With the development and the progress of the society, mechanization is widely used in the production and life.Bearing, as an integral part of the machinery, the scope of its use will be more and more widely, because as long as there are places are used bearing rotation.
A support and bearing mainly in machinery to reduce the effect of friction, so the precision of the bearing, the noise is directly related to the use of machinery and longevity.But business people always will often encounter some customers using the best bearing or imported bearing its efficiency is not high, the sliding bearing is related to the use of the bearing and selection problem.May be some people say that "the use of the bearing and selection is that users, I just I sell what users want".
But as a qualified sales people in addition to the master of its own products knowledge and proficient in the use of composite bearing products, namely the doctor sales, according to the user's form a complete set of product performance, the conditions of use to choose the best supporting bearings.This is at present the world each big company popular professional manufacture and sale, this way since in humanistic group shall also achieved good effect.
Because of the type of bearing much broader, the following will focus on the most widely use scope of the use of deep groove ball bearings and do some analysis.Hope to deepen the understanding of bearing less understanding of the bearing
A, the selection of the bearing
1, the selection of the bearing clearance: user when buying bearings generally just let us know in what type, grade, rarely on bearing clearance request, business people must ask bearing conditions of use, which the bearing rotating speed, temperature, fit tolerance are directly related to the selection of the bearing clearance.Generally under 3500 RPM speed motor mostly adopts CM clearance, such as high temperature and high speed motor, require the use of relatively large clearance.Bearing clearance after assembly will rise because of the inner hole and cylindrical reduction and lead to reduce, the reduction of clearance = interference quantity x 60% (except the bearing chamber is aluminum).Bearing clearance before assembly is 0.01 mm, for example, when the assembly interference quantity is 0.01 mm, the bearing assembly after the clearance is 0.004 mm.In theory at zero clearance noise and bearing life can reach the best state, but in actual operation considering the problems such as temperature, bearing clearance after assembly is 0.002 mm to 0.004 mm is better.
2, bearing type selection, bearing type is commonly used by the user's technical personnel according to the product of form a complete set of conditions and the load bearing for selection.Business people mainly learn the user's actual load is consistent with the selected bearing, if bearing can not meet the use requirements, should suggest customer re-election model as soon as possible, but unless special products on the choice models generally do not have what problem.
3, the choice of grease: the choice of grease are generally according to the requirements of the bearing rotating speed, heat resistance, noise and choose starting torque, etc, required business people to know a lot about the performance of all kinds of grease.
4, the choice of bearing seal type: the bearing lubrication can be divided into oil lubrication and grease lubrication.Oil lubricated bearing is generally choose form of bearing, grease lubricated bearing dust cover is generally selected or rubber seal seal.Dust cover suitable for high temperature or the use of good parts, seal two points contact seal and non-contact seal and contact seal dustproof performance is good but the starting torque, the sealing type starting torque is small, but there is no contact sealing performance is good.
Second, the bearing should be paid attention to when using
1, bearing assembly way: because the bearing is high precision products, such as improper assembly is easy to cause damage to bearing channel, result in bearing damage.When bearing assembly shall have a dedicated mold, not casually, 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 level state, if there are any tilt can lead to bearing channel due to mechanical damage, and make the bearing guide ring.
2, shaft and the bearing chamber tolerance selection and control: after the 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.When control the shaft and the bearing chamber tolerance so also want to control the roundness, at present many domestic manufacturers to control the tolerance, not to control the roundness.
3, 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 bearing has serious rust phenomenon.Many manufacturers will think is a problem of bearing before, after our propaganda, 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 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.
4, the assembly to prevent foreign body: bearing in loaded on the rotor dynamic balance when it is easy to dynamic balance of iron into the bearing inside, so it is best to install bearing before do dynamic balance.There are some manufacturers in order to convenient assembly, assembly in 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 the bearing interior storing up more, in the bearing rotates along axis to the bearing inside easily.Bearing chamber it is best not to apply oil or grease, if must apply to control shall not be storing up in bearing interior.
Bearing life is closely related to manufacturing, assembly, use, and must be made at each link to make the bearing is in optimum operation state, so as to prolong the service life of bearing.
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