FAG universal joint bearing periodic inspection method

    Regular inspections of FAG bearings are important to maintaining the best condition of the universal joint bearings and can also reveal problems. Matters and related knowledge about the use of FAG bearings.
    First of all, we want to emphasize that it is important to keep the FAG bearings lubricated and clean.
Therefore, before we inspect the universal joint bearing, we should clean the surface of the FAG imported bearing and then remove the parts around the bearing. It should be noted that the oil seal is a very fragile part, so extra care should be taken during inspection and disassembly. Do not apply excessive force to avoid damage to the parts. Then carefully check the oil seal of the FAG bearing and its surrounding parts. If it has been shown to be a bad symptom, be sure to replace it. A bad oil seal will cause damage to the bearing, causing the FAG bearing to be abnormal and causing the machine to stop.
    Second, we also check the lubricant of the universal joint bearing.
Lubrication is very important, not only for FAG bearings, but also for all imported bearings. However, please note that it is not advisable to add too much grease to the bearings.
    The inspection method for FAG bearing lubricant is:
    Apply a little bit of lubricant to the two fingers. If there is any contaminant, feel it. Or apply a thin layer of lubricant on the back of the hand and check the seal.
    Then replace the lubricant of the universal joint bearing.
    FAG bearings lubricated with oil should be refilled with fresh oil and allowed to rotate at low speed for a few minutes if the old oil is drained. As much as possible, allow the oil to collect residual contaminants and then vent the oil. Note: It is best to filter the oil before use.
For grease-lubricated FAG bearings, when replacing grease, the cutter used should avoid any part of the FAG bearing with a cotton joint. Since these residual fibers may be wedged between the rolling elements and cause damage, especially the application of small bearings requires attention to this problem.
    Finally, it is important to note that the exposed FAG bearings are covered.
    When inspecting FAG bearings, never expose the bearings to contaminants or moisture. If the work is interrupted, the machine should be covered with a piece of oil-paper plastic or similar material.
    If the unshielded bearing is cleaned without performing disassembly and may be inspected, it should be cleaned with a white spirit with a brush for application, then dried with a lint-free cloth or blown dry with compressed air. (Be careful not to start the universal joint bearing assembly to rotate).

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The latest method of routine maintenance and maintenance of FAG sliding bearings

First, the bearing maintenance technology problems:

Two major complications related to FAG bearing maintenance technology are: 1. When to change oil. 2. How much oil should be changed? If the oil change is too small, the sliding bearing will be scrapped in advance; if the oil is changed too much, the bearing will be in trouble or the power coil and the coil will be damaged for a long time.

Second, the maintenance technology of the bearing:

The way to determine when to lubricate and when to stop oiling is simple: monitor when developing a baseline, setting up an observation schedule, and filling the oil.

1. Develop a basic line

The bearing base line reflects the decibel strength under normal operating conditions, no visible errors, and sufficient lubrication.

Three ways to develop a baseline:

  1), comparison method: If there are multiple bearings of the same type, these sliding bearings can be put together for comparison. Use the same test method or observe each bearing from the same angle. Analyze the decibel intensity and sound quality. If there is no essential difference (less than 8 decibels), we can set it to the base decibel strength of each bearing.

  2) Set the basic line when adding lubricating oil: When adding lubricating oil, listen to the intensity of the sound, and when the sound intensity drops, then rise again. At this time, do not add too much oil, and set it as the basic line.

  3) History: Observe the decibel strength of the FAG bearing, record it every day, and then compare the recorded results for 30 days. If the decibel intensity changes little or no (less than 8 decibels), we can set this as the baseline and use it for later comparisons.

2, set the observation timetable

Equipment criticality associated with total production, environmental results, and operational results is a major factor in selecting and setting up an evaluation mechanical system. It is very necessary to test once a month after the basic observation line is established. For high-decibel bearings that are to be lubricated, the frequency should be detected more frequently so that changes that may occur are observed. If a bearing is in a state of destruction, the lubricant can only temporarily cover up the error. However, the decibel intensity will rise quickly to show the existence of the error. In some cases, this phenomenon will appear in a few minutes, while others will take several days.

3. Detection during lubrication

If the decibel of a FAG bearing exceeds the base line by 8 decibels, we believe that this sliding bearing needs lubrication. When we realize that this bearing needs lubrication, knowing when to stop the oil will prevent over-lubrication. This can be done in the following three steps:

  1) Calculate the amount based on the guidance of the bearing manufacturer, then inject the lubricant, not too much. This step is very subjective and has nothing to do with ultrasound, and this step has never failed.

  2) Lubrication technicians use ultrasonic instruments to detect sliding bearings when injecting lubricant. Fill the oil slowly until the decibel strength drops to the baseline.

  3) If there is no basic line as a guide, the amount of lubricating oil should be stopped when the sound is lowered and then rises. At this time, the technician should stop using the lubricant.

4, ultrasonic bearing inspection

Ultrasonic inspection or monitoring is the most reliable way to detect the initial (first) bearing damage. When the temperature rises or the vibration intensity of the low frequency increases, the ultrasonic warning will sound first. This method of inspecting bearings is useful when the sliding bearing is damaged early due to overuse, lack of lubricating oil or excessive lubricant.

5, find the signal of failure

A spherical bearing like a metal on a track, such as a roller or a ball bearing that begins to overuse, undergoes subtle deformation. This situation creates an irregular surface that causes the emitted ultrasound to increase. The change in amplitude from the initial reading indicates one or two conditions: early failure or lack of lubricating oil and initial sliding bearing failure. If the ultrasonic wave exceeds the base line by eight decibels, there is a constant impact noise indicating that the lubricant has failed (dry FAG bearing surface). If the ultrasonic reading exceeds the expected reading and reaches 12 decibels, there will be a crashing noise that can be assumed to have begun to enter the failure mode.

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