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BEARINGS INSTALLATION |
Bushes
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d≤55mm
1. Pressing-in arbor
2. Bushes
3. Housing
4. Shoulder diameter
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In
most cases, UNAT slide bearing are used with a pressfit in
the same manner as general sleeve bearings. Fit the bearings
into housings using mandrels or press. In case of a
relatively large interference, provide both the I.D. Of the
housing and the O.D. Of bearing with chamfers, and fit the
bearing into the housing with mandrel for easy installation.
When using plastic bearing in an environment where
temperature fluctuates, install the bearing using set
screws, keys or flange pins for better results.
For some special application like UNAT bushes for injection
molding machines, can be used shrink fitting. This is the
preferred method of inserting a bush in its housing and
provides the optimum interference fit without risking
bearing damage during press fitting. Forzen carbon
dioxide(co2) should be packed around the bearing for up to 2
hours, depending on the cross section of bush to be cooled.
Once removed from the co2, the bush should be offered to its
housing without delay. It should fit without force, gravity
will usually be adequate for a vertical installation. |
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d≥55mm
1. Pressing-in arbor
2. Bushes
3. Housing
4. Shoulder diameter
5. Auxiliary ring
6. O ring
| d2mm |
dHmm |
| 50<d2≤100 |
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| 100<d2≤200 |
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| 200<d2≤305 |
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At the on-start of operation, contact
surfaces of shaft and bearings are smooth, however,
microscopic irregularities are inevitable to develop
after continued use. A deviation from true center
alignment may also exist. Thus, the initial contact
between sliding surface could be local. Do not
immediately start a regular loaded operation, it may
result in damaging the gearing surface, leading to a
shorter service life. Instead, gradually break-in
operations so to smooth out the microscopic
irregularities, and allow the entire pressure support
area to slowly come in contact without causing damage.
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Storage
UNAT slide bearings are supplied
packed in boxes or in a bag in a box. The bearings should be
stored in clean, rust proof manner. The thin wall bearings
like EP should be protected from deformation during storage.
Do not store in locations exposed to high temperatures, high
humidity, or the direct rays of the sun, and do not place
under a heavy load also.
Initial operation |
Thrust washers and plate
We recommended to provide housing
with hollowed dents for installing thrust washers and
sliding plates. Dowel pins should be applied to prevent
turning. |
1.
Dowel pin application(thrust washer)
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2.
Inlaid installation(plate)
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3.
Flat head screw application
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Alternative fixing methods
Laser welding, adhesive fixing or
soft soldering have also been used for economical
alternative fixing if the interference fit on the bush is
not sufficient or it is uneconomical to use dowel pins or
screws for trust washer and plate. When using laser welding
or other higher temperature manners should be considering
not exceed the max. slide layer temp. Can be bear. The
sliding layer must always be kept free from adhesives.
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