Bearing common sense: the use and selection of motor bearings-Wenzhou Bearing wholesale

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Bearing common sense: the use and selection of motor bearings

点击数：6382 日期：2014/4/4

With social progress and development, mechanization has been widely used in production and life. Bearing as a part of machinery is indispensable, its use scope is wider, because as long as the rotation of the place to use bearing. Bearings in machinery is mainly plays a supporting and friction reducing effect, so the precision of the bearing, noise are directly related to the use and the service life of machinery. But business people often encounter customers that always use bearing or bearing the best its efficiency is not high, which is related to the use and choice of bearings. Maybe someone will say that "the use and selection of the bearing that is a matter for the user, the user to what I do what I sell". But as a qualified sales personnel in addition to master their own product knowledge but also proficient in the use of products, doctors sales, according to the performance, the user matching products use conditions supporting bearing the best choice. This is currently the world's largest popular professional manufacturing and sales, it has achieved good results in the group since. Because of the wide range of bearing type, the following will use a deep groove ball bearing is the most widely used and do some analysis. We hope to bearing fewer people can deepen the understanding of bearing understanding One, the choice of bearings 1, the selection of bearing type: type of bearing is generally determined by the user's technical staff according to the related products using condition and load on the bearing selection. If the actual load service personnel are mainly about the user's consistent with the selected bearing, if the bearing is not up to the requirements, should advise the customer as soon as possible re-election models, but unless special products in the choice of models generally do not have what problem. 2, selection of bearing clearance: the user at the time of purchase bearing generally will only inform on what type, grade, few would claim on bearing clearance, operations personnel must ask the bearing conditions of use, the running speed of the bearing, temperature tolerance, are directly related to the selection of bearing clearance. The motors are generally below 3500 rpm speed mostly use CM clearance, such as high temperature and high speed motor requires a clearance is relatively large. Bearing clearance after the assembly because of reduced round expanded hole and cut, clearance reduction amount = amount of interference by 60% (except for the bearing housing is aluminum). Such as bearing clearance before assembly is 0.01mm, assembly interference of 0.01mm, then the clearance of 0.004mm bearing assembly. Bearing in the theory of noise in the zero clearance and life to achieve the best state, but consider the problem to the temperature rise in the actual operation, bearing clearance after assembly is 0.002mm-0.004mm better. 3, grease selection: selection of oils are generally choose according to the running speed of the bearing, temperature, noise requirements and starting torque, requirement business performance is understanding of various oils. 4, bearing seal type selection: bearing lubrication can be divided into oil and grease lubrication. Oil lubricated bearing selection form bearing, grease lubricated bearings are generally use dustproof cover or rubber seals. Dust cover is applicable to high temperature or use good parts, seal two kinds of sealed contact and non-contact seal, contact type sealing dustproof performance is good but the torque, non-contact seal starting torque is small, but good sealing properties of no contact. Two, the bearing use should pay attention to matters Selection and control 1, shaft and bearing chamber tolerance: press bearing bearing should be flexible rotation not block a sense of. If there is obviously the rotation is not flexible, indicates that the axial size is too large, the tolerance to cut. If the bearing onto the shaft by hand after turning has obvious "rustle" sense, the tolerances of the shaft may be too large or the roundness of the shaft is not good. So in the control of the shaft and housing tolerances to control the roundness, many domestic manufacturers only on tolerance control, no control of roundness. 2, the bearing assembly: because the bearings are precision products, such as improper assembly is easy to bearing raceway damage, cause damage to the bearing. Bearing assembly shall have the special mould, can not be beat, after pressing shaft when only small force, force pressure when only circle circle. The assembly by pneumatic or hydraulic press, the upper and lower mold to outside in the horizontal state, if tilt will cause the bearing channel due to the stress damage, and the bearing guide ring. 3, to prevent foreign bodies bearing assembly: easily mounted to the rotor dynamic balance when the dynamic balance of iron filings into bearing interior, so it is best to install bearing dynamic balancing. Some manufacturers in order to convenient assembly, the assembly of some oil or grease lubrication effect in the bearing chamber painted, but the operation is often difficult to control, if the oil or grease in the bearing chamber accumulates more, in the bearing rotates easily along the shaft into the bearing internal. The bearing chamber is best not to oil or grease, such as non coated not to control may not be in the bearing chamber of accumulation. 4, rust prevention paint: paint rust is characterized by multiple sealed type motor, the motor voice in the assembly is very good, but in some time within the warehouse, the electrical noise change greatly, remove bearing with serious rust. Many manufacturers are considered to be before the bearing problem, through our advocacy, motor factory is now aware of the main insulation paint problems. This is mainly because the acidic material insulating paint volatile out of the formation of corrosive substances under certain temperature, humidity, the bearing groove corrosion cause bearing damage. The Q

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