2022/12/15
National standard of bearing
The standard was formulated early, and the quality grade of bearing was determined by measuring the vibration acceleration value of bearing rotation, which was divided into three quality grades: Z1, Z2 and Z3 from low to high. At present, domestic bearing manufacturers are still using the vibration acceleration value to measure the advantages and disadvantages of bearings, which simply reflects the fatigue life of bearings.
1. National standard for vibration acceleration (commonly known as Z standard)
The standard was formulated early, and the quality grade of bearing was determined by measuring the vibration acceleration value of bearing rotation, which was divided into three quality grades: Z1, Z2 and Z3 from low to high. At present, domestic bearing manufacturers are still using the vibration acceleration value to measure the advantages and disadvantages of bearings, which simply reflects the fatigue life of bearings.
2. Vibration speed standard (commonly known as V standard)
Since the original vibration acceleration standard has not yet been abolished, this standard is based on the standard issued by the Ministry of Machinery Industry, which is formulated by reference to European standards in combination with the actual situation and needs of our country, and divides the quality grade of bearings by detecting the vibration speed of bearings (equivalent to national standards). It is divided into five quality levels: V, V1, V2, V3 and V4. The quality grades of various ball bearings are V, V1, V2, V3 and V4 from low to high; The quality grades of roller bearings (cylindrical and conical) are V, V1, V2 and V3 from low to high.
It reflects the quality of the bearing by detecting the vibration b speed of the bearing in different frequency bands (low frequency, medium frequency, high frequency). We can generally analyze whether the bearing has geometric dimension problems (such as steel ring ellipse), the quality problems of raceway/rolling body, and the quality problems of cage. Compared with the vibration acceleration, the bearing quality has improved significantly. At present, domestic bearings exported to Europe, China's military and aerospace industry all carry out bearing quality inspection in accordance with this standard. At the same time, it provides a feasible means to detect the quality of bearings imported from Europe and identify counterfeit imported bearings. KOYO bearing inspection, imported bearing, skf bearing, nsk bearing, fag bearing, IKO needle roller series bearing.
There are two parallel standards for bearing quality inspection, while bearings with high quality grade of "Z standard" may not have good quality performance when tested with "V standard", and there is no corresponding relationship between the two. This should be paid special attention in the quality inspection of bearings. KOYO bearing inspection, imported bearing, skf bearing, nsk bearing, fag bearing, IKO needle roller series bearing.
Other news
Kejie Bearing now has more than 20 professional bearing production lines, and has advanced automatic production lines, complete testing equipment and experimental equipment to ensure stable quality. In addition to the production of conventional bearings, we can also design and produce various non-standard bearings according to the personalized requirements of customers.
Release time:
2022/11/20
Ningbo Kejie Bearing Co., Ltd. was founded in 2008 and is now located in Wanyang Maker City, Yuyao City, Ningbo, with a plant area of 5000m ²。 Kejie Bearing is committed to developing Φ 3～ Φ The NBKJ-B bearing has the characteristics of low vibration, low noise, low friction, high precision, high sealing, high revolution and long life. The products are widely used in household appliances, small motors, electric tools, computers, power equipment, sports equipment and other transmission devices.
Release time:
2022/11/20
Ningbo Kejie Bearing Co., Ltd. was founded in 2008
Ningbo Kejie Bearing Co., Ltd. was founded in 2008 and is now located in Wanyang Maker City, Yuyao City, Ningbo, with a plant area of 5000m ²。 Kejie Bearing is committed to developing Φ 3～ Φ The NBKJ-B bearing has the characteristics of low vibration, low noise, low friction, high precision, high sealing, high revolution and long life. The products are widely used in household appliances, small motors, electric tools, computers, power equipment, sports equipment and other transmission devices.
Release time:
2022/11/20
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