SKF Bearing Online

1. SKF bearings to improve the accuracy of France
SKF bearings on the host computer is installed, such as the measurement of spindle runout SKF bearings can be found in each of its transfer of measured values have a certain amount of change; continuous measurement, may find that after a certain rpm, after this change will be approximately repeated. measurable indicators of the extent of this change for the cycle of rotation accuracy, repeated changes of approximately the required rotation cycle of rotation accuracy on behalf of the “quasi-periodic” In the quasi-periodic changes in amplitude value within a large, namely, poor circulation rotation accuracy.
such as SKF bearing spindle proper pre-load, speed and gradually increase to nearly the speed of work in order to implement bearing the “run-in “effect, can increase the cycle of spindle rotation accuracy.
2. improve the precision of a method of SKF bearings
a factory prototype precision instruments, spindle bearings with 6202/P2 its accuracy can not meet the requirements, the latter Bold in its journal on the making to replace the inner ring raceway, and glutinous rice balls close to measurements for a size for every three groups, each taking nearly 120 balls. intervals separated, due to a decrease of a re – machined surface, but also a decrease of the surface with a weight, while increasing the stiffness of shaft-bearing system, and the largest and the smallest three equidistant distribution of close to three balls, but also improve the precision of the axis of rotation, so to meet the instrument’s accuracy requirements.
3.SKF precision bearings to install a comprehensive calibration method
will be loaded angular contact ball bearing SKF bearing spindle, the installation of the accuracy of calibration in the following order (in shaft diameter as the 60m100mm ordinary lathe cases):
(1) measurement of shaft and housing bore dimensions, in order to determine with precision bearings to meet the requirements are as follows:
inner ring and shaft taken tight fit, over surplus quantity 0 ~ +4 mm (in the light-load, high-precision when 0); the outer ring and the bearing hole to take clearance fit, clearance volume of 0 ~ +6 mm (but in the free end of the use of angular contact ball bearings bearings, may also increase the gap); axis and seat Kong Roundness error of the surface of 2mm below the bearings used in every other circle face parallelism in the 2mm below the shoulder axis within the face of external face of the beating in the 2mm below; gear bearing hole on the axis of the shoulder with the beating of the 4mm below; spindle inside the front cover face right axis with the beating of the 4mm below.
(2) a fixed-side before the installation of shaft bearings in the bearing
kerosene with a clean wash thoroughly cleaned, for grease lubrication, first containing 3% ~ 5% lubrication grease into the bearing of organic solvents for degreasing and cleaning, another oil grease gun to fill in a quantitative bearing (bearing space volume accounted for 10% ~ 15%); heating bearings to heat up 20 ~ 30 ℃, oil presses the bearing load shaft; to tight set pressure in the shaft sleeve and bearing an appropriate pressure to resist end-to axial location; the spring balance of the tape volume in the bearing outer ring, and with the measurement method of starting torque under the validation whether there is a substantial pre-load change (even if the bearings are correct, but because of tie or cage deformation, pre-load also may change).
(3) the m-axis combination bearing seat hole
heating load Block hole to heat up 20 ~ 30 ℃, the pressure will be playful with a continuous m-axis combination bearing seat into holes; adjust the front cover, so that the front cover of the fastening volume of 0.02 ~ 0.05mm, in order to bearing outer face as a benchmark contravention of the dial gauge head of the table surface in the journal will be rotating shaft to measure the beating to require error of 10mm below; to dial gauge positioned on the shaft, the table surface of the first conflict with the rear hole will be rotating shaft to measure the bearing front and rear seat hole concentricity.
(4) the free end bearing on the selective bias may be offset by the location of the bearing after the bearing installation location, as much as possible to offset each other roundness deviation and concentricity deviation.
4.SKF bearings tapered bore double row cylindrical roller bearings installed
installation NN3000K series double-row tapered bore cylindrical roller bearings, we must note that the taper bearings and shaft diameter the correct match, the case in the production of less coloring method can be used to contact verification, but in the production of large quantities, it is best to use taper gauge precision checksum.
in the SKF bearings installed in the cone axis on when the inner ring should be transferred to a suitable location along the axial direction to radial clearance is close to zero.

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