Bearing the provisions of the routine inspection conditions - bearing knowledge

Rolling bearing routine inspection of goods, must be in accord with the conditions specified in the national standard. ( 1) When the temperature measurement of the measurement of environmental temperature is 20 ℃, the bearings, gauge block, standard parts and the temperature of the measuring instrument must be the same, the above them on the same piece of metal plate method can fast achieve the necessary temperature balance, or take a few hours or even days to reach the balance. Abroad in order to get the correct measurements, rely on the measurement of mechanization to avoid hand contact with these things, or wear insulated gloves. ( 2) The provisions of the measuring area for bearing inner diameter or outer diameter measurement, domestic regulations leave the ring on the southern side of one of the biggest chamfering coordinates within the area of measurement, and foreign many regulations to leave the ring twice in two end chamfering coordinates within the area of measurement. ( 3) The provisions of the benchmark in the comparative measurement method for measuring bearing size tolerance for, dosage of rules or standard for comparison measuring the size of the benchmark, the gauge block must conform to the standard JB/T1078 'gage block' regulation, standard parts must comply with the provisions of the competent department of factory. ( 4) The provisions of the measuring instrument used in the measurement instrument must be calibrated, and have to adapt themselves to the test bearing precision and magnification ratio. ( 5) Allow the measurement error in principle error of measurement may be allowed in the tolerance of less than 10%. ( 6) Probe radius and the pressure of the inventory in order to reduce the measurement error, must be within the scope of the possible, makes every effort to reduce inventory pressure measuring force, and increasing the probe radius of curvature. When the inner and outer diameter of the bearing measurement, measurement and head of radius of curvature can be used in reference to select. ( 7) Measurement of the spindle in the measurement of bearings used the project such as Kia, Kea, and Sd, cylindrical hole for the bearing, taper of the taper spindle used stipulation for 1/5000 l / 10000 in principle, for uranium bearing, taper hole taper basic rules of the taper spindle used is 1/12. ( 8) Measuring load regulation when measuring Kia, Kea and Sia, Sea project, such as need to impose necessary to measure the load, the rolling body contact with the ring in a normal position, in order to obtain stable measured value. ( 9) The provisions of the measuring datum for rolling bearing, the average take ring not print face to measurement datum, for angular contact ball bearings and tapered roller bearings, take under thrust load end face to the datum.