Method for adjusting pre-tightening amount adjustment eccentric bearing

    Bearings in the installation process to control the preload is mainly angular contact ball bearings, eccentric bearings, tapered roller bearings, tapered double row cylindrical rollers, etc., in the final stage of these types of bearing installation, it is more accurate Adjust the clearance, that is, control the preload amount (load), especially for the shafting system that has strict requirements on the rotation accuracy, noise and temperature rise of the machine tool spindle, not only the preload amount (load) adjustment clearance should be controlled during the initial installation. And also need to adjust in use. There are many pre-tightening control methods. The following are several methods for controlling the pre-tightening amount to adjust the play.
    (1) Measuring the starting friction torque of the eccentric bearing, pre-measuring the relationship between the starting friction torque of the bearing and the axial load, and controlling the starting friction torque to adjust the pre-tightening amount, which is often used for the axial direction of the pair of tapered roller bearings installed. Preload
    (2) Measuring the axial displacement of the bearing, pre-measuring the relationship between the axial load and the axial displacement of the eccentric bearing for the tapered bore bearing, and adjusting the preload by controlling the axial displacement
    (3) Measuring the deformation amount of the preload spring, measuring the relationship between the load and the deformation of the spring in advance, and controlling the deformation amount to adjust the load of the constant pressure preload
    (4) Measure the tightening torque of the nut. When pre-tightening the bearing with a nut, adjust the pre-tightening amount with the tightening torque of the control nut.
    (5), using the bearing end cover padding, will cause one end to tighten, the other end bearing does not put the gasket first, tighten the screw, when the shaft is not free to rotate, it shows that there is no play in the shaft system, with thickness gauge, etc. Measure the gap between the end cap and the end of the bearing housing. Add this value to the required clearance value.
    (6), using the middle spacing sleeve, the length of the inner ring spacer can be calculated from the length of the outer ring spacer of the bearing and the supporting size. It can also be measured to determine the preloading load of the eccentric bearing. It is difficult to detect with a few special instruments. In addition, most of them use the dial gauge to measure the axial direction of the shaft, the radial displacement or the measured starting friction torque. Some foreign bearing companies use the special instrument and some structure to pre-tighten the pre-tightening load at the optimum value. The load is detected and adjusted to achieve pre-loading control.

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Detailed explanation: FAG bearing materials

  The performance of rolling bearings is highly dependent on their material properties. FAG usually uses low-alloy, high-purity, integrally-tempered chrome steel as the material for the manufacture of bearing rings and rolling elements. For bearings bearing high impact loads and alternating bending stresses, carburized steel is used.
In recent years, FAG has been able to significantly increase the bearing capacity of its bearings due to the continuous improvement in the quality of bearing steels (of course, the price is also rising). Research results and practical experience have proven that today's standard rolling bearing steel bearings can achieve unlimited fatigue strength under good lubrication, clean environment and low load.
The heat treatment process of the FAG rolling bearing ring and the rolling element ensures that the bearing is within 150 degrees and the size is stable. For higher operating temperatures, special heat treatment methods are required. If the bearing is used in a corrosive environment, the bearing steel is required to be corrosive. Standard bearings made of stainless steel are prefixed with "S" and suffix "W203B". This bearing is identical to the main dimensions and load carrying capacity of the overall hardened bearing steel bearing. In order to maintain its corrosion resistance, its surface cannot be damaged during installation and use. FAG produces silicon nitride balls for ceramic spindle bearings. Ceramic balls are much lighter than steel balls, and centrifugal force and friction are also significantly smaller than steel balls. This type of bearing can still reach extremely high speeds during grease lubrication, and has a long service life and low operating temperature.

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