1. NSK bearings precision forward method
NSK Bearings settle after the host, such as measuring radial NSK bearing spindle runout, can be found in each of its transfer of measured values have necessarily change; continuous measurement, can be found after the inevitable number of revolutions, this shift will Similarly repeatedly thrown. Weighing the indicators of the level of this transition is the cycle reversing the accuracy, transition similar to the representative of the number of revolutions required repeatedly thrown cycle reversing the accuracy of the quasi-periodic, quasi-periodic measure changes in the amplitude of a large, namely loop to reverse poor accuracy.
NSK bearing spindle proper pre load slowly increased the speed to close things speed, reversing the cycle of the implementation of the "run-in" dip, you can move forward spindle bearing accuracy.
2 forward a style NSK Bearings accuracy
A factory prototype precision instruments, spindle with 6202/P2 type bearing its accuracy can not be satisfied with the requirements of the after Bold journal and build on her kitchen generation of inner ring raceway to precision measurement, and Ball to the size of big and small three group, each group of steel balls to take close to 120 ° containment must open, eliminated a heavy processing overview eliminated with a weight profiles, while advancing the stiffness of the shaft bearing system, while the biggest three with a minimum of three steel ball nearly equidistant diffuse derivative forward axis rotary precision so satisfied with the accuracy requirements of the instrument.
The bearings settle precision 3.NSK Verification Method
The angle arms ball bearing spindle load NSK Bearings, settled the accuracy of the calibration sequence is as follows (shaft diameter 60-100mm popular lathe for example):
(1) measuring the size of the shaft and the bearing hole, to determine with precision bearings, with the following requirements: the inner ring and the shaft to accept interference fit, the amount of interference 0 ~ +4 μm (at light load, high-precision 0) ; gap with the outer ring and bearing holes to accept the amount of backlash 0 to +6 μm (but in the freedom of true bearing operating angle arms ball bearings, but also increase a large gap); overview of shaft and housing bore roundness error of less than 2μm bearings parallel to the end face of the spacer in the 2μm or less, the shaft shoulder faces the external end of the beating of 2μm or less; the bearing hole stopper shoulder to the axis of the beating in a 4μm following; spindle inside the front cover side facing the axis of the beating in the 4μm less.
, And then after the organic solvent (2) of the front bearing on the shaft to settle in the stationary end: the bearing with a clean cleaning oil thoroughly cleaned, greased, the first containing 3% to 5% of grease into the bearing for degreasing oil gun would fill in the bearing grease quantitative (accounting for 10% to 15% of the bearing space volume); heating bearings so that the temperature rise from 20 to 30 ℃, oil press bearing onto the shaft; tight sets against the shaft and a suitable pressure up against the end bearings axially positioned; spring balance tape volume in the bearing outer ring, start the torque style check under the pre-load by measuring a large magnitude of the transformation (even if the bearings exact, but because of the fitting or deformation of the connecting frame, the pre-load also changes schematic).
(3) NSK Bearings - axis combination into the seat hole: heated seat hole temperature 20 to 30 ℃ consecutive playful pressure will be loaded into the housing bore bearings - shaft combination; adjust the front cover, the front cover fastening capacity of 0.02 ~ 0.05μm, to end basis chock, the dial gauge table the first conflict in the journal overview shaft torsion measurement of its beating, the error is less than 10μm; dial gauge positioning in axis, table head conflict with the rear hole appearance torsion shaft to measure the bearing of the front and rear seat hole concentricity.
(4) the free end bearing selectively on the schematic offset weaknesses position, settled after the supporting position to the bearing seat, best schematically offset between the roundness weaknesses and concentricity weaknesses.


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