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Installation of angular contact ball bearings

wallpapers News 2021-09-01
Installation of angular contact ball bearings
High-speed precision angular contact ball bearings are mainly used for high-speed rotating occasions with lighter loads, requiring high precision, high speed, low-temperature rise, low vibration, and certain service life. They are often used in pairs as support parts for high-speed electric spindles and are key components of high-speed electric spindles for internal surface grinding machines.
Mounting form
Angular contact ball bearings are installed in back-to-back, face-to-face, and tandem arrangements.
Back-to-back form (the wide end faces of the two bearings are opposite) when installed, the contact angle line of the bearing spreads along the direction of the rotary axis, which can increase its radial and axial support angle rigidity and has the greatest resistance to deformation.
Face-to-face form (two bearings of narrow end face opposite) when installed, the contact angle line of the bearing towards the direction of the rotary axis convergence, its support angle rigidity is smaller. As the inner ring of the bearing extends out of the outer ring when the outer rings of the two bearings are pressed together, the original clearance of the outer ring is eliminated, which can increase the preload of the bearing.
Tandem arrangement form (two bearings with wide end face in one direction) when installed, the contact angle line of the bearing is the same and parallel, which can make two bearings share the working load in the same direction. But when using this mounting form, in order to ensure the axial stability of the installation, two pairs of bearings in tandem arrangement must be installed opposite to each other at both ends of the shaft.
Angular contact ball bearing main technical indicators.
1. bearing precision index: more than GB/307.1-94 P4 level precision
2. High-speed performance indicators: dmN value 1.3~1.8x 106 /min
3.Service life (average): >1500 h
High-speed precision angular contact ball bearing service life has a great relationship with the installation, should pay attention to the following matters
1. the bearing installation should be carried out in a dust-free and clean room, the bearing should be carefully matched, the spacer for the bearing should be ground, and the parallelism of the spacer should be controlled below 1um under the premise of keeping the spacer of the inner and outer rings equal in height.
2. the bearings shall be cleaned before installation, cleaned with the inner ring slope facing upward, with flexible hand sensing and no stagnation, dried, and put into the specified amount of grease, such as oil mist lubrication shall be put into a small amount of oil mist oil
3. the bearings should be installed with special tools, with even force, and knocking is strictly prohibited
4. the bearings should be stored in a clean and ventilated place with no corrosive gas and relative humidity not exceeding 65%. long-term storage should be regularly anti-rust.

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