Introduce you to the method of identifying refurbished bearings

Upload Time:

2021-11-10

Bearings are common parts in mechanical equipment, and they are also important parts. The use of bearings is also very extensive. In order to earn more money, there are many unscrupulous merchants who recycle some used or unused old bearings and use them as new bearings to buy after treatment. There is still a big difference between this refurbished bearing and a good bearing. The performance It is not as good as a good bearing. According to the understanding of bearing knowledge, today I will share with you how to distinguish whether the bearing is a refurbished bearing when buying a bearing.

1. Refurbished bearings are generally limited by the technology and equipment of small bearing manufacturers, so the bearing precision is low, the bearing surface is rough, the chamfer size is uneven, and some have black skin and pitting.

2. Some low-quality bearings are made of ordinary steel, carbon steel, malleable steel, and iron pipes, etc., and the appearance of these materials is mostly whitish, and the color of special bearing steel is greenish, but it cannot be completely determined just by looking at the color. Hardness, the hardness of ordinary steel is low.

3. Some small manufacturers have simple fire dipping technology, and the bearings will be heated unevenly and slightly deformed.

4. Rotate the bearing to see if the bearing rotates evenly and the sound is continuous without noise.

5. Look at the cage. The regular manufacturer’s bearing cage is regular and free of burrs. The riveted bearing cage has the same size as the rivet pier head. The processing technology and equipment of the irregular manufacturer are simple, so the cage is rough, and some riveted structure cages are evenly divided. With or on the deviation, the size of the rivet pier head is different or the riveting is biased.

6. Look at the packaging. Regular manufacturers have the same packaging, and the fonts on the packaging are clear. Some counterfeit bearings have inconsistent packaging, or are simple and irregular.

7. Look at the font on the end face of the bearing. The original bearings are very clear and even, whether the steel font or the laser font. The laser font has a certain depth. The counterfeit bearing font has broken marks. After the font is wiped with gauze, it will leave blurred traces of the font.

8. Look at the certificate of conformity. The bearings of regular manufacturers all have certificates of conformity and the certificates are of the same size. Most of the certificates are made of oil-proof paper. The font is clear, and some manufacturers have query information on the certificate of conformity, and some of the counterfeit certificates have blurred fonts. The paper is ordinary paper, and the certificates are of different sizes. It is recommended to keep the formal manufacturer's certificate for comparison and reference.