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FAG bearing processing

As we all know, in the process of bearing processing, bearing steel only undergoes three higher temperature (above 800 ℃) processing processes: hot rolling forming, forging forming and heat treatment bainite quenching process. Generally speaking, in the three heating processes, the heat treatment quenching heating temperature is lower than the forging temperature and the hot rolling forming temperature. The qualified organization rating of the magnetic trace bearing ring proves that there is no overheating during the heat treatment process, so the holes in the FAG bearing ring should not be generated during the heat treatment process.

Forging over-firing will cause the grains of bearing steel to grow. In severe cases, not only the surface metal grain boundaries are oxidized and cracked, but also in areas where the internal components of the metal are segregated seriously, the grain boundaries also begin to melt, forming sharp-pointed holes. If the forging of the bearing steel causes holes in the finished ring structure, there are also two situations:

(1) Within the specified temperature range of the process, severe segregation of local tissue on the ferrule causes local overburn;

(2) Too high forging temperature causes the grains of the entire ferrule to grow, the grain boundaries begin to melt, and holes are formed in the structure.

In the above two cases, the growth of grains in the area where the hole is located is inevitable. Therefore, when the fracture of the forged burned area is observed, there are generally shimmering crystal grain edges, called stone-like fractures.