CN106248379A - A kind of bearing with solid lubricant accelerated life test loading spectrum method for designing - Google Patents
A kind of bearing with solid lubricant accelerated life test loading spectrum method for designing Download PDFInfo
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Abstract
The present invention relates to a kind of bearing with solid lubricant accelerated life test loading spectrum method for designing, it is characterised in that comprise the following steps: 1) obtain the operation on orbit section of bearing with solid lubricant;2) the loading spectrum block obtained is converted into loads typical spectrum block;3) according to failure mechanism and the Dynamic wear rule of bearing with solid lubricant, loading spectrum block is carried out staged care.On the premise of not changing bearing with solid lubricant failure mechanism, it is achieved the accelerated life test of bearing with solid lubricant has the purpose of preferable acceleration effect.
Description
Technical field
The invention belongs to space flight spaceborne drive mechanism critical component reliability field, be specifically related to a kind of acquisition solid lubrication
The method of bearing accelerated life test loading spectrum.
Background technology
Show according to external satellite statistics: " stuck " that spaceborne drive mechanism causes because of insufficient lubrication is to cause to defend
The one of the main reasons that star lost efficacy, and the fretting wear of spaceborne drive mechanism is the major reason causing its hydraulic performance decline.Gu
Body lubrication bearing is the critical component of spaceborne drive mechanism, and performance degradation and precision forfeiture that its long time running causes are impacts
The key factor in satellite life-span in-orbit, thus its high reliability and long-life to the development of China's spacecraft and use to closing weight
Want.Generally the life characteristics of product is to be obtained by the method doing life test under normal operation.But solid is moistened
For plain besring, its design is accurate, weaving process is complicated, production cost is high, specificity is strong, typically will not carry out large batch of life
Producing, the situation carrying out its Life cycle life test and relevant destructive life test is the most less.And along with design, manufacture
The development of technology, and the use of new material, the life-span of space flight bearing with solid lubricant is more and more longer, so that life test
Need to expend the longest test period and substantial amounts of testing expenses, it could even be possible to cause required test period to be far longer than
Lead time, it is difficult to complete life appraisal and checking before being taken into use, thus the accelerated life test to bearing with solid lubricant
Gradually it is subject to people's attention.
At present, at industrial quarters, electronic product stress accelerated life test method comparative maturity, perfect test is had to advise
Model and statistical method can be followed, but the test sample amount needed is big, and test period is long.Engineering goods are because failure mechanism compares electricity
Sub-product is increasingly complex, the most not yet forms standardized accelerated life test specification.Bearing with solid lubricant is as a kind of accurate
Mechanical part, when its distinctive lubricating system, work, residing spatial environments and cyclic stress section determine its fault
The characteristic that pattern is various, stress coupling is serious, causes traditional stress accelerated life test loading spectrum and existing acceleration
Model is difficult to provide life appraisal result accurately.Therefore, the most deeply disclose the failure mechanism of bearing with solid lubricant, refinement adds
Speed stress, how based on the distinctive failure mechanism of bearing with solid lubricant and working stress Section Design accelerated life test loading spectrum
It is to break through the theoretical key with statistical method of bearing with solid lubricant accelerated life test.
Accelerated life test is on the premise of not changing product failure mechanism, by strengthening the way of stress, accelerates to produce
Product fault, shortening test period, dope product method of life characteristics under normal stress effect in the short period of time.No
Changing the premise that failure mechanism is accelerated life test, environmental stress or working stress that reinforcement product is born are by accelerating
The necessary means of life test.Accelerated life test is to shorten test period by reinforcement stress, if but stress is excessive, changes
Become the failure mechanism of product, then accelerated life test just loses meaning.If stress is less than normal, then test period can be caused to contract
Short and inconspicuous, accelerated life test cannot obtain optimal effect.Accelerated life test loading spectrum i.e. refers at accelerated aging
The stress strengthened in test and the relation corresponding to the relative time period.How the actual condition of bonded products, determines and does not changes
Sell of one's property product failure mechanism and the accelerated life test loading spectrum always puzzlement designer of preferable acceleration can be played
A difficult problem.
The reference material of external product accelerated life test can be retrieved at present, but have focused largely on grinding of statistical method
Studying carefully, the content about loading spectrum design is considerably less.In view of abroad China's correlation technique being taked closing policy, we are to state's external-navigation
How it bearing with solid lubricant designs accelerated life test loading spectrum is had no way of learning, China's accelerated aging to bearing with solid lubricant
The research of test is the most at the early-stage, and up to the present not yet there is the bearing with solid lubricant accelerated aging being suitable for engineer applied in China
Test load spectrum method for designing.
