Ispezione di qualità
Norma nazionale
1. Standard nazionale di accelerazione delle vibrazioni (comunemente noto come standard Z)
Questo standard è stato formulato relativamente presto per determinare il livello di qualità del cuscinetto misurando il valore di accelerazione della vibrazione quando il cuscinetto è in rotazione ed è suddiviso in tre livelli di qualità da basso ad alto, Z1, Z2 e Z3. Al momento, i produttori di cuscinetti nazionali stanno ancora utilizzando il valore di accelerazione delle vibrazioni per misurare la qualità del cuscinetto, che riflette semplicemente la durata a fatica del cuscinetto.
2. Standard di velocità di vibrazione (comunemente noto come segno V)
Since the original vibration acceleration standard has not been abolished, the standard was issued as a standard issued by the Ministry of Machinery Industry. It was formulated with reference to European standards and combined with my country's actual conditions and needs. It is used to detect the vibration speed of the bearing to classify the quality level of the bearing (equivalent to the national standard). Divided into five quality levels: V, V1, V2, V3, and V4. The quality grades of various ball bearings from low to high are V, V1, V2, V3, V4; the quality grades of roller bearings (cylindrical and cone) from low to high are V, V1, V2, and V3.
It reflects the quality of the bearing by detecting the vibration b speed of the bearing in different frequency ranges (low frequency, medium frequency, high frequency). It can be roughly analyzed whether the bearing has geometric size problems (such as steel ring ellipse), the quality of the raceway/rolling element, and the quality of the cage. Compared with the vibration acceleration, the quality of the bearing has been significantly improved. At present, domestic bearings exported to Europe, my country's military and aerospace industry have carried out bearing quality testing in accordance with this standard. At the same time, testing the quality of European imported bearings and distinguishing counterfeit imported bearings provides a feasible means.
Bearing quality testing has two parallel standards. Bearings with a high "Z-mark" quality level may not have good quality performance when tested with "V-mark", and there is no corresponding relationship between the two. This should be paid special attention to in the quality inspection of the bearing
