Download - Lyon2007 Friction Wear Bore
-
7/29/2019 Lyon2007 Friction Wear Bore
1/17
Friction and Wear Bench Tests ofDifferent Engine Liner Surface Finishes
Eduardo Tomanik
MAHLE Brazil Tech Center
34th Leeds-Lyon Symposium on Tribology
2007
Tomanik E. Friction and wear bench tests of different engine liner surface finishes.
Tribology International 41 (2008) 10321038
-
7/29/2019 Lyon2007 Friction Wear Bore
2/17
2/20
2005200520052005----01010101----1864186418641864
Tribology International 41 (2008) 10321038
Index
1- Introduction
2- Studied Liner Finishes
3- Reciprocating Friction Tests
4- Reciprocating Wear Tests
5- Discussion and Conclusions
Friction and Wear Bench Tests of Different
Engine Liner Surface Finishes
-
7/29/2019 Lyon2007 Friction Wear Bore
3/17
3/20
2005200520052005----01010101----1864186418641864
Tribology International 41 (2008) 10321038
Smedley, Tian, Wong, 2004
INTRODUCTION
Different engine bore finishes have been investigated and introduced in productiondue to the potential of minimizing- Friction,- Wear,- Lube Oil Consumption
0.00
0.02
0.04
0.06
0.08
0.10
0.12
0 50 100 150 200 250 300 350 400
Speed (rpm)
ExperimentalFrictionCoef.
Plateau Honing
Slide Honing
Tomanik, 2006
-
7/29/2019 Lyon2007 Friction Wear Bore
4/17
4/20
2005200520052005----01010101----1864186418641864
Tribology International 41 (2008) 10321038
Index
1- Introduction
2- Studied Liner Finishes
3- Reciprocating Friction Tests
4- Reciprocating Wear Tests
5- Discussion and Conclusions
Friction and Wear Bench Tests of Different
Engine Liner Surface Finishes
-
7/29/2019 Lyon2007 Friction Wear Bore
5/17
5/20
2005200520052005----01010101----1864186418641864
Tribology International 41 (2008) 10321038
Studied Liner Finishes
0.280.320.200.18Non-Laser Region
2.000.380.170.93Laser 3mm
1.580.640.230.85Laser 1mm
0.600.600.660.41UV Laser
1.690.540.130.69Slide Rk 0.5-0.9
1.680.700.170.74Slide Rk 0.5-1.2
RvkRkRpkRq
-2.5
-2.0
-1.5
-1.0
-0.5
0.0
0.5
1.0
1.5
Slide 0.5-
1.2
Slide 0.5-
0.9
UV Laser Laser 1mm Laser 3mm Non-Laser
Region
Bearing
Rate(um)
Rpk
RkRvk
Roughness (m)
3 mm
HDD 131 mm, alloyed perlitic grey cast iron
-
7/29/2019 Lyon2007 Friction Wear Bore
6/17
6/20
2005200520052005----01010101----1864186418641864
Tribology International 41 (2008) 10321038
-2.5
-2.0
-1.5
-1.0
-0.5
0.0
0.5
1.0
1.5
Slide 0.5-
1.2
Slide 0.5-
0.9
UV Laser Laser 1mm Laser 3mm Non-Laser
Region
BearingRate(um)
Rpk
Rk
Rvk
Studied Liner Finishes
Slide
UV Laser Laser Non-Laser region
HDD 131 mm, alloyed perlitic grey cast iron
-
7/29/2019 Lyon2007 Friction Wear Bore
7/17
8/20
2005200520052005----01010101----1864186418641864
Tribology International 41 (2008) 10321038
Index
1- Introduction
2- Studied Liner Finishes
3- Reciprocating Friction Tests
4- Reciprocating Wear Tests
5- Discussion and Conclusions
Friction and Wear Bench Tests of Different
Engine Liner Surface Finishes
-
7/29/2019 Lyon2007 Friction Wear Bore
8/17
9/202005200520052005----01010101----1864186418641864
Tribology International 41 (2008) 10321038
2
5
.
4
m
m
S
t
r
o
k
e
l i n e r
L o a d
R i n g p i e c e
2
5
.
4
m
m
S
t
r
o
k
e
l i n e r
L o a d
R i n g p i e c e
Friction Tests 50 N
UMT Reciprocating Test, 10 mm strokeApplied load: 50, 100 N. Speed from 25 to 375 rpm
Flooded with SAE30 Texaco Regal oil
PVD 3mm top rings
0.00
0.02
0.04
0.06
0.08
0.10
0.12
0.14
0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0
Speed/Load
FrictionCoefficient
Slide 0.5-1.2
Slide 0.5-0.9UV Laser
Laser 1mm
Laser 3mm
Non-Laser Region
[rpm/N]
-
7/29/2019 Lyon2007 Friction Wear Bore
9/17
11/202005200520052005----01010101----1864186418641864
Tribology International 41 (2008) 10321038
Index
1- Introduction
2- Studied Liner Finishes
3- Reciprocating Friction Tests
4- Reciprocating Wear Tests
5- Discussion and Conclusions
Friction and Wear Bench Tests of Different
Engine Liner Surface Finishes
-
7/29/2019 Lyon2007 Friction Wear Bore
10/17
12/202005200520052005----01010101----1864186418641864
Tribology International 41 (2008) 10321038
UMT Reciprocating Test 4 hour test
P = 360 N (P= 12 MPa), 900 rpm
Flooded with SAE30 Texaco Regal oil doped with hard particles to accelerate ring wear
PVD top rings
Wear Tests Friction along Test
0.00
0.02
0.04
0.06
0.08
0.10
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
T(h)
FrictionCoef
Slide 0.5-1.2
Slide 0.5-0.9
UV Laser
Laser 1mm
Laser 3mm
Non-Laser region
-
7/29/2019 Lyon2007 Friction Wear Bore
11/17
13/202005200520052005----01010101----1864186418641864
Tribology International 41 (2008) 10321038
2
5
.
