Machine tool spindle bearings usually include deep groove ball bearings, angular contact ball bearings, cylindrical roller bearings, angular contact thrust ball bearings, tapered roller bearings and thrust bearings six structure types.
With the rapid development of numerical control technology, composite, high-speed, intelligent, precision, environmental protection has become the main trend of today's machine tool industry technology development. Wherein the high-speed machining can effectively improve the machining efficiency to shorten the processing cycle of the workpiece. This requires the machine tool spindle and its associated components to adapt to the needs of high-speed machining. CNC machine tool spindle FAG Bearings basically limited angular contact ball bearings, cylindrical roller bearings, and angular contact thrust ball bearings and tapered roller bearings, four structure types.
Along with the CNC machine tool spindle to speed the development of ceramic materials (mainly Si3N4 engineering ceramics) has a low density, high elastic modulus, thermal expansion coefficient, wear resistance, high temperature resistance, corrosion resistance and other excellent performance, which manufactures high-speed an ideal material for precision bearings. Ceramic bearings are more widely used; in view of the ceramic materials difficult to machine precision ceramic bearings are rolling element is a ceramic inner and outer rings still chrome steel hybrid ceramic ball bearing.
Ball screw as precise and efficient, sensitive transmission components, in addition to high-precision screw, nut and ball, should also pay attention to the selection of axial stiffness, bearing friction torque, high running accuracy. Ball screw support common way thrust angular contact ball bearings, tapered roller bearings, needle roller and thrust roller bearings, deep groove ball bearings and thrust ball bearings. Currently, ball screw support the use of up to 60 ° contact angle single row angular contact thrust ball bearings, INA Bearing Accuracy class is P4 level and above.
Machine tools installed in the rolling bearing on the general drive shaft, its requirements and selection bearing the same with ordinary mechanical transmission, just to meet the strength and life requirements, the speed does not exceed the bearing speed limit can be specified.
Under normal circumstances, TIMKEN bearings, machine tool bearings we have mentioned is the machine tool spindle bearings and ball screw bearings, precision machine tool bearings refers to the accuracy of the P5 class spindle bearings and screw bearings.
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