FAG bearings after installation in the host, such as measuring bearing spindle runout, but found its spin measured value has a certain amount of change; continuous measurements, can be found after a certain speed after, this change will approximate repeats. Indicators for measurement of that variability cycle running accuracy, changes required to approximate repeats to a few representative robin rotation accuracy of "cycles", measure changes in quasi periodic large amplitude, is the circular rotation accuracy is poor.
1, need to be emphasized is that keep the bearings are lubricated and clean is very important. So before we examine FAG bearing, you should clean the bearing surface, and then disassembling bearing parts around. We should pay attention to, is very fragile parts oil seal, this require extra care in inspections and disassembly and Assembly, not excessive force, so as not to cause damage to parts. Then carefully check the bearing oil seal and its surrounding parts, if you have rendered out when adverse symptoms, be sure to replace the bad oil seals will result in damage to, prevent bearing cloud properly and cause downtime.
2, to check the FAG bearing lubricant. Lubrication is very important, not only for bearings, bearings for all. But note that the bearings should not be adding too much grease. On the checking method for bearing lubricants: stained lubricant on friction between two points, if the presence of pollutants, are feeling out; or coated with a thin layer of lubricant on the dorsum, and then make the rays. Then there is the replacement of the lubricant. Used oil lubricated bearings after purging old oil, if possible, should be poured into the fresh oil and let the machine at low speed of rotation for a few minutes. Oil collects residual contaminants as much as possible, and then purging these oils. Note: oil'd filtered before use. The use of FAG bearings grease lubricated when replacing the grease, used by Joe in addition to bearing should be avoid corners with cotton to any of the parts. Fiber because these residues may be between wedge on scroll and causing damage, especially small bearing application of more attention to this issue.
3, in order to extend the life of the bearing, install the required steps that cannot be ignored, how to provide precision directly affect the life of bearings, so before you install the bearing, first to the installation accuracy of determination of bearing, and then could not be found and given to raising. Improve the installation of bearing accuracy to avoid bearing failure due to improper installation, FAG bearings
(1) measurement of the shaft and housing bore size, to determine the bearing fitting accuracy to meet the 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 corner contact ball bearing Shi, also can increases gap); axis and block hole surface round degrees errors in 2 μ m following, bearing by with isolation 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 front inner end face runout of spindle below the 4 μ m.
(2) fixed-end bearings on the shaft before installation:
Will FAG bearing with clean of cleaning kerosene for thoroughly cleaning, for fat lubrication, first will contains 3%~5% grease of organic solvent injected bearing made skim cleaning Hou, again with oil gun will quantitative of grease filled into bearing within (accounted for bearing space volume of 10%~15%); heating FAG bearing makes warming 20~30℃, with hydraulic machine will bearing loaded into axis end; will tight will sets pressure in axis Shang and to suitable of pressure arrived live bearing end surface makes its axis to positioning; will spring scale of straps volume in bearing outer ring Shang, A measurement method of starting torque preload under the check whether there is a substantial change (even if the bearing is very correct, but because of the tie or cage deformation, preload changes possible).
(3) put bearings-shaft Assembly seat holes:
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, will axis rotating to measurement bearing block before and after block hole of with axis degrees.
(4) place the free end bearing selectively in may offset the location of deviation, installed into the housings support locations, offset the roundness deviation and with each other as much as possible with axis deviation. Improve the installation of bearing accuracy to avoid bearing failure due to improper installation, FAG bearings
FAG bearings in the industry, the largest volume of applications of this grease, accounted for 70% of the total amount of fat used. Because these grease selection fiber soft, easy filtering of lithium SOAP thickener, use mineral oil as the base oil, it is easy to meet the requirements of middle bearing reduces vibration values. Another advantage is that with good pumping, both mechanical and fat, was also hand-painted resin, is easy. Moreover, the low prices of the grease, you can greatly reduce the cost of bearing.



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