One is using acetylene oxygen bearing directly heating;
The other is for small bearings used in oil heating, thermal, expand the bearing inner diameter, so that assembly.
These methods in the long term has been widely used in equipment maintenance, basic meet and solve the problem of the bearing assembly in equipment maintenance.
The second approach is to ensure the bearing in the process of heating temperature of heating surface is uniform, it is difficult to determine.
Because traditional acetylene oxygen heating is a single burner gas, and heating process only by experience, by heating the TIMKEN bearing temperature added to what is right is very difficult to master.
Temperature is too high, can produce annealing of bearing, the mechanical properties of the low bearing;
Temperature is too low, the thermal expansion values is not enough, difficult to assemble.
In equipment repair, the repairman is sometimes not enough because of TIMKEN bearing heating, TIMKEN bearing is less than the right position, have forced to take down heavy, thus increasing the intensity of labor.
To this end, we put forward a kind of changing traditional bearing.
1.
Electricity heating replace acetylene oxygen heating.
Will become a cylindrical furnace, electric furnace design in his plane named TIMKEN bearing electric heater, according to the different bearing inner diameter can be designed into different bearing power and specification of the electric heater (
Best suitable scope in the bearing inner diameter 300 mm/above)
。
The heating device has the following advantages: uniformity and stability of thermal radiation, by heating the TIMKEN bearing surface dust, clean, clean, easy to measure and control the TIMKEN bearing temperature.
2.
Using infrared thermometer for temperature monitoring by heating the TIMKEN bearing surface.
Bearing controlling the heating value of general assembly in 100 ℃ ~ 120 ℃ advisable.
Within this temperature, thermal expansion value maximum bearing steel, facilitate TIMKEN bearing assembly, the temperature will not change the bearing mechanical properties, and high reliability.
TIMKEN bearing matters should be paid attention to when using 1, axis and the choice of the TIMKEN bearing chamber tolerance and control: after the TIMKEN bearing pressure into the bearing should be flexible rotation without blocking.
If there are any obvious rotation is not flexible, indicates the size of the shaft is too big, tolerance to downgrade.
Such as bearing pressure into the shaft by hand after the rotation has obvious 'sasha vujacic' feeling, may be the shaft or shaft roundness tolerance is too big.
So in good control of axis and TIMKEN bearing chamber of tolerance when also want to control the roundness, at present many domestic manufacturers to control the tolerance only, not to control the roundness.
2, TIMKEN bearing assembly way: because the bearing is high precision products, such as improper assembly is easy to cause damage to bearing channel, result in TIMKEN bearing damage.
TIMKEN bearing should have a special mould, when it is assembled cannot knock at random, only small circle of stress when pressure into the shaft, pressure can force the circle circle.
Require the use of pneumatic or hydraulic assembly, lower die when being connected to outside the state level, if there are any tilt causes TIMKEN bearing channel due to mechanical damage, and make the TIMKEN bearing guide ring.
3, the assembly to prevent foreign body: TIMKEN bearing when loaded on the rotor to do dynamic balance will easily generated when the dynamic balance of iron into TIMKEN bearing internal, so it is best to install bearing before do dynamic balance.
There are some manufacturers in order to convenient assembly, assembly in TIMKEN bearing indoor coated with some oil or grease lubrication effect, but usually operators good amount of it is hard to control, if oil or grease in TIMKEN bearing indoor storing up more, in TIMKEN bearing rotates along axis to the TIMKEN bearing inside easily.
TIMKEN bearing chamber is best not to apply oil or grease, if must apply to control shall not be storing up in TIMKEN bearing interior.
4, paint, rust prevention: paint rust is characterized by multiple in sealing type motor, the motor sound is very good, when it is assembled but put some time in the warehouse, the motor sound is very big, remove the TIMKEN bearing has serious rust phenomenon.
Before a lot of manufacturers will think is a problem of TIMKEN bearings, through our continuous publicity, motor factory now have realized mainly is a question of insulating varnish.
Acid varnish comes out of the problem is mainly due to the formation of corrosive substances under certain temperature and humidity, the TIMKEN bearing channel after corrosion result in bearing damage.
The problem now is only to choose good insulating paint, after drying and ventilation assembly after a period of time.
