skf_nowear presentation @ 07-12-06

7/27/2019 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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Presentationoutline

What is NoWear? Why use NoWear?

Material properties / Application triggers

Suffixes

Application examples


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What is NoWear?


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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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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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Why use NoWear?


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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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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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Why use NoWear?

FT

Metal to metal contact

High temperature in the contact

Local micro welding

Material transfer


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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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Material properties /

Application triggers


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Material properties

NoWear in relation to normal bearing steel surface

DRY


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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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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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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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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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Wear depthafter800.000 revolutions

Standard

NoWear

NoWear

- - - Standard


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Suffixes


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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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Application examples


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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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Heavy movable structures

Third Avenue Bridge, New York NoWear for operation reliabilityunder marginal lubrication.Reduced friction of sliding rollingelements.


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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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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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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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skf_nowear presentation @ 07-12-06

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