An Isothermal Hydrodynamic Lubrication Theory for Hydrostatic Extrusion and Drawing Processes With Conical Dies

1971 ◽  
Vol 93 (1) ◽  
pp. 69-74 ◽  
Author(s):  
W. R. D. Wilson ◽  
J. A. Walowit
Keyword(s):  
Experimental Data ◽  
Hydrodynamic Lubrication ◽  
Lubrication Theory ◽  
Back Pressure ◽  
Hydrostatic Extrusion ◽  
Drawing Process ◽  
Uniform Deformation ◽  
Hydrodynamic Lubrication Theory ◽  
Lubrication Conditions ◽  
Good Agreement

A hydrodynamic lubrication theory is developed for a generalized hydrostatic extrusion and drawing process with augmentation and back pressure. The die is assumed to be conical and uniform deformation and isothermal lubrication conditions are assumed to exist. The theory is in good agreement with experimental data previously published by other workers.

A Thermal Hydrodynamic Lubrication Theory for Hydrostatic Extrusion of Low Strength Materials

1976 ◽  
Vol 98 (2) ◽  
pp. 335-342 ◽  
Author(s):  
R. W. Snidle ◽  
B. Parsons ◽  
D. Dowson
Keyword(s):  
Plastic Deformation ◽  
Theoretical Analysis ◽  
Thermal Effects ◽  
Hydrodynamic Lubrication ◽  
Extrusion Process ◽  
Lubrication Theory ◽  
Lubricant Film ◽  
Hydrostatic Extrusion ◽  
Solid Friction ◽  
Hydrodynamic Lubrication Theory

The paper presents a theoretical analysis of hydrodynamic lubrication in the hydrostatic extrusion process which includes a consideration of thermal effects in the lubricant film arising from the work of plastic deformation. A Newtonian lubricant with an exponential pressure-temperature-viscosity relationship has been assumed and allowance has been made for the effects of redundant deformation of the worked material. The results of the theory are compared with those from previous isothermal and solid friction theories.

A Comparison of the Frictional Losses in Hydrostatic and Conventional Extrusion Processes With Hydrodynamic Lubrication

1971 ◽  
Vol 93 (1) ◽  
pp. 75-78 ◽  
Author(s):  
W. R. D. Wilson
Keyword(s):  
Experimental Evidence ◽  
Hydrodynamic Lubrication ◽  
Lubrication Theory ◽  
Hydrostatic Extrusion ◽  
Frictional Losses ◽  
Conventional Process ◽  
Hydrodynamic Lubrication Theory ◽  
Favorable Conditions

Experimental evidence indicates that billet die friction is higher in conventional extrusion than in hydrostatic extrusion. Simple hydrodynamic lubrication theory is used to show that this may be accounted for by the less favorable conditions for hydrodynamic lubrication in the conventional process.

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