Machine tool spindle bearing installation drawing explanation

For machine tool industry, has a solid spindle bearing is the basic conditions for the conduct of the back. Appropriate to stability is better, the temperature of the main shaft bearing, lubrication moderation, these are the basis of the spindle bearings run more smoothly. If comply with the above conditions, then measured by use of the working condition of main shaft bearing. （ 1) Rolling bearing pre-tightening methods: bearing inner ring. This method is suitable for the cone Kong Shuang row cylindrical roller bearings. With a nut through the sleeve to promote inner ring on the conical journal make axial movement, the inner ring deformation swell, produce interference on the rolling path, so as to achieve the goal of preloaded. （ 2) Grinding seat through the grinding of bearing inner and outer race, can adjust the bearing pre-tightening force. As shown in the form of two kinds of grinding. For bearing outer relatively wide side ( Back to back) Installation, then the grinding of bearing inner ring inside, make a gap increases; As shown in the peripheral relatively narrow side ( Face to face) Installation, then the grinding of bearing outer ring narrow edge. In the relative relationship between assembly when installed as shown, with a nut or flange cover two bearing axial compression approach, two grinding surface tiejin, such making that occurs between two bearing raceway preloaded. Nc machine tool spindle configuration form the configuration shown in the form, the former bearing adopts double row short cylindrical roller bearing and 60 ° angular contact ball bearing, bear radial load and axial load, bearing adopts into Angle contact ball bearing, this configuration can improve the comprehensive rigidity of spindle, meet the requirements of power cutting, widely applied in all kinds of CNC machine tools. Before the configuration shown in form, bearing the angular contact ball bearing, is composed of 2 ~ 3 bearing cover, installed back-to-back, bear radial load and axial load, bearing adopts double row short cylindrical roller bearing, after this configuration is suitable for high speed and overloaded spindle parts, as shown in the front and rear bearing adopts into Angle contact ball bearing, to bear radial load and axial load, this configuration is suitable for high speed, light load and precision CNC machine tool spindle. Shown in front bearing with double row taper roller bearings, bear radial load and axial load, the bearing with single row taper roller bearings, this configuration can be under heavy load and strong dynamic load, the installation and adjustment performance is good, but the improvement of spindle speed and precision is restricted, suitable for medium accuracy, low speed and heavy load of nc machine tool spindle. Main shaft of the rolling bearing pre-tightening and rational selection of spindle rolling bearing preload preload, can improve the rotation accuracy of spindle assembly, the rigidity and vibration resistance. The adjustment of the rolling bearing clearance or preload, usually by the relative axial bearing inner and outer ring movement. Nc machine tool spindle the structure of the commonly used several kinds of rolling bearing. Machine tool spindle with a tool or jig for rotary movement in support, need to pass cutting torque and inherit the cutting resistance, and to ensure that the necessary rotation accuracy. Spindle bearing according to the rotational speed of spindle parts, bearing capacity and the rotation accuracy requirements of different and use different kinds of bearings. As small and medium-sized nc machine tools ( Such as lathe, milling machine, and grinder) Most used rolling bearing of spindle assembly; Heavy duty nc machine tools using liquid hydrostatic bearing; High precision CNC machine tools ( Such as jig grinding machine) Using aerostatic bearing; Ultra-high speed ( 2 ~ 100000 r/min) The spindle can use magnetic bearings or ceramic ball bearing. In various types of bearings, is popular with the use of the rolling bearing, as shown in the main shaft commonly used several types of rolling bearing. Double row cylindrical roller bearings, double row centripetal thrust ball bearing double row circular cone roller bearings with flange, double row cylindrical roller bearings with single row circular cone roller bearings, the nc machine tool spindle the structure of the commonly used several kinds of rolling bearing. Tags: spindle bearing installation