Bearing routine examination prescribed conditions

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Rolling bearing of the routine examination of goods, must be carried out under the conditions laid down in line with national standards.precision bearings
(1) ambient temperature measurement temperature measurement provisions is 20 ℃, including bearings, gauge blocks, standard parts, and the temperature of the measuring instruments must be the same as above them on the same piece of metal plate can be the fastest to achieve the necessary balance of temperature, otherwise take several hours or even days to achieve this balance. In order to get the correct measurement results, foreign manpower measurement mechanization to avoid contact with these objects or oven mitts to operate.
(2) for the bearing inner or outer diameter of the measurement, the measurement region in a predetermined the southern end face of the domestic provisions leave the ferrule are each a maximum chamfer coordinate measurements within the region, while the foreign multi predetermined leaving ferrule both end faces of each of two within measurement times chamfered coordinate region. (3) size reference measurement Comparati ve Measurement bearing dimensional tolerances to provide that the amount of block or standard parts as a comparative measurement of the size of the base, including the amount of block must comply with the provisions of the Standard JB/T1078 "gauge block, standard The piece must comply with the provisions of the competent department of the factory.
(4) The measuring instruments used in the predetermined measurement instrument must be calibrated, and having to adapt the precision of the measured bearing and enlargement ratio.
(5) allow the principle of measurement error can be tolerated on the measurement error in the tolerance of 10% or less.
(6) In order to reduce measurement errors, the probe radius and the pressure of the measurement table, within a possible range to seek to reduce the pressure of the measurement table, - the measuring force and increase the radius of curvature of the probe. In the measurement of the inner and outer diameters of the bea ring, the measuring force and the radius of curvature of the probe can be used with reference to the selection.sealed ball bearing
(7) used for the measurement of the mandrel in measuring bearing Kia, Kea and Sd projects, for the cylindrical bore, the bearing, with the principle of the taper of the taper of the mandrel is defined as 1/5000 of a l/10000 For tapered bore uranium Order of used the basic taper of the taper of the mandrel is defined as 1/12. (8) measuring the load when measuring Kia, Kea and SIA, the Sea project, the need to exert the necessary measure the load, so that the rolling body and the ferrule is in a normal contact position, in order to obtain stable measured values.
(9) measurement datum provisions generally rolling bearing, taken when measuring the nonprinting end ferrule datum, angular contact ball bearings and tapered roller bearings, whichever withstand the end face of the thrust load datum.stainless steel ball bearings