1: bearing crack treatment:

1. The formation of grinding force badness layer. In the grinding process, work piece surface layer will be grinding wheel cutting force, compression force and friction role. Especially after both action, to make the work surface layer formation of plastic deformation, the direction of strong layer and processing hardening layer. This metamorphic layer will inevitably affect surface layer residual stress changes.

2. Second quenching burns will make NSK bearing work piece surface layer stress changes. Secondary quenching area in compression state, under which the high temperature back there is the biggest sand materials tensile stress, here is the most likely place of core crack. The most easy to crack the original along austenite grain boundaries spread. Serious burns will cause the whole grinding surface crack caused the crash.

2: bearing acceptance standard:

Bearing the acceptance inspection usually can be divided into three parts:

1. Regular examination of the bearing and assembly-about the size accuracy, the rotation accuracy and bearing clearance and the residual strength of magnetic bearing project for inspection.

2. Special inspection of bearing vibration-quality, the quality of the bearing and the noise other special requirements for inspection.

3. The routine check-bearing the routine check when general.

With the coming of the internationalization tide, domestic and imported bearing code gradually code standards, the latest edition of the national standard display, domestic and international ISO standard code is identical.

F-lugs outermost deep groove ball bearings (applicable to inner < 10 mm)

HR-high load tapered roller bearings, for example: HR 30207 J

MF-specific size flange outermost deep groove ball bearings (applicable to inner < 10 mm)



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