Lathe spindle bearings, generally assembled with rolling bearings or sliding bearings into one, and rotate at a very high speed, sometimes will generate high heat. This phenomenon, if not promptly excluded, will lead to bearing overheating, and the corresponding part of the machine tool bearing temperature rise and thermal deformation, serious will make the spindle and tailstock is not as high, which not only affects the accuracy of the machine tool itself and machining accuracy, and will burn out the machine tool bearings.
Lathe spindle bearing is the main heat source in the spindle box, if the heat made by it is not discharged in time, it will lead to overheating of the bearing and increase the temperature of the corresponding part of the lathe, thus producing thermal deformation, which will seriously make the spindle and tailstock unequal in height. This will not only affect the precision and machining accuracy of the lathe itself, but also burn out the bearings and even the spindle.
lathe spindle bearing clearance is too small so that friction and friction heat increase; in the long-term full-load turning, the spindle rigidity decreases, bending occurs, and the transmission is not smooth and hot. When eliminating this fault, attention should be paid to: the spindle bearing clearance should be adjusted to make it suitable; the supply of lubricating oil should be controlled and the oil circuit should be unblocked; and the lathe should be avoided to bear long-term load as far as possible.
Reducing the diameter of rolling body can reduce the centrifugal force and gyroscopic moment, thus reducing friction and heat generation.
For example, the use of ceramic materials for rolling body, ceramic ball bearings and steel ball angular contact ball bearings, compared with high-speed rotation, rolling and sliding friction between the ball and raceway is reduced, heat generation is reduced.
Oil and gas and oil mist and other lubrication methods not only have a lubricating effect on the bearing, but also has a certain cooling effect.
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