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TIMKEN® Roll Neck Bearing (3): Protection
Source: Bearing network time: 2013-06-02
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Roller neck bearing protection <br> Roller neck bearings need to be removed and tested from the mill at regular intervals; thus maximizing the service life of the roller bearings. The frequency of bearing protection and protection should be adjusted according to the mill operating conditions; The normal protection frequency is three months at full load; most mills every six months; light mills every twelve months. Roller neck bearings should be differentiated after 1000 hours of initial operation. In operation, it is necessary to completely remove the bearing and view the oil seal together; if necessary, the oil seal should be completely replaced; if no abnormality is found; the second viewing distance can be extended; for example, after every 2000 hours of operation or longer. Each time the bearing is removed from the rolling mill After the bearing assembly, the orientation and bearing area of ​​the bearing in the rolling mill should be recorded.
1. The usual process of roll neck bearing protection:
1) Track the bearing orientation in the rolling mill and record it. Timken can supply the customer with the roll neck bearing protection service card; it can be used to record the bearing housing number; roll number; rack number; bearing orientation on the rolling mill; Data such as ring bearing area and rolling product tonnage and bearing operation hours. The card should be updated at any time and convenient for repair personnel; the bottom blank can record bearing measurement data and other test details.
2) Remove the bearing seat from the roll; remove the bearing from the bearing seat. Whether the bearing is removed from the bearing seat or the bearing is inspected, special lifting methods and things are required; Timken can supply the customer. Lifting things and special hoisting methods,
3) Clear the bearing. All the falling off, water, residual smoothing agent and any other dirt that will form the bearing's severe wear should be removed during the process of removing the bearing. The cleaning method and scavenger used to remove the bearing are based on the removal of the bearing scale. Or bearing number resolution; small bearings or a few bearings available with fire oil; mineral oil or other commercial solvents. For large bearings or many bearings; neutral oil with a viscosity of 22 cSt (or 100 SUS at 100 °F) at 40 ° C is removed Cleared in the box.
4) View the bearing; include the appearance view and minor repair. On the outer surface of the detachable roller or on the outer surface of the roller; if it is found to exhibit small shedding or cracking of the skin; usually use a sander to remove the metal and grind it off Light shedding surface margin.
5) Regularly check the degree of bearing wear; the bearing clearance can be measured by measuring the bearing clearance.
6) View and repair the bearing housing according to the requirements;
7) Put the bearing back into the bearing housing,
8) According to the demand; view and repair the roll neck,
9) Place the bearing housing with the bearing onto the roller.
2. Smoothness of the roll neck bearing:
1) Recommended smoothing agent characteristics: type of soap base: lithium complex; calcium sulfonate; composite aluminum or equivalent analogue,
Consistency: NLGI No. 1 or No. 2
Additives: preservatives and antioxidants, anti-extreme pressure EP increase agent (ASTM D2509 US standard test method);
According to Timken's “OK†load detection specification and outstanding water scouring ability base oil: solvent-based essence mineral oil or composition oil base oil viscosity: 320 ~ 460 cSt
Viscosity index: minimum is 80 maximum flow point, -10 °C
2) Recommended smooth grease type:
a. Timken Premium Mill Grease
b. Mobil Mobilith SHC 460
c. Fina Ceran HV
3) Recommended amount of smooth grease:
The filling amount of smooth grease; it is suitable to fill two-thirds or one-third of the space of the bearing and bearing housing; it is not excessively smooth. After each grinding roller, the recommended amount of grease is 1/5 of the initial amount. Smooth The replenishment cycle of the grease is related to the layout of the bearing, the rotational speed, the temperature and the environment; the user can adjust according to the operating environment of the practice; under reasonable means, the clean and smooth grease is always stored in the bearing.
4) When installing a new roll neck bearing; do not wash off the anti-rust grease coated on the new bearing; although the anti-rust grease can not be used as a smoothing agent; but it will not hinder the normal use of the bearing.
3. Registration and storage of roll neck bearings:
1) The inner and outer ring components of the bearing should be wrapped in plastic; the packaging of the bearing should be designed to meet the moisture and dust resistance requirements of the bearing.
2) In order to prevent the elliptical deformation of the inner and outer rings; the roller neck bearings should be placed horizontally; the bearings should be stored in the original packaging and placed in a boring place.
