How to look at the quality of a bearing

1 First look at the materials used in bearing steel, Germany FAG bearings are produced by their own professional steel mills, in terms of hardness and precision are higher than counterfeit FAG bearings.
2 Using high-input marking equipment, in order to establish a corporate brand image and prevent products from being counterfeited, FAG bearing manufacturers have adopted laser marking machines, hoping to establish a corporate image and connect with the international market, while using high input to control products being counterfeited, however, Because the laser marking machine uses computer control, the advantages of easy editing of marking fonts and sizes can not only effectively prevent counterfeiting, but also increase the difficulty for counterfeiters.
3 observation method. The rolling bearing should be observed with the naked eye. The inner and outer raceways should have no peeling marks and severe wear and be in the shape of a circular groove; all the rolling elements should be free of spots, cracks and peeling; the cage should not be loose, damaged or worn. , the gap with the rolling element is not too big.
4 feels. The gap between the inner and outer races of the normal bearing and the rolling elements is 0.005 to 0.010 mm. For rolling bearings that have been used for one stage, when the inner race is pinched with your fingers for axial sway, there should be no obvious squeaking noise.
5 rotation method. Hold the inner race of the bearing with one hand and turn the outer race with the other hand. The bearing should be able to rotate flexibly and the radial sway should not be felt.
6 Of course, it depends on the price. If the price is much lower than normal, it may be a fake proposal. Don't buy it. After all, a penny is worth the price. It is really expensive after all, so the import is very expensive.
During the inspection, the above five empirical methods should be combined to facilitate the correct judgment of the technical state of the rolling bearing. For tapered roller bearings, it should also be observed whether the rolling elements are located in the middle of the outer race. If there is a forward movement, it should not exceed 1.5 mm.
In addition to the above-described discrimination method, it can be distinguished from color and precision. At the same time, you can also refer to other imported bearing brands, iko bearings, Sweden SKF bearings, the United States TIMKEN bearings, Japan NSK bearings, koyo bearings and other methods of distinguishing authenticity.

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Measures to save the roller bearing ring from failure

Small bearings are different from extra-large bearings. They are single-machine, single-person, single-piece machining. They are extremely random and can easily cause dimensional tolerances or shape tolerances. For example, after machining, the grinding amount is too small, the heat treatment deformation is excessive, and the shrinkage is caused. Excessively large and uneven shrinkage, carburized padding and handling of card injuries. If processed in the normal process, these parts will become unqualified. Haina Ruiri Co., Ltd. provides some solutions.
1 Center offset method
1.1 Saving the inner and outer diameter of the bearing ring
Firstly, the size of each defect (asymmetric type) existing in the part is accurately measured, and the minimum amount of grinding (the amount of grinding to the deviation of the finished product size) M is calculated, and then the center is offset at the time of grinding ( To offset the direction in which the amount of wear is increased at the defect, the maximum offset is M/2, that is, the relative amount of wear at the defect is increased, and the focus is sharpened.
1.2 Rescue of the inner and outer raceways of the ferrule
The design standard of the grinding ring of the bearing ring is the inner diameter or the outer diameter, that is, grinding the inner (outer) diameter and grinding the raceway first. Taking the inner ring as an example, if there is an asymmetrical defect in the inner raceway, it is necessary to accurately measure the The inner diameter of the part is calculated, and the maximum grinding amount M and the maximum grinding amount M1 at the inner raceway defect are calculated. When M1<M, the inner ring center offset is required when grinding the inner diameter, and the maximum offset is M1/2, that is, when the inner diameter is processed, the inner raceway defect is firstly increased in advance, and then the grinding is performed. When the raceway is rolled, the defects will be sharply ground and the waste will be saved. When M1 ≥ M, normal grinding can not be ground, according to the situation can be saved by the method described in section 1.1.
Grinding by center offset method is carried out under the premise of ensuring the hardness of the part and the depth of the carburized layer. The total offset cannot be completed in one offset grinding. Generally, it is divided into several grindings, that is, the offset test. Grinding - Measuring - Adjusting the offset - Repeat the process of re-grinding. After the defect has been worn away, re-align it and normal grinding to correct the ellipticity. This method is less efficient, and requires the operator to have a higher level of technology, but in this single-machine, single-piece production, this method has a higher success rate and does not delay the production schedule. After several years of practice, the effect is good.
2 Chemical deposition method
For bearing parts with dimensional tolerances exceeding the design criteria, chemical deposition can be used for salvage. The principle of chemical deposition is to uniformly produce a certain thickness of metal plating on the surface of the part through chemical reaction between various chemical materials, and to ensure the same hardness and mechanical properties of the metal layer and the part by additional tempering. Chemical deposition only increases the size of the part and does not change the shape tolerance of the part. Therefore, chemical deposition is an effective salvage method for parts with poor dimensional tolerance. At present, the maximum unilateral deposition thickness can reach about 0.1 mm.

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