnicza Uniwersytetu Zielonogórskiego
• Czasopismo: International Journal of Applied Mechanics and Engineering
• Rocznik: 2002
• Tom: Vol. 7, Spec. is
• Strony: 215--224
• Opis fizyczny: Bibliogr. 9 poz., rys., wykr.

Twórcy

autor

Bhatt V. K.

• Mechanical Engineering Department. M.S.G. Bundelkhand Institute of Engineering & Technology, Jhansi, INDIA

Bibliografia

• [1] Bhatt V.K. (1989): Theoretical Investigations on Fluid Behavior in Metal forming. - Ph. D. Thesis Faculty of Engineering, University of Allahabad, India.
• [2] Bhatt V.K. (2000): Thermal analysis of flow in the deformation phase of liquid lubricated plane strti forging. - ASME Journal of Tribology, vol.122, pp.746-751.
• [3] Bhatt V.K. and Sengupta D.K. (1996): Analysis of thermal effects in the yield phase lubricant film in plane strain forging. - ASME Journal of Tribology, vol. 118, pp.880-885.
• [4] Hoffman O. and Sachs G. (1993): Introduction to the Theory of Plasticity for Engineers. — McGraw Hill.
• [5] Kalpakjian S. (1970): Forging Lubrication in Metal Deformation Processes Friction and J.A. Schey, Marcel Dekker.
• [6] Mahdavian S.M. and Wilson W.R.D. ( 1976 ): Lubricant flow in a plastic hydrodynamic work Journal of Lubrication Technology, Trans., ASME, Series F, vol.98, No.l, pp.16-21.
• [7] Wilson W.R.D. (1974): An isoviscous model for the hydrodynamic lubrication of plane strain forging processes with flat dies. - ASME, Journal of Lubrication Technology, vol.96, pp.539-546.
• [8] Wilson W.R.D. and Mahdavian S.M. (1974): A Thermal Reynolds equation and its application in analysis of plastic hydrodynamic inlet zone. — ASME, Journal of Lubrication Technology, vol pp.572-578.
• [9] Wilson W.R.D. and Wong C.I. (1974): Analysis of the film formation process in plane strain forging ASME, Journal of Lubrication Technology, vol.96, pp.605-610.