Summary of the invention
The present invention is to solve on the premise of not changing bearing with solid lubricant failure mechanism, it is achieved bearing with solid lubricant
Accelerated life test has the purpose of preferable acceleration effect, proposes a kind of bearing with solid lubricant combined stress accelerated life test
Loading spectrum method for designing, provides one for bearing with solid lubricant and does not change failure mechanism and acceleration effect the most significantly accelerates
Life test loading spectrum method for designing, the method practicality and workable, is the row to bearing with solid lubricant life appraisal
Effective accelerated method.
A kind of bearing with solid lubricant combined stress accelerated life test loading spectrum method for designing that the present invention proposes, specifically
For:
Step one, the operation on orbit section of acquisition bearing with solid lubricant.
Operation on orbit section refers to that these parts have been a kind of working condition figure that aerial mission is drawn in-orbit, its horizontal seat
Being designated as the time, vertical coordinate is loading stress corresponding to corresponding task and working condition.
Step 2, the loading spectrum block obtained is converted into loads typical spectrum block.
Loading spectrum be parts in real work, load subjected to stress, between the time used by working condition and every grade
Corresponding relation.The such as axial load suffered by this example middle (center) bearing, the rotating speed of bearing and the corresponding relation between the persistent period.
Loads typical spectrum block is the most representative, can reflect the different grades of loading spectrum of practical working situation.
Step 3, according to the failure mechanism of bearing with solid lubricant and Dynamic wear rule, loading spectrum block is carried out at classification
Reason.
Specifically, the present invention obtains above-mentioned purpose by subordinate's scheme.
A kind of bearing with solid lubricant accelerated life test loading spectrum method for designing, it is characterised in that comprise the following steps:
1) the operation on orbit section of bearing with solid lubricant is obtained;
2) the loading spectrum block obtained is converted into loads typical spectrum block;
3) according to failure mechanism and the Dynamic wear rule of bearing with solid lubricant, loading spectrum block is carried out staged care.
According to the method described in aforementioned schemes, it is characterised in that step 1) including: by analyzing in bearing with solid lubricant
The abrasion of lubricating film and transfer, provide the pass of plated film wear rate and retainer lubriation material transfer rate and applied stress respectively
System, obtains the abrasion of bearing with solid lubricant dynamic complex.
According to the method described in aforementioned schemes, it is characterised in that step 2) including: by directly intercepting the load that will obtain
Lotus spectrum is converted into loads typical spectrum block.
According to the method described in aforementioned schemes, it is characterised in that step 3) including: retainer transfer rate is higher than
Raceway groove plated film wear rate and cause the situation of lubricating film excess and/or retainer transfer rate less than raceway groove plated film wear rate
And the loading spectrum block causing lubricating film to lack merges.
According to the method described in aforementioned schemes, it is characterised in that step 3) including:
The abrasion of bearing with solid lubricant dynamic complex obtains in the following way:
For raceway groove plated film rate of depreciation, introducing speed and the time characterizes sliding distance, obtaining wear extent formula is:
Wherein W1For raceway groove plated film wear extent, p1For pressure, v1For sliding speed, t is test period, K1, a, b, c be all
The constant determined based on statistical data;
The relation between raceway groove plated film wear rate and accelerated stress is simulated by statistical data;In view of solid lubrication
The accelerated stress that bearing is conventional is rotating speed and axial load, and this relation is characterized as:
Ioff=F1(V,P) (2)
Wherein IoffRepresenting raceway groove plated film wear rate, V and P represents rotating speed and the amplitude of axial load stress respectively;
Polishing scratch based on retainer recessed in paraboloid shape, the expression formula of the frame lubricating film transfer amount that is maintained:
Wherein W2For retainer lubricating film transfer amount, p2For average Hertz contact force, D=v2T is sliding distance, K2、j、m
For the constant determined based on statistical data, v2For relative sliding velocity;Retainer lubriation material moves between speed and accelerated stress
Relation be:
Ibr=F2(V,P) (4)
Wherein IbrRepresent retainer lubriation material transfer rate;
The lubricating film volume W of attrition on inside and outside raceway groove is obtained based on (2) formula and (4) formulaoffT () and retainer are through rolling
The lubricating film volume W of transfer on the outer raceway groove of kinetoplastbr(t), thus obtain the Expression of lubrication film thickness under different stress
Formula:
Wherein δ is lubrication film thickness, δ0For raceway groove plated film original depth, A is raceway groove plated film area.According to aforementioned schemes institute
The method stated, it is characterised in that step 3) including:
The expression formula of described merging is:
Wherein N is the number of loading spectrum block, △ δiTotal lubricating film knots modification corresponding to i-th loading spectrum block, △ δA
For the lubricating film knots modification that accelerating load spectrum block is corresponding.
