According to the investigation and analysis of the research results show that bearing steel and carbon steel shaft although the shape is not very different, but in essence their respective advantages and disadvantages are very obvious. The following is a specific survey and analysis results:
First, in terms of service life. Their use of life time is very different, bearing steel, long service life, many garbage bearings are carbon steel bearings, mainly hardness and wear resistance are not as bearing steel bearings.
Second, in terms of wear resistance. Low-carbon steel surface hardening only in the surface carburizing, and not all quenching. Many low-grade carbon steel bearings on the market is not quenching hard, very poor wear resistance.Third, in the process and the use of effects. Bearing the use of good or bad effects and the use of the environment, not to say that carbon steel bearing is not good, depending on which machinery to use, because some do not need high-grade, with carbon steel bearings on the right week. Of course, better but the cost of steel is much higher, the standard bearing steel is Gcr15.
Fourth, the bearing materials and performance. For example, the bearing rings and the rolling elements are subjected to high contact pressure repeatedly, and rolling contact is accompanied by sliding, while maintaining high-precision rotation.Therefore, the bearing rings, rolling and cage materials and performance to meet the following requirements: high elastic limit; high rolling fatigue strength; have high hardness; good wear resistance; toughness of the impact load; Dimensional stability. In addition, but also good processing. Proven, bearing steel has the above required performance, but the carbon steel bearings can not be guaranteed. Fifth, not to say that the advantages of carbon steel bearings have no bearing steel is good nowhere available, and this depends on where used. Carbon steel bearing noise, particularly short life expectancy, the pressure is particularly small, but can be used in the hardness, speed limits are relatively small place. Surface strengthening technology can form a variety of classification methods from different angles, according to the surface layer strengthening technology of physical and chemical process classification, can be divided into five categories: surface deformation strengthening, surface heat treatment strengthening, chemical heat treatment strengthening, surface metallurgy strengthening, surface film strengthen.
1, the bearing surface deformation strengthening
By mechanical means to the metal surface layer of plastic deformation, resulting in high hardness and high strength of the hardened layer, this method is called surface hardening surface strengthening, also known as work hardening. Including shot blasting, sandblasting, cold extrusion, rolling, cold grinding and impact, explosion and impact strengthening. Most of its methods have been applied in the bearing industry: the impact of the surface of the rolling body is the application of such methods, precision compaction has become a new processing and reinforcement methods.2, bearing surface heat treatment to strengthen