Bearings are an important part of mechanical equipment. Its main function is to support the mechanical rotating body, reduce the friction coefficient during its movement, and ensure its rotation accuracy. In production and processing, once fake and shoddy bearings are used, the consequences will not only lead to machine maintenance and shutdown, but also cause losses to the company. The importance of bearings in contemporary mechanical equipment is self-evident, but the annual maintenance costs and shutdown costs caused by bearing damage are at least nearly one million, and the indirect losses are even greater. A big reason is that the bearings bought back are counterfeit. I believe that there are too many people who have encountered such incidents. When we install and maintain the bearings, the first thing is not to buy fake bearings. 01 There are mainly 8 kinds of fraudulent methods in bearings 1. Manufacturing bearings with iron and carbon steel (not enough hardness) and repairing waste bearings (not enough precision); 2. Putting inferior bearings and small factory bearings on the trademark of big manufacturers, counterfeiting products from famous big manufacturers 3. Fake users, distributors, agents of famous manufacturers, and even counterfeit the spot sales offices of manufacturers; 4. Use defective bearings to pretend to be genuine bearings; 5. Put ordinary bearings as high-precision series 6. Good products are mixed with fake products; 7. Fake products are sold at genuine prices, genuine products are sold at high prices, and fake prices are used; 8. If you want cheap products, give fake products, and if you want good quality, give real products. 02 The impact of counterfeit bearings 1. The service life is short. Bearings will be damaged in advance during use, directly increasing the budget of the enterprise and causing economic losses; 2. Dangerous accidents easily caused by counterfeit bearings. Counterfeit bearings are highly damaged, causing the machine to suddenly rotate abnormally, stop suddenly, or cause heat and fire; 3. Disturb the relationship between bearing market procurement and distribution. In the face of interests, it destroys the integrity of each other, causing bearing manufacturers to be difficult to distinguish and users to distrust. 03Characteristics of counterfeit bearings 1. The appearance is basically the same as the real one, but its bearing capacity, limit speed, etc. do not know whether it is in line with the purpose; 2. In order to reduce manufacturing costs, there is no requirement for precision; 3. In order to reduce prices, low-quality bearings are used Bearing steel material; 4. Packaging, transportation and handling methods are not standardized, which will have a negative impact on the accuracy of bearing products. 04 Brands of bearings on the market 1. Well-known foreign bearing brands: Sweden, Japan NSK, and American TIMKEN; 2. Domestic well-known bearing brands: Luoyang Bearing, Wafangdian Bearing, Harbin Bearing; bearings are not absolutely good or bad. It depends on how you use it and where you use it. There are also NACHI, Tianma TMB, Renben C&U, Qianchao QC, Changjiang CJB, IKO, ZYS, AAA Bearing, South NF, TEKT, Xiangzhou ZXY, NBR Bearing, Longxi LS and other brand bearings. 05 There are five steps to identify bearings 1. Outer packaging and certificate of conformity A. Whether the outer packaging is clear: In general, genuine factory brands have their own special designers to design the outer packaging, and arrange factories that pass the production conditions to produce , so the packaging is very clear and unambiguous from lines to color blocks. B. Whether the certificate of conformity is standardized: a. There is a watermark in the certificate of conformity of the bearing produced by Zhengwan Wafangdian, and there is the word 'ZWZ' in the watermark, but there is no such mark in the fake certificate of conformity; b. The certificate of conformity of Luoyang Bearing There is an anti-counterfeiting identification number; c, Japan NSK has no certificate of conformity. The certificate of conformity is unique to our country. 2. Steel stamping A. There will be brand words, labels, etc. printed on the bearing body; B. The font of the domestic steel stamping is very small. Most of the products produced by the original factory use laser etching, and the bearings are embossed before heat treatment, so the font Although small, it is deeply concave and very clear. The fonts of counterfeit products are not only blurred, but due to the rough printing technology, the fonts float on the surface, and some of them cannot be easily erased by hand; You can feel the presence of the steel seal by touching it lightly. For general domestic bearings or imitation bearings, the steel stamps are protruding or recessed on the surface of the bearing. 3. The overall situation A. Whether the appearance quality is poor, the processing quality is poor, and the circular runout is obvious. The bearing belongs to a class of precision mechanical products, and the surface roughness must be below 1.6; B. Whether there is turbid oil stains, domestic bearings are easy to leave Thick oil stains, sticky and sticky in the hand, with an obvious smell of anti-rust oil. There are almost no traces of anti-rust oil on the imported bearings; C, whether it is genuine, the inner hole of CAK is not tapered, and the 2RS has only one-sided seal and other obvious errors in specifications and models. 4. Whether the metal luster bearing is of high quality depends on the level of steel and heat treatment.
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