Correctly select the use and maintenance method of IKO railway bearing
Correctly select the use and maintenance method of IKO railway bearing
2022年3月26日
Judge the fault of IKO clutch bearing through contact friction state
Judge the fault of IKO clutch bearing through contact friction state
2022年3月26日

How to Identify and Judge the Quality and Quality of Bearings

  • Bearing (abbreviated as rolling bearing) is a widely used and strict supporting and basic part in the mechanical industry. It is called the mechanical joint. The wide range of applications determines the diversity and complexity of bearing varieties. Due to strict requirements, it determines the importance of bearing quality and performance. 
  • Bearing manufacturing industry is a kind of precision basic parts manufacturing industry. Its accuracy is measured by 0.001 mm (mm), while the manufacturing tolerance of ordinary mechanical parts is generally only 0.01 mm. The noise and vibration of motor largely depend on the quality of bearing;How to Identify and Judge the Quality and Quality of Bearings
  • How to Identify and Judge the Quality and Quality of Bearings
  •  The swing difference and temperature rise of high-precision machine tool spindle are closely related to the quality of bearing. The bearing performance in the racemic device of communication satellite directly affects its communication effect; The failure of key bearings in aerospace and aviation will cause serious accidents. 
  • In short, the accuracy, performance, service life, reliability and various economic indicators of the main engine in various fields such as industry, agriculture, national defense, science and technology and household appliances are closely related to the bearing, and the development of the bearing industry is also related to the manufacturing level of China’s major technical equipment and the export capacity of mechanical equipment. 
  • Bearings are playing a more and more important role in the national economy and national defense construction.How to Identify and Judge the Quality and Quality of Bearings

How to Identify and Judge the Quality and Quality of Bearings

  • Gap measurement
  • The wear condition of the bearing is judged by measuring the radial and axial clearance of the bearing.
  • Radial clearance measurement: put the bearing on the flat plate, fix the dial gauge, and make the contact of the gauge against the outer ring of the bearing. Then, press the inner bearing race with one hand and push the outer bearing race back and forth with the other hand, and record the swing value of the gauge needle. Turn the bearing 90 ° and repeat the measurement in the same way. The larger value in the two measurements is the radial clearance of the bearing.
  • Axial clearance measurement: place the outer bearing race on two equal height sizing blocks, suspend the inner race, and place a flat plate on the inner race to make the dial indicator contact against the center of the small flat plate. Then, push the inner race up and down, and the large value of the dial indicator swinging upward is the axial clearance of the bearing.
  • After cleaning the rolling bearing, hold it in your hand and idle it. The rotation of the bearing should be light and flexible, mixed with crisp rustling sound, tight points, abnormal sound and uneven rotation of the bearing are not allowed. Judge the technical condition of rolling bearing through idling test.How to Identify and Judge the Quality and Quality of Bearings
Technical requirements for Timken non-standard bearing
  • Bearing is the lifeline of the machine, and the machine cannot operate without bearing. Therefore, selecting a good bearing is a necessary condition to ensure the normal operation of the machine. Here are some experience in judging and identifying the quality of bearings, that is, the methods of identifying and judging rolling bearings:How to Identify and Judge the Quality and Quality of Bearings
  •  Intuitively look at the bearing, you can first look at its finish (or roughness). If the quality is good, you can know it at a glance. There is no need to talk about it. Further, you can take the bearing in your hand and turn it hard to see if it rotates smoothly and naturally without noise.How to Identify and Judge the Quality and Quality of Bearings
  •  Generally used NSK 6xxxx series bearings are really easy to use, that is, the price is more than twice that of domestic bearings. But it has a long service life. Compared with most domestic bearings, one can top two. So the price is still cost-effective.How to Identify and Judge the Quality and Quality of Bearings
  • The following describes how to identify the quality of rolling bearings for motorcycle rolling bearings:
  • Appearance inspection
  • The rolling bearing shall be replaced or repaired if the following defects are found after inspection.
  •  There are cracks, metal delamination, scale peeling, scars, a large number of black spots on the ball, needle roller and inner and outer ring raceways, and the original luster has been changed due to ablation.
  •  There are penetrating cracks on the isolating ring, lack of rivets or loose rivets.How to Identify and Judge the Quality and Quality of Bearings
  • 3. The notch of the ball installed on the isolation ring is seriously worn, and the ball can fall out by itself, or the wear depth of the end face of the isolation ring exceeds 0.3mm.How to Identify and Judge the Quality and Quality of Bearings