Inspectia calitatii
Standard national
1. Standard național de accelerare a vibrațiilor (cunoscut în mod obișnuit ca standard Z)
Acest standard a fost formulat relativ devreme pentru a determina nivelul de calitate al rulmentului prin măsurarea valorii de accelerație a vibrațiilor atunci când rulmentul se rotește și este împărțit în trei niveluri de calitate de la scăzut la ridicat, Z1, Z2 și Z3. În prezent, producătorii autohtoni de rulmenți încă folosesc valoarea accelerației vibrațiilor pentru a măsura calitatea rulmentului, care reflectă pur și simplu durata de viață la oboseală a rulmentului.
2. Viteza de vibrație standard (cunoscută în mod obișnuit ca marca 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
