The inner and outer rings and rollers of cylindrical roller bearings are usually made of high carbon chromium bearing steel and are commonly used for medium and large machine tools with relatively low speeds. However, it is not suitable for working conditions requiring high speed, high stiffness, wear resistance, low temperature rise, long life and high reliability.
In order to meet the requirements of high speed, high rigidity, long life high speed medium and heavy precision machinery, cylindrical roller bearings are structurally improved and optimized from the following aspects, and high precision hybrid ceramic cylindrical roller bearings are developed.
1. The ring is designed for high speed, high stiffness, wear resistance and long life performance, and improves the bearing rib structure and the gap between the roller end face and the rib to reduce friction and wear and reduce the temperature rise between the roller end faces and the ribs.
2. According to the elastic modulus, Poisson's ratio, stress intensity and hardness of silicon nitride ceramic material, the main parameters are optimized, and the arc-corrected linear shape or the logarithmic linear roller crown is designed.
3. Lubrication of ordinary cylindrical roller bearings is fuel injection or grease lubrication. According to the actual working conditions of high-speed hybrid ceramic cylindrical roller bearings, the problem of irregular heating caused by uneven lubrication of high-speed working is solved by oil-air lubrication or minimum drip lubrication.
It has been proved by experiments that high-precision hybrid ceramic cylindrical roller bearings have advantages in terms of speed limit and service life.
The inner and outer ring material is a high hardness bearing steel roll material is ceramic. Compared with standard steel cylindrical roller bearings of the same size, it has high speed performance, high rigidity, low friction and heat generation, long life and high reliability, which can significantly improve precision machinery speed, rigidity and reliability. Precision machinery reduces the friction and heat of the spindle and extends the life of the mainframe.
