Diagnosis method of fag bearing cage
Diagnosis method of fag bearing cage
2022年5月12日
Rolling Koyo bearing with low noise requirements
Rolling Koyo bearing with low noise requirements
2022年5月12日

Precautions for using SKF Bearing

Keep SKF bearings and their surroundings clean

  • Rolling bearing is a fine component, so it should be used very carefully. Even if high-quality SKF bearings are not used properly, they will not achieve the expected results. The precautions for the use of SKF bearings are as follows:4Precautions for using SKF Bearing
  • Even the fine dust that cannot be seen by the naked eye will bring adverse effects to SKF bearings. Therefore, keep the surroundings clean so that dust will not invade the SKF Bearing.4Precautions for using SKF Bearing
  • Use carefully
  • Severe impact on SKF Bearing during operation will cause scar or indentation and induce disorder. In serious cases, it will cause cracks and fractures, which must be paid attention to.4Precautions for using SKF Bearing
  • Using SKF Bearing special tools
  • Use something at will, not for special use.4Precautions for using SKF Bearing
  • When operating SKF bearings, hand sweat will form rust. Pay attention to the operation with clean hands, wear gloves as much as possible and pay attention to corrosive gases
  • The damage of imported bearings of cement machinery is very common, because cement manufacturing often has great wear and tear on these mechanical equipment. How to better understand its vulnerable parts and better carry out production is our concern! 4Precautions for using SKF Bearing
  • The imported bearing of mechanical equipment is a vulnerable part, and its good operation directly affects the performance of the whole equipment. In cement machinery and equipment, there are many cases of equipment failure caused by the early failure of imported rolling bearings. Therefore, finding out the root cause of the fault, taking remedial measures and eliminating the fault is one of the keys to improve the system operation rate.4Precautions for using SKF Bearing
  • a. Overheating. The color of the raceway, steel ball or retainer of the roller changes, indicating that the imported bearing is overheated. The increase of temperature will reduce the effect of lubricant and make the oil lubrication difficult to form or disappear completely.4Precautions for using SKF Bearing
  •  If the temperature is too high, the materials of raceway and steel ball will be annealed and the hardness will decrease. This is mainly caused by unfavorable heat dissipation or insufficient cooling under the condition of heavy load and high speed. The solution is to fully dissipate heat and add cooling.4Precautions for using SKF Bearing
  • b. Overload. Severe surface peeling and wear indicate the failure of the imported rolling bearing due to early fatigue caused by overload (in addition, too tight fit will also cause a certain degree of fatigue). Overload will also cause serious wear of imported bearing steel ball raceway, large-area peeling and sometimes overheating. The remedy is to reduce the load of imported bearings or improve the bearing capacity of imported bearings.4Precautions for using SKF Bearing
  • c. Low load vibration erosion. Elliptical wear marks appear on the axial position of each steel ball, which indicates that the failure is caused by excessive external vibration or low load vibration when the inlet bearing does not work and does not produce lubricating oil film. The remedy is to isolate the imported bearing or add anti-wear additives to the lubricating grease of the imported bearing.4Precautions for using SKF Bearing

Damage form analysis and remedy of imported rolling bearing 

  • B. vibration analysis of imported rolling bearing
  • The typical failure mode of imported rolling bearing is simple fatigue spalling in rolling contact. The spalling surface area is about 2mm and the depth is 0.2mm ~ 0.3mm, which can be judged by the vibration detected by the monitor. Spalling may occur on the inner race surface, outer race or rolling element. Among them, the inner race is broken more often due to high contact stress.4Precautions for using SKF Bearing
  • Among all kinds of diagnostic technologies used for imported rolling bearings, vibration monitor monitoring method is still the main one. Generally speaking, the time domain analysis method is relatively simple and suitable for occasions with low noise interference.4Precautions for using SKF Bearing
  •  It is a good method for simple diagnosis; Among the frequency domain diagnosis methods, the resonance demodulation method is mature and reliable, which is suitable for the precise diagnosis of imported bearing faults; The time-frequency analysis method is similar to the resonance demodulation method, which can correctly describe the time and frequency characteristics of the fault signal, and has more advantages.
Precautions for using SKF Bearing

Prevent SKF Bearing from rusting

  • Rolling bearing is a fine component, so it should be used very carefully. Even if high-quality SKF bearings are not used properly, they will not achieve the expected results. The precautions for the use of SKF bearings are as follows:

Keep SKF bearings and their surroundings clean

  • Even the fine dust that cannot be seen by the naked eye will bring adverse effects to SKF bearings. Therefore, keep the surroundings clean so that dust will not invade the SKF Bearing.
  • Use carefully
  • Severe impact on SKF Bearing during operation will cause scar or indentation and induce disorder. In serious cases, it will cause cracks and fractures, which must be paid attention to.
  • Using SKF Bearing special tools
  • Use something at will, not for special use.

