SKF bearing of the machine tool industry needs
The rolling bearing in the use of the machine is mainly used for the following three parts: main spindle, the ball screw and general transmission shaft.
As the foundation of the spindle bearing machine tool accessories,brass bushing its performance directly affect the speed of the machine tool, the rotation accuracy, rigid, fight fibrillation vibration cutting performance, noise, temperature rise and thermal deformation and so on, then affects the precision of parts processing, surface quality, etc. Therefore, high performance of plain bearing the machine tools must be of high performance NSK bearings with.
The accuracy of rolling bearings are generally classified into P0, at the P5 and P4 and P2, 5 grades, used for precision machine tool spindle bearing accuracy should be on the P5 and its level,plasic bushing and for nc machine tools and machining center, and other high-speed, high precision machine tool of spindle bearing, it needs to choose P4 and the super precision bearings.
Machine tool spindle bearing with often include deep groove ball bearings, angular contact ball bearings, cylindrical roller bearings, two-way thrust Angle contact ball bearing, tapered roller bearing and thrust bearing of six kinds of structure types.
With the rapid development of numerical control technologyMould guide plate , "compound, high speed, intelligent, precision, environmental protection" has become the machine tool industry technology development trend. Among them, high speed processing can effectively improve the efficiency of the machine tool, shorten the workpiece machining processing cycle. DU bushing This requires spindle and related components to adapt to the needs of the high speed machining. At present, the numerical control machine tool spindle bearing basically is limited to FAG Angle contact ball bearing, cylindrical roller bearing, two-way thrust Angle contact ball bearing and tapered roller bearing four structure types.
With numerical control machine tool spindle high to development, ceramic materials (mainly refers to the Si3N4 engineering ceramics) because of its density is small and the elastic modulus of high thermal expansion coefficient, small, wear-resisting, high temperature resistant, corrosion resistance, excellent performance, so as to become a manufacturing high speed precision bearing materials ideal. Ceramic bearings to get more and more wide application, given the difficult machining ceramic materials, precision ceramic bearing much for scrolling body is ceramics, inside and outside contractor by the mixture of chrome manufacturing still ceramic ball bearings.
The ball screw as precise, efficient, vice sensitive transmission components, besides should adopt high precision ball screw, nut and ball outside, still should pay attention to choose axial high stiffness, friction torque, running small of high accuracy bearing. The ball screw supporting used two-way thrust Angle contact ball bearing, tapered roller bearing, needle and thrust roller combination bearings, deep groove ball bearings and thrust ball bearing, etc. At present, the ball screw supporting the most is 60 ° Angle contact single thrust Angle contact ball bearing, and, INA bearing accuracy level is also to the P4 and give priority to.
Machine tools with packed in general transmission shaft of rolling bearing, the request and the selection and ordinary mechanical transmission bearing the same, need to satisfy the intensity and the life requirement, the rotating speed is not more than the provisions of the bearing limit rotational speed can be.
Normally, TIMKEN bearing we mentioned machine tool bearing spindle bearing and refers to the ball screw bearing, precision machine tool bearing is refers to the P5 and precision of the main shaft bearing the P5 and ball screw bearing.