ASME International
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Isothermal Elastohydrodynamic Lubrication of Point Contacts: Part III—Fully Flooded Results
ASME International - Tập 99 Số 2 - Trang 264-275 - 1977
Utilizing the theory developed by the authors in an earlier publication, the
influence of the ellipticity parameter, the dimensionless speed, load, and
material parameters on minimum film thickness was investigated. The ellipticity
parameter was varied from one (a ball on a plate configuration) to eight (a
configuration approaching a line contact). The dimensionless speed parameter was
varied over...
Hydrodynamic Lubrication of Hydrostatic Extrusion
ASME International - Tập 98 Số 1 - Trang 27-31 - 1976
An analytical model for the hydrodynamic lubrication of hydrostatic extrusion is
developed. This includes the effect of viscous heating on the film formation
process and the effect of viscous and plastic heating on the friction and film
thickness variation in the work zone. Theoretical predictions of film thickness
and extrusion pressure show good agreement with experimental measurements for
alumi...
An Isoviscous Model for the Hydrodynamic Lubrication of Plane Strain Forging Processes With Flat Dies
ASME International - Tập 96 Số 4 - Trang 539-546 - 1974
Transient isoviscous hydrodynamic theory is used to investigate the lubrication
of plane strain forging processes with flat dies. It is shown that during
yielding a film which decreases from a maximum thickness at the center of the
contact to zero at the edges is formed. As the deformation continues, the film
is transported outwards at half the surface speed of the workpiece. In the case
where the...
The Surface Deformation of Aluminum Compressed With Viscous Lubricants
ASME International - Tập 96 Số 4 - Trang 591-594 - 1974
The influences of lubricant viscosity and loading velocity on the surface finish
of plastically compressed 6061 aluminum alloy cylinders were studied. Specimens
with polished end faces were subjected to compression between two flat, chromium
plated dies, with lubricants of a viscosity ranging from 42 cp to 1207 cp at 38
deg C. The deformed surfaces were studied under a scanning electron microscope...
A Hydrodynamic Lubrication Theory for Strip Rolling Including Thermal Effects
ASME International - Tập 97 Số 1 - Trang 4-12 - 1975
A model of hydrodynamically lubricated cold rolling including thermal and
pressure effects on the lubricant is developed in this paper. The hydrodynamic
film thickness is calculated as well as the work zone pressure and shear stress
distribution for several conditions assuming that the lubricant behaves as a
Newtonian fluid. Pressure measurements made with vapor-deposited thin-film
transducers on ...
Lubricant Flow in a Plastohydrodynamic Work Zone
ASME International - Tập 98 Số 1 - Trang 16-21 - 1976
An analysis of the lubricant flow in zones of plastic deformation is developed.
This includes the effects of different surface temperatures and shear heating
within the lubricant film. Thermal effects on the lubricant velocity and
temperature profile, traction and volume flow rate are described. The difference
in surface temperatures plays a dominant role in deciding the variation of
lubricant fil...
Workpiece Surface Roughening in a Hydrodynamically Lubricated Metal Forming Process
ASME International - Tập 99 Số 1 - Trang 10-14 - 1977
A mathematical model for the roughening of the workpiece in a hydrodynamically
lubricated metal forming process is developed. Roughening is assumed to result
from local variations in the workpiece flow strength. The results of the
analysis are compared with previous experimental measurements.
Analysis of the Lubricant Film Formation Process in Plane Strain Forging
ASME International - Tập 96 Số 4 - Trang 605-610 - 1974
A thermal Reynolds’ equation is developed for a lubricant with an exponential
viscosity-temperature variation. The equation is used to analyze the film
formation process in liquid lubricated plane strain forging. The effects of
temperature and pressure induced viscosity changes on the film formation process
are described.
Piston Ring Lubrication and Cylinder Bore Wear Analyses, Part II—Theory Verification
ASME International - Tập 96 Số 2 - Trang 258-266 - 1974
Based on the analytical method presented in the previous paper (Part I),
comparisons of predicted wear curves along the major and minor side-thrust sides
of the cylinder bore are made with the measured ones obtained from several truck
engines for various vehicle mileages. The agreement was found to be good. This
indicates the analytical model developed in Part I is relevant and suitable for
predic...
Piston Ring Lubrication and Cylinder Bore Wear Analysis, Part I—Theory
ASME International - Tập 96 Số 3 - Trang 305-313 - 1974
An analytical method developed for determining the bore wear pattern for a
reciprocating piston engine over a complete running cycle is presented. The
method includes the considerations of the hydrodynamic lubrication theory
between the ring and the cylinder bore wall, piston ring geometric and elastic
characteristics, blowby through the piston ring pack, minimum film thickness
permitting film lub...
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