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High-precision bearings for printing machines

by:JNSN     2021-12-29
High-precision bearings for printing machines Printing machine bearings are used for the main cylinders of sheet-fed printing machines and web printing machines. Because of their load-bearing capacity, rigidity, precision and precise adjustment performance, they meet the core requirements of the perfect support of the printing press, that is, the highest printing quality requirements. These bearings are specially designed for each application in close cooperation between our application technicians and the printing press manufacturer. Therefore, they can well meet the needs of customers. It is very important to match the design for a specific machine plan, because too high a requirement is a waste of resources, and too low a requirement will reduce the performance of the machine. However, it is not easy to find the best solution in terms of bearing arrangement. The Schaeffler Group has extensive experience in bearing research and development, design and production, and its expertise can always provide the best solutions for complex bearing applications. Moreover, we can also consider both technical and economic aspects. Comprehensive solutions to meet the best printing quality Due to the complexity of application requirements, only a small part of printing machinery bearings can be standardized. Therefore, printing press bearings include many models and sizes. In addition to the typical multi-row, high-precision cylindrical roller bearings NN, NNU, N4N, N4U, it also includes floating bearing units with or without eccentric rings, positioning bearing units, polygonal bearings, linear and rotary bearing combined units, and tapered rollers Sub-bearing unit. There are two kinds of bearings with seal and without seal. The journals at both ends of the drum can be cylindrical or conical. Printing machinery bearings are economical bearing arrangements that can meet the requirements of printing machinery for high output, low maintenance costs, and excellent printing quality. The current state of the art Schaeffler Group has issued this latest sample TPI 222 to replace the sample LFD. The data in the sample reflects the technology and manufacturing level as of January 2014. Not only reflects the progress of rolling bearing technology, but also includes experience in practical applications. In previous publications, any information that differs from the data in this sample is invalid. Technical requirements: Printing press bearings are used for the center positioning of the plate cylinder, blanket cylinder, impression cylinder and transfer cylinder. This means that the bearing must meet a series of requirements as much as possible. The accuracy of the roller bearing arrangement has a decisive influence on the printing quality. Printing press bearings must ensure that all cylinders can work together optimally during the printing process. There must be no relative movement in the radial and axial directions. Therefore, the bearing must meet high requirements in terms of zero clearance, rigidity and running performance. Moreover, it must be possible to control the axial movement of the plate cylinder to achieve skew adjustment (diagonal registration function). Changing the center distance of the printing press cylinders In order to perform the functions of the printing press, such as pressing, separating or compensating for different paper thicknesses, the center distance of the cylinders must be changeable. For this reason, printing machinery bearings have an eccentric ring that can rotate a certain angle reliably and with low friction, Figure 1 and page 13, Figure 2. The advantages of printing press bearings Compared with standard bearing solutions, the printing press bearings provided by Schaeffler Group bring a series of benefits to users, as shown in the table below. Advantages Figure 2 Positioning by eccentric bearing ring 0001867F Advantage description High precision is achieved by bearing accuracy (tolerance class P5 or P4) and bearing preload. Therefore, the bearing arrangement is zero clearance. The high-precision and combination of high-rigidity bearing parts, as well as preloading, ensure the high radial rigidity of the system. Reliable eccentric adjustment The rolling bearing-based swing bearing realizes reliable, low-friction eccentric adjustment and prevents jamming and early failure. Optimized structural design for low operating temperature, with low bearing running friction. Therefore, the temperature rise is very low. The compact structure combines all the required functions in one bearing unit. The number of parts is reduced, the operation is simplified and it is more economical. There are obvious advantages in the installation of easy bearing units. Since multiple functions are combined into one bearing, installation is easier and safer.
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