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Talking about: Five types of rolling bearings commonly used in the machine tool industry

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1. Deep groove ball bearings These bearings are usually only used to accept radial loads; because the clearance is not adjustable; so it is often used in applications where accuracy is not high and no preload is required; such as the usual drill spindle.
2. Bearings of angular touch ball bearings can accept both radial and axial loads; because they will cause internal axial forces when subjected to radial loads; therefore, they should be used as devices; their equipment methods are “back to back”, “face to face”, “ Series" and "multiple", etc.; and pre-tightening can improve the rigidity of the main shaft. The contact angle of these bearings is 15°, 25°, 40°; the B7000CY high-precision angular touch with a touch angle of 15° The ball bearing is a special bearing specially designed for the spindle of high-speed grinding machine; the bearing is modified except for the internal layout; the ferrule and the rolling body are made of high quality electroslag bearing steel. The cage data is phenolic laminated tube; Grades are 5, 4 and 2. Therefore; these bearings have high rotational accuracy and limit speed; conflict. Law.
3. Two-way thrust angle touch ball bearings usually use 230,000 type two-way thrust angle touch ball bearings; the touch angle is 60°; a seat with smooth oil holes, two shaft rings, one spacer ring and two sets of steel balls and cage assemblies Composition. Choosing the appropriate spacer height allows the bearing to have the required preload after installation.
This type of bearing can accept two-way axial load, has excellent rigidity, low temperature rise during normal smoothing; high speed; easy to assemble and disassemble; as a new layout; currently used for grinding machines, lathes, boring machines, milling machines, drilling machines, etc. Upper; use medium and double row cylindrical roller bearings.
4. Double row cylindrical roller bearings can accept large radial loads and allow higher speeds. The two rows of rollers in the bearing are placed in the insertion method; the rotation frequency can be doubled compared to the single row bearing during rotation; amplitude The drop is 70%. There are two ways to use this type of bearing: NN30/W33, NN30K/W33 two series bearing inner ring with rib; outer ring can be separated, NNU49/W33, NNU49K/W33 two series bearing outer ring belt The inner ring can be separated; the inner ring of NN30K/W33 and NNU49K/W33 series is a tapered hole (taper 1:12); cooperate with the tapered journal of the main shaft; move the inner ring axially; Large; to reduce the bearing clearance and even pre-tightening the bearing. Cylindrical bore bearings are usually hot-filled; use interference to reduce bearing clearance; perhaps reach the pre-tightening intention. NNU49 series bearings that can be separated from the inner ring; usually After the inner ring is mounted on the main shaft, the finishing of the raceway is performed; to achieve high spindle rotation accuracy.
5. Tapered roller bearings can accept both radial and axial loads; double row tapered roller bearings can accept biaxial axial loads. Due to the sliding conflict between the large end of the tapered roller and the inner ring rib; the limit speed is often lower than the same Cylindrical roller bearings of the scale. Hollow tapered roller bearings can be used to cool the rollers; the temperature rise is reduced; then the speed of the promise is improved. However, the bearing manufacturing process is messy; the demand for the smooth system of the machine is also high; usually only For horizontal spindles with special needs.

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