Currently, the commonly used matched bearings for machine tool spindles are angular contact ball bearings. Usually, complete sets of matched bearings are used. In some cases, non-complete sets of angular contact ball bearings may be used for universal matching. However, universal matching faces inconsistent accuracy. , inconsistent ruler time, inconsistent angle, etc., what are the universal matching requirements for angular contact ball bearings? And how to improve the matching accuracy? The following editor has compiled relevant content for you, hoping to be helpful to you.
What are the universal matching requirements for angular contact ball bearings?
When pairing angular contact ball bearings, in addition to relying on high-precision equipment during the production process to directly ensure the mutual differences in the inner and outer diameter groove dimensions, groove curvature, and groove position, the contact angle, the mutual difference in the inner and outer diameter dimensions, and the protrusion amount must also be ensured. Wait for the request.
1. Contact angle
The contact angle of universal matched angular contact ball bearings directly affects the stress state of the bearing under working conditions. The contact angle difference between two matched sets of bearings should be as small as possible. Generally, the contact angle difference between precision and ultra-precision matched bearings is About 1°. When selecting, the contact angle is controlled by controlling the radial clearance according to the relationship between the radial clearance and the contact angle.
cosβ= 1-Y/2 (Re+ Ri-2Rw)
In the formula:
β – contact angle
Y – radial clearance
Re – outer ring groove curvature radius
Ri – inner ring groove curvature radius
Rw – steel ball radius
As can be seen from the above formula, the difference in curvature radius of the inner and outer ring grooves can be effectively controlled during processing. Using the same set of steel balls for assembly can reduce the impact on the contact angle. Controlling the contact angle by fine-tuning the radial clearance can improve the angular contact Universal matching accuracy of ball bearings.
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More detailed information on the general fit requirements for angular contact ball bearings can be found here: https://www.lkwebearing.com/news-center/angular-contact-ball-bearing-matching-requirements.html