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Bearing internal diameter greater than 70mm, or with interference when using heating the SKF bearings hole expansion, so installation and effort Province, but also to avoid injury due to excessive force.
Then the need to control the heating temperature, generally the bearing was heated to 80 ° C, 100 ° C maximum. Suffice. It will lead to more than 120 ℃ FAG Bearings the tempering phenomenon occurs, resulting ferrule hardness decreased with reduced accuracy. The commonly used method of heating:
1 electric hot plate heating
Bearing placed on the hot plate temperature of 100 ° C a few minutes, this method is most convenient, such as flip several times allows the bearing uniform heating efficiency, the size of NSK bearings can use the same method.
2 electric furnace heating
Bearings placed the closed automatic temperature electric furnace heating, heating uniformity, accurate temperature control, fast heating, suitable for a number of heating many occasions bearing.
3 induction heating method
The use of an induction heater can be quickly, reliably and cleanly TIMKEN bearings was heated to the desired temperature, which is particularly suited to the tight fit in the inner ring occasion, since only the inner ring to be heated, while the outer ring heated, so can be more easily mounted on the shaft, and can easily be stored in the seat hole.
4 light bulb heating
50W bulbs heating bearings, can ensure that the heating temperature of about 100 ℃, smaller bearings may be placed directly on the bulb, the larger bearing can be placed within the conical cap of the lamp, conical hood lamp can prevent heat loss, and uniform heating. Tapered hood can be adjusted under the bit, bearings able to adapt to the heating of different sizes within a certain range. If using far infrared bulb, note that under the lamp direction should avoid infrared ray is not conducive to the human eye. This bulb can be energy efficient. Bulb heating method applies to a small number but not often need; INA bearings heating occasions, usually light bulbs can also be used as lighting, in addition, does not require any other equipment.
5 sump heating method
This is a broader application of the traditional heating method, the sump from the bottom 50 ~ 70mm set metal mesh, bearings placed online, large bearings use hook lift. Excessive local heating of the bearings should not be put directly on the bottom to prevent contact with the bottom of the groove bearing parts, or the bottom of the groove precipitation dirt into the bearing. The the sump heating method points to note are as follows, you should use non-corrosive good thermal stability of mineral oil, the best transformer oil, oil and container should be kept clean. Sump capacity should be the size of the bearing is heated, and fuel may be, if the container is too small, in continuous operation, one into the bearing oil temperature will soon drop, the effect on the poor.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 7228CTYNP5 NSK | 140 | 250 | 42 |
| 7226ATYNP5 NSK | 130 | 230 | 40 |