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FAG machine tool spindle bearings with polyamide cages New series B70..-TVP-P4

by:JNSN     2022-03-12
With polyamide cage series B70..-TVP-P4 is fast, quiet and efficient Figure 1: FAG ball-guided polyamide cage FAG spindle bearings significantly reduce installation and commissioning times FAG spindle bearings are manufactured under the highest cleanliness conditions , while using the most advanced cleaning technology. Therefore, product quality can be guaranteed 100% through the final noise inspection. Thanks to the application of cleaning conditions, protective measures and other chemical agents, the spindle bearings are lubricated and mounted directly at the end customer without the need for additional cleaning steps. Roller-guided FAG spindle bearings with the P4 suffix can increase the grease distribution speed by about 30%. Technical advantages of main shaft bearings ■ Compared with competitors' products, higher limit speed, Figure 3 ■ Fast and effective ■ Very little noise ■ Efficient installation and commissioning ■ New ball-guided polyamide cage TVP ■ Bearing QR code: for High level of security for counterfeit bearings ■ Width tolerance markings on bearing surfaces and outer packaging ■ Wide range of available dimensions, Figure 2 ■ To withstand continuous high loads. Fields of application ■ Milling machine spindles in the medium speed range ■ Externally driven spindles ■ Machining center spindles ■ High-speed motors. The rigidity of a rigid bearing set depends on the bearing arrangement and preload. The rigidity of the overall system of the machine tool depends not only on the rigidity of the bearing but also on the rigidity of the shaft and the bearing seat. In the actual application process, the rigidity can be increased by the method of installation and operation. Axial stiffness Axial stiffness ca is the ratio of axial load to axial displacement. ca N/m axial rigidity, see dimension table Fa N axial load a m axial displacement. Unloading force Unloading force KaE is defined as when the axial external force Fa through the center of the bearing is greater than a certain value, the preload of the oppositely installed bearing is reduced to the axial force when it is just unloaded. For example, bearing No. 2 is reduced in force under external axial load and can be unloaded, Figure 4. Speed u200bu200blimit speed The speed that can be obtained by any kind of bearing depends on the proper coordination between the components and the overall energy balance. The decisive factors are: ■ Number of bearings ■ Bearing arrangement ■ Internal load (preload class) ■ External load ■ Lubrication ■ Heat dissipation. The limiting speeds given in the bearing tables are based on the speed capability of the individual bearings under elastic preload and as guide values u200bu200bwhich may vary due to actual operating conditions. However, they give an indication of the speed capability of a single bearing at relatively low loads, using good heat dissipation and elastic preload. The data for grease lubrication is valid when adding Schaeffler's recommended amount of high-speed grease. The reduction factor is reduced in the case of a rigid bearing preload or high preload (for better spindle rigidity) and in the case of matched bearings and bearing sets. The speed in the dimension table must therefore be multiplied by the deceleration factor. The coefficient fr is shown in Table 1. This deceleration factor is valid for continuous motion within 5 h of bearings with steel balls and polyamide TVP cages. For continuous operation of more than 5 h and grease lubrication, an additional reduction factor of fr u003d 0,85 is required for the above bearings. Calculation example O-arrangement bearing B7014-C-TVP-P4-ULnG Grease lubrication u003d 12000min1n 5 h u003d 12 000 min1 0,8 0,85u003d 8160 min1 Grease addition amount Different types of bearings require different amounts of grease . The recommended grease storage space should match the space inside the bearing that is not interfered by rotating parts, see Table 2. Table 1: Geared Spindle Bearing Sets Table 2: Recommended Additions of B70 Series Spindle Bearing Greases Bearing Arrangement Design Shaft and Housing Machining Tolerances For the recommended machining tolerances of the shaft and housing mating surfaces that mate with the spindle bearings, see Tables 3 and 4. In order for the performance of the main shaft bearing to be fully embodied and utilized, the adjacent structures must be properly designed. Spindle Bearing Accuracy The tolerances of the inner and outer rings of the spindle bearing are shown in Table 5 and Table 6. Spacer Ring Machining Tolerances For recommended machining tolerances for inner and outer spacer rings, see Tables 7 and 8. Unless explicitly noted on the drawing, the inner and outer spacers must be the same length. To achieve this purpose, the end faces of the inner and outer spacer rings are processed by one clamping and grinding. Table 7: Machining tolerances for inner ring spacers1) Including end faces. Table 8: Machining tolerances for outer ring spacers1) Including end faces. The deviation of the nominal diameter of the hole d2 Cylindricity Axial runout Parallelism Radial runout Roughness 1) Bearing model The spindle bearing structure is shown in Figure 6. Bearing identification FAG machine tool spindle bearings have a uniform identification system on the end face of the bearing ring, see Figure 7. In addition to the actual bearing designation, information is also included: ■ Tolerances on the bearing bore and outside diameter ■ Tolerances on the bearing width ■ The mounting position is marked on the outer surface of the outer ring (contact angle designation).
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