INA bearing the provisions of the conditions of production characteristics in a regular examination

( 1) Temperature measurement of the measurement of environmental temperature is 20 ℃, the INA bearing, 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 INA 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 size tolerance for INA bearing, 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 with appropriate to the INA bearing measurement 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 measuring the inner and outer diameter of the INA bearing, 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. ( 1) Using the method of chemical additive added to add to the INA bearing lubricant of certain chemical additive, can reduce the bearing noise, such as tianjin a factory to produce a low-noise grease containing noise reduction additive, on the basis of bearing noise from the original can be reduced. 3. 2 db, suitable for use in the micro or small bearings. ( 2) Using vibration absorption or isolation devices using vibration absorption or isolation devices to reduce the noise or noise isolation bearing, INA bearing can get good effect, but this often pay a high price in terms of economy, sometimes make institutional change, cooling condition, or easy to rust, use appropriate comprehensive into consideration, only after other steps taken still cannot achieve low noise index after use of this law. The simplest example is under the high speed instead of the thrust bearing and thrust under the centripetal ball bearings, can be in the position to full of antirust oil absorption plastic outer coat, the thrust bearing of the belt cover or general thrust bearing in the permission, cylindrical hole in them or set in the same plastic covers, but control with adjacent parts when rotating friction or interference. This method has a certain silencing effect. Another example is in the middle of the bearing with a hole between join a set, can decrease the rotation system to bearing vibration on the power, but this requires allocate appropriate, or have the opposite effect may occur. An example again is a sound insulation cover using acoustic noise will happen in the bearing system is completely closed or closed up as soon as possible. 6 - LMM thickness of steel plate, surface uniform phi 1. 2 - 1. The area of the 5 mm small hole, hole accounted for about 25% ~ 30% of the entire inner surface of outer surface for 2 mm thickness of steel plate. Here the glass fiber or foam plastics are applied to eliminate the high frequency noise, the inner surface of the belt holes used to eliminate the low frequency noise, and outside surface of thick steel plate were used to isolate the noise gaiden.