CN103674546A - Accelerated fatigue life test method for wind power slewing bearing - Google Patents
Accelerated fatigue life test method for wind power slewing bearing Download PDFInfo
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- CN103674546A CN103674546A CN201210328382.1A CN201210328382A CN103674546A CN 103674546 A CN103674546 A CN 103674546A CN 201210328382 A CN201210328382 A CN 201210328382A CN 103674546 A CN103674546 A CN 103674546A
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Abstract
The invention discloses an accelerated fatigue life test method for a wind power slewing bearing. The accelerated fatigue life test method comprises the following steps: step 1, mounting the slewing bearing on a slewing bearing test bed; step 2, applying a peak load to the slewing bearing, and rotating the slewing bearing at a test rotating speed; step 3, when a test time is up, stopping the slewing bearing; step 4, judging whether a valley value test is needed, ending the test if the valley value test is not needed, or executing step 5 if the valley value test is needed; step 5, applying a load at the valley value to the slewing bearing, and rotating the slewing bearing at the test rotating speed; step 6, when the test time is up, stopping the slewing bearing; step 7, checking whether the product is qualified or not. Through the adoption of the accelerated fatigue life test method, the fatigue bearing capacity of the track of the wind power slewing bearing can be tested accurately and quickly.
Description
Technical field
The present invention relates to a kind of wind-powered turntable bearing life test method that accelerates fatigue.
Background technology
Turntable bearing is a kind ofly can bear the combined loads such as larger axial load, radial load and upsetting moment simultaneously, integrates the large size bearing of the special construction of supporting, rotation, transmission, the several functions such as fixing.Turntable bearing itself has the features such as compact conformation, guiding rotation convenience, simple installation and maintenance are easy, is widely used on the huge revolving devices such as blower fan, handling machinery, digger, constructional engineering machinery, harbour machinery, wind-power electricity generation, Medical Devices, radar and missile launcher.
Turntable bearing has various of failure, but be mostly raceway fatigue failure, be embodied in raceway spot corrosion, peel off etc., due to the greatest differences of turntable bearing at the each side such as structure, technique, operating mode and plain bearing, plain bearing rolling contact fatigue life designs a model, parameter etc. can not directly be applied mechanically when the design of turntable bearing raceway and check, and it is reasonable, believable by the method for test, checking turntable bearing raceway fatigue capacity in this case.
Aspect wind-powered electricity generation, according to the actual condition of wind-powered turntable bearing or customer requirement, load and set experimental period, because different fan conditions are different, different clients' specific requirement is also not quite similar, so up to the present also there is no unified experimental technique.
Wind-powered turntable bearing requires 20 years of operation under fatigue load conventionally, shop experiment can not be by equal operating mode 20 years of operation, how under the prerequisite that does not change failure mechanism, accelerating checking wind-powered turntable bearing raceway fatigue capacity and whether reach requirement, is the common difficulty of wind-powered turntable bearing manufacturing firm and complete blower producer.
Summary of the invention
The technical problem to be solved in the present invention is can not quick and precisely check the defect of wind-powered turntable bearing raceway fatigue capacity in order to overcome prior art, and a kind of wind-powered turntable bearing life test method that accelerates fatigue is provided.
The present invention solves above-mentioned technical matters by following technical proposals:
The wind-powered turntable bearing life test method that accelerates fatigue, described method has been utilized a turntable bearing testing table, and its feature is, and it comprises the following steps:
Step 1, a turntable bearing is assembled on described turntable bearing testing table;
Step 2, described turntable bearing is applied to a peak load, and rotate with a test speed;
Step 3, reach after a test period, stop operating;
If the valley load that the described peak load of step 4 is corresponding is less than described peak load, or the loading direction of described peak load and described valley load is contrary, directly enters step 7, otherwise enters step 5;
Step 5, described turntable bearing is applied to described valley load, and rotate with described test speed;
Step 6, reach after described test period, stop operating;
Step 7, check the raceway of described turntable bearing, if described raceway peels off in the position except soft band, described turntable bearing is defective, otherwise product is qualified, off-test.
Preferably, described test period determined by formula T=2N/Z/n/60, and wherein T is described test period, and unit is hour, and Z is the single ball number of described turntable bearing, and N is load cycle number of times, and n is described test speed, and unit is rev/min.
Preferably, described load cycle number of times is determined according to bearing fatigue loading spectrum, if loading spectrum is not specified load cycle number of times, uses 10
7inferior.
Preferably, described test speed is no more than the maximum (top) speed of real work.
