Want to further improve the precision of the bearing? What should the manufacturer do?

Bearing precision is a key indicator to determine the quality of bearings, which is very important in many times. However, it is difficult to improve the precision in this aspect. However, as a relevant manufacturer, these skills are very important. So this issue will briefly share the relevant skills.

1. Regulations on accessories of precision bearings

Because the precision of precision bearing is 1 μ M Therefore, the stainless steel bearing manufacturer requires that the accessories (shaft, bearing seat, end cover, retaining ring, etc.) have high specification accuracy and shape accuracy, especially the accuracy of the mating surface should be kept at the same level as the bearing, which is very important, and Z is easily ignored - electric tool bearing.

It must also be noted that if the matching parts of the precision bearing do not meet the above requirements, the error of the precision bearing after use is often many times larger than that of the original bearing, or even more than 10 times. It is not a precision bearing at all, because the error of the matching parts is often not simply accumulated on the error of the bearing, but added after amplification with different multiples.

2. Fit of precision bearing

In order to ensure that the bearing will not produce excessive deformation after installation, it is necessary to:

(1) The roundness of the shaft and the seat hole and the perpendicularity of the shoulder shall be determined according to the corresponding accuracy of the bearing.

(2) It is not only necessary to accurately measure the interference of the rotating ferrule fitting, but also to measure the appropriate fitting amount of the fixed ferrule.

In the possible range, the combustion excess of rotating ferrules should also be smaller. As long as the ceramic bearing manufacturer can effectively ensure the influence of thermal expansion at working temperature and cohesion at high speed, it will not produce creeping or overturning that closely matches with the surface. The fixed collar is selected according to the working load size and bearing specification, especially small clearance or excess fit. Too loose or too tight is not conducive to maintaining the original shape.

(3) If the bearing operates at high speed and the operating temperature is high, special attention should be paid to the fitting of the rotating collar should not be too loose to avoid eccentric vibration, and the fitting of the fixed collar should not have clearance to prevent the collar from deformation under load and causing vibration.

(4) The fixed ring of non-standard full ball bearing manufacturer selects small interference fit on the condition that the shape accuracy of the mating surfaces is high and the roughness is small. Otherwise, it is difficult to install and disassemble. In addition, attention should also be paid to the influence of thermal elongation of the main shaft.

(5) Most of the spindles of double angular contact ball bearings have light loads. If the fit interference is slightly larger, the axial preload will be significantly larger, causing adverse effects. The spindle load of double-row short cylindrical roller bearing and tapered roller bearing is relatively large, so its fit interference is also relatively large.