1. Is the steel printing of the koyo angular contact ball bearing clear?
Each koyo angular contact ball bearing will have its brand name, label, etc. printed on the koyo angular contact ball bearing body. Although the font is very small, the products produced by the regular manufacturers are printed with the stamp printing technology, and the characters are pressed before the heat treatment, so the font is small, but the recess is deep and very clear. Under normal circumstances, the fonts of counterfeit products are not only blurred, because the printing technology is rough, the fonts float on the surface, and some can even be easily erased by hand or the hand marks are serious.
2.koyo angular contact ball bearing whether there is noise
Hold the inner sleeve of the bearing with your left hand, and rotate the outer sleeve with a small amount of reciprocating right hand to make it rotate, and listen to whether there is noise in the operation of koyo angular contact ball bearing. Due to the backward production conditions of most counterfeit products, the complete manual workshop operation, in the production process, the bearing body will inevitably be mixed with impurities such as dust and sand, so there will be noise or unsmooth operation when the bearing rotates. . This is the key to judging whether the product comes from a brand-name product of a regular manufacturer that is strict in production standards and operated by machines.
3.koyo angular contact ball bearing surface has turbid oil traces
Whether there is turbid oil on the surface of the koyo angular contact ball bearing, we need to pay special attention when purchasing koyo angular contact ball bearing. Since the domestic anti-rust technology has a certain gap with the foreign advanced manufacturing countries, it is easy to leave a thick oil trace when the bearing body is rust-proof, and it feels sticky and sticky when touched by hand, and foreign original There are almost no traces of rust preventive oil on the imported bearings. According to industry insiders, particularly attentive people can smell a special taste on the koyo angular contact ball bearing, which is the taste of anti-rust oil.
4. Is the chamfer of the koyo angular contact ball bearing uniform?
The chamfer of the so-called koyo angular contact ball bearing, that is, the intersection of the horizontal and vertical faces, the counterfeit koyo angular contact ball bearing is unsatisfactory in the processing of these corners due to the limitation of production technology. We can easily distinguish it.
5.KOyo angular contact ball bearing bearing packaging
After the koyo angular contact ball bearing is manufactured and tested, it is cleaned and rust-proofed, and then placed in the inner packaging to achieve waterproof, moisture-proof, dust-proof, shock-proof and maintenance bearings. Quality and precision as well as ease of use and sale.
The koyo angular contact ball bearing inner packaging is divided into three categories according to the rust prevention period:
1koyo angular contact ball bearing short rust-proof packaging: rust-proof period of 3 to 6 months, suitable for large-volume delivery to the same subscriber, the bearings will be put into use in a short period of time. According to the agreement between the two parties, the principle of convenient use is adopted, and simple packaging is adopted.
2koyo angular contact ball bearing general rust-proof period packaging: rust-proof period of one year, suitable for general purpose bearings.
3koyo angular contact ball bearing long anti-rust period packaging: anti-rust period of two years, suitable for special and precision bearings.
Koyo angular contact ball bearing inner packaging material is polyethylene plastic tube (box), kraft paper, plain and wrinkle polyethylene composite paper, carton, polyethylene or polyethylene plastic film, nylon fastening tape or plastic fastening tape, waterproof High-strength plastic belt, linen bag, etc. All of the above materials are required to ensure the corrosion resistance test of the material is qualified.
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