The structure of machine tool spindle bearing

The daily production of industry cannot leave the machine tool, machine tool spindle bearing is very big, the effect of machine tool can run properly, the spindle bearing, the structure of machine tool spindle bearing is also very important, today, to take you know. Spindle bearings 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. Nc machine tool bearing according to the speed of the bearing 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, grinder, milling machine, machining center) Bearing parts most use rolling bearing; 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 bearing can use magnetic bearings or ceramic ball bearing. In the various types of bearings, with the use of the rolling bearing is common. 1, 2, double row cylindrical roller bearings, double row centripetal thrust ball bearings, double row tapered roller bearings, 4, 5, double row cylindrical roller bearing with flange single row circular cone roller bearings spindle bearings with spring configuration according to the accuracy of bearing parts, stiffness, temperature rise and the complexity of the structure, the rational allocation of bearings, can improve the precision of main drive system. Before the configuration form, bearing adopts the 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 synthetical stiffness of bearings, meet the requirements of power cutting, widely applied in all kinds of CNC machine tools. Front bearing with angular contact ball bearings, 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 bearing parts, front and rear bearing adopts diagonal contact ball bearing, to bear radial load and axial load, this configuration is suitable for high speed and light load and the precision of the nc machine tool bearings. Before bearing with double row taper roller bearings, bearing 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 bearing rotating speed and precision is restricted, suitable for medium accuracy, low speed and heavy load of nc machine tool bearings. Machine tool spindle bearing preloaded and the reasonable choice of bearing roller bearing preload preload, can improve the rotation accuracy of bearing parts, stiffness and vibration resistance. The adjustment of the rolling bearing clearance or preload, usually by the relative axial bearing inner and outer ring movement. Machine tool spindle bearing inner ring mobile this kind of method applies to 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. There are several mobile preloaded form of bearing inner ring, some bearing structure is simple, prestressing quantity is not easy to control, but is often used for light load machine tool bearing parts. With the right nut restricted the movement of the inner ring, easy to control prestressing quantity. On the flange bearing uniform several screw to adjust the amount of the movement of the inner ring, easy to adjust, but with a few screw adjustment, easy to make washer skewed. Will be close to the bearing right gasket made two and a half ring, can be radial, grinding can control the thickness of preloaded quantity, the size of the adjustment precision is higher. Using fine thread adjusting nut, facilitate micro-adjustment, and after the set to lock locking. Above is the structure of machine tool spindle bearing, if you want to know more, you can go to visit my company, my company has industry engineers for your answer, I plant the production of high precision machine tool spindle bearing, good quality, well received by old and new users. Tags: the structure of the spindle bearing