1. universal joint bearings precision improving method
Universal joint bearings after installation in the host, such as measurement of universal joint bearing 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.
Universal joint bearing spindle with appropriate preload speed gradually increased to close to the speed, to achieve a bearing "break-in" effect, cycles of spindle running accuracy can be improved.
2. the method of verification for universal joint bearings precision integrated
After the universal joint spindle bearing mounted, installed accuracy calibration sequence is as follows (with shaft diameter for lathe 60-100mm as an example):
(1) fixed end Qian bearing in axis Shang of installed: will million to section bearing with clean of cleaning kerosene for total cleaning, for fat lubrication, first will contains 3%~5% grease of organic solvent injected 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 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 ; The spring scale tape volumes on the bearing outer ring, 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).
(2) will million to section bearing-axis combination body loaded seat hole: heating block hole makes warming 20~30℃, with continuous mitigation of pressure will bearing-axis combination body loaded seat hole; adjustment Qian cover, makes Qian cover of tight solid volume for 0.02~0.05 μ m, to bearing block outside end surface for benchmark, will indicator of table head subject to in axis neck surface Shang, will axis rotating measurement its beat, requirements errors in 10 μ m following; will indicator positioning in axis Shang, table head subject to Hou block hole within surface, Axis to measure concentricity of the bearing bore.
(3) place the free end bearing selectively in location that may offset the bias, after you install the housing support, offsetting each other as much as possible deviation of roundness and concentricity deviation.
(4) measurement axis and bearing block hole of size, to determines bearing of tie precision, tie requirements following: 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 corner contact ball bearing Shi, also can increases gap); axis and block hole surface round degrees errors in 2 μ m following, million to section bearing by with across ring of end surface parallel degrees in 2 μ m following, Shaft end face of outer face beat in 2 μ m; the housing bore axis of abutment on beat 4 μ m; axis of spindle Cap inner end face runout 4 μ m or less.




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