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Vibration acceleration national standards (
Commonly known as Z standard)
The standards early, in order to measure the vibration of the bearing rotates acceleration value, to determine the quality level of bearing, divided into Z1, Z2, Z3 from low to high quality grade three.
At present domestic bearing manufacturers still use to vibration acceleration value to measure the pros and cons of bearing, simply reflects the fatigue life of bearing.
The vibration velocity standard (
Commonly known as V standard)
Because the original vibration acceleration standard has not been abolished, the standard has emerged as ministerial standard of mechanical industry, is a reference European standard combined with the actual situation in our country and the need to develop, to detect bearing vibration velocity to differentiate bearing the quality levels of (
Equivalent to the national standard)
。
: V, V1, V2, V3 and V4 five levels of quality.
All kinds of ball bearing quality level from low to high V, V1, V2, V3 and V4;
Roller bearing (
Cylinder and cone)
From low to high quality grade V, V1, V2, V3 four quality grades.
It was based on the different frequency (bearing
Low frequency, intermediate frequency and high frequency)
The speed of the vibration of the b to reflect the quality of the bearing.
The analysis of the bearing can be roughly whether geometry problems (
Such as rims ellipse)
, race/the quality problem of the rolling element and cage's quality problem, than to investigate bearing vibration acceleration has improved significantly in quality.
Export to Europe to the current domestic bearing, the military and aerospace industry in China are conducted in accordance with the standard bearing quality inspection, testing at the same time the European import bearing quality and distinguish fake imported bearing provides a feasible method.
KOYO bearings, imported bearings, SKF bearings, NSK bearings, fag bearings, IKO needle roller bearing is bearing series quality testing situation of two parallel standard and quality is high level of the Z standard of the bearing, with the 'V' when testing may not have a good quality performance, there is no corresponding relationship between both.
In the bearing is to pay special attention to the quality inspection.
KOYO bearings, imported bearings, SKF bearings, NSK bearings, fag bearings, IKO needle roller bearing series 2.
To the bearing bearing vibration measuring instrument detection in in running, although ISO2372 standard is excessive vibration velocity to determine, but in the actual to pay special attention to the change of bearing acceleration value, bearing damage process is mostly the fatigue damage in the early period, performance that can generally show the obvious acceleration increases, with the development of fatigue, vibration velocity and displacement increases gradually, heralds bearing in the fatigue damage.
Especially for detecting a bearing, pay careful attention to the vibration value is instability to swing,
Recommend the use of analog pointer instrument, can observe very obvious)
, if there is a swing, indicates the unstable vibration signals, the acceleration is also big, speed increase at the same time, in particular, are likely to 'play' bearing fault.
KOYO bearings, imported bearings, SKF bearings, NSK bearings, fag bearings, IKO needle roller bearing series for new equipment, acceptance testing, while the vibration is very small, in line with the national standard, but in the vibration of the bearing parts appear small oscillation phenomenon, eliminate bearing fit problem (
Play set)
, probably bearing geometry problems, such as bearing rims ellipse, rolling body after a long axis of the ellipse, may be caused by gap decrease instant card roller die, subsequent continued squeezing roller, make the rolling body produces sliding friction, each will appear in the sliding friction roller, cause the unstable signal.
The problems encountered in the detection of shanxi 220 kw new motor, the collapse of the exploration, detect bearing, prove that determine exactly right.
KOYO bearings, imported bearings, SKF bearings, NSK bearings, fag bearings, IKO needle roller bearing series special tips: when check the rolling bearing, must not ignore the change of bearing acceleration value.
Acceleration is more able to early prediction of the rolling bearing fault.
3.
Domestic bearing manufacturers product quality analysis reference,
Through the actual test statistics, on the premise of not fake)
(1) deep groove ball bearings, wafangdian bearing co. , Harbin bearing company, luoyang bearing the company's product quality performance is good.
(2) cylindrical roller bearing, zhejiang tianma bearing the company's quality is better.
Taper roller bearings (3) : after the actual test and visit a national quality inspection center of bearing, the current domestic only zhejiang money-is-coming wanxiang group and fujian over an acceptable quality of the bearing.
(4) angular contact ball bearing: currently, bakelite stents in Harbin bearing an acceptable quality.
Imported bearing quality inspection analysis reference KOYO bearings, imported bearings, SKF bearings, NSK bearings, fag bearings, IKO needle roller bearing series in the imported bearing quality inspection, Japan's model the real bearing quality is good.
But now find a famous bearing quality is not ideal, the reason is that the basic not bearing the company domestic local production.
In nominal origin for the brand bearing detection in Malaysia and Australia found that its quality is not very ideal, even than the real bearing of domestic normal manufacturer.
KOYO bearings, imported bearings, SKF bearings, NSK bearings, fag bearings, IKO needle roller bearing series tip: now for various forms of double row roller bearing and pure axial thrust bearing state, there is no corresponding testing standards.
For angular contact ball bearing, after meet the provisions of the axial load can be reference to the quality levels of deep groove ball bearings.
