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FAG Machine Tool Spindle Bearing Assembly Scheme

by:JNSN     2022-03-17
It must be ensured that the rolling contact surfaces are fully lubricated when the FAG machine spindle bearing is installed. The dimensional accuracy of adjacent structures must be checked. If you want technical support for the initial installation, we recommend that you consult an industrial service specialist, see page 146, chapter Equipment and services for rolling bearing installation and maintenance. Single bearing solution In the single bearing solution, the compact design of the high precision bearings YRTS and ZKLDF is different from the mounting of the crossed roller bearings given in the TPI catalogue. High-precision bearings are in accordance with catalogue TPI 120, and high-precision bearings mounted in catalogue TPI 103 (high-precision bearings with combined loads) are given. Crossed Roller Bearings Crossed Roller Bearings Z-556 are supplied with a specific axial preload already set internally. For crossed roller bearings Z-549, the axial preload is set during installation. When installing a double bearing solution, on the one hand it must be ensured that the thrust deep groove ball bearings and the angular contact ball bearings run well radially. This can be done by centering the device or by aligning the axial retaining ring. On the other hand, the axial preload must be set correctly by means of angular contact ball bearings. A three-bearing solution must ensure that the thrust deep groove ball bearing performs well in the radial direction relative to the radial cylindrical roller bearing. This can be achieved by centering equipment or by centering operations. Radial cylindrical roller bearings must be mounted with a specific radial preload, see Catalogue SP 1, GMN Super Precision Bearings. Particular attention must be paid to the preload of the thrust bearing. Single bearing solution Crossed roller bearings are used here due to the limited size range of the thrust/radial bearing YRTS and the thrust angular contact ball bearing ZKLDF (see TPI 120, High-precision bearings for combined loads). These bearings are characterized by a simple peripheral structure, a small design space, and easy lubrication. Two-bearing solution A two-bearing arrangement can meet the requirements of most applications. The main way this type of bearing arrangement is a preloaded thrust bearing and another bearing which preloads the thrust bearing and fulfills the radial guiding function. This bearing solution can meet medium and high speed requirements. Angular contact ball bearings and tapered roller bearings can perform this function. Three-bearing solution In applications where high precision and rigidity are required, the three-bearing configuration scheme has significant advantages. However, the increased workload due to installation must be considered. Single Bearing Solution Features In single bearing solution applications, all loads are carried by a single bearing. This makes the peripheral structure of the bearing simple and compact. In addition, it is not necessary to align the individual bearings with each other, and lubrication is relatively simple since only one bearing needs to be lubricated. Crossed Roller Bearings These bearings have rollers that are inclined relative to the shaft, and the rollers are mounted in a continuous crossing pattern. Separate the rollers with plastic cages. The machining accuracy of these bearings is P5, and the running accuracy is better than P4. Crossed roller bearings are available in the form of adjustable preload or fixed preload. High running accuracy In addition to the crossed roller bearings described here, the thrust/radial bearings YRTS and ZKLDF in the diameter range from 200 mm to 460 mm are also suitable for these applications. Axial/radial bearings ZKLDF can be produced with bore diameters up to 1030 mm. Bearings in these series are more precise than THK crossed roller bearings see TPI 120, High Precision Bearings for Combined Loads. Characteristics of a two-bearing solution Compared to a single-bearing solution, the load carried by a two-bearing solution is shared by both bearings. The thrust bearing mainly bears the weight of the table and the workpiece. Angular contact ball bearings are used to provide radial support while preloading the shafting axially. If thrust roller bearings are used, the system can withstand very high loads. Thrust ball bearings are recommended for high speed applications. During the design and installation process, it must be ensured that the minimum load can be satisfied under various load conditions. This also affects the recommended paired bearing arrangement. In terms of rotational speed, a two-bearing solution using ball bearings is a better choice for friction, lubrication and high precision. Accuracy Dimensional and geometric tolerance accuracy is mainly determined by the larger thrust bearing. The radial runout of the system is influenced by the smaller diameter angular contact ball bearing. Three-bearing solution characteristics In this arrangement, the combined load is appropriately distributed to two thrust bearings and one radial bearing. This requires separate consideration of design requirements. Appropriate preload must be selected according to the load conditions to ensure minimum axial load. Lubrication must be given special consideration. Although thrust bearings require more oil to dissipate heat, more oil is not necessary for radial cylindrical roller bearings at high speeds. By design, radial bearings can in most cases be lubricated by the smaller thrust bearing above, see page 124. Rigidity The high rigidity of the bearing system can be achieved by the fixed axial preload between the two thrust bearings and the radial preload of the radial bearing. The radial preload is generally up to 5 m
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