At present, the most widely used high-speed main shaft bearing is the mixed ceramic ball bearing, that is, the rolling element uses hot pressed or hot isostatic pressed Si3N4 ceramic balls, and the bearing ring is still a steel ring. This bearing has high standardization, low price, small changes to the machine tool, easy maintenance, and is especially suitable for high-speed operation occasions. Its D · n value has exceeded 2.7 × 106。 In order to increase the service life of the bearing, the wear resistance of the raceway can be increased, and the raceway can be coated or other surface treatments.
There is no certain order and rule for the selection of bearings. The priority should be given to the conditions, performance and most relevant matters required by the bearings, which is especially practical.
Rolling bearing is a precision component, and its use must be carried out with caution. No matter how high-performance bearings are used, if they are not used properly, the expected high performance will not be obtained. Precautions for the use of bearings are as follows.
a. Keep the bearing and its surroundings clean.
Even small dust that cannot be seen by the eyes will have a bad effect on the bearing. Therefore, keep the surrounding clean so that dust will not invade the bearing.
b. Use with care.
Strong impact on the bearing during use will produce scars and indentation, which will become the cause of the accident. In serious cases, cracks and fractures may occur, so attention must be paid to them.
c. Use appropriate operating tools.
Avoid replacing with existing tools, and use appropriate tools.
d. Pay attention to bearing corrosion.
When operating the bearing, the sweat on the hand will become the cause of rust. Pay attention to clean hands and try to wear gloves.
In order to maintain the original performance of the bearing in good condition for as long as possible, it is necessary to maintain and overhaul the bearing in order to prevent accidents, ensure the reliability of operation, and improve productivity and economy.
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