Prevent SKF Bearing from rusting

  • When operating SKF bearings, hand sweat will form rust. Pay attention to the operation with clean hands, wear gloves as much as possible and pay attention to corrosive gases
  • The damage of imported bearings of cement machinery is very common, because cement manufacturing often has great wear and tear on these mechanical equipment. How to better understand its vulnerable parts and better carry out production is our concern!
  •  The imported bearing of mechanical equipment is a vulnerable part, and its good operation directly affects the performance of the whole equipment. In cement machinery and equipment, there are many cases of equipment failure caused by the early failure of imported rolling bearings. Therefore, finding out the root cause of the fault, taking remedial measures and eliminating the fault is one of the keys to improve the system operation rate.
  • a. Overheating. The color of the raceway, steel ball or retainer of the roller changes, indicating that the imported bearing is overheated. The increase of temperature will reduce the effect of lubricant and make the oil lubrication difficult to form or disappear completely.SKF Bearing
  •  If the temperature is too high, the materials of raceway and steel ball will be annealed and the hardness will decrease. This is mainly caused by unfavorable heat dissipation or insufficient cooling under the condition of heavy load and high speed. The solution is to fully dissipate heat and add cooling.SKF Bearing
  • b. Overload. Severe surface peeling and wear indicate the failure of the imported rolling bearing due to early fatigue caused by overload (in addition, too tight fit will also cause a certain degree of fatigue). Overload will also cause serious wear of imported bearing steel ball raceway, large-area peeling and sometimes overheating. The remedy is to reduce the load of imported bearings or improve the bearing capacity of imported bearings.SKF Bearing
  • c. Low load vibration erosion. Elliptical wear marks appear on the axial position of each steel ball, which indicates that the failure is caused by excessive external vibration or low load vibration when the inlet bearing does not work and does not produce lubricating oil film. The remedy is to isolate the imported bearing or add anti-wear additives to the lubricating grease of the imported bearing.SKF Bearing
  • Damage form analysis and remedy of imported rolling bearing B. vibration analysis of imported rolling bearing
  • The typical failure mode of imported rolling bearing is simple fatigue spalling in rolling contact. The spalling surface area is about 2mm and the depth is 0.2mm ~ 0.3mm, which can be judged by the vibration detected by the monitor. Spalling may occur on the inner race surface, outer race or rolling element. Among them, the inner race is broken more often due to high contact stress.SKF Bearing
  • Among all kinds of diagnostic technologies used for imported rolling bearings, vibration monitor monitoring method is still the main one. Generally speaking, the time domain analysis method is relatively simple and suitable for occasions with low noise interference. SKF Bearing
  • It is a good method for simple diagnosis; Among the frequency domain diagnosis methods, the resonance demodulation method is mature and reliable, which is suitable for the precise diagnosis of imported bearing faults; The time-frequency analysis method is similar to the resonance demodulation method, which can correctly describe the time and frequency characteristics of the fault signal, and has more advantages.SKF Bearing

First of all, when the fag bearing is disassembled, a suitable puller shall be used to pull the fag bearing out.

 

