NTN bearings are mass-produced mechanical parts, and the manufacturing precision is very strict, and the degree of technical specialization is very high. Therefore, for most of the easy-to-buy bearing types, it should be more cost-effective to buy than in the following cases. Next, consider the bearing repair problem, namely:
(1) A large number of bearings of the same type used in large factories are mainly in the form of wear on the rolling surface, fatigue or fretting abrasion, especially the damaged parts are mostly cages or rolling elements, and the ferrules or gaskets are still repaired. value;
(2) Large and extra large bearings, which have no major damage to the parts due to failure or failure, or expensive NTN bearings must seek to extend their useful life;
(3) Some types of bearings that are really difficult to purchase, have no spare parts after failure and have to be repaired, especially imported bearings;
(4) The bearing has slight damage, such as slight rust generated during the inventory period, and slight fretting abrasion caused by transportation. It is a pity that such repair is easy and abandon.
In addition to economics, the repair of NTN bearings is technical, which requires the repairer to fully understand the corresponding technical requirements of the bearing, and the structural, technical and material characteristics of the bearing and its parts, otherwise it is difficult to guarantee the repair of the bearing. Have the desired effect.
In the business of repairing bearings, if the cooperation of professional bearing companies can be obtained, the following benefits may be obtained:
(1) The technical requirements of each process of repair can be clarified, and how to ensure the overall quality of the repaired bearings,
(2) It is possible to utilize many of the specialized experience of specialized bearing plants, which can reliably, efficiently and economically meet process requirements;
(3) It is possible to order a tool for a professional bearing company, which can be economical and saves a lot of trouble;
(4) Orders such as cages, rolling elements, rivets, etc. can be ordered from professional bearing companies, which may make the repair work simple, convenient and economical.
If the NTN bearing is mounted on the adapter sleeve, determine the direction of the housing. The nozzle tip of the housing cap should always be on the other side of the adapter nut. Care must be taken in the direction of the entire housing as the top cover and base must be installed in the original orientation.
1. Bearing installation and disassembly are sometimes involved; the movement of heavy objects, the use of tools and other equipment, or the use of high pressure oil.
2. Make sure the environment is clean.
3. Check the size and shape tolerances of the journal.
4. Check that the surface roughness Ra of the support surface is not more than 12.5 μm. The flatness tolerance should be IT7. For applications with lower requirements, IT8 is available.
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