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INA bearing after installation in the host, such as measurement of spindle runout, but found its spin measured value has a certain amount of change; during continuous measurement, can be found after a certain speed after, this change is approximately repeats. Measure of this variability for cyclic running accuracy, changes required to approximate repeats to a few representative cyclic running accuracy of "cycles", measure changes in quasi-periodic amplitude, cyclic running accuracy is poor.
1, the radial preload method
Radial tightening method uses in withstanding radial load bearings with a tapered bore, a typical example is the double-precision INA bearing, nut adjusting the INA bearing axial position relative to the tapered neck so that appropriate expansion of the inner ring are the radial clearance, which is usually used in machine tool spindle and Jet engines.
2, axial preload method
Axial preloading method in general position preload and tightening can be divided into two kinds. In positioning pre-tight in the, can through adjustment lined set or gasket of size, obtained suitable pre-tight volume; also can through measurement or control up dynamic friction moments to adjusting was suitable of pre-tight; also can directly using advance adjusting good pre-tight volume of into on double Alliance bearing to achieved pre-tight of purpose, at this time General does not needed user again line adjustment, anyway, who after axis to pre-tight of INA bearing, using Shi its relative location certainly does not occurred changes. Preload is constant pressure for spiral springs, disc springs, way to make INA bearing proper tightening. Preload spring-like rigidity much less rigid than INA bearings, INA bearing relative positions of preload so there will be pressure in use vary, but preload remained virtually unchanged.
After the spindle bearings mounted, installed accuracy calibration sequence is as follows (with shaft diameter for lathe 60?100mm as an example):
(1) measurement of the shaft and housing bore size to determine the fitting accuracy of the bearing to meet requirements are as follows:
Within ring and axis take had Ying tie, had Ying volume 0~+4 μ m (in light load, and high precision Shi for 0); outer ring and bearing block hole take gap tie, gap volume 0~+6 μ m (but in free end of bearing using INA bearing Shi, also can increases gap); axis and block hole surface round degrees errors in 2 μ m following, INA bearing by with across ring of end surface parallel degrees in 2 μ m following, axis shoulder within end face outside end surface of beat in 2 μ m following; bearing block hole retaining shoulder on axis of beat in 4 μ m following ; Axis of spindle Cap inner end face runout 4 μ m or less.
(2) fixed-end bearings on the shaft before installing
Will bearing with clean of cleaning kerosene for total cleaning, for fat lubrication, first will contains 3%~5% grease of organic solvent injected INA bearing for skim cleaning Hou, again with oil gun will quantitative of grease filled into bearing within (accounted for bearing space volume of 10%~15%); heating bearing makes warming 20~30℃, with hydraulic machine will INA bearing loaded into axis end; will tight will set pressure in axis Shang and to suitable of pressure arrived live bearing end surface makes its axis to positioning; will spring scale of strap volume in bearing outer ring Shang, Starting torque measurement method verifies that the required preload is a significant reduction from the change (even if the bearing is correctly, but as with deformation or cage, preload may also change).
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 4T-2780/2720 NTN | 36.487 | 76.2 | 25.654 |
| 4T-25880/25821 NTN | 36.487 | 73.025 | 24.608 |