Regular inspection of the bearings.

The equipment is inspected regularly, the operation inspection and the bearings removed during the replacement of the peripheral parts are inspected, and the second time is judged whether it can be used again or the use condition is better or worse. Carefully investigate and record the removed bearings and appearance. In order to clarify and investigate the remaining amount of lubricant, the bearings should be cleaned well after sampling.


Next, check the condition of the raceway surface, the rolling surface and the mating surface, and the wear state of the cage, etc., for damage and abnormality.


To determine whether the bearing can be used again, it is necessary to consider the degree of bearing damage, machine performance, importance, operating conditions, inspection cycle, etc. If the bearing is found to be damaged or abnormal, the contents of the injury section will be identified and the countermeasures will be developed. In addition, the inspection results, if there are the following defects, the bearing can no longer be used, need to replace the new bearing.
 

    a. Cracks and fragments appear in any of the inner and outer rings, rolling elements, and cages.

    b. Any one of the inner and outer rings and the rolling elements are peeled off.

    c. The raceway surface, ribs, and rolling elements are significantly khocked.

    d. The cage is worn out or the rivets are loose.

    e. The raceway surface, rolling elements are rusted and flawed.

    f. There are significant indentations and marks on the rolling surface and rolling elements.

    g. Creep on the inner diameter of the inner ring or the outer diameter of the outer ring.

    h. Superheated and discolored.

    i. Grease seal bearing seals and dust caps are damaged.

 

  (1), in-service inspection and troubleshooting


The inspection items in operation include the rolling sound, vibration, temperature, and lubrication status of the bearing. The details are as follows:


 First, the rolling sound of the bearing

    The sounder is used to check the size and sound quality of the rolling sound of the running bearing. Even if the bearing is slightly peeled off, abnormal sounds and irregular sounds are emitted, which can be distinguished by the sounder.

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Bearing use

2.1 Precautions for use Rolling bearings are precision parts. Therefore, it is required to be cautious when using them. Even if high-performance bearings are used, if they are not used properly, the expected performance effects will not be achieved. Therefore, the following matters should be noted when using bearings. :
 

    2.1.1 Keep the bearings and their surroundings clean. Even if the smiling dust that is invisible to the naked eye enters the bearing, it will increase the wear, vibration and noise of the bearing.

    2.1.2 Care should be taken when using the installation. Strong stamping is not allowed. It is not allowed to directly hit the bearing with a hammer. It is not allowed to transmit pressure through the rolling elements. 2.1.3 Use appropriate and accurate installation tools, try to use special tools, and try to avoid the use of cloth and short fibers.
 

    2.1.4 Prevent the corrosion of the bearing. When taking the bearing directly by hand, wash off the sweat on the hand and apply it with high-quality mineral oil before handling. In the rainy season and summer, pay special attention to rust prevention.

 

    2.2 Cooperation

    2.2.1 Selection of the fit The inner diameter and outer diameter of the rolling bearing are manufactured according to standard tolerances. The tightness of the inner ring of the bearing and the shaft and the outer ring and the seat hole can only be achieved by controlling the tolerance of the journal and the tolerance of the seat hole. achieve. The inner ring of the bearing and the shaft are matched by a base hole, and the outer ring of the bearing and the seat hole are made by a shaft. The common fit of rolling bearings is shown in Figure 2-1. The correct choice of fit, you must know the actual load conditions, operating temperature and other requirements of the bearing, but it is actually very difficult. Therefore, most of the cases are based on the use of lint selection.
 

    2.2.2 Load properties The choice of coordination should first consider the rotation of the load vector relative to the ferrule. According to the rotation of the synthetic radial load vector with respect to the ferrule, the load on the ferrule can be divided into: fixed load, rotary load and oscillating load, as shown in Figure 2-2.
 

    a. The combined radial load acting on the ferrule by the fixed load is carried by the local area of ​​the ferrule raceway and transmitted to the corresponding local area of ​​the shaft or housing. This load is called a fixed load. It is characterized by a synthetic radial load vector and a relatively stationary ferrule. The ferrules that are subjected to directional loads can be loosely fitted.
 

    b. The combined radial load acting on the ferrule by the rotating load rotates in the circumferential direction of the raceway, which is sequentially carried by each part. This load is called the rotating load and is characterized by the synthetic radial load vector rotating relative to the ferrule. . The ferrules subjected to the rotating load should be tightly fitted. In special cases, such as the load is very light, or the ferrule only rotates at a low speed occasionally under heavy load. When the bearing is made of harder material and the surface roughness is higher, it is subjected to the rotating load. The ferrule can also be used with a loose fit.
 

    c. The direction of the synthetic radial load acting on the ferrule is uncertain. This load condition is called oscillating load or non-directional load. It is characterized by the synthetic radial load vector on the ferrule being fixed in the ferrule raceway. The swing in the area is carried by a certain area of ​​the raceway, or the load acting on the bearing is an impact load, a vibration load, a direction, and a load whose value frequently changes. The bearing in the bearing, the outer ring and the circumference, the bearing seat and the hole should be tightly matched by the oscillating load.
 

    2.2.3 Load size The amount of over-win between the ferrule and the shaft or casing depends on the size of the load. The heavier load uses a larger over-win, and the lighter load uses a smaller over-win. The equivalent radial load p is usually divided into three cases of “light”, “normal” and “heavy” load, and its relationship with the rated dynamic load c of the bearing is listed in Table 2-1 for the selection of the shaft and the seat hole tolerance band. reference.

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