Adequate lubrication of SKF combined bearing, correct use and common faults
Adequate lubrication of SKF combined bearing, correct use and common faults
2022年4月10日
Several knowledge elements need to be paid attention to in the correct installation of SKF non-standard bearings
Several knowledge elements need to be paid attention to in the correct installation of SKF non-standard bearings
2022年4月11日

Adequate lubrication of SKF combined bearing, correct use and common faults

  • The lubrication methods of SKF bearings are divided into grease lubrication and oil lubrication. In order to make the combined bearing function well, 首先, the lubrication method suitable for use conditions and purposes should be selected. 如果只考虑润滑, 油润滑的润滑性占主导地位. Adequate lubrication of SKF combined bearing, correct use and common faults

Adequate lubrication of SKF combined bearing, correct use and common faults

  • 然而, 脂润滑的优点是可以简化轴承周围的结构. 比较脂润滑和油润滑的优缺点. There are generally two kinds of fault phenomena of rolling bearing: one is that the temperature of the bearing installation part is too high, and the other is that there is noise in the bearing operation.Adequate lubrication of SKF combined bearing, correct use and common faults
  • The rolling bearing is allowed to make slight running noise during operation. If the noise is too loud or there is abnormal noise or impact sound, it indicates that the bearing is faulty.Adequate lubrication of SKF combined bearing, correct use and common faults
  • The causes of rolling bearing noise are complex. One is the wear of the mating surfaces of the inner and outer rings of the bearing. Due to this wear, the matching relationship between the bearing and the shell and between the bearing and the shaft is damaged, resulting in the axis deviation from the correct position and abnormal noise when the shaft moves at high speed. Adequate lubrication of SKF combined bearing, correct use and common faults
  • When SKF Bearing is tired, 它的表面金属会剥落, which will also increase the radial clearance of the bearing and produce abnormal noise. 此外, the insufficient lubrication of the combined bearing, the formation of dry friction and the breakage of the bearing will produce abnormal sound. After the bearing is worn and loose, 笼子松动损坏, which will also produce abnormal noise.Adequate lubrication of SKF combined bearing, correct use and common faults
  • The bearing rolling element and the inner and outer race raceways bear the action of periodic fluctuating load, resulting in periodic contact stress. 当应力循环次数达到一定值时, fatigue spalling will occur on the working surface of rolling element or inner and outer race raceway. Adequate lubrication of SKF combined bearing, correct use and common faults
  • If the load of the bearing is too large, it will aggravate this fatigue. 此外, improper bearing installation and shaft bending will also produce raceway spalling.Adequate lubrication of SKF combined bearing, correct use and common faults
  • The fatigue spalling of bearing raceway will reduce the operation accuracy of shaft and cause vibration and noise of mechanism.Adequate lubrication of SKF combined bearing, correct use and common faults
Adequate lubrication of SKF combined bearing, correct use and common faults
  • There is a return fire color on the raceway and rolling element of the burned bearing. 烫伤的原因一般是润滑不足, unqualified or deteriorated lubricating oil quality, and too tight bearing assembly.Adequate lubrication of SKF combined bearing, correct use and common faults.Adequate lubrication of SKF combined bearing, correct use and common faults
  • Uneven pits appear on the contact surface between the raceway and the roller of the bearing, indicating that the SKF Bearing has plastic deformation. The reason is that under the action of large static load or impact load, the local stress on the working surface of the bearing exceeds the yield limit of the material, which generally occurs on the combined bearing rotating at low speed.Adequate lubrication of SKF combined bearing, correct use and common faults
  • Adequate lubrication of SKF combined bearing, correct use and common faults.Adequate lubrication of SKF combined bearing, correct use and common faults
  • The reasons for the cracks of the bearing race may be the tight fit of the bearing, the looseness of the foreign or inner ring of the bearing, the deformation of the containing parts of the bearing, the poor surface processing of the installed bearing, etc.Adequate lubrication of SKF combined bearing, correct use and common faults
  • When the mechanism is running, the part where the bearing is installed is allowed to have a certain temperature. When touching the mechanism shell by hand, it should be normal to feel that it is not hot. 否则, it indicates that the bearing temperature is too high.Adequate lubrication of SKF combined bearing, correct use and common faults
  • The reasons for the high temperature of SKF Bearing are: the quality of lubricating oil does not meet the requirements or deteriorates, and the viscosity of lubricating oil is too high; The mechanism assembly is too tight (insufficient clearance); The assembly of combined bearing is too tight; The bearing race rotates on the shaft or in the shell; Excessive load; Broken bearing cage or rolling element, etc.Adequate lubrication of SKF combined bearing, correct use and common faults
