Identify the bearing
To identify the quality of equipment bearings, we usually proceed from the following aspects:
Whether the outer package is clear Double-row tapered roller bearings Under normal circumstances, the regular manufacturers of the brand have their own specialized designers to design the external packaging, and arrange the production conditions of the factory pass the production, therefore, the product packaging from the line The color blocks should be very clear and unambiguous.
Whether the stencil printing is clear
Each bearing product will have its brand name, label, etc. printed on the body of the bearing product. Although the fonts are very small, the products made by regular manufacturers all use the stencil printing technique and they are pressed before the heat treatment. Therefore, although the font is small, it is very concave and very clear. Under normal circumstances, 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 can easily be wiped off by hand or severely traced by hand.
Is there any noise
The left hand holds the bearing body sleeve, and the right hand reciprocates the jacket by a small amount to rotate it, and hears whether there is any noise in the bearing during operation. Since most of the counterfeit products have backward production conditions and are completely hand-operated, the bearing body will inevitably contain impurities such as dust and sand during the production process. Therefore, when the bearing rotates, there will be a phenomenon of noise or non-smooth operation. . This point is the key to judging whether the product comes from the strict production standards and the regular manufacturer’s brand products that are operated by machines.
Does the surface have cloudy oil traces?
Whether the surface has cloudy oil traces requires us to pay special attention when purchasing imported bearings. Because domestic rust prevention technology has a certain gap with foreign advanced manufacturing countries, it is easy to leave a thick oil trace on the rust prevention treatment of the bearing body, and it feels sticky and thick when touched by hand. Impervious oil marks are barely visible on imported bearings. According to industry insiders, people with special care can smell a special smell on imported bearings, which is the taste of anti-rust oil.
Whether the chamfer is even
The so-called chamfering of the bearing, that is, the intersection of the lateral surface and the vertical surface, counterfeit bearing products due to the limitations of production technology, in these corners of the corner of the treatment is not satisfactory, we can easily distinguish this point.
After the packaging has been manufactured and tested, the bearings are cleaned and rust-proof, and then put into the inner packaging to achieve waterproof, moisture, dust, impact, and bearing quality and precision. And for the convenience of use and sales purposes.
Bearing inner packaging is divided into three types according to the rust prevention period:
1 Short rust-proof packaging: rust-proof period of 3 to 6 months, suitable for large-scale delivery to the same subscriber, the bearings will be put into use in a short time. With the agreement of both parties, simple packaging is adopted for the principle of convenience.
2 general rust-proof packaging: rust-proof period of one year, suitable for general-purpose bearings.
3 long rust-proof packaging: rust-proof period of two years, suitable for special and precision bearings.
The inner packaging material of the bearing is polyethylene plastic box (carton), kraft paper, plain and wrinkle polyethylene composite paper, carton, polyethylene or polyethylene plastic film, nylon fastening tape or plastic braided fastening tape, waterproof high-strength plastic tape. , linen bags and so on. The above materials are required to ensure that the material is tested for corrosion resistance.