Advantages of the present invention and having the active effect that
(1) in the case of conventional life test loading spectrum determines, it is possible to accelerating solid lubrication bearing event largely
Barrier process, accelerates to obtain the speed of Test to Failure sample;
(2) provide based on spectrum block-grading and the loading spectrum method for designing of equivalent damage, it is possible to preferably reflection solid profit
The actual motion load section of plain besring;
(3) when designing bearing with solid lubricant accelerated life test loading spectrum, by adjusting amplitude and the time of stress, protect
Card does not change the failure mechanism of bearing with solid lubricant.
Accompanying drawing explanation
Fig. 1 is structure and the lubricating film transfer schematic diagram of bearing with solid lubricant;
Fig. 2 is bearing with solid lubricant accelerated life test loading spectrum method for designing;
Fig. 3 is the derivation of bearing with solid lubricant dynamic complex wear law;
Fig. 4 is the Elliptical Contacts region of rolling element and raceway groove.
Wherein accompanying drawing is to schematically illustrate present disclosure, not uses content shown in the drawings to the present invention
Content specifically limit.
Detailed description of the invention
Below in conjunction with the accompanying drawings and the embodiment bearing with solid lubricant accelerated life test loading spectrum design side to the present invention
Method is described in detail.
Fig. 1 is the schematic diagram of bearing with solid lubricant, and bearing with solid lubricant generally uses bearing internal external circle, retainer and rolling
The version that body combines.Wherein 1 is outer ring, and 2 is inner ring, and 3 is retainer, and 4 is the outer ring lubricating film on outer ring 1, and 5 is interior
Inner ring lubricating film on circle 2,6 is rolling element.Outer ring is held generally stationary, and inner ring generally rotates with the axis, in actual application two
The movement relation of person can also need to change, and i.e. can fix by inner ring 2, and outer ring 1 rotates.Between inner ring 1 and outer ring 2
When there is relative motion, rolling element 6 rotates.Outer ring lubricating film 4 is positioned in the raceway groove on the inner surface of outer ring 1, and inner ring lubricating film 5 is then
It is positioned in the raceway groove on inner ring 2 outer surface.The most popular material of lubricating film is molybdenum bisuphide.Lubricating film can use plated film
Mode prepare.Retainer 3 is the retainer of a kind of self-lubricating function, is made up, most frequently of " expendable " lubriation material
The material used is PI (polyimides) and MoS2.In bearing with solid lubricant operation process, raceway groove plated film plays lubrication;And
Retainer is then designed to controlled speed and mode and transfers on inside and outside raceway groove through rolling element rotation by the lubriation material of self,
Play the effect that the loss to lubricating film supplements, to keep lubricant effect.
As in figure 2 it is shown, the method being accelerated the design of life test loading spectrum is as follows:
Step one, the operation on orbit section of acquisition bearing with solid lubricant.At start of run, play the mainly ditch of lubrication
Road plated film.Along with contacting and mutually collision of the rotation of rolling element and rolling element and retainer, the lubriation material of retainer leads to
The rotation crossing rolling element is constantly shifted on raceway groove, and in the process, raceway groove plated film gradually wears out and consumes, and raceway groove plated film is gradually
Transition is transfer lubrication, and final transfer membrane plays primary lubricant effect, as shown in Figure 1.All consume to raceway groove plated film and transfer membrane
After, bearing gradually wears out until losing efficacy.During real-world operation, it is also possible to the feelings that lubriation material transfer velocity is too fast occur
Condition, causes lubriation material to be piled up on inside and outside raceway groove.Cause moment of friction excessive, make bearing stall or be difficult to smooth working, entering
And cause losing efficacy.Accordingly, it would be desirable to the abrasion of lubricating film and metastatic rule in further investigation bearing with solid lubricant, provide plated film respectively
Wear rate and retainer lubriation material transfer rate and the relation of applied stress, obtain bearing with solid lubricant dynamic complex abrasion rule
Rule, in order to the design of follow-up accelerated life test loading spectrum.
The derivation of bearing with solid lubricant dynamic complex wear law is as shown in Figure 3.For raceway groove plated film rate of depreciation,
Introducing speed and the time characterizes sliding distance, obtaining wear extent