KOYO bearing inspection and judgment, cleaning, replacement

    Cleaning of KOYO bearings: When disassembling KOYO bearings, first record the appearance of KOYO bearings, confirm the residual amount of lubricants, and then wash the KOYO bearings after sampling the lubricants for inspection. As a cleaning agent, gasoline and kerosene are commonly used. The cleaning of the removed KOYO bearings is divided into coarse cleaning and fine cleaning. They are placed in the container respectively, and the metal mesh bottom is placed first so that the KOYO bearing does not directly contact the container. In the case of rough cleaning, if the KOYO bearing is rotated with dirt, it will damage the rolling surface of the KOYO bearing and should be noted. In the rough cleaning oil, use a brush to remove the grease and the adhesive. After it is almost clean, it is transferred to the fine wash. Fine washing is to carefully clean the KOYO bearing while rotating in the cleaning oil. In addition, the cleaning oil should always be kept clean.
Inspection and judgment of KOYO bearings: In order to judge whether the removed KOYO bearings can be used, check them after cleaning the KOYO bearings. Check the condition of the raceway surface, the rolling surface, the mating surface, the wear of the cage, the increase of the KOYO bearing clearance, and the damage and abnormality that are irrelevant in dimensional accuracy. For non-separable small ball KOYO bearings, use one hand to support the inner ring horizontally and rotate the outer ring to check if it is smooth.
     Separate KOYO bearings such as tapered roller bearings can be inspected separately for the rolling surfaces of the rolling elements and the outer ring. 2 Large KOYO bearings can not be rotated by hand. Pay attention to the appearance of rolling elements, raceway surfaces, cages, ribs, etc. The higher the importance of KOYO bearings, the more careful inspection is required.
The judgment of KOYO bearing reusable (KOYO bearing replacement) is determined by considering KOYO bearing damage degree, mechanical performance, importance, operating conditions, and the period of next inspection. However, if you have the following defects, you can no longer use them. You must replace the new KOYO bearings:
(a) cracks or notches on any of the inner ring, the outer ring, the rolling elements, and the cage;
(b) rupture on any of the ferrules and rolling elements;
(c) Significant jams on the raceway surface, ribs and rolling elements;
(d) the cage is worn significantly or the rivet is significantly slack;
(e) There is rust and injury on the raceway surface and the rolling elements;
(f) There are severe indentations and marks on the raceway surface and rolling elements;
(g) The inner diameter of the inner ring or the outer diameter of the outer ring has obvious creep;
(h) discoloration due to heat;
(i) KOYO bearings sealed with grease, and the seal or dust cover is damaged.

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How to check the fault of SKF bearing during operation

    1. First of all, according to the sound of SKF bearing rolling to identify and check
    We can use a sounder to check the size and sound quality of the running SKF bearing rolling sound. Because SKF bearings emit abnormal sounds and irregular sounds even if they are slightly peeled off, they can be distinguished by the sounder, which can prevent them in advance.
    2. Secondly, the vibration of the SKF bearing at work to identify the inspection
    SKF bearing vibration is very sensitive to bearing damage. For example, peeling, indentation, rust, cracks, abrasion, etc. are reflected in the vibration measurement of SKF bearings. Therefore, the vibration can be measured by using a special SKF bearing vibration measuring device (frequency analyzer, etc.). It is not possible to deduce the specific circumstances of the anomaly. The measured values ​​vary depending on the conditions of use of the bearing or the mounting position of the sensor. Therefore, it is necessary to analyze and compare the measured values ​​of each machine in advance to determine the judgment standard.
    3. Finally, check according to the temperature of the SKF bearing
    The temperature of the SKF bearing is generally estimated based on the temperature outside the SKF bearing. If the oil hole can directly measure the bearing outer ring temperature, it is more suitable.
    Usually, the temperature of the SKF bearing rises slowly as the operation starts, and reaches a steady state after 1-2 hours. The normal temperature of SKF bearings varies with the heat capacity, heat dissipation, speed and load of the machine. If the lubrication and installation parts are suitable, the bearing temperature will rise sharply and abnormal temperature will occur. At this time, it is necessary to stop the operation and take necessary precautions. Based on a large amount of test data, Table 4-1 lists the average value of the outer ring temperature when the bearings are working in various machines for reference. Since the temperature is affected by lubrication, speed, load, and environment, the values ​​in the table only indicate the approximate temperature range. The thermal sensor can be used to monitor the working temperature of the bearing at any time, and automatically alarm the household when the temperature exceeds the specified value or stop the occurrence of the burning shaft accident.

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