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The calculation of the bearing assembly, through theoretical analysis shows that the size of the deviation of the general bearings supporting parts to meet the requirements of the finished bearing width deviation, so the bearing assembly can be used interchangeably law. In this way, the production site, the bearings are also part of the selective assembly method finished product and sets. But in actual production, the impact the factors bearing width is not just the size deviation shape and position deviation; addition, the angle deviation of the mating parts of the bearing width.
Sorting can be the size of a bearing roller mutual difference control in a small range, which laid the foundation for the satisfaction of the finished bearing width. Thus, as a new technology, a random method for assembling generated. Final processing, the error many factors affect the size of the roller, random error and systematic errors. Directly adjacent a few grains roller mounted within a set of bearings, the separation step can be eliminated to achieve the same assembly quality. But either error, in a very short period of time, they cause the adjacent roller the little mutual Poor size.
The standard specifies the separable outer ring must have interchangeability, selective assembly, not the outer ring sorting. For other supporting parts, arrange final inspection classification process to select the parts together sets.
The technological characteristics of the die casting method:
1, easy to implement mechanization to improve labor conditions.
2, high material utilization and reduce costs significantly.
3, die casting, metal crystal solidification, meticulous organization, good surface quality, solid wearable.
However, die-cast aluminum alloy cage, large-tonnage die casting equipment, and more complex molds and manufacturing, die casting, easy to make the cage pockets strain. In the bearing to withstand shocks, vibration and speed-changing conditions, but also to further improve the quality of the die-casting the holder.
4, holder directly die casting molding, can be obtained good geometric shape and size precision, eliminating the need for the entity to maintain the mechanical processing of the the frame rolling element pocket hole, high production efficiency.
Affect Rolling radial clearance or width of factors, mainly the inner and outer ring raceway diameter deviation and the diameter of the rolling element deviation. Such a manufacturing error is not meet the the supporting needs Rolling interchangeable. Because the Rolling the importance of the work, making the very strict on the the clearance value or width tolerance requirements. At present, in the case of mass production, the economic bearing parts machining accuracy range more than 0.04-0.05mm. Only individual having a separable ferrule bearing only interchangeable assembly methods. Therefore, for a rolling bearing assembly, can not generally interchangeable assembly methods, but can only be used to select the method of assembly. In China, most of the rolling bearing radial clearance and width tolerances have been standardized. Small to medium-sized deep groove ball bearings, for example, the tolerance range of the radial clearance is only 0.01-0.02mm.
The inner and outer ring raceway diameter within the tolerance range are grouped according to size difference and then match the appropriate size of the inner ring, outer ring and rolling element, in order to achieve the technical standards or the existing pattern provides clearance value or bearing width tolerance. Such a process called selective assembly of rolling bearings (optional).
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 7201ATYNP5 NSK | 12 | 32 | 10 |
| 7201A5TYNP5 NSK | 12 | 32 | 10 |