The use of rolling bearings on machine tools

Release Time:2017-07-19 11:39:08 Browse number  :

  The use of rolling bearings on the machine tool is mainly used for the following three parts: the main shaft, the ball screw and the general transmission shaft.
  Spindle bearing as the foundation of the machine tool accessories, its performance directly affects the machine speed, rotary accuracy, rigidity, resistance to fibrillation vibration cutting performance, noise, temperature rise and thermal deformation of the, which affect the machining precision and surface quality. Therefore, bearing high performance machine must be equipped with high performance. High speed precision numerical control machine tool bearing.
  Rolling precision bearings are generally divided into five grades: P0, P6, P5, P4 and P2, for the accuracy of a precision machine tool spindle bearing should be P5 and at a higher level, and for high speed, high precision CNC machine tools, machining center machine tool spindle bearing, selection of P4 and superior super precision bearings.
  Machine tool spindle bearing usually include deep groove ball bearings, angular contact ball bearings, cylindrical roller bearings, double direction thrust angular contact ball bearing, tapered roller bearing and thrust bearing six kinds of structure types.
  With the rapid development of numerical control technology, "compound, high-speed, intelligent, precision, environmental protection" has become the main trend of the development of machine tool industry. Among them, high speed machining can effectively improve the machining efficiency of machine tools and shorten the processing cycle of the workpiece. This requires the spindle of the machine tool and its related components to meet the needs of high speed machining. At present, CNC machine tool spindle bearings are basically limited to four types of structure, such as angular contact ball bearings, cylindrical roller bearings, two-way thrust angular contact ball bearings and tapered roller bearings.
  With the CNC machine tool spindle to the high-speed development of the, ceramic materials (mainly refers to the Si3N4 engineering ceramics) because of its low density, modulus of elasticity is high, and the thermal expansion coefficient is small, wear-resisting, withstand high temperatures, excellent properties, such as corrosion resistance, thus becoming the ideal material for high-speed precision bearing manufacturing. Ceramic bearings have been more and more widely application, in view of the ceramic material is hard to be manufactured, precision ceramic bearing for rolling body is ceramics, both inside and outside the ring still by chrome steel manufacturing of hybrid ceramic ball bearings.
  Ball screw vice as precise, efficient, sensitive transmission element, in addition to should be used in high precision screw, nut and ball, should also pay attention to selection of axial stiffness, friction torque is small, running high precision bearing. Ball screw support used double direction thrust angular contact ball bearings, cone roller bearings, needle roller and thrust roller combined bearings, deep groove ball bearings and thrust ball bearings. At present, the ball screw support with the most is a single row angular contact ball bearings 60 contact angle, but also the accuracy level is P4 and above level.
  The machine tool is installed on the general drive shaft of the rolling bearings, its requirements and selection and general mechanical drive bearings, only to meet the strength and life requirements, speed is not more than the specified limit speed can be.
  In general, we refer to the machine tool bearing is the spindle bearings and ball bearings, precision machine tool bearings is the precision of P5 and P5 to the superior spindle bearings and screw bearings.

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