1 deep groove ball bearings
This kind of bearing is generally used to bear radial load, the clearance is not adjustable, so commonly used in less precision, without pretension occasions such as ordinary drill spindle.
2 angular contact ball bearings
Such bearings can withstand the radial and axial load will cause the internal axial force in the radial load, and hence, into the installation, configuration back to back "," face to face ", the" series "and" the League, and preload can improve the stiffness of the spindle. Type of bearing contact angle of 15 °, 25 °, 40 ° Among these three, the contact angle of 15 ° B7000CY high precision angular contact ball bearings designed specifically for high-speed grinding spindle bearings, the bearings in addition to the internal structure design changes, the rings and rolling bodies are made of high quality the electroslag bearing steel. Cage materials for phenolic cloth laminated tube, tolerance levels 5,4 and 2. Therefore, this type of bearing with high rotation accuracy and limit speed, friction, low temperature rise.
3 two-way thrust angular contact ball bearings
230 000 type usually used two-way thrust angular contact ball bearings, the contact angle of 60 °, by the seat ring with lubrication holes, two shaft washer, a spacer and two sets of ball and cage components. Select the appropriate spacer height bearing assembly with the required pre-load.
This kind of bearing can withstand the bidirectional axial load, has a good rigidity, normal lubrication of low temperature, high speed, and ease of assembly and disassembly, as a new structure, used for grinding machines, lathes, boring machine, milling machine, drilling machine spindle use often equipped with double row cylindrical roller bearing group.
4 double row cylindrical roller bearings
Type of bearing can bear greater radial load and allows a higher speed. Two roller bearings arranged to cross the rotation fluctuation frequency than single row bearings to double the amplitude reduced by 70%. Common kind of bearings come in two forms: NN30/W33 NN30K/W33 two series bearing inner ring with ribs, separable outer ring; NNU49/W33 NNU49K/W33 two bearing outer ring with ribs, detachable ring, which NN30K/W33 and NNU49K/W33 series inner tapered bore (taper 1:12), compatible with the spindle taper journal, axial movement of the inner ring, allows inner swell in order to reduce The small bearing clearance or preload bearings. The cylindrical bore bearings commonly used thermal loading, the use of interference fit reducing the bearing clearance or preload to achieve the purpose. Series bearings separable the NNU49 of the inner ring, usually in the inner ring mounted on the spindle and then for the finish of the raceway, to obtain a high spindle rotation accuracy.
5 Tapered Roller Bearings
Both radial and axial loads, double row tapered roller bearings can accommodate axial loads. Tapered roller big end and the inner ribs of sliding friction between the speed limit is often lower than the same size cylindrical roller bearings. Hollow tapered roller bearings available oil cooling roller, so that the temperature rise to reduce, thereby increasing the speed allowed. But the bearing manufacturing process complexity, the requirements of machine tool lubrication system is also higher, generally used only for horizontal spindle with special requirements.
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