- Hello Customer - Log in or Register!
When the inner diameter of the bearing is greater than 70mm, or with an interference fit is large, heated by the SKF bearings hole expansion, so install saving time and avoid damage caused by excessive force.
Is where you need to control the heating temperature, usually bearing heating to 80 ° c, up to 100 ° c. It is enough. Above 120 ° c will cause bearing tempering, hardness of rings reduce loss of precision.
A, common methods of heating are:
1, electric plate heating method:
FAG bearings placed in a temperature of 100 ° c for heater plate for a few minutes, this method is most convenient, such as flipping a few times so the bearing heat evenly, and high efficiency, size bearings are available using this method.
2, electric heating method:
NSK bearings placed in enclosed automatic temperature control of electric heating, heating uniformity, temperature control is accurate, quick heating, suitable for heating a lot of bearing applications.
3, induction heating method:
Using induction heater can be fast, reliable, and clean the bearing is heated to the desired temperature, particularly suitable for inner ring of tight fit, due to the heating of the inner ring, while heating rarely, so you can more easily in the shaft, easy admission holes also.
4, light bulb heating method:
Use 50W light bulb to heat bearings, ensures that the heating temperature 100 ℃, smaller bearings can be placed directly on the bulb, larger TIMKEN bearings can be placed in the bulb's cone-shaped hood, cone-shaped hood can prevent bulbs heat loss and heat evenly. Cone-shaped hood can be adjusted, within a certain range to adapt to heat bearings of different sizes. If the use of far-infrared light bulbs, note the bulbs should be down to avoid infrared rays is not conducive to people's eyes. Import pump the bulb can save energy. Light bulb heating method applied to fewer and less frequently required; heating of bearings, usually light bulbs can also be used for lighting, and does not need any additional equipment.
5, oil tank heating method:
This is a wide application of conventional heating methods, oil from the 50~70mm Office is located at the bottom of metal mesh, bearings placed online, large bearings are hanging by hooks. INA bearings should not be placed directly in the tank bottom to prevent contact tank bottom bearings are localized to the site of heat is too high, or slot precipitated the end of the dirt into the bearing. Oil heating of points to note below, you should use non-corrosive thermal stability of mineral oil, preferably a transformer oil, oil and containers shall be kept clean. Capacity of the tank should be heated up and bearing size and oil content may be, if the container is too small, when in continuous operation, a into the bearings the oil temperature will drop soon, the effect on the wrong side.
B, points heating installation method:
① the proper temperature control of heating, high temperature bearing damage, temperature is too low the rings expansion volume, the effect is not significant. 80~1000℃ the heating temperature of the thermal expansion of diameter of the inner ring, which is for General interference with bearings, is already sufficient.
② once reached the required temperature, will be installed as soon as possible, in order to avoid installation difficulties with cooling.
③ KOYO bearings when cooling in the width direction also has shrunk, so installation should exert some pressure on the inner ring shoulder pressing and cooling with very thin feeler gauges test after test, is in the inner ring and shaft shoulder there is a gap between them. In short, butterfly requires skilled, speedy and accurate.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 30328U NTN | 140 | 300 | 62 |
| 32228U NTN | 140 | 250 | 68 |