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Laser honing0 pages
Laser Honing
Gehring
Rising customer expectations
and future exhaust and emission
laws place extensive requirements
on the oil and fuel consumption of
gaseoline and diesel engines. The
laser honing developed by Gehring
has become an international stan-
dard. For both diesel and gaseoline
engines, the laser structuring of the
cylinder is currently applied in the
range of the upper piston rever-
sal point. The combination of laser
structuring and honing of cylinder
bore surfaces is known as laser
honing.
Objective of laser honing
In principle, the frictional forces
in the tribological system consiting
of piston ring and cylinder bore
are to be reduced. As a contributi-
on to the future viability of internal
combustion engines, laser honing
provides an opportunity to improve
exhaust emissions so that the future
exhaust limits such as Euro 5 and
Euro 6 are easier to achieve.
Principles of laser honing
The combined honing and laser
structuring of cylinder bore surfaces
is considered laser honing. During
this process the engine block first
undergoes the conventional rough
and intermediate honing step in
order to achieve the desired base
profile for the laser structuring.
Microscopic pockets, the engine-
specific laser structure, are created
into the cylinder bore surface by
means of a laser beam. The subse-
quent final steps, deburring and
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Process sequence for the laser structuring of cylinder bores
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finish honing, remove the melt
protrusions arising from the laser
processing to create an extremely
fine surface.
Cylinder bore after laser honing
Structure after laser honing
Structure after finishing work
"