A) Current status and analysis of basic theoretical res […]
A) Current status and analysis of basic theoretical research on high-end rolling bearings
Before the 20th century, the manufacturing technology of rolling bearings mainly relied on experience, and there was little practical theoretical guidance.
The theoretical analysis method has been greatly developed in the middle and late 20th century.
Has a major guiding role. In order to meet the special needs of high-end machine tool bearings in terms of high speed, high precision, high reliability, etc.
The basic research work carried out by high-end machine tool bearings includes:
(1) Kinetic analysis technology
Rolling bearing dynamic analysis studies the relationship between the motion and load of bearing parts. Research on the dynamics of rolling bearings
There are four stages: static model, quasi-static model, quasi-dynamic model and dynamic model. The current design of bearings
Most of the calculations use quasi-static model and quasi-dynamic model. Dynamics compared with other rolling bearing analysis models
The model is more perfect in theory, but due to its complexity, the dynamic method is rarely used in practice. But in recent years, with the
The development of machine technology, the calculation method based on pure dynamic simulation has been applied in companies such as SKF.
(2) Bearing materials and heat treatment technology
In the field of high-end bearings, China's bearing industry has not been free from foreign monopolies. One of the biggest bottlenecks is the bearing
The raw materials and domestic bearing steel have made significant progress, and the basic materials have formed a certain system, but they are in line with the advanced foreign level.
In contrast, there are still significant gaps in the purity of steel, the fine dispersion of non-metallic inclusions, the uniformity of carbides, etc., and this is the first basic condition to ensure the long life and high reliability of bearing products. Especially for special types of bearing steel, the performance error of the material
There is still a certain gap between the belt and foreign products.
For special bearings and products in high-end fields, more than 90% of foreign companies manufacture their own special steel products.
Very good results have been achieved in the application. NSK has developed long-life and high-performance by devoting itself to the research on steel longevity technology
The main shaft bearing material: heat-resistant SHX steel. SHX steel has good resistance even under the condition of insufficient lubrication
Bite, wear resistance and long life. In the field of aviation, foreign countries have specially developed high-performance materials for engine spindle bearings, such as
Special bearing steels such as M50NiL, CSS-42L in the United States, Cronidur30 in Germany, and 3347 in Russia.
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