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Five standard methods for distinguishing true and false bearings

wallpapers News 2020-05-23
Whether the steel printing is clear
Each bearing product will have its brand name, label, etc. printed on the bearing product body. Although the font is tiny, the products produced by regular manufacturers are printed with steel stamping technology, and they are pressed before being heat-treated. Therefore, although the font is small, it is profound and palpable. In general, the fonts of counterfeit products are not only fuzzy, but because of the rough printing technology, the fonts float on the surface, and some can even be easily erased by hand or have serious hand marks.
Is there any noise
Hold the bearing inner sleeve with your left hand and rotate the outer cover slightly with your right hand to make it turn. Listen to the noise during the operation of the bearing. Due to the backward production conditions of most counterfeit products and completely manual workshop operation, impurities such as dust and sand will inevitably be mixed into the bearing body during the production process, so there will be noise or unsmooth maintenance when the bearing rotates. This is the key to judging whether the product comes from a brand product of a regular manufacturer that has strict production standards and is operated by a machine.
Whether there is muddy oil on the surface
Whether there are muddy oil marks on the surface requires us to pay special attention when purchasing imported bearings. Because there is still a particular gap between the domestic anti-rust technology and the foreign advanced manufacturing countries, it is easy to leave thick oil marks when the anti-rust treatment is performed on the bearing body. It feels sticky and dull when it is touched by hand and the foreign original. There are almost no traces of anti-rust oil on the imported bearings. According to industry insiders, careful people can smell a distinctive smell on imported bearings, which is the smell of anti-rust oil.
Whether the chamfer is uniform
The so-called chamfer of the bearing is the junction of the horizontal and vertical surfaces. Due to the production technology limitations, counterfeit bearing products are not handled satisfactorily at these corners and corners. This can be easily identified.
Bearing packaging
The packaging is divided into inner packaging and outer packaging. After manufacturing and passing the inspection, the bearing is cleaned and rust-proofed, and then placed in the internal packaging to achieve waterproof, moisture-proof, dust-proof, impact-proof, and maintain the quality and accuracy of the bearing And the purpose of convenient use and sale.
Bearing inner packaging is divided into three categories according to the rust prevention period:
①Short anti-rust packaging: an anti-rust period of 3 to 6 months, suitable for bearings shipped to the same subscriber in large quantities and put into use quickly. After the agreement between the two parties, the principle of convenience is to use simple packaging.
②General anti-rust packaging: an anti-rust period of one year, suitable for general-purpose bearings.
③ Long anti-rust packaging: an anti-rust period of two years, ideal for single and precision bearings.
Bearing inner packaging materials include polyethylene plastic tube (box), kraft paper, dull and wrinkled polyethylene composite paper, paper box, polyethylene or polyethylene plastic film, nylon fastening tape or plastic weaving fastening tape, waterproof high-strength plastic tape, Burlap bags, etc. The above materials are required to ensure that the corrosion resistance test of the materials is qualified.
Five standard methods for distinguishing true and false bearings