Common forms of SKF bearings fatigue peeling plastic indentation, abrasion, corrosion, broken, and rust. Due to bearing failure forms of different monitoring methods applicable to the different general monitoring method of vibration noise, temperature, abrasion particles, acoustic emission, bearing clearance, oil-resistance and fiber law. Considerable experimental proof of the method, the vibration signal monitoring application of the law of the widest range, it is almost above all failure modes, and other methods have a lot of limitations, one or a few only apply to several failure forms of detection. When the rolling bearing surface cracking and spalling of fatigue, injury, bearing abnormal vibration would be generated.
Pulse energy band is wide, is theoretically infinite width, is bound to cause the system to resonance. By filtering the resonance signal, get a modulated signal, the envelope of the signal detection, fault signal envelope of low frequency signals are received. Envelope power spectrum analysis of the signal may be failure, this is the resonance-demodulation method.
Tie is correctly selected, you must know the actual load bearing conditions, temperatures and other requirements, which are actually very difficult. Therefore, in most cases is selected based on refinements of tie.
Amount of WINS between ring and shaft or housing depends on the size of load, amount of winning larger heavier loads, a lighter load a smaller amount won.
1, rotation speed and temperature:
With the development of science and technology, machine tool spindle speed high speed increasing the scope, therefore, the fag bearings high speed running stability requirements are also getting higher and higher. Machine tool spindle bearing temperature rise limit bearing speed is an important factor. Typically, proper selection of non-standard bearing type, the tolerance class, how it is configured, clearance (preload), lubricant and lubrication method, to a certain extent improve high-speed rolling bearing performance.
Technical requirements for spindle bearings
2, and bearing service life:
General machine tools, maintain spindle spindle components of life and in particular its accuracy of age and, therefore, require bearing spindle life components in precision performance to meet requirements. Heavy machine tools or heavy cutting machine tool, you should first consider non-standard bearing's load-carrying capacity.
Precision rolling bearing parts and request accordingly cautious when using both bearings using high performance, if used improperly, could not achieve the desired performance, so use the bearing should be aware of the following considerations:
Keep the non-standard bearing and its surroundings clean. Even dust bearing invisible smile, also increases bearing wear, vibration and noise.
Used to carefully when installing, do not allow powerful punch, tap bearing with a hammer directly is not allowed, passed through the rolling pressure is not allowed.
Use and precise installation tools, using special tools as much as possible, avoid using things like fabric and fiber.
Prevent corrosion of the bearing, the direct use of hands when taking bearings to fully wash away the sweat on his hand, after the mineral oil and coated with high quality
NSK bearings size is based on standard tolerances for dimension of inner diameter and outer diameter manufacturing, bearing inner ring and shaft, outer ring and block bore combined with tension only through the control shaft tolerances bore tolerances to achieve. Non-standard bearing inner ring and shaft meet the base hole, co-ordination between the bearing outer ring and bore the crankshaft.
Examination is very important bearing in operation, cannot be ignored, mainly check the lubrication of rolling bearing noise, vibration, temperature, status, and so on. We will briefly introduce the sound of rolling bearing, ball size and quality check measurement should be used to check the operation of cars bearing, using advanced tools to accurately judge the issue, bearing split, even if there is a slight injury, also is making an abnormal sound and irregular sound, with acoustic logging can tell.
Then Timken bearings vibration checks to see if bearings are sensitive to the damage, rust, cracks, spalling, indentation, abrasion, are reflected in the measurement of bearing vibration, so by using a special vehicle measuring bearing vibration (frequency Analyzer, etc) you can measure the size of the vibration, through frequency not infer exceptions to the specific situation. But each machine measured values for bearings, such as conditions of use or the sensor installation location differs and therefore require prior to analysis and comparison of the measurements on each machine after the judging criteria.
1, when used in bearings, connecting the surrounding environment clean, do not stick up sweat and dirt. Delineation of staff awareness by bearings, special need to beware of acids, such as indentation, the less damage. To assure bearing function, should follow the homework-scale equipment, on schedule to protect bearings, nursed back to health and inspection, contains a monitoring status, fill in the form smooth agent, arranging Assembly seizure.
2, bearing directly on the floor store (need 30cm from the ground) to prevent direct light and cold walls. In order to prevent rust, kept at temperatures around 20 ° c, humidity 65% environments such as the following, auto bearing arrangements in an acidic environment, easy to rust, discoloration, wipe the bearings, shafts, gloves, Ceiba silk shell, dross into the bearings are external and common cause of sector exception is generated, is with the necessary details.
3, bearing measurement deviation 10% public service shall be as follows. General military 10%~33% of the difference of the measured deviation, and followed a public-service-quality progress, deviation as a percentage of the larger, or smaller public service, deviation as a percentage of the higher the car bearing the public service up to IT5, it is hard to reach 10%. Measuring deviation implies the identification of public service can not only relax 10%, but rather to give a safe margin, to assure user acceptance exam.
4, bearing in the airside departure area before they conducted raids and confiscated the amount of blocks, scales and measuring instruments and arrangements in raids on a metal plate inside, such as permission faster to make these items of homogenization temperature and the room temperature. Has dry or drying of bearing, should by delineation drops into smooth oil and immediately entrusted raids, at this time INA bearings outside overview no oil film asylum, in all raids process in the are shall not straight fight and the staff skin, manipulation who should wear clean gloves, or hand Shang James to rust agent, but required prevent hand Shang of rust agent mixed with car bearing of turn overview, or will makes measuring results produced illnesses.



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