【 Weak current College 】 bearing selection and usage notes---Power By 【 China power house network 】

With social progress and development, the mechanization of production and life has been widely used. Bearing as the machinery is an indispensable part of the scope of its use are also increasingly widespread, because as long as the rotation of the bearing.

Bearings in machinery mainly supporting and reduce friction, thus bearing accuracy, noise, etc. are directly related to the use of machinery and life. But business people always encounter customers that use the best bearings or imported bearing its efficiency is not high, this is related to the use and selection of the bearing. Perhaps some people will say "bearing service and select the user, I only look at what the user wants to sell me something." But as a qualified sales personnel in addition to mastering their own product knowledge, but also proficient in the use of the product, namely doctors-sales, according to the users of ancillary products performance, using criteria to select the best matching bearing. This is the world's major companies popular specialized manufacturing and sales, the way in this

Because bearing type number range, the following will be primarily on the use of the widest range of deep groove ball bearings in use and select some analysis. Want to know about bearing less one can deepen understanding of the bearing.

I. bearing selection

1. the choice of bearing type: bearing type is normally provided by the user's technical staff under products use conditions and withstand the load on the bearing. The main business people understand whether a user's actual load and the selected bearing, if the bearing does not meet requirements, should advise the customer as soon as possible, but the election model unless special products in select models generally does not have any problems.

2. selection of the bearing clearance: users purchase bearings generally only tells what type, grade, rarely on bearing clearance requests, business people must ask the bearing of the conditions of use, including the bearing speed, temperature, combined with tolerance are directly related to the selection of the bearing clearance. General at 3500 RPM motor speed below most CM clearance, such as high temperature and high speed motor requires a relatively large clearance. Bearing clearance after Assembly will bore of swollen and outer circle of narrow and result in a reduction of the quantity of the clearance = interference × 60% (bearing housing is aluminum). For example, prior clearance is bearing Assembly, assembly 0.01mm when interference is 0.01mm, bearing the clearance after Assembly to 0.004mm. In theory, bearing noise zero clearance and life are the best State, but in actual operation taking into account issues such as the temperature rise, the bearing clearance after Assembly to 0.002mm-0.004mm better.

3. selection of oils and fats: fats is generally chosen is depending on the bearing speed, temperature, noise requirements and starting torque, etc., require business people on the various oils and performance very well.

4, bearing seal type selection: bearing lubrication can be divided into oil lubrication and grease lubrication. Oil lubricated bearings usually choose forms bearing grease lubricated bearings for general use shields or sealing rubber seals. Dust cover for high-temperature or use environment good parts, seals Division contact seal and non-contact seal, contact seal dustproof performance but large starting torque, non seal starting torque, the sealing property is not the contact type.

The bearing is currently in auto motor bearing, appliance motor bearings, motor bearings, motor bearings and other health care professions are specialized manufacturing so that bearing noise and life to achieve peak performance.

Second, the bearing should be used for attention

1, shaft and housing tolerances of selection and room control: bearing pressed into the bearing after rotating flexible without blocking. If there are significant rotation not flexible, the axis size is too big, tolerance to go down. If the bearing pressed into the shaft rotation by hand after the apparent "sand" in the sense that it may be that the shaft tolerance is too large or axis of roundness. Therefore, control the shaft and housing tolerances to room control the roundness, the current domestic many manufacturers only tolerance control, control of roundness.

2. bearing Assembly methods: because the bearings are high-precision products, such as improper easily assembled on bearing raceways caused damage, causing damage to the bearing. Bearings in the Assembly should be dedicated mold, cannot beat, when the pressure in the axis forces only small ring, pressurized circle can only force large circle. Assembly required pneumatic or hydraulic, upper and lower mould when the press to from a State level, such as a slant cause bearing Raceway damage due to stress, and the bearings have guide rings.

3. Assembly of foreign bodies to prevent: bearing in the rotor dynamic balance is made easy when the dynamic balance of iron filings into the bearing internal, it is therefore advisable to do dynamic balance before loading bearings. Some manufacturers in order to assemble and convenient, when assembling in bearing Interior coloured some oil or grease lubricated, but often the operations staff is difficult to control, and if oil or grease in the bearing interior product to stay more in the bearings rotate easily along the shaft into the bearing. Bearings, preferably not coated with oil or grease, e.g. non-smear is the control shall be accumulated to stay inside the bearing.

4, paint and Rust prevention: the paint and rust is characterized by multiple in sealed-motor, motor Assembly will sound very good, but putting in the warehouse for some time, the motor noise become very large, remove the bearings have serious rust. Previously many manufacturers will be regarded as bearing problems, through our ongoing publicity, now motor factory was aware of the problems mainly insulating varnishes. The problem is mainly due to the volatile acidity of insulating material at a certain temperature, humidity, corrosive substances, formed under the bearing raceway caused damage to the bearing corroded. The problem is only a selection of good insulating varnishes, and after drying, ventilation time Assembly.

Bearing life is and manufacture, Assembly, use are closely related, must in every aspect, the bearing is the best running conditions, thus lengthens the service life of the bearing.