  • When SKF Bearing is working, 由于外部或内部因素的影响, 原来的匹配间隙被改变了, 精度降低, and evenbiteis called clearance change failure. 过度干扰等外部因素, 安装不当, 温度升高引起的膨胀, 瞬时过载, 等等, and internal factors such as residual austenite and residual stress in an unstable state are the main reasons for the change and failure of clearance.Adequate lubrication of SKF combined bearing, correct use and common faults
  • Rotate the outer ring and carefully wash the junction of cage, rolling body and raceway. Any previously hidden part of oil residue needs to be thoroughly cleaned. Bearings should be attached after washing clean, Youlin dry cleaning, clean lined neutral meter support dry, or in the far-infrared drying oven slowly. Adequate lubrication of SKF combined bearing, correct use and common faults
  • Since even dry cleaning, Youlin drying or drying, the whole process should not put SKF Bearing Rings and adhere to any frame or rolling body. Universal joint bearing oil can be removed from the oil sealed package and immersed in acid free 3% kerosene or gasoline before delivery test in practice.Adequate lubrication of SKF combined bearing, correct use and common faults
  • Inspection of dripping lubricating oil and immediate delivery of dry or dry bearings shall be required. 此时, there is no oil film to protect the outer surface of SKF Bearing. The inspectors are not allowed to directly contact the skin in the whole process. The operators should wear clean gloves and draw rust by hand, but they must avoid mixing the antirust agent with the appearance of rolling bearing, otherwise the deviation of measurement results will be.Adequate lubrication of SKF combined bearing, correct use and common faults
  • The rusty stock shall be delivered immediately or handled, and the bearing shall be inspected after the whole inspection process is completed. Take too long to avoid corrosion. Pay attention to the use of clean and oil-free pure gasoline, which can also cause corrosion.Adequate lubrication of SKF combined bearing, correct use and common faults
  • If the bearing is dry or dry, check the outer surface without bearing oil film protection according to the regulations, drip lubricating oil and deliver it immediately. 此时, manpower in direct contact with the skin is not allowed in the whole inspection process. The operator should wear clean gloves and draw rust by hand, but must avoid mixing hands on the rolling surface of universal joint bearing with rust inhibitor, otherwise it will cause deviation of measurement results.Adequate lubrication of SKF combined bearing, correct use and common faults
  • The inspection of bearings is completed immediately after delivery or rust counting. During the whole inspection process, try not to last too long to cause corrosion. Pay attention to the use of clean and oil-free pure gasoline, which can also cause corrosion.Adequate lubrication of SKF combined bearing, correct use and common faults
  • The influence of grinding quality on the premature failure of SKF Bearing can be judged from the above test results. The grinding crack and grinding burn on one side of the raceway are a direct cause of the collapse of the ferrule and the premature failure of the bearing.
  • The macro morphology of the crack and the distribution characteristics of grinding burn revealed in this example show that the original position of the raceway is too deviated or the R of the raceway is not round, which increases the grinding allowance on one side of the raceway. When the feed in the coarse grinding stage is large When the grinding speed is fast, the whole raceway produces uneven grinding.
  • If the grinding wheel is not trimmed in time, it will promote the embedding or adhesion of grinding debris, resulting in the blockage and passivation of the grinding wheel pores, which will increase the imbalance of the grinding wheel, aggravate the spindle vibration, and even the grinding chatter caused by the vibration of the machine tool. 明显地, the grinding force changes periodically, forming intermittent burn strips.
  • In order to further understand the hardness distribution of ferrule and the microstructure characteristics of quenching and tempering microstructure and surface layer, the partially cracked inner ring and its fragments are selected, the macro hardness is set on the end face, and the longitudinal metallographic samples are intercepted near the crack by wire cutting method.
  • Cage noise mainly occurs in ball bearings and tapered roller bearings, When the bearing rotates, it will make a sound due to the vibration of the cage and the impact between the cage and the rolling element. This sound is periodic. Chatter (various bearings) is a sound with a certain frequency, which is generated by the vibration caused by large waviness on the raceway surface. Noise caused by improper use: it exists for all kinds of bearings. When the surface of the bearing raceway or rolling element is damaged, dented and rusted, Then there will be periodic noise and vibration Dirt noise will be generated when dust invades the bearing during operation This noise is aperiodic and also accompanied by vibration. Its sound size is not fixed, sometimes not