4
m
m
S
t
r
o
k
e
l i n e r
L o a d
R i n g p i e c e
2
5
.
4
m
m
S
t
r
o
k
e
l i n e r
L o a d
R i n g p i e c e
UMT Reciprocating Test 4 hour test
Flooded with SAE30 Texaco Regal oil doped with hard particles to accelerate ring wear
PVD top rings
Wear Tests Ring and Liner Wear
-4
-2
0
2
4
6
8
Slide 0.5-1.2 Slide 0.5-0.9 UV Laser Laser 1mm Laser 3mm Non-Laser
W
ear(um)
Wear (m)
Liner
Ring
Liner After Test
4m
2m
Ring
-
7/29/2019 Lyon2007 Friction Wear Bore
12/17
14/202005200520052005----01010101----1864186418641864
Tribology International 41 (2008) 10321038
Index
1- Introduction
2- Studied Liner Finishes
3- Reciprocating Friction Tests
4- Reciprocating Wear Tests
5- Discussion and Conclusions
Friction and Wear Bench Tests of Different
Engine Liner Surface Finishes
-
7/29/2019 Lyon2007 Friction Wear Bore
13/17
15/202005200520052005----01010101----1864186418641864
Tribology International 41 (2008) 10321038
-3.5
-3.0
-2.5
-2.0-1.5
-1.0
-0.5
0.0
0.5
1.0
1.5
Dep
th(um)
Slide PlateauRpk
Rk
Rvk
SH PH
Rq 0.43 1.00
Rpk 0.17 0.26
Rk 0.47 0.99
Rvk 1.37 1.79
ZS 0.33 0.72
0.25 0.40
13.1 12.5
(109) 35 28
Modelling
Greenwood surface parameters,summit asperity:
ZS mean height [m]
height standard deviation [m] mean radius [m] density [m-2]
zS
surface heightdistribution
summit height
distribution
LP = 1 bar
P = 1 barT = 30 C
b
h
Sp
LP = 1 bar
P = 1 barT = 30 C
b
h
Sp
MIT ring simulation adapted code
assumed fully flooded conditions
Profile and Surface parameters calculated from the experimentalpieces
dry friction coeff. assumed = 0.11
Patir & Cheng Flow Factors
HDD 128 mm, alloyed perlitic grey cast iron
-
7/29/2019 Lyon2007 Friction Wear Bore
14/17
16/202005200520052005----01010101----1864186418641864
Tribology International 41 (2008) 10321038
Ring profile is non-symmetric, friction varies with direction. Negative values are only due to the force sensor.
Experimental vs. Predicted Friction
Plateau Honing
-0.12
-0.10
-0.08
-0.06
-0.04
-0.020.00
0.02
0.04
0.06
0.08
0.10
0.12
0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0
Speed/Load
FrictionC
oefficient
Exp
Model
[rpm/N]
-
7/29/2019 Lyon2007 Friction Wear Bore
15/17
17/202005200520052005----01010101----1864186418641864
Tribology International 41 (2008) 10321038
Experimental vs. Predicted Friction
Slide Honing
Ring profile is non-symmetric, friction varies with direction. Negative values are only due to the force sensor.
-0.12-0.10
-0.08
-0.06
-0.04
-0.02
0.00
0.02
0.04
0.060.08
0.10
0.12
0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0
Speed/Load
FrictionCoefficient
Exp
Model
[rpm/N]
-
7/29/2019 Lyon2007 Friction Wear Bore
16/17
18/202005200520052005----01010101----1864186418641864
Tribology International 41 (2008) 10321038
Predicted Oil Film Thickness /Asperity Contact
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
-360 -180 0 180 360
Crank Angle (deg)
Plateau
Slide
Calculated Oil Film Thickness
Plateau
at 0.80 m
AC/A0 = 21 %
VOil/A0= 0.84 m
Slide
at 0.80 m
AC/A0 = 0.3 %
VOil/A0= 0.80 m
OilFilm(
m)
HDD engine, 1800 rpm, 25% load
Calculated Results show that the Smoother finishingpresents: lower asperity contact pressure lower friction & wear lower oil volumes potential for lower LOC
at 0.30 m
AC/A0 = 53 %
VOil/A0= 0.53 m
at 0.15 m
AC/A0 = 32 %
VOil/A0= 0.19 m
-
7/29/2019 Lyon2007 Friction Wear Bore
17/17
19/202005200520052005----01010101----1864186418641864
Tribology International 41 (2008) 10321038
Conclusions
-- With increase of speed, the smoother surfaces tend to enter first in hydrodynamicregime. The laser 3 mm and the smooth non-laser region showed significant lowerfriction. But only roughness can not explain the different friction.
-- In the wear tests, friction reduced along the test due the break-in. In general,friction along the wear test followed the friction test ranking.
-- Effect of surface finish was not significant on the measured liner wear. For thering wear, the smoother variants caused lower wear.
-- Under engine operation, the structured laser spots may combine the lower friction
advantage of the very smooth finish along the stroke and the oil reservoirs on thespotted region.