Machine tool industry demand for bearings

     Rolling use on the machine is mainly used for the following three parts: spindle, ball screw and general drive shaft.

     Machine tool spindle angular contact ball bearing as the basis for spare parts, its performance directly affects the speed of the machine, rotary precision, rigidity, resistance to cutting chatter vibration, noise, temperature and thermal deformation, thereby affecting the accuracy, surface quality of machined parts and so on. Therefore, the performance of the machine must be equipped with a high-performance bearings.

     Accuracy of rolling bearings is generally divided into P0, P6, P5, P4 and P2 five grades for the accuracy of precision machine tool spindle bearings should be P5 level and above, and for CNC machine tools, machining centers and other high-speed, high-precision machine tools spindle bearing, you need to choose P4 and above the level of ultra-precision high precision ball bearings.

     Machine tool spindle bearings typically include deep groove ball bearings, angular contact ball bearings, cylindrical roller bearings, angular contact thrust ball bearings, tapered roller bearings and thrust bearings and other six kinds of structure types.

     With the rapid development of numerical control technology, "complex, high-speed, intelligent, sophisticated, green" has become the main trend of the machine tool industry technology development. Among them, the high-speed processing can improve the machining efficiency and shorten the processing cycle of the workpiece. This requires the spindle and its associated components to adapt to the needs of high-speed machining. Currently, the CNC machine tool spindle bearings are basically limited angular contact ball bearings, cylindrical roller bearings, angular contact thrust ball bearings and tapered roller bearings and other types of four structures.

     With the CNC machine tool spindle to speed the development of ceramic materials (mainly Si3N4 ceramic works) due to having low density, high elastic modulus, thermal expansion coefficient, wear resistance, high temperature resistance, corrosion resistance, excellent performance, making it manufactures high-speed ideal material for precision bearings. Ceramic bearings are more widely used, given the difficult process of ceramic materials, precision ceramic bearing rolling elements are mostly ceramics, chrome steel inner and outer rings still manufactured hybrid ceramic ball bearings.

     As a precision ball screw, efficient and sensitive transmission components, should be used in addition to high-precision screw, nut and ball, we must also pay attention to the choice of the axial stiffness, friction torque, high running accuracy of the bearing. Ball bearing used in the past two-way thrust angular contact ball bearings, tapered roller bearings, needle roller and thrust roller bearings, deep groove ball bearings and thrust ball high precision bearings  Currently, ball bearing using the most is the contact angle of 60 ° single row angular contact ball bearings and precision to P4 and above grade level is based.

     Rolling general machine tools installed in the drive shaft, the requirements and selection and general machinery drives bearing the same, just to meet the strength and durability requirements, speed does not exceed the speed limit can be specified in the bearing.

     Under normal circumstances, we mentioned refers to the machine bearing spindle bearings and ball screw bearings, precision machine tool bearings refers to the accuracy level above P5 and P5 screw spindle bearings and bearings.