Nowadays many bearings are defective, what does that mean? That is to say, it is an unqualified bearing, and there is no specification for the use of the mold guide sleeve. The primary reason is that the factory inspection is not severe, so that the bearing becomes a defective product. Such a bearing is assumed to be used, then such a Bearings generally do not use a few days to damage, or can not be used at all, in the application will also lead to mechanical damage, so the rolling bearing does not fit the standard bearings can not be used, know? Do not use such bearings. We should use bearings, it is best to use imported bearing products, because the inspection of imported bearing companies is more stringent, generally do not present quality problems, of course, there are exceptions to oil bearings, we must completely avoid buying bearings that are not in conformity with specifications. Then you should learn to distinguish the quality of the bearing yourself. Let us introduce the common sense in this regard.
When selecting the bearing, we first investigate the appearance of the bearing, and can judge whether it conforms to the specification through the appearance of the bearing. The appearance of the bearing should be viewed under the astigmatism lamp, and the bearing's appearance, cracks and other parts should be carefully investigated. Let's talk about the specific method. This method is not only suitable for imported bearings, but also able to determine whether other brands of imported bearings meet the specifications.
1. Various cracks, such as original data cracks, forging cracks, heat treatment cracks and grinding cracks. These cracks will become a source of stress and agilely expand in the future bearing operation, forming a bearing break, bearing life and Job safety has a huge impact.
2, rust, black skin and pitting, the latter two are the shortcomings of simple storage of water and dirt, the simplest development into rust. Corrosion is a source of pollution that leads to poor installation, early wear and fatigue, and severe corrosion can void bearings.
3, peeling and folding, the two shortcomings are not firmly combined with the base metal, and there are often decarburization or carbon depletion around them. The data is simply collapsed, embossed or worn, which is very good for bearing life and precision. unfavorable.
4, a variety of mechanical scars, such as abrasions, scratches, crushes, bumps, etc., will form a poor bearing installation, causing eccentric load and stress gathering, forming a reduction in rotation accuracy and service life.
5, the quality of the riveting or welding of the cage, the first investigation of whether the rivet head is biased, tilted, slack, lack of meat or "double eyelids", the orientation of the welding is correct, the welding point is too small, is not welded well Or excessive welding causes the phenomenon of getting stuck in the roll.
6. Others such as poor typing quality, such as illegible handwriting and damage, should be considered as defective products, and severe ones may not be tested.
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