SKF_NoWear Presentation @ 07-12-06
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Transcript of SKF_NoWear Presentation @ 07-12-06
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October 30, 2007 SKF Group Slide 0
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NoWear
Presented to name/s
Presented by name of presenter
Yyyy-mm-dd
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October 30, 2007 SKF Group Slide 2
Presentationoutline
What is NoWear? Why use NoWear?
Material properties / Application triggers
Suffixes
Application examples
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October 30, 2007 SKF Group Slide 3
What is NoWear?
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October 30, 2007 SKF Group Slide 4
NoWea Improved service life througsurface engineering
Eliminates or reduces wear when having:
Poor lubrication
Unfavourable load/speed situation (smearing)
Standstill vibrations (false brinelling)
Contamination (abresive wear)
Increased life in demandingapplications!
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October 30, 2007 SKF Group Slide 5
What isNoWear?
Metal- Containing Hydrogenated Amorphous Carbon CoatingThickness 0,3 - 6 m depending on component size and geometry
Adhesion
Function
Run-in
Adhesion layerdesigned by SKF
Function layerWC- lamellas
Run- in layer
basically graphite
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October 30, 2007 SKF Group Slide 6
Why use NoWear?
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October 30, 2007 SKF Group Slide 7
Why use NoWear?
Caused by Lack of cleanliness before and during mounting operation Ineffective seals
contaminated Lubricant
Consequences Indentations on the raceway/rolling elements Dull, worn surfaces Grease discoloured green
NoWear - Abrasive wear reduction
Earlier bearing
failure
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October 30, 2007 SKF Group Slide 8
Particles after 8 days
1,E+01
1,E+02
1,E+03
1,E+04
1,E+05
1,E+06
>5 um > 15 um
Particle size
Start
Standard
NoWear
WhyuseNoWear? Abrasivewear
Testing setup bearing SKF 29412E Load C/P = 5
Speed 6 r/min
Filtering every 24h
1,E+02
1,E+03
1,E+04
1,E+05
0 24 48 72 96 120 144 168 192
Running time (h)
No.ofpar
ticles>5um/25mloil
Std NoWear
No external particles
In- line part icle counting
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October 30, 2007 SKF Group Slide 9
Why use NoWear?
FT
Metal to metal contact
High temperature in the contact
Local micro welding
Material transfer
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October 30, 2007 SKF Group Slide 10
NoWear prolongs
NoWear prolongs bearing life because of:No metal- to-metal contact
Specially developed and adopted for rolling contact
Solid lubrication (graphitisation)
Higher surface hardness
NoWear is not intended to improve:
Subsurface fatigue
Electrical insulation
Load rating Corrosion resistance
or if there is perfect lubrication film at all times
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October 30, 2007 SKF Group Slide 11
Material properties /
Application triggers
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October 30, 2007 SKF Group Slide 12
Material properties
NoWear in relation to normal bearing steel surface
DRY
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October 30, 2007 SKF Group Slide 13
Applicationtriggers
Typically used in running situations with: Unfavourable load & speed situation
Standstill vibrations or applications with sliding or small relative motion
Thin lubrication film (boundary lubrication) in combination with some sliding
which may results in surface damages like:
Adhesive wear (smearing)
False brinelling
Abrasive wear
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October 30, 2007 SKF Group Slide 14
NoWear - Wear rate
0
0,2
0,4
0,6
0,8
1
1,2
Steel NoWear
Test setup
Fixed steel ball
Coated/uncoated plate
Dry
Pressurized
Wear Volume Ball(normalised to steel and measured after 2000 cycles)
Seizure at 2000 cyclesNo seizure after 250 000
additional cycles
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October 30, 2007 SKF Group Slide 15
Smearing resistance
22222 E/C3 bearing, suddenly applied load => rapid acceleration
Steel
Black oxid
NoWear
max.ndm
0
100.000
200.000
300.000
400.000
500.000
600.000
700.000
800.000
Steel Black oxid NoWear
Failure Failure
Suspended
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October 30, 2007 SKF Group Slide 16
Fafnir test NoWear vs. steel
Oscillation +/- 6
0,0
2,0
4,0
6,0
8,0
10,0
12,0
14,0
16,0
18,0
Steel NoWear balls NoWear balls&rings
Averagewear
loss[mg]
Result acc. to ASTM D4170 Avg. Loss cage & balls Avg. Loss ring
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October 30, 2007 SKF Group Slide 17
Wear depthafter800.000 revolutions
Standard
NoWear
NoWear
- - - Standard
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October 30, 2007 SKF Group Slide 18
Suffixes
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October 30, 2007 SKF Group Slide 19
NoWear - Suffixes
The most common execution for NoWear bearings, used in95%of the cases:
L5DA coated rolling elements
Other configurations:
L1DA coated inner r ing RW and outer ring RW
L3DA coated inner r ing RW
L4DA coated inner ring RW, outer r ing RW + rolling elements
L6DA coated rolling elements and outer ring RW
L7DA coated rolling elements and inner ring RW
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October 30, 2007 SKF Group Slide 20
Application examples
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October 30, 2007 SKF Group Slide 21
Application examples - Overview
Pulp & Paper Calenders
Suction box Super Coater
Winder roll
Pulp refiner
Dryer section
Metal working Gearbox
Slab grinderspindles
Backing bearing
Marine Pods
Electric motors Shaft generators
Gearboxes
Waterjets
Swing bridge Industrial Fans Gear wheels
Formula 1
Wind turbines Gearboxes
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October 30, 2007 SKF Group Slide 22
Heavy movable structures
Third Avenue Bridge, New York NoWear for operation reliabilityunder marginal lubrication.Reduced friction of sliding rollingelements.
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October 30, 2007 SKF Group Slide 23
Marine environment
Customer comments:"NoWear is an upgrade forthruster motors, which enables
increased MTBF (mean timebetween failure) and is especiallywell suited for the marineenvironment.
Ship applications Gearboxes
Pods
Electrical thruster motors
Shaft generators
NoWearFor reliability and prolongedservice life under false brinelling,
low kappa and smearingconditions.
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October 30, 2007 SKF Group Slide 24
KOUN Marine CO., LTD
KOUN Marine CO., LtdIntermediate shaft between refrigerationcompressor and electric motor
Solution SKF NoWear DGBB
Benefits Customer
Four times longer service life
Reduced maintenance costs
Reliable running between planned overhauls
SKF Clear recognition of SKF as the Knowledge
Engineering Company
Liquid ethylene chemical tanker
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October 30, 2007 SKF Group Slide 25
Hansen Transmission
Hansen Transmission Int. (Belgium)2 & 3 MW windmill turbine gear units
Solution
SKF NoWear cylindrical roller bearing
Benefits Customer
Improved service life
Avoid damages at low load
SKF
Clear recognition of SKF as the KnowledgeEngineering Company
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October 30, 2007 SKF Group Slide 26