Bearings are common parts and key parts in industrial equipment, and the application of bearings is also very common. In order to make money, many businesses recycle some old bearings that have been used or have not been used as new bearings to buy. Today, LBCN Bearing will share with you how to identify whether the bearings are refurbished bearings when purchasing bearings.
1. Refurbishment of bearings is generally limited by the technical skills and machinery and equipment of small bearing manufacturers, so the bearing precision is low, the bearing surface is not smooth, the size of the rounded corners is uneven, and some have black skin and black spots.
2. The raw materials used for some fake and inferior bearings are general stainless steel sheets, carbon steel, malleable steel, and galvanized pipes, etc. Most of the materials are white in appearance, and the color of special bearing steel is greenish, but the color is still different. If it is not possible, it is necessary to make a thorough judgment on the strength. Generally, the strength of stainless steel plates is low.
3. Some small manufacturers are technically simple to dip in the fire, and the bearing will be slightly deformed when it is heated unevenly.
4. Rotate the spherical roller bearing to see if the rotation of the bearing is symmetrical and whether the sound is continuous without noise.
5. Looking at the cage, the bearing cage of the reliable manufacturer is neat and free of burrs, and the riveted bearing cage bolts have the same size of the pier head, while the unreliable manufacturer is technically technical in production and processing and simple in machinery and equipment, so the cage is not smooth and has Some riveted structural cages are unevenly divided and aligned, and the bolt pier heads are different in size or riveted.
6. Look at the packaging. Reliable manufacturers have consistent packaging, and the fonts on the packaging are clear. Some counterfeit bearings have inconsistent packaging, or are simply unreliable.
7. Look at the font of the inner hole of the bearing. The original bearing is very clear and well-proportioned regardless of the steel font or the laser font. The laser font has a certain depth. The counterfeit bearing font has broken marks, and the laser font is wiped off with a sand cloth. However, after wiping the font of the reliable laser with a sand cloth, there will be vague font imprints.
8. Look at the certificate. The bearings of reliable manufacturers all have the certificate and the size of the certificate is the same. Most of the certificate printing paper is oil-proof paper. The fonts are clear, and some manufacturers’ certificates have the content of viewing information on them. The certificates are fake, and the fonts are blurred. The printing paper is general printing paper, and the size of the certificate is different. It is recommended to set aside a reliable manufacturer’s certificate for reference.