What should be paid attention to to to prevent IKO joinWhat should be paid attention to to to prevent IKO joint bearing failuret bearing failure
What should be paid attention to to to prevent IKO joint bearing failure
2022年4月8日
Basic Precautions for Grease Storage
Basic Precautions for Grease Storage
2022年4月9日

Problems needing attention in inspection of bearing temperature rise of ina flange

  • Improper operation
  • Cause: improper installation, operation or disassembly may cause deformation or damage to the cage
  • Suggestion: use proper operation, installation and removal tools
  • Insufficient lubrication
  • Cause: insufficient or improper lubrication may cause component scratch or serious INA Bearing deformation
  • Suggestion: improve the lubrication system and replenish or replace the lubricant regularly and properly
  • Rust and corrosion
  • Cause: contact with water may cause corrosion and rust of pump shaft bearing elements. Rusted and damaged bearings may cause spalling during operation
  • Suggestion: check the seal regularly to ensure good sealing effect, and store ina imported bearings correctly
  • electric current
  • Cause: energizing during rotation may cause grooves or nicks. When the bearing is stationary, improper grounding of electrical operation will cause slight burns
  • Recommendation: before welding components other than INA Bearing, reduce or avoid current through the bearing through appropriate grounding connection
  • External materials
  • Cause: abrasive particle contamination and debris intrusion may cause wear, scratches and dents on the working surface of the inlet bearing
  • Recommendation: remove invading particles and debris, change lubricant and check sealing system
  • Cause: eccentricity, inclination or excessive load may lead to geometric stress concentration or surface spalling
  • Suggestion: accurately process ina imported bearing seat and shoulder
  • After the ina bearing is installed, in order to check whether the installation is correct, the operation inspection shall be carried out. Small machinery can be rotated by hand to confirm whether it rotates smoothly. 
  • The inspection items include poor operation caused by foreign matters, scars and indentation, unstable torque caused by poor installation and poor processing of mounting base, excessive torque caused by too small clearance, installation error and sealing friction, etc. If there is no abnormality, the power operation can be started.Problems needing attention in inspection of bearing temperature rise of ina flange
  • Power operation, starting from no-load and low speed, slowly increase to the rated operation under the specified conditions. During the test run, the inspection items are whether there is abnormal sound, the temperature change of water pump shaft and bearing, the leakage or discoloration of lubricant, etc. Problems needing attention in inspection of bearing temperature rise of ina flange
  • If any abnormality is found, stop the operation immediately, check the machinery, and remove the INA Bearing for inspection if necessary.Problems needing attention in inspection of bearing temperature rise of ina flange
Problems needing attention in inspection of bearing temperature rise of ina flange
  • Prevention of assembly foreign matters: 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 the 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. Problems needing attention in inspection of bearing temperature rise of ina flange
  • If more oil or grease is accumulated in the bearing chamber, it is easy to enter the INA Bearing along the shaft when the water pump shaft and bearing rotate. The bearing chamber 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.Problems needing attention in inspection of bearing temperature rise of ina flange
  • Prevention of paint rust: paint rust is often found in sealed motors. The sound of the motor is very good during assembly, but after being placed in the warehouse for some time, the abnormal sound of the motor becomes very large, and there is serious rust when removing the shaft and bearing of the water pump. In the past, many manufacturers thought it was the bearing problem. Problems needing attention in inspection of bearing temperature rise of ina flange
  • After our continuous publicity, now the motor factory has realized that the main problem is the insulating paint. This problem is mainly because the acid substances volatilized from the insulating paint form corrosive substances at a certain temperature and humidity, which corrodes the bearing channel and leads to the damage of INA Bearing. At present, the problem can only be to select good insulating paint and assemble after drying and ventilation for a period of time.Problems needing attention in inspection of bearing temperature rise of ina flange
  • Selection and control of shaft and bearing housing tolerance: the water pump shaft and bearing shall rotate flexibly without blocking feeling after being pressed into the bearing. If there is obvious inflexible rotation, it indicates that the size of the shaft is too large and the tolerance should be reduced.
