Home>Bearing knowledge>Rolling bearing specification: Rolling bearing residual magnetic skill condition

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Rolling bearing specification: Rolling bearing residual magnetic skill condition

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1, the scope of application
1.1 This specification applies to all types of normal-grade bearings in the range of 28 to 430 mm outside diameter.
1. 2 bearing residual magnetic error linear non-uniform magnetic. 洳饬 胨捎 胨捎 胨捎 胨捎 牟饬吭恚桓 牟饬吭恚桓 牟饬吭恚桓 牟饬吭恚桓 牟饬吭恚桓 嗬氲 . . . . . . . . . . . . . . . . . . . . . . . .. The value measured under one rule; the residual magnetic value measured under other parameters is not applicable to this specification.
2, citation specification
GB 3102. 5-82 "Electrical and magnetic quantities and units"
JB 3371-83 "Rules for Rolling Bearings and Commodity Parts Inspection"
3, the definition and the unit of magnitude
3.1 Residual magnetism means that the bearing is magnetized during the production process; the maximum residual magnetism is not eliminated after demagnetization.
3. 2 The physical quantity of the magnetic induction intensity of residual magnetism is indicated; the unit is mA (mT).
4, measurement method
4. The residual magnetic measurement adopts the Hall effect principle; the measuring instrument needs to have a range of 1mT and an accuracy of 3% or positive. The Hall element specification of the instrument is 4*2*0. 2 cubic meters; the Hall element plane The interval from the measured surface is plus or minus 0. 05mm.
4. 2 Regarding the radial ball bearing; the measuring part is the end face and the chamfering point. The maximum reading obtained when measuring is the residual magnetic value of the bearing.
4. 3 Regarding cylindrical roller bearings, needle roller bearings, spiral roller bearings, tapered roller bearings and thrust roller bearings; the parts that can be separated should be separated from the rear. The measuring parts except the inner and outer rings (or seats) , shaft ring) outside the end face and chamfer; also should measure the exposed part of the roll; if the residual magnetic part of the roll is found at the junction with the cage; the roll can be properly changed; the part is exposed and measured. The type of bearing can not be separated from the measurement method; according to the rules of 5.2.
4. 4 About spherical roller bearings; when measuring both end faces and chamfering points; refer to the rules of 5.2. When measuring the rolling body, the radial planes of the inner and outer rings should be 90 degrees of each other. Rolling body The measurement method is based on the rules for the measurement of the rolling body in Article 5.
4. 5 Regarding the thrust ball bearing; the washer that can be separated should be measured after leaving; the measuring part is the end of the seat, the end face of the shaft ring and the chamfering. The measuring method of the type of bearing can not be separated; according to the rules of 5.2 .
4. When measuring the residual magnetism of the bearing end face; the probe is perpendicular to the bearing end face; when measuring the chamfer of the bearing and the residual magnetism of the rolling body; the probe can be used for recording the skew; but the inclination is not more than 45 degrees.
4.7 When the residual magnetism on the bearing ring or the roll body is close to the value of the rule; the bearing end face should be placed in a flat position; then the treatment should be measured in the east-west direction; to reduce the influence of the earth's magnetic field.
4. 8 It is not allowed to measure on the magnetic field working table and in the environmental magnetic field greater than the strength of the earth's magnetic field.
4.9 The dispersion of residual magnetism on the bearing is random; when measuring; the measurement orientation of the probe on the bearing is not pre-set. The movement of the probe should be such that it can reach any measured part of the bearing; the measurement of the fixed probe The method does not apply to this specification.
5, check the rules and residual magnetics to check the sampling method; the number of samples according to the rules of JB3371; take the acceptable quality level AQL is 4; usually check the level for sampling.
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