Fine bearing device and improved precision method

Source: China Bearing Network Time: 2017-10-21

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1. The precision progressive method bearing is finished after the end of the device in the main machine; if the radial runout of the measuring spindle is measured; it can be found that the measured value of each revolution has a certain change, and the measurement is performed successively; it can be found that after passing the certain number of revolutions; Approximate repetitive rendering. The target for measuring the degree of such change is the cyclic rotation precision; changing the number of revolutions required to approximately repeatedly render represents the "quasi-period" of the cyclic rotation precision; the magnitude of the magnitude change in the quasi-period is large; Poor rotation accuracy for the cycle.
For example, the preload is properly applied to the main shaft; the rotational speed is gradually increased to the near-operation speed; the "run-in" effect of the bearing is implemented; the cyclic rotation accuracy of the main shaft can be improved.
2. One way to improve the accuracy of the bearing is to produce a fine instrument in a factory; the main shaft is used with the 6202/P2 type bearing and its accuracy is still not satisfactory; the rear journal is thickened and a raceway is made on it to replace the inner ring; Measured in detail; each set of three scales; each set of steel balls is separated by a distance of nearly 120Â°; because it reduces the appearance of a heavy machining; it also reduces the appearance of a cooperation; together, the rigidity of the shaft-bearing system is improved; The maximum three and the smallest three steel balls are nearly equidistantly distributed; the axis reversal accuracy is improved; therefore, the accuracy requirements of the instrument are satisfied.
3. The inductive verification method of the device accuracy is to install the angular touch ball bearing into the main shaft; the verification order of the device accuracy is as follows (for example, a general lathe with a shaft diameter of 60 100 mm):
(1) Measuring the dimensions of the shaft and the bearing housing hole; to determine the cooperation precision of the bearing; the cooperation requirements are as follows:
The inner ring and the shaft adopt the interference cooperation; the interference is 0ï½ž+4Î¼m (0 in light load and high precision), the outer ring and the bearing housing hole adopt the gap cooperation; the clearance is 0ï½ž+6Î¼m (but the bearing at the free end) When the angular contact ball bearing is used; the gap can be increased), the circularity of the shaft and the seat hole is less than 2Î¼m; the parallelism of the end face of the bearing is less than 2Î¼m; the inner end of the shoulder is less than 2Î¼m. The bearing block hole shoulder jumps to the axis below 4Î¼m, and the inner end face of the spindle front cover jumps below 4Î¼m.
(2) The fixed-end bearing on the shaft will completely remove the bearing with clean cleaning oil; the grease is smooth; the organic solvent rich in 3%-5% smooth grease is first written into the bearing for degreasing; Then use the oil gun to fill the bearing with the smooth grease (10% to 15% of the bearing space volume), heat the bearing to raise the temperature by 20 ~ 30 Â°C; use the hydraulic press to install the bearing into the shaft end, press the adapter sleeve The shaft is placed on the shaft with a suitable pressure to axially position the bearing, and the belt of the spring balance is wound on the outer ring of the bearing; whether the regular preload can be greatly changed by measuring the starting torque (even The bearing is correct; but because of the cooperation or deformation of the cage; the preload can also be changed).
(3) The bearing shaft assembly body is installed in the seat hole heating seat hole to raise the temperature by 20 to 30 Â° C, and the bearing shaft assembly body is installed into the seat hole by the successively gentle pressure, and the front cover is adjusted; the fastening amount of the front cover is 0. 02ï½ž0. 05Î¼m; based on the outer end of the bearing seat; the head of the dial gauge conflicts on the outer surface of the journal; the shaft is rotated to measure its runout; the demand error is below 10Î¼m, and the dial gauge is positioned on the shaft The head is in conflict with the inside and outside of the seat hole; the shaft is rotated to measure the coaxiality of the front and rear seat holes of the bearing housing.
(4) Selecting the free end bearing in an orientation capable of canceling the error; supporting the bearing after the device is placed to the bearing housing; and canceling the roundness error and the coaxiality error between each other as much as possible.
4. The device with tapered bore double row short cylindrical roller bearing is equipped with NN3000K series tapered bore double row short cylindrical roller bearing; it is necessary to pay attention to the correct matching of the inner diameter of the bearing and the taper of the shaft; the coloring method can be used in the case of less production value. Perform touch verification; but when the production volume is large; it is best to use a fine cone gauge to verify.
When the bearing is mounted on the tapered shaft; the inner ring should be adjusted to the proper orientation in the axial direction; the radial clearance is close to zero.

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