Positive progressive effect of the present invention is: by utilization of the present invention, can be accurate, and check fast wind-powered turntable bearing raceway fatigue capacity.
Accompanying drawing explanation
Fig. 1 is that rolling contact fatigue substitutes the tired schematic diagram of contact alternation.
Fig. 2 is turntable bearing fatigue load spectrum.
Fig. 3 is that turntable bearing bears fatigue load schematic diagram.
Fig. 4 is preferred embodiment schematic flow sheet of the present invention.
Embodiment
Enumerate preferred embodiment below, and carry out by reference to the accompanying drawings the clearer the present invention that intactly illustrates.
Before experiment, be first ready to load axial force (Fa), radial force (Fr), upsetting moment (M) combined load and to drive the experiment table of turntable bearing a set of turntable bearing to be tested; The turntable bearing fatigue load spectrum being provided according to IEC61400 or Lloyd standard by complete machine producer, loading spectrum is conventionally as shown in table 1,2, by equivalent cycle N time.Data in table 1,2 are only illustrated example use, do not represent the actual fatigue load spectrum of turntable bearing.
Table 1 turntable bearing fatigue load average
Table 2 turntable bearing fatigue load changes amplitude
While generally believing now turntable bearing design, check, analysis, should choose the capable corresponding load data of m=3, and in fact S-N curve refers to stress in table 1,2---fatigue lifetime relation, theoretical according to Hertz, between contact load and contact stress, there are 3 power relations, so should choose the corresponding load data of m=9 during the analysis of fatigue of turntable bearing raceway.
Choose the load change amplitude of m=9 shelves, calculate respectively peak load and the valley load of each sharing part of the load, as shown in Figure 2, peak load is that load average adds half load change amplitude, and valley load is that load average subtracts half load change amplitude; According to the vector correlation of each sharing part of the load, calculate respectively peak value and the valley of turntable bearing test axial force, radial force, upsetting moment.
From Fig. 1-3, can find out, turntable bearing ball to raceway be equivalent to respectively peak value with under valley load, contact respectively circulation N time.
Therefore can replace the alternation contact fatigue that in blower fan practical work process, load change causes with the rolling contact fatigue that rolling body rolling causes, by formula T=2N/Z/n/60, calculate test period, wherein turntable bearing test speed n is no more than the maximum load of turntable bearing real work.
In formula: T---test period (hour);
Z---the single ball number of turntable bearing;
N---test speed (r/min);
N---load cycle number of times.
The numerical value of N is definite according to bearing fatigue loading spectrum, if loading spectrum is not specified load cycle number of times, and recommendation 10
7inferior.
As shown in Figure 4, the step of test comprises:
Step 1, a turntable bearing is assembled on described turntable bearing testing table;
Step 2, described turntable bearing is applied to a peak load, and rotate with test speed n;
Step 3, reach after test period T, stop operating;
If the valley load that the described peak load of step 4 is corresponding is less than described peak load, or the loading direction of described peak load and described valley load is contrary, directly enters step 7, otherwise enters step 5;
Step 5, described turntable bearing is applied to described valley load, and rotate with described test speed;
Step 6, reach after described test period, stop operating;
Step 7, check the raceway of described turntable bearing, if described raceway peels off in the position except soft band, described turntable bearing is defective, otherwise product is qualified, off-test.
Although more than described the specific embodiment of the present invention, it will be understood by those of skill in the art that these only illustrate, protection scope of the present invention is limited by appended claims.Those skilled in the art is not deviating under the prerequisite of principle of the present invention and essence, can make various changes or modifications to these embodiments, but these changes and modification all fall into protection scope of the present invention.
Claims (4)
1. the wind-powered turntable bearing life test method that accelerates fatigue, described method has been utilized a turntable bearing testing table, it is characterized in that, and it comprises the following steps:
Step 1, a turntable bearing is assembled on described turntable bearing testing table;
Step 2, described turntable bearing is applied to a peak load, and rotate with a test speed;
Step 3, reach after a test period, stop operating;
If the valley load that the described peak load of step 4 is corresponding is less than described peak load, or the loading direction of described peak load and described valley load is contrary, directly enters step 7, otherwise enters step 5;
Step 5, described turntable bearing is applied to described valley load, and rotate with described test speed;
Step 6, reach after described test period, stop operating;
Step 7, check the raceway of described turntable bearing, if described raceway peels off in the position except soft band, described turntable bearing is defective, otherwise product is qualified, off-test.
2. the wind-powered turntable bearing as claimed in claim 1 life test method that accelerates fatigue, it is characterized in that, described test period is determined by formula T=2N/Z/n/60, wherein T is described test period, unit is hour, and Z is the single ball number of described turntable bearing, and N is load cycle number of times, n is described test speed, and unit is rev/min.
