How to distinguish between good and bad bearings?

How to distinguish between good and bad bearings?

There are many ways to judge the quality of bearings, and the following are some common methods:

1. Observing the appearance of bearings: Regular brand bearing products have very clear appearance lines and color blocks. For example, bearings from brands such 

as SKF have higher clarity in color and font.

2. Check for any noise in the bearings: If the bearings are manufactured under harsh conditions, they may be mixed with impurities such as debris. When manually 

moving the bearings, there may be noise.

3. Check the steel seal of the bearing: The bearing body will be printed with brand words, markings, and other symbols. These steel stamping techniques usually start 

pressing characters before being overheated, resulting in deep and very clear dents.

4. Check the oil stains on the surface of the bearings: Regular manufacturers will add rust proof oil when carrying out rust prevention treatment. But these oil stains 

usually have no obvious traces, except for a certain odor.

5. Check the chamfer of the bearing: The chamfer of the bearing is at the intersection of the horizontal and vertical surfaces. Due to limitations in manufacturing 

technology, the handling of counterfeit bearings on these details is often inadequate.

6. Traditional method: rough judgment of the working condition of internal bearings in mechanical equipment is made by experienced workers using their hands 

to touch and ears to listen. However, in today's rapidly developing industrial manufacturing industry, this method has many drawbacks, and at the same time, the 

use of manual labor cannot timely and effectively eliminate faults.

7. Temperature testing method: Use temperature sensitive equipment to correctly determine the lifespan of bearings. This method is quite sensitive to changes 

in bearing load, speed, and lubrication.

8. Acoustic emission testing method: Determine the condition of the finished product by collecting acoustic emission signals. This method has many advantages, 

such as short response time of acoustic emission signals, quick reflection of faults, real-time display and location of fault points, and so on.

9. Pressure wave testing method: By receiving fluctuation signals, analyze and determine whether the bearing has faults.

10. Vibration diagnosis technology: Determine bearing faults by receiving and analyzing periodic pulse signals. This method is very convenient for inspecting 

equipment installation and is also one of the commonly used methods for inspecting finished bearings.