 Adequate lubrication of SKF combined bearing, correct use and common faults

  • The effect of bearing vibration on Timken bearing failure is obvious For example: peeling, 缩进, 腐蚀, crack Wear, ETC. will be reflected in the bearing vibration detection, so the vibration can be measured by using special bearing vibration measurement devices (frequency analyzer and vibration instrument, 等等) and the specific situation of abnormal vibration can be inferred through the frequency distribution. The measured values vary according to the service conditions of the bearing or the installation position of the sensor. 所以, it is necessary to analyze and compare the measured values of each machine in advance and determine the judgment standard
  • 一般来说, the temperature of Timken bearing rises slowly with the start of operation and reaches a stable state after 1 to 2 hours The normal temperature of the bearing varies with the heat capacity, heat dissipation, speed and load of the machine If the lubrication and installation are not appropriate, the bearing temperature will rise sharply and abnormal high temperature will appear. 在这种情况下, the machine must be shut down and necessary preventive measures must be taken
  • Although the bearing quality and other aspects are relatively good, the rolling bearing is a precision component, and its use must be carried out carefully accordingly. No matter how high-performance bearings are used, if they are not used properly, the expected high performance will not be obtained. The precautions for the use of bearings are as follows:
  • Keep the bearing and its surroundings clean.
  • Even small dust that cannot be seen by the eyes will have a bad impact on the bearing. 所以, keep the surrounding clean so that the dust will not invade the bearing.
  • Use with care.
  • Strong impact on Timken bearing during use will produce scars and indentation, which will become the cause of the accident. 在严重的情况下, it will crack and fracture, so we must pay attention to it.
  •  Adequate lubrication of SKF combined bearing, correct use and common faults
  • Use appropriate operating tools.
  • Avoid replacing with existing tools, and appropriate tools must be used.
  •  Adequate lubrication of SKF combined bearing, correct use and common faults
  • Pay attention to the corrosion of the bearing.
  •  Adequate lubrication of SKF combined bearing, correct use and common faults
  • When operating Timken bearings, sweat on your hands can be the cause of rust. Pay attention to operate with clean hands and try to wear gloves.
  •  Adequate lubrication of SKF combined bearing, correct use and common faults
  • Because Timken bearing is a high-precision product, if it is not assembled properly, it is easy to damage the bearing channel and lead to bearing damage. The bearing shall be equipped with a special mold during assembly, which cannot be knocked at will. When pressing the shaft, only the small ring can be stressed, and when pressing the large ring, only the large ring can be stressed. Pneumatic or hydraulic pressure is required during assembly.
  • During press assembly, the upper and lower molds shall be outside the horizontal state. If there is inclination, the bearing channel will be damaged due to stress and the bearing will make a guide sound.
  •  Adequate lubrication of SKF combined bearing, correct use and common faults
  • When the bearing is installed on the rotor for dynamic balance, it is easy to enter the iron filings generated during dynamic balance into the bearing, so it is necessary to perform dynamic balance before installing Timken bearing. In order to facilitate assembly, some manufacturers apply some oil or grease in the bearing chamber for lubrication effect during assembly, but it is often difficult for operators to control the amount.Adequate lubrication of SKF combined bearing, correct use and common faults
  •  If more oil or grease is accumulated in the bearing chamber, it is easy to enter the bearing along the shaft when the bearing rotates. The bearing shall not be coated with oil or grease. If it must be coated, it shall be controlled and there shall be no accumulation in the bearing chamber.
  • The feature of paint rust is that it often occurs in sealed motors. The sound of the motor is very good during assembly, but after it is put in the warehouse for some time, the abnormal noise of the motor becomes very large, and there is serious rust when the bearing is removed. In the past, many manufacturers thought it was the problem of Timken bearing. Adequate lubrication of SKF combined bearing, correct use and common faults
  • After our continuous publicity, now the motor factory has realized that it is mainly the problem of insulating paint. This problem is mainly because the acidic substances volatilized from the insulating paint form corrosive substances at a certain temperature and humidity, which corrodes the bearing channel and leads to bearing damage. 现在, the problem can only be to select good insulating paint and assemble after drying and ventilation for a period of time.Adequate lubrication of SKF combined bearing, correct use and common faults
  • The service life of the bearing is closely related to manufacturing, assembly and use. It must be done well in each link in order to make the bearing in the running state, so as to prolong the service life of the bearing.
  • Rolling bearings make precision parts, so it is required to be cautious when using them. Since high-performance bearings are used, if they are not used properly, they can not achieve the expected performance effect. 所以, the following matters should be paid attention to when using Timken bearings:
  • Keep the bearings and their surroundings clean. Even if the invisible smile dust enters the bearing, it will increase the wear, vibration and noise of the bearing.Adequate lubrication of SKF combined bearing, correct use and common faults
  •  Adequate lubrication of SKF combined bearing, correct use and common faults
  • When using and installing, it shall be careful. It is not allowed to punch with force, directly knock the bearing with a hammer, and transfer pressure through the rolling body.Adequate lubrication of SKF combined bearing, correct use and common faults
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