3. the wind-powered turntable bearing as claimed in claim 2 life test method that accelerates fatigue, is characterized in that, described load cycle number of times is determined according to bearing fatigue loading spectrum, if loading spectrum is not specified load cycle number of times, uses 10
7inferior.
4. the life test method that accelerates fatigue of the wind-powered turntable bearing as described in claim 1-3 any one, is characterized in that, described test speed is no more than the maximum (top) speed of real work.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210328382.1A CN103674546B (en) | 2012-09-06 | 2012-09-06 | Wind-powered turntable bearing accelerates fatigue life test method |
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| CN201210328382.1A CN103674546B (en) | 2012-09-06 | 2012-09-06 | Wind-powered turntable bearing accelerates fatigue life test method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106248379A (en) * | 2016-08-19 | 2016-12-21 | 北京航空航天大学 | A kind of bearing with solid lubricant accelerated life test loading spectrum method for designing |
| DE102018104900A1 (en) * | 2018-03-05 | 2019-09-05 | Schaeffler Technologies AG & Co. KG | Test bench and method for testing a bearing arrangement |
| CN111947950A (en) * | 2020-07-01 | 2020-11-17 | 北京工业大学 | Multi-dimensional comprehensive stress life test load spectrum design method based on load information matrix |
| CN112557037A (en) * | 2020-11-30 | 2021-03-26 | 南京工业大学 | Accelerated life test method for wind power main shaft bearing model |
| CN114509262A (en) * | 2022-01-25 | 2022-05-17 | 中国铁建重工集团股份有限公司 | Acceleration test method for main bearing of heading machine |
| CN114509260A (en) * | 2021-11-29 | 2022-05-17 | 中国航发沈阳发动机研究所 | Acceleration equivalent test method for high-speed inner and outer ring co-rotating roller bearing of aircraft engine |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101419125A (en) * | 2008-12-08 | 2009-04-29 | 南京工业大学 | Wind power turntable bearing comprehensive performance experiment table |
| CN102393300A (en) * | 2011-11-29 | 2012-03-28 | 南京工大数控科技有限公司 | Rolling contact fatigue test method of small sample turnplate bearing |
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2012
- 2012-09-06 CN CN201210328382.1A patent/CN103674546B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101419125A (en) * | 2008-12-08 | 2009-04-29 | 南京工业大学 | Wind power turntable bearing comprehensive performance experiment table |
| CN102393300A (en) * | 2011-11-29 | 2012-03-28 | 南京工大数控科技有限公司 | Rolling contact fatigue test method of small sample turnplate bearing |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106248379A (en) * | 2016-08-19 | 2016-12-21 | 北京航空航天大学 | A kind of bearing with solid lubricant accelerated life test loading spectrum method for designing |
| CN106248379B (en) * | 2016-08-19 | 2018-08-21 | 北京航空航天大学 | A kind of bearing with solid lubricant accelerated life test loading spectrum design method |
| DE102018104900A1 (en) * | 2018-03-05 | 2019-09-05 | Schaeffler Technologies AG & Co. KG | Test bench and method for testing a bearing arrangement |
| CN111947950A (en) * | 2020-07-01 | 2020-11-17 | 北京工业大学 | Multi-dimensional comprehensive stress life test load spectrum design method based on load information matrix |
| CN111947950B (en) * | 2020-07-01 | 2022-03-08 | 北京工业大学 | Multi-dimensional comprehensive stress life test load spectrum design method based on load information matrix |
| CN112557037A (en) * | 2020-11-30 | 2021-03-26 | 南京工业大学 | Accelerated life test method for wind power main shaft bearing model |
| CN112557037B (en) * | 2020-11-30 | 2022-03-11 | 南京工业大学 | Accelerated life test method for wind power main shaft bearing model |
| CN114509260A (en) * | 2021-11-29 | 2022-05-17 | 中国航发沈阳发动机研究所 | Acceleration equivalent test method for high-speed inner and outer ring co-rotating roller bearing of aircraft engine |
| CN114509260B (en) * | 2021-11-29 | 2023-12-15 | 中国航发沈阳发动机研究所 | Acceleration equivalent test method for high-speed inner-outer ring co-rotating roller bearing of aero-engine |
| CN114509262A (en) * | 2022-01-25 | 2022-05-17 | 中国铁建重工集团股份有限公司 | Acceleration test method for main bearing of heading machine |
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| CN103674546B (en) | 2016-04-13 |
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