  • Under the condition that the size, shape and accuracy of the fag bearing assembly hole of the bearing seat are not good, the fag bearing will be affected and cannot carry out its function.Precautions for using SKF Bearing
  •  For example, if the dimensional accuracy and shape accuracy of the inner hole of the common part fag bearing seat are not good, the outer ring of the fag bearing will be deformed, resulting in the deterioration of the roundness of the inner hole of the fag bearing;Precautions for using SKF Bearing
  •  If the accuracy of the retaining shoulder is not good, the outer ring and roller of fag bearing will tilt, which will aggravate the concentrated load, reduce the fatigue life of fag bearing, and even lead to the damage and sintering of the holder;Precautions for using SKF Bearing
  •  If the accuracy of fag bearing gear of spindle rod in fag bearing inner ring is not good, such as the accuracy of size, roundness, cylindricity, waviness, coarseness and position, it will also clearly lead to the addition of vibration value of the whole set of spindle.Precautions for using SKF Bearing
  • Secondly, the complete set of fag bearings is strictly selected and matched before assembly, so the scattered fag bearing parts cannot be exchanged and used without new measurement and matching before use.
  • Third, the cleaning of fag bearing and spindle foot. Because the ingot foot structure is compact, there are many other parts in the ingot foot cavity. The device method of Qingdao Ruijing fag bearing electromechanical fag bearing will also affect the cleanliness of the fag bearing task cavity. Precautions for using SKF Bearing
  • Therefore, the process of pre cleaning the spindle foot parts before the assembly and fine cleaning the assembly spindle foot including fag bearing in the future is a relatively reasonable process.Precautions for using SKF Bearing
  • Fourth, FAG bearing should not be bumped and impacted during assembly. Bumping and impact are easy to form collision between fag bearing parts, resulting in fag bearing failure.Precautions for using SKF Bearing
  • Fifth, when crimping the bearing seat, pay attention to controlling the crimping angle, strength and other factors to prevent unreasonable crimping from forming the deformation and failure of fag bearing parts.Precautions for using SKF Bearing
  • Sixth, for fag bearings that have exceeded the anti rust period or have been stored for a long time, the fatigue life of rolling bearings has considerable development potential, which can show rust or roller sticking due to the drying of anti rust oil.Precautions for using SKF Bearing
  • The feature of this Timken bearing grinding method is that all grinding allowance (0.20 ~ 0.60ram) is ground in a longitudinal cutter with a small longitudinal feed (f_; longitudinal = 0.08b ~ 0.15bmm / R). Using this grinding method, the grinding wheel needs to be trimmed into a front cone part (Fig. 7-5a) or a stepped shape (Fig. 7-5b) to gradually reduce the cutting allowance. Precautions for using SKF Bearing
  • Otherwise, the cutting work is mainly concentrated on the outer corner of the grinding wheel, which makes the outer corner of the grinding wheel blunt rapidly and affects the grinding efficiency and surface quality.Precautions for using SKF Bearing
  • Attention should be paid to when trimming stepped grinding wheel: the large cylindrical surface plays the role of fine grinding and polishing, so it should be trimmed more finely, and the other stepped surfaces play the role of rough grinding and should be trimmed more coarsely; Precautions for using SKF Bearing
  • In addition, the step height close to the outer layer of the workpiece shall be larger, while the step height close to the finished surface shall be smaller. In this way, we can obtain high productivity and ensure small surface roughness value.Precautions for using SKF Bearing
  • However, dressing the grinding wheel is relatively complex, and the structure of the workpiece must allow the grinding wheel to exceed a large distance from both ends of the machined surface, so it is only applicable to some parts whose grinding structure meets the above requirements in mass production. Precautions for using SKF Bearing
  • Tests in some factories have proved that the productivity of this grinding method can be about twice as high as that of longitudinal grinding method, and sufficient accuracy and small surface roughness can be obtained at the same time. Principle requirements for inner packaging method of NTN bearing:Precautions for using SKF Bearing
  • ① Micro NTN bearing: every 10 ~ 15 sets of NTN bearings are put into a plastic cylinder, and every 5 ~ 10 plastic cylinders are put into a carton (or bag or roll). ② Medium and small NTN bearings: multiple sets of NTN bearings are wrapped with polyethylene film inside and kraft paper or polyethylene composite paper outside; Install multiple sets of NTN bearings into a plastic cylinder (box); A single set of NTN bearings shall be packed in polyethylene film bags, folded or sealed, and then loaded into a carton.Precautions for using SKF Bearing

 Large NTN bearings:Precautions for using SKF Bearing

  • It is packed in a single set with polyethylene film or polyethylene composite paper, and then put into a carton; Use a polyethylene film bag, pack it in a single set, fold the bag mouth, and then put it into a carton; Put a single set into a special plastic box; Precautions for using SKF Bearing
  • A single set of three-layer wrapping packaging: polyethylene film tape or composite paper tape is used for the inner layer, fastening tape is used for the middle layer, and waterproof permeable plastic tape is used for the outer layer.Precautions for using SKF Bearing

Extra large NTN bearing:Precautions for using SKF Bearing

  • Single set of three-layer wrapping packaging (ditto); Single four layer wrapping packaging: after the above three layers of wrapping packaging, the outer layer is wrapped with a layer of linen tape.
  • For separable tapered roller NTN bearings with outer diameter ≥ 150mm, polyethylene film shall be padded before the inner and outer components, or the inner and outer components shall be packaged separately. For interchangeable cylindrical roller NTN bearings with outer diameter ≥ 150mm, because the complete package is easy to be damaged, the internal and external components can generally be packaged separately.
  • The general materials and requirements for the outer packaging of NTN bearings are as follows:
  • ① Double corrugated boxes, with the total weight (gross weight) of each box not exceeding 25kg, bound with plastic packing belts outside the box; ② Nail board box (wooden box), the total weight of each box shall not exceed 30kg, and the outside of the box shall be bound with bluing steel belt; ③ Calcium plastic corrugated box, the total weight of each box shall not exceed 25kg, and the box shall be bound with plastic packing belt.
  • When NTN bearing products with inner packaging are put into the box, plastic bags or plastic films shall be padded in the box first; If there is a gap in the box, it needs to be filled with corrugated paper blocks, paper scraps and other dry substances.