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Oscillation inspection specification for rolling bearings
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The specification is drafted earlier; to measure the value of the oscillation acceleration when the bearing rotates; to determine the quality grade of the bearing; divided into three quality grades from Z1, Z2, Z3 from low to high. The current domestic bearing manufacturers are still using; The value is a measure of the quality of the bearing; it simply reflects the fatigue life of the INA bearing.
2. Oscillation speed specification (commonly known as V standard)
Because the original oscillatory acceleration specification has not been abandoned; therefore, the specification is presented in the specifications of the Ministry of Machinery Industry; it is based on the European norms in connection with China's practice and needs; to determine the bearing's oscillation speed to distinguish the quality level of the bearing (equivalent to the country) Specification). It is divided into five quality grades of V, V1, V2, V3 and V4. The quality grades of various ball bearings are from V to V1, V1, V3, V4, and the quality of roller bearings (cylinder, cone). Low to high are four quality grades of V, V1, V2 and V3. It reflects the quality of the bearing by detecting the oscillation speed of different frequency segments (low frequency, medium frequency, high frequency) of the bearing. Can the bearing be roughly divided? There are several scale problems (such as steel ring ellipse), the quality problem of the raceway/roller body, the quality problem of the cage, and the bearing quality has been significantly improved compared with the oscillation acceleration. The current domestic exports to Europe, the Chinese military And the aerospace industry in accordance with the specification of bearing quality testing; together with the detection of European INA imported bearing quality and clarification impersonation of imported bearings supply a feasible approach.
There are two parallel specifications in the current bearing quality inspection; the "Z standard" bearing with high quality grade; the "V standard" test may not have good quality; there is no corresponding relationship between the two. This is in the bearing In the quality inspection, it is necessary to pay special attention.
two. The INA measuring bearing is used to detect the bearing in the bearing. The ISO2372 specification discriminates whether the oscillation can be over-expanded by the oscillation speed. However, in the field practice, the bearing acceleration value should be uniquely emphasized. The damage process of the bearing is mostly the initial stage. It is manifested as fatigue damage; this can usually be reflected as a significant increase in acceleration; followed by exhaustion; gradually showing an increase in oscillation speed and displacement; indicating that the bearing is fatigued. Unique when testing bearings; be careful Pay attention to whether the oscillation value can be unstablely oscillated (proposed to use the analog pointer instrument; it can be investigated very significantly); if it is swaying; it indicates that the unstable oscillating signal is present; the acceleration is also large; the unique is the speed together Increase; there is a strong problem with the bearing "clip".
About the new equipment; when testing and testing; although the oscillation is very good, the smashing of the smashing of the shackles, the sorrows of the sorrows, the sorrows, the sorrows, the sorrows, the sorrows, the slogans (playing sets); There are problems in the scale; for example, the bearing steel ring ellipse; when the rolling body passes the elliptical long axis orientation; it can be stuck when the roll body is formed due to the reduction of the gap; the subsequent rolling body continues to knead; the rolling body is subjected to sliding friction; each rolling body will Here, the sliding friction is presented; the unstable signal is formed. This problem is encountered in the detection of the new 220KW motor in Shanxi; the crash detection; the detection of the bearing; the proof is completely correct.
Unique hint: When looking at the rolling bearing; must not neglect the change of the bearing acceleration value. The acceleration can predict the fault of the rolling bearing in the early stage.
three. Analysis of domestic bearing quality inspection refers to 1. Anatomy of the quality of domestic bearing manufacturers (by practice testing; on the premise of ensuring authenticity)
1 deep groove ball bearing: Wafangdian Bearing Company, Harbin Bearing Company, Luoyang Bearing Company's production quality is still good.
2 cylindrical roller bearing: Zhejiang Tianma Bearing Company's quality is better.
3 Conical roller bearing: Through the practice test and visit the national bearing quality inspection middle; at present, as long as Zhejiang Qianchao Wanxiang Group and Fujian Yuzhao Group's INA bearing quality is acceptable.
4-angle touch ball bearing: The bearing quality of the current bakelite bracket in Harbin is acceptable.
four. The quality inspection of imported bearings is referred to in the quality inspection of imported bearings; the quality of various types of genuine bearings in Japan is still good, but the quality of a famous bearing is not found at present; the reason is that the domestic bearing is not the company's hometown. The place of origin is found in the bearing inspection of the trademarks in Malaysia and Australia; its quality is not aspiring; it is not as good as the genuine bearings of domestic manufacturers.
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