Transcript Repair of a slewing bearing

Repair of a slewing bearing
Data:
Object
Concerned part
Diameter
Bearing clearance
Axial force
Bucket-wheel excavator
Slewing bearing
4371 mm
≤ 0,3 mm
700 t
Damaged area:
Slewing bearing between
upper structure and chassis
Problem:
Some areas of the bearing
showed damages outside
the acceptable tolerance
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Repair of a slewing bearing
Pre measurements showed differences up
to 1,6 mm
For the solution of this repair problem the
high performance repair material
MM-metal SS-steel 382
- a PolymerMetal® made by MultiMetall –
was chosen.
All concerned damaged areas were
prepared with shims.
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Repair of a slewing bearing
Arrangements
The upper structure was lifted with 4 hydraulic cylinders.
The new bearing was brought into position by hanging it under the upper
structure on 6 thread rods leaving 50 mm space underneath.
The required quantity of the PolymerMetal resulted from the clearance
between the shimms.
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Repair of a slewing bearing
Foam strip to avoid
MM-metal SS-steel
382 being pressed
out
The quantity and position
of the “lines” of MMmetal SS-steel 382 were
determined under
consideration of the
clearance to be filled up.
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Repair of a slewing bearing
The MM-metal
SS-steel 382
was thoroughly
applied above
the bearing
Bearing
housing
Shims
Technical
Data Sheets
MM-metal
SS-steel 382
&
Hardener green
Bearing
Chassis
5
Repair of a slewing bearing
After the application of MM-metal SS-steel 382 (liquid type) with
Hardener green.
8
Repair of a slewing bearing
Immediately after the
application the 4 hydraulic
cylinders were lowered stepby-step (cylinder per
cylinder), carefully watching
the pressure of each cylinder.
9
Repair of a slewing bearing
During lowering the bearing housing surplus escaping MM-metal SS-steel
382 was removed.
Afterwards the bolts were inserted.
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Repair of a slewing bearing
Operation of the cylinders took a (scheduled) period of 2 hours.
The pot life of MM-metal SS-steel 382 was extended by using the special
Hardener green (instead of the standard Hardener yellow).
To reduce the final curing time heat was applied by the use of welding mats
with a temperature control system (maximum temperature 45 °C) to avoid
an overheating of the bearing.
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PolymerMetall® made by MultiMetall
MultiMetall Germany invests for more than 30
years
in
polymer-metallic
material
technologies for the maintenance of metals
and alloys. In plants and constructions often
functional particularly important components
are exposed to stresses like break, tear,
corrosion, cavitation, chemical or thermal
demands.
Components treated with PolymerMetals can be preventatively protected
against above mentioned stresses. Furthermore MultiMetall’s cold repair
technology facilitates a gentle material treatment and a durable repair of
damaged parts.
MultiMetall
the MetalExistenceCompany®
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MultiMetall & Internet
Please feel free to visit our website! At www.polymermetal.com detailed
information on our products and their usage can be found.
Here are some screenshots of our website:
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Essential parts of this publication are based on the presentation and
information, kindly provided by EMHA technisch bureau b.v..
EMHA technisch bureau b.v. is our exclusive partner in the Netherlands, who
successfully carries out repairs by using our PolymerMetals for many years.
EMHA technisch bureau b.v.
P.O. Box 54
2980 AB Ridderkerk
Netherlands
MultiMetall
P.O. Box 12 02 64
41720 Viersen
Germany
Tel: +31-18 04 84 34 3
Fax: +31-18 04 18 58 1
[email protected]
www.emhabv.com
Tel: 0 21 62-97 00 9-0
Fax: 0 21 62-97 00 9-11
[email protected]
www.polymermetal.com
PolymerMetall® • MultiMetall® • Ceramium® • Molymetall® • Sealium® • XETEX®
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