1 Scope
    1.1 This standard applies to all types of general-level bearing outside diameter within the range of 28 to 430mm.
    1.2 bearing residual magnetic nonuniform magnetic field is nonlinear, the measured value and the measuring principle used in the inductive element and its measuring distance. This standard specifies the residual magnetic value is the value measured under the conditions specified in 5.1, the other parameters measured residual magnetic values ??do not apply to this standard.
    2 reference standards
        GB 3102.5-82 "Electricity and Magnetism, quantities and units."
        JB 3371-83 "Rolling commodity parts inspection rules
    3 to define and measure units
    3.1 residual magnetic bearings in the production process is magnetized by the yet to be eliminated after the demagnetization maximum residual magnetic.
    3.2 residual magnetic with magnetic induction physical quantity units of milli special (mT).
    4 Technical Requirements
    5 measurement method
    5.1 residual magnetic measurements using a Hall-effect principle, the measuring instrument must have 1mT the range and precision of plus or minus 3%. The instrument is equipped with a Hall element specifications for 4 * 2 * 0.2 cubic meters, and the Hall element plane and the measured distance from the surface of plus or minus 0.05mm.
    5.2 for radial ball bearings, the measurement site for both ends and chamfering. Maximum readings obtained for the measurement of the value of the residual magnetic bearings.
    5.3 For cylindrical roller bearings, needle roller bearings, spiral roller bearings, tapered roller bearings and thrust roller bearings, measure its detachable parts should be separated. Addition to the inner and outer rings (or seat, shaft washer) end and chamfer the measurement site should also measure the exposed parts of the rolling elements, such as rolling body residual magnetic parts in a cage at the junction of the rolling elements may be appropriate rotation so that the parts measured after exposing. For these bearings can not be separated type of measurement methods, in accordance with the provisions of 5.2.
    5.4 Spherical roller bearings, measuring both ends and chamfering at the reference to the provisions of 5.2. Measuring the rolling body to be within a radial plane of the outer ring into each 90 degrees. The rolling body measuring 5.3 on the rolling body measurements.
    5.5 Thrust ball bearings, separable washers should be separated measurement, measurement site for the seat, shaft washer end and chamfer. For these bearings can not be separated type of measurement methods, in accordance with the provisions of 5.2.
    5.6 measuring bearing face residual magnetic probe vertical position of the end face of the bearing, measuring residual magnetic bearing chamfering and rolling elements, the probe can be used for appropriate recorded tilt, but not more than 45 degrees inclination.
    5.7 when the bearing rings or rolling residual magnetism on the body close to the required value, should first bearing end face in its resting position, then the department in the east-west direction measurement, in order to reduce the influence of the geomagnetic field.
    5.8 allowed in permeable work bench and the environmental magnetic field is greater than the field intensity measurement.
    5.9 residual magnetism in the bearing on the distribution is random, and the measurement, the measuring position of the probe on the bearing can not be set in advance. The movement of the probe so that it can arrive any bearing on the test site, does not apply to the standard fixed probe measurements.
    6 Inspection Rules
    The residual magnetic check sampling acceptance sampling number JB3371 provisions, take to receive quality level AQL 4, general inspection level sampling.
 



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