In the development and application of engineering ceramic products, ceramic ball bearings are a typical example of engineering ceramics widely used in the industrial field, and are highly valued by many countries. Among the high-speed precision bearings, the most widely used is hybrid ceramic ball bearings, that is, the rolling elements use hot-pressed Si3N4 ceramic balls, and the bearing rings are still steel rings. This bearing has a high degree of standardization, small changes to the machine tool structure, easy maintenance, and is particularly suitable for high-speed operation occasions. The assembled high-speed electric spindle has the advantages of high speed, high rigidity, high power and long life.
The advantages of ceramic ball bearings:
1. High temperature resistance
The thermal expansion coefficient of the ceramic ball is small, and the bearing ball will not expand due to temperature in a high temperature environment, which greatly improves the use temperature of the entire bearing. The temperature of the ordinary bearing is about 160 degrees, and the ceramic ball can reach more than 220 degrees.
2. High speed
Ceramic balls have oil-free self-lubricating properties, and the friction coefficient of ceramic balls is small, so ceramic ball bearings have a very high speed. According to statistics, the bearings using ceramic balls are 1.5 times the speed of general bearings.
3. Long life
The ceramic ball can be added without any grease, that is to say, even if the grease is dried, the bearing can still operate, so that the premature bearing damage caused by the dried grease in the ordinary bearing can be avoided. According to our test and feedback from some customers The service life of bearings after ceramic balls is 2-3 times that of ordinary bearings.
4. Insulation
The last point is also the most important point. Insulation. Bearings with ceramic balls can insulate the inner and outer rings of the bearing. Because ceramic balls are insulators, using ceramic balls between the inner and outer rings of the bearing can achieve the effect of insulation. This allows the bearing to be used in a conductive environment. Rolling bearings are composed of rings, rolling elements, retainers, grease, and seals. When the rolling elements are made of ceramic materials, the rolling bearings are defined as ceramic ball bearings.