SKF bearing processing standards and pay attention to the problem

( 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 SKF 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 used in the spindle in the measurement of SKF bearing the project such as Kia, Kea, and Sd, cylindrical hole for the bearing and taper of the taper spindle used stipulation for 1/5000 l / 10000 in principle, for the taper hole uranium bearing, basic taper 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 general bearing, take ring not print face to measurement datum, for angular contact ball bearings and tapered roller bearings, take take datum of thrust load end. Bearing parts, although has simple structure, high technical requirements, and therefore has the following several machining features: 1. Precision machining SKF bearing parts most of the surface to after grinding, grinding size and geometric accuracy are in microns, especially ring raceway and rolling body of higher precision, superfinishing or grinding processing. 2. Bearing parts processing various process demanding, the production process will be more. General bearing production need 20 ~ 40 working procedure, much more than 70. 3. Processing of bearing parts work is rotary forming on the surface, suitable for molding in processing. Such as forged ring groove rolling mill and car, is the forming tool or prevent plate processing. In addition, the vast majority of SKF bearing are standardized products, the same type of bearing demand is very big, in order to improve the productivity, reduce costs, ensure the quality and the widespread adoption of new technology, improve the level of mechanization and automation, bearing company usually is according to the bearing types and varieties for mass production, even can establish special automatic line or lines of production