Bearing knowledge (1)

Source: Bearing network time: 2018-07-19

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The first key rolling bearing for rolling bearings is a fine mechanical support component; bearing users eagerly expect bearings mounted on the mainframe to be damaged and adhere to their dynamic functions during the scheduled service period; but the objective facts are sometimes not perfect; Bearing failures will cause significant losses to the user. After many rolling bearing failure analysis studies indicate; bearing short life or premature loss accuracy; some are due to data defects or improper production; but to a considerable extent It is because the equipment is not strictly installed according to the requirements of bearing operation, or the bearing is not properly selected or the actual load exceeds the bearing's own additional load, etc., resulting in abnormal damage of the bearing; for example; the fatigue of the bearing parts is largely It is because of the impurities mixed in the smooth oil. It is visible; in order to complete the rolling bearing, it has a longer life and precision. In addition to the demand for the bearing manufacturer to improve the product quality; the bearing user must also use the scientific method and procedure to apply the bearing. Otherwise; no matter how good the bearings will be in the bad Premature death under conditions of intended use of.
The selection and substitution of rolling bearings in the first chapter. Whether the selection method and process can correctly select rolling bearings; whether the main machine can obtain outstanding working functions; extend the lifespan, whether the company can shorten the repair time; reduce the repair cost; improve the working rate of the machine; Therefore, whether it is depicting the production unit; it is still the repair and application unit; it must be highly valued when selecting rolling bearings; the selected procedures are shown in Figure 1.
Generally speaking, the process of selecting bearings can be summarized as:
1. According to bearing operating conditions (including load direction and load type, speed, smoothing method, coaxiality requirements, positioning or non-positioning, equipment and repair environment, ambient temperature, etc.); select the basic type of bearing, public service level and clearance,
2. According to the working conditions of the bearing and the force condition and the number of life requirements; the bearing type is determined by accounting; or according to the application requirements; the bearing type is selected;
3. Check the additional load and limit speed of the selected bearing.
The primary considerations for selecting a bearing are the limit speed, the exact life of the demand, and the load capacity; other factors help determine the end type of the bearing type, layout, dimensions, and level of service and clearance requirements.
1. Types of various types of rolling bearings have different characteristics; suitable for different operating conditions of various machines. When selecting bearing types;
Generally, the following elements should be considered. Under normal conditions: thrust bearings and angular touch bearings are used for thrust loads; ball bearings are usually used for high-speed applications; roller bearings are used for heavy radial loads; Should be from the same manufacturer, a lot of bearing products; choose the appropriate type.
The space and orientation of the bearing occupies the machine in the mechanical depiction; usually the dimensions of the shaft are first determined; then; the rolling bearing is selected according to the dimensions of the shaft. Usually the ball bearing is selected for the small shaft; the roller bearing is used for the large shaft. However, when the bearing is in the machine When the diameter direction is limited; use needle roller bearings, ultra-light and ultra-light series of ball or roller bearings, when the bearing is limited in the axial direction of the machine; you can choose a narrow or narrow series of balls or rolls Sub bearing.
The size, direction and nature of the load on the bearing are the most important elements of the choice of bearings. Roller bearings are used to accept heavier loads; ball bearings are used to accept lighter or medium loads; carburized steel or bainite Quenched bearings; acceptable shock and oscillating loads.

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