Distinguish true and false of self-aligning ball bearings

*Is the stencil clear

Each bearing product will have its brand words, labels, etc. printed on the bearing product body. Although the font is very small, the products produced by regular manufacturers are printed with steel stamping technology, and they are embossed before heat treatment. Therefore, although the font is small, it is deeply concave and very clear. Under normal circumstances, the fonts of counterfeit products are not only vague, 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 inner sleeve of the bearing body with the left hand, and turn the outer sleeve back and forth with the right hand slightly to make it rotate, and listen to whether there is any noise during the operation of the bearing. Due to the backward production conditions of most counterfeit products and the 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 operation when the bearing rotates. . This is the key to judging whether the product comes from a branded product of a regular manufacturer that has strict production standards and is operated by machines.

*Whether there is cloudy oil on the surface

Whether there are turbid oil traces on the surface, we should pay special attention when purchasing imported bearings. Since there is still a certain gap between the domestic anti-rust technology and foreign advanced manufacturing countries, it is easy to leave thick oil traces when the bearing body is anti-rust treatment, and it feels sticky and sticky when touched by hand, and the original foreign There is hardly any trace of anti-rust oil on imported bearings. According to industry insiders, people who are particularly attentive can smell a special 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 limitation of production technology, the counterfeit bearing products are not well handled in these corners and corners, which we can easily identify.

*Bearing packaging

Packaging is divided into inner packaging and outer packaging. After the bearings are manufactured and passed the inspection, they are cleaned and rust-proofed, and then put into the inner packaging to achieve waterproof, moisture-proof, dust-proof, impact-proof, and maintain the quality and accuracy of the bearing. and the purpose of convenience of use and sale.

The inner packaging of the bearing is divided into three categories according to the anti-rust period:

① Short rust-proof period packaging: The rust-proof period is 3 to 6 months, which is suitable for bearings that are shipped to the same subscriber in large quantities and put into use in a short period of time. By agreement between the two parties, based on the principle of convenient use, simple packaging is adopted.

② General anti-rust period packaging: anti-rust period of one year, suitable for general-purpose bearings.

③ Long anti-rust period packaging: anti-rust period of two years, suitable for special and precision bearings.

The inner packing materials of the bearing are polyethylene plastic cylinder (box), kraft paper, plain and corrugated polyethylene composite paper, carton, polyethylene or polyethylene plastic film, nylon fastening tape or plastic braided fastening tape, waterproof high-strength plastic tape , burlap bags, etc. All the above materials need to ensure that the corrosion resistance test of the material is qualified.