1. What is a bearing?
Bearing is an important component in contemporary mechanical equipment. Its main function is to support the mechanical rotating body, reduce the friction coefficient during its movement, and ensure its rotational accuracy.
According to the different frictional properties of moving components, bearings can be divided into two categories: rolling bearings and sliding bearings. Rolling bearings have been standardized and serialized, but compared to sliding bearings, they have larger radial dimensions, vibration, and noise, and are also more expensive.
Rolling bearings are generally composed of four parts: outer ring, inner ring, rolling element, and cage. According to the shape of rolling elements, rolling bearings are divided into two categories: ball bearings and roller bearings.
The bearings of the cooling fan are divided into ball bearings and oil bearings. Among them, ball bearings have better quality and longer service life compared to oil bearings, and of course, their prices are also higher. Bearings are important basic components of various mechanical equipment, and their accuracy, performance, lifespan, and reliability play a decisive role in the accuracy, performance, lifespan, and reliability of the host machine.
2. How to distinguish the quality of equipment bearings? We can start from the following aspects:
Is the outer packaging clear
In general, brands produced by legitimate manufacturers of double row tapered roller bearings have their own specialized design personnel for external packaging design, and arrange factories with qualified production conditions for production. Therefore, the packaging of products should be very clear and unambiguous from lines to color blocks.
Is the steel seal clear
Each bearing product will have its brand name, label, etc. printed on its body. Although the font is very small, products produced by legitimate manufacturers use steel stamping technology for printing, and they are pressed before being overheated. Therefore, although the font is small, it is deeply concave and very clear. In general, the font of counterfeit products is not only blurry, but due to the rough printing technology, the font floats on the surface, and some can even be easily erased by hand or have severe hand marks.
Is there any noise
Hold the inner sleeve of the bearing with your left hand, and gently rotate the outer sleeve with your right hand to listen for any noise during the bearing operation. Due to the outdated production conditions of most counterfeit products and the complete manual workshop operation, impurities such as dust and sand may inevitably be mixed into the bearing body during the production process. Therefore, there may be noise or unsmooth operation when the bearing rotates. This is the key to determining whether the product comes from a reputable manufacturer's branded product with strict production standards and machine operation.
Is there any turbid oil stains on the surface
We should pay special attention to whether there are turbid oil stains on the surface when purchasing imported bearings. Due to a certain gap between domestic rust prevention technology and advanced manufacturing countries abroad, it is easy to leave thick oil stains when rust prevention treatment is carried out on the bearing body. When touched by hand, it feels sticky and viscous, and almost no traces of rust prevention oil can be seen on imported bearings. According to industry insiders, those who are particularly careful can smell a special smell on imported bearings, which is the smell of anti rust oil.
Is the chamfer even
The so-called chamfer of bearings refers to the intersection between the horizontal and vertical surfaces. Due to production technology limitations, counterfeit bearing products are not handled satisfactorily at these edges and corners, which we can easily distinguish.
Bearing packaging
The packaging is divided into inner packaging and outer packaging. After the bearings are manufactured and inspected to be qualified, they are cleaned and rust treated, and then placed in the inner packaging to achieve waterproof, moisture-proof, dustproof, impact resistant, maintain the quality and accuracy of the bearings, and facilitate use and sales.
The inner packaging of bearings is divided into three categories according to the rust prevention period:
① Short rust prevention packaging: The rust prevention period is 3-6 months, suitable for bearings that are shipped in large quantities to the same customer and can be put into use in a short period of time. By mutual agreement, simple packaging is adopted for convenience of use.
② General rust prevention packaging: The rust prevention period is one year, suitable for general purpose bearings.
③ Long rust proof packaging: with a rust proof period of two years, suitable for special and precision bearings.
The inner packaging materials for bearings include polyethylene plastic cylinders (boxes), kraft paper, plain and wrinkled polyethylene composite paper, paper boxes, polyethylene or polyethylene plastic films, nylon or plastic woven fastening belts, waterproof high-strength plastic belts, linen bags, etc. The above materials must ensure that their corrosion resistance test is qualified.