FAG bearing limit speed detection requirements and treatment methods

Core Tip: The limit speed of FAG bearings is the limit value that does not produce frictional heat that causes burns and can be continuously rotated. FAG bearing limit speed is subject to FAG bearing size, type, lubrication, precision
The limit speed of a FAG bearing is a limit value that does not cause frictional heating that causes burns and can be continuously rotated. FAG bearing limit speed is affected by FAG bearing size, type, lubrication, accuracy, oil gap, load and other factors, but the most important is the effect of lubricant and ambient temperature. At high speeds, especially when the speed is close to or exceeds the limit speeds stated in the dimension table, the following should be noted:
(1) use high precision FAG bearings;
(2) Analyze the internal clearance of the FAG bearing, and consider the reduction of the internal clearance of the FAG bearing caused by the temperature rise;
(3) Analyze the lubrication method. Lubrication methods such as cycle lubrication, jet lubrication, oil mist lubrication and oil and gas lubrication for high-speed rotation are adopted.
(4) Analyze the type of material of the cage. For high speed rotation, it is suitable to cut the cage with copper alloy or phenolic resin. There are also synthetic resin molded cages suitable for high-speed rotation;
For small machines, you can rotate by hand to confirm that the rotation is smooth. Inspection items include:
1. Whether there is any poor operation caused by foreign objects, scars and indentations;
2. Whether the torque generated by the poor processing of the mounting seat is unstable due to poor installation;
3. Whether there is excessive torque caused by too small clearance, installation error, sealing friction, etc.
If there is no above abnormality, you can start the power running.
However, it cannot be rotated manually for large machines. Therefore, immediately after the no-load start, the power is cut off, the machine is idling, and the presence or absence of vibration, noise, and whether the rotating parts are in contact with each other is checked. After confirming that there is no abnormality, the power is turned on.
The power running is started from the low speed at no load and slowly increases to the rated operation of the specified conditions. Check items during the test run include: abnormal sound, FAG bearing temperature change, lubricant leakage or discoloration, etc. If an abnormality is found, stop the operation immediately, check the machine, and remove the bearing check if necessary.
FAG bearing temperature check. Usually based on the external temperature of the housing. However, it is more accurate to directly measure the temperature of the outer ring of the bearing by using the oil hole. The temperature of the FAG bearing gradually increases from the start of the operation, and the temperature is usually stable after 1 to 2 hours.
If the FAG bearing is poorly installed, the temperature will rise sharply and an abnormally high temperature will occur. The reasons are such as excessive lubricant, too small bearing clearance, poor installation, excessive friction of the sealing device, and the like. In the case of high-speed rotation, the FAG bearing structure and the selection of the lubrication method are also the reasons.
FAG bearing sound check. The rotation sound is checked with a stethoscope, etc., and if there is strong metal noise, abnormal sound, irregular sound, etc., the abnormality is explained. The cause of noise is poor lubrication, poor accuracy of the shaft or FAG bearing housing, bearing damage, and foreign matter intrusion.
    (1) The method of using chemical additives, adding certain chemical additives to the lubricating oil can reduce the noise of the bearing. For example, the additive noise of low-noise grease produced by the same factory in Tianjin can be reduced by 3.9. The bearing noise, 9.2 dB, is suitable for miniature and small bearings.

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How to use and lubricate KOYO bearings

Core Tip: Proper lubrication of KOYO bearings' anti-friction bearings is critical to their successful operation. For ordinary or sleeve type bearings, there are different principles in different practices.
Proper lubrication of KOYO bearings' anti-friction bearings is critical to their successful operation. For ordinary or sleeve type bearings, there are different principles in different practices. In order for the party to maintain anti-friction bearings, these principles must be understood and applied.
[a] size limit. KOYO bearings usually have limited installation space. In most cases, the shaft (or bearing inner diameter) is based on mechanical design or other design limitations. Therefore, the choice of bearing type and size is based on the inner diameter of the bearing. Therefore, the main bearing size table is based on the size and preparation of the diameter table in the international scope.
   There are a variety of forms, preferably in the use of mechanical devices, designed to measure bearings (the purpose is to easily purchase the bearing, in which it is placed on one side, some bearing catalogue entry models, but some non-standard bearings in mainland China KOYO bearing size size China, no spot, futures will be very long, sometimes, let time to consider the choice of bearings and the capital after replacement) Bearing load, its properties apply to the bearing load, size, direction is constantly changing . Normally, the basic load rating is shown in the size of the table. However, axial and radial loads, etc., are also an important factor in bearing selection. When the size of the ball and needle bearings, needle bearings, usually have a higher load capacity and withstand greater vibration and shock loads.
  [B], speed, KOYO bearing type, size, accuracy, cage, load, lubrication, cooling method and other factors determine the speed based on the promise. The table lists the precision bearings and greases in the lubricant scale, according to the agreed speed. Normally, deep groove ball bearings, self-aligning ball bearings and cylindrical roller bearings are used for high speed operation.
   [C], KOYO bearing tolerances, dimensional accuracy and rotational accuracy of bearings are based on the International Organization for Standardization (ISO) and JIS scale. For high precision and high speed machinery, it is recommended to use 5 or more precision bearings, deep groove ball bearings, angular contact ball bearings or cylindrical roller bearings for high running precision and mechanical. Elastic deformation occurs when the contact pressure between the rigid body and the moving bearing raceway. Some machines require less elastic deformation. Has a small elastic deformation than a ball bearing roller bearing
   [four], and in some cases, KOYO bearings pre-tightening to increase rigidity. This process is commonly used for deep groove ball bearings, angular contact ball bearings and tapered roller bearings with inner ring offset, shaft bending, shaft or housing tolerance changes, and inner and outer rings with errors that will result in eccentricity. In order to prevent excessive degrees, the eccentric angle of self-aligning ball bearings, self-aligning roller bearings, spherical bearings is a better choice. Voice frequency and torque, the production scale of moving bearings is highly accurate, and therefore, voice and torque are small. Deep groove ball bearings and cylindrical roller bearings combine low sound and have special requirements for low torque applications.
 [5], installation and removal, some applications often need to be disassembled and installed to ensure testing and maintenance. Can be installed inside and outside, such as bearing ring: cylindrical roller bearing, needle bearing, tapered bearing combined in this occasion. Self-aligning tapered bore and self-aligning ball bearings in the cylindrical sleeve roller bearings also simplify the installation process.

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