  •  If there is an obvious “rusty” feeling when the water pump shaft is rotated by hand after being pressurized into the shaft, it may be that the tolerance of the shaft is too large or the roundness of the shaft is not good. Therefore, when controlling the tolerance of shaft and bearing chamber, it is also necessary to control the roundness. At present, many domestic manufacturers only control the tolerance, not the roundness.Problems needing attention in inspection of bearing temperature rise of ina flange
  • Bearing assembly method: because the bearing is a high-precision product, if it is improperly assembled, it is easy to damage the water pump shaft bearing channel, resulting in ina bearing damage. The bearing shall be equipped with a special mold during assembly, which cannot be knocked at will.Problems needing attention in inspection of bearing temperature rise of ina flange
  •  When pressing the shaft, only the small ring can be stressed, and when pressing the large ring, only the large ring can be stressed. Air pressure or hydraulic pressure is required during assembly. During press assembly, the upper and lower touch shall be outside the horizontal state. If there is inclination, the bearing channel will be damaged due to stress and the bearing will produce conduction sound.
  • The service life of ina bearing is closely related to manufacturing, assembly and use. It must be done well in each link to make the water pump shaft and bearing in the running state, so as to prolong the service life of the bearing.
  • The main reasons for the increase of bearing temperature are:
  • : is the quality of lubricating oil deteriorated? If the viscosity of lubricating oil is high, the temperature of INA Bearing will also rise;Problems needing attention in inspection of bearing temperature rise of ina flange
  • Second: if the assembly of bearing mechanism is too tight and the clearance is insufficient, the temperature of flange bearing will also rise;
  • Third: too tight bearing assembly will also lead to the increase of bearing temperature;
  • Fourth: the rotation of bearing race on the shaft or in the shell will also lead to the increase of bearing temperature;
  • Fifth: excessive bearing load will also lead to the increase of bearing temperature;
  • Sixth: if the bearing cage or rolling element is broken, it will also cause the bearing temperature to rise.Problems needing attention in inspection of bearing temperature rise of ina flange
Methods and diagnostic techniques for identifying whether ina non-standard bearings can be reused
  • After the bearing is pressed into INA Bearing, it shall rotate flexibly without blocking feeling. If there is obvious inflexible rotation, it indicates that the size of the shaft is too large and the tolerance should be reduced. If there is an obvious “rusty” feeling when the imported bearing is pressed into the shaft by hand, it may be that the tolerance of the shaft is too large or the roundness of the shaft is not good.Problems needing attention in inspection of bearing temperature rise of ina flange
  •  Therefore, when controlling the tolerance of shaft and bearing chamber, it is also necessary to control the roundness. At present, many domestic manufacturers only control the tolerance, not the roundness.Problems needing attention in inspection of bearing temperature rise of ina flange
  • Because the flange bearing is a high-precision product, if it is not assembled properly, it is easy to damage the bearing channel, resulting in bearing damage. INA Bearing shall be equipped with special mold during assembly, and can not be knocked at will. 
  • When pressing in 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.Problems needing attention in inspection of bearing temperature rise of ina flange
  • When the bearing is installed on the rotor for dynamic balance, it is easy to put the iron filings generated during dynamic balance into the INA Bearing, so it is necessary to perform dynamic balance before installing the imported 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. Problems needing attention in inspection of bearing temperature rise of ina flange
  • If more oil or grease is accumulated in the bearing chamber, it is easy to enter the flange bearing along the shaft when the bearing rotates. The bearing chamber 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.Problems needing attention in inspection of bearing temperature rise of ina flange
  • 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 has been put in the warehouse for some time, the abnormal noise of the motor becomes very large, and there is serious rust when the ina bearing is removed. In the past, many manufacturers thought it was the problem of flange bearing. 
  • 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. At present, the problem can only be to select good insulating paint and install it after drying and ventilation for a period of time
Methods and diagnostic techniques for identifying whether ina non-standard bearings can be reused