A simple analysis for the lubrication of saw-tooth surfaces with longitudinal lay under conditions of high fractional contact area is developed. This is then coupled with Wilson and Sheu’s asperity flattening model to treat the mixed lubrication of a bulk metal forming process (rolling). It is shown that, even under low speed conditions where the inlet zone does not generate significant hydrodynamic pressures, relatively high hydrodynamic pressures can be generated in the work zone. This explains the persistence of hydrodynamic effects noted in low speed experiments.

1.
Korzekwa
D. A.
,
Dawson
P. R.
, and
Wilson
W. R. D.
,
1992
, “
Surface Asperity Deformation During Sheet Forming
,”
Int. J. Mech. Sci.
, Vol.
34
, No.
7
, pp.
521
539
.
2.
Lo
S. W.
,
1994
, “
A Study on Flow Phenomena in Mixed lubrication Regime by Porous Media Model
,”
ASME JOURNAL OF TRIBOLOGY
, Vol.
116
, pp.
640
647
.
3.
Patir
N.
, and
Cheng
H. S.
,
1978
, “
An Average Flow Model for Determining Effects of Three-Dimensional Roughness on Partial Hydrodynamic Lubrication
,”
ASME JOURNAL OF LUBRICATION TECHNOLOGY
, Vol.
100
, No.
1
, pp.
12
17
.
4.
Patir
N.
, and
Cheng
H. S.
,
1979
, “
An Application of Average Flow Model to Lubrication Between Rough Sliding Surfaces
,”
ASME JOURNAL OF LUBRICATION TECHNOLOGY
, Vol.
101
, No.
2
, pp.
220
230
.
5.
Sa
C-Y.
, and
Wilson
W. R. D.
,
1994
, “
Full Film Lubrication of Strip Rolling
,”
ASME JOURNAL OF TRIBOLOGY
, Vol.
116
, pp.
569
576
.
6.
Sheu
S.
, and
Wilson
W. R. D.
,
1993
, “
Mixed Lubrication of Strip Rolling
,”
STLE Trans.
, Vol.
37
, pp.
483
493
.
7.
Sutcliffe
M. P. F.
,
1988
, “
Surface Asperity Deformation in Metal Forming Processes
,”
Int. J. Mech. Sci.
, Vol.
30
, No.
11
, pp.
847
868
.
8.
Sutcliffe
M. P. F.
, and
Johnson
K. L.
,
1990
, “
Lubrication in Cold Strip Rolling in the “Mixed” Regime
,”
Proc. I. Mech. E.
, Vol.
204
, pp.
249
261
.
9.
Tabary, P. E., Sutcliffe, M. P. F., Porral, F., and Deneuville, P., 1994, “Measurements of Friction in Cold Metal Rolling,” Tribology in Manufacturing Processes, Dohda, K., Jahanmir, S., and Wilson, W. R. D., eds, ASME, New York, pp. 169–182.
10.
Wilson, W. R. D., 1978, “Friction and Lubrication in Sheet Metal Forming,” Mechanics of Sheet Metal Forming, Plenum Press, New York, pp. 157–177.
11.
Wilson
W. R. D.
,
1979
, “
Friction and Lubrication in Bulk Metal Forming Processes
,”
J. of Appl. Metalworking
, Vol.
1
, pp.
1
19
.
12.
Wilson
W. R. D.
,
1990
, “
Mixed Lubrication in Metal Forming
,”
Advanced Technology of Plasticity
(Japanese Society of Technical Plasticity), Vol.
4
, pp.
1667
1676
.
13.
Wilson
W. R. D.
,
1991
, “
Friction Models for Metal Forming in the Boundary Lubrication Regime
,”
ASME Journal of Engineering Materials and Technology
, Vol.
113
, pp.
60
68
.
14.
Wilson, W. R. D., and Marsault, N., 1995, “Partial Hydrodynamic Lubrication With Large Fractional Contact Areas,” Manufacturing Science and Engineering, (MED-Vol 2.2/MH-Vol 3.2) Kannatey-Asiln, E. ed., ASME, New York, pp. 1187–1192.
15.
Wilson, W. R. D., and Schmid, S. R., 1992, “Surfaces in Metal Rolling,” PED-Vol. 62, Engineered Surfaces, ASME, pp. 91–100.
16.
Wilson, W. R. D., and Sheu, S., 1983, “Flattening of Workpiece Surface Asperities in Metalforming,” Proc. NAMRC XI, SME, pp. 172–178.
17.
Wilson
W. R. D.
, and
Sheu
S.
,
1988
, “
Real Area of Contact and Boundary Friction in Metal Forming
,”
Int. J. of Mechanical Sci.
, Vol.
30
, No.
7
, pp.
475
489
.
This content is only available via PDF.
You do not currently have access to this content.