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Honing is the
application of bonded abrasive sticks, held on the outside or
inside of a honing tool to a surface for the purpose of
limited stock removal and to obtain a suitable surface finish.
The honing tool rotates continuously in one direction and
simultaneously reciprocates axially. Feed-out /feed in is
accomplished by periodical expansion of the sticks in
machining internal surfaces or periodical compression of the
sticks (bringing them closer together ) in machining external
surfaces, for each full stroke of the honing tool.
From 100 to 1000
times more abrasive grains participate in the cutting process
honing than in grinding: the cutting speed is only 1/50 to
1/120 of the wheel speed. The pressure of the abrasive tool on
the surface being honed is only from 1/6 to 1/10 of that in
grinding, and is within 2 to 9 kg per sq cm (usually 2 to 6 kg
per sq cm). The low cutting speed in honing and the
comparatively low pressure provide for a relatively low
temperature in the cutting zone. This enables a better surface
to be obtained.
Honing is applicable in a wide size range; holes of a diameter
as small as 3mm and as large as 1000mm can be successfully
honed.
General
Honing is a process for the removal of chips by abrasion.
Honing is used primarily for the machining of bores, but also
to process plane surfaces, shafts or asymmetrical bores.
Honing can be used to process virtually all industrially used
materials. The bores can range from 4 to 300mm in diameter and
up to 24m in length. The unit used to evaluate precision
honing is an “ is corresponds to 600th of the thickness of a
human hair.
Basics
During honing it is important to remember that the
construction and function of the work piece, which is to be
honed, will determine the dimensions of the honing tool and
the honing stone. It is particularly important to achieve an
optimal match between honing –stone lengths and bore length.
Here again customer can benefit from ABHI’s many years of
experience in this field.
Why use honing
Simple, low-cost and quick machining of bores of all materials
Low –cost alternative to internal grinding
Guaranteed geometric accuracy of the bore dimensions ( )
Produces any surface finish desired ( )
Rapid abrasion of the material with low machine cost.
What is honing?
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Honing is
defined as a cutting process with a multi-edge tool of
bonded grain, under constant surface contact between
component and tool.
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It achieves
improvement in the size: shape and surface finish of
pre-machined components.
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The rotating
honing tool also caries out longitudinal movement, with a
permanent change of direction.
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This means the
surface produced have a parallel crosshatch pattern.
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The honing
process also comprises the expansion of honing stones or
diamond ledges fitted onto the honing tool.
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This means the
material is cut steadily and the surface is smoothed over
the entire length of a bore.
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It is because of
the quality of finish that honing has been used as a
finishing method of piston bores in cylinder blocks by the
automotive industry for many years.
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Experience is
wide spread in the field.
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