3) In dusty, humid environments; bearings are not allowed to be removed from the package and placed on pallets or open shelves,
4) All bearing installations should be hygienic and in excellent condition; the workbench installation area should be hygienic; it should not be installed next to the welding area and machining equipment; prevent debris and dirt from entering the bearing.
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|
SIZE
(inch)
|
Weight
(PPF)
|
length
|
Outside
Diameter
|
Calculated
Weight Wpe
|
Single
weight
|
Wall
Thichness
|
Grade
|
ommonly used
type buckle
|
Upset Ends,for
weld on Tool joints
|
|
m
|
In mm
|
Lb/ft kg/m
|
kg/each
|
In mm
|
|
2 3/8
|
6.65
|
9.5
|
2.375 60.3
|
6.27 9.33
|
114
|
0.28 7.11
|
E,X,G,S
|
NC26
|
EU
|
|
2 7/8
|
10.40
|
9.5
|
2.875 73.0
|
9.72 14.47
|
180
|
0.362 9.19
|
E,X,G,S
|
NC31
|
EU or IU
|
|
3 1/2
|
9.50
|
9.5
|
3.500 88.9
|
8.81 13.12
|
|
0.254 6.45
|
E
|
NC38
|
IU or EU
|
|
3 1/2
|
13.30
|
9.5
|
3.500 88.9
|
12.32 18.34
|
220
|
0.368 9.35
|
E,X,G,S
|
NC38
|
IU or EU
|
|
3 1/2
|
15.50
|
9.5
|
3.500 88.9
|
14.64 21.79
|
|
0.499 11.4
|
E
|
NC38
|
IU or EU
|
|
3 1/2
|
15.50
|
9.5
|
3.500 88.9
|
14.64 21.79
|
|
0.499 11.40
|
X,G,S
|
NC38
|
EU or IEU
|
|
4
|
14.00
|
9.5
|
4.000 101.6
|
12.95 19.27
|
|
0.330 8.38
|
E,X,G,S
|
|
IU or EU
|
|
4 1/2
|
13.75
|
9.5
|
4.500 114.3
|
12.25 18.23
|
|
0.271 6.88
|
E
|
|
IU or EU
|
|
4 1/2
|
16.60
|
9.5
|
4.500 114.3
|
15.00 22.32
|
270
|
0.337 8.56
|
E,X,G,S
|
NC46
|
IU or EU
|
|
4 1/2
|
20.00
|
9.5
|
4.500 114.3
|
18.71 27.84
|
|
0.430 10.92
|
E,X,G,S
|
NC46
|
EU or IU
|
|
5
|
16.25
|
9.5
|
5.000 127.0
|
14.88 22.16
|
|
0.296 7.52
|
X,G,S
|
|
IU
|
|
5
|
19.50
|
9.5
|
5.000 127.0
|
17.95 26.70
|
330
|
0.362 9.19
|
E
|
NC50
|
IEU
|
|
5
|
19.50
|
9.5
|
5.000 127.0
|
17.95 26.70
|
330
|
0.362 9.19
|
X,G,S
|
NC50
|
EU or IU
|
|
5
|
25.60
|
9.5
|
5.000 127.0
|
24.05 35.80
|
|
0.500 12.70
|
E
|
|
IEU
|
|
5
|
25.60
|
9.5
|
5.00 127.0
|
24.05 35.80
|
330
|
0.500 12.70
|
X,G,S
|
|
EU or IU
|
|
5 1/2
|
21.9
|
9.5
|
5.500 139.7
|
19.83 29.52
|
|
0.361 9.17
|
E,X,G,S
|
|
IEU
|
|
5 1/2
|
24.70
|
9.5
|
5.500 139.7
|
22.56 33.57
|
|
0.41 10.54
|
E,X,G,S
|
|
IEU
|
|
6 5/8
|
25.20
|
9.5
|
6.625 168.3
|
22.21 33.04
|
|
0.330 8.38
|
E,X,G,S
|
|
IEU
|
|
6 5/8
|
27.72
|
9.5
|
6.625 168.3
|
24.24 36.06
|
|
0.362 9.19
|
E,X,G,S
|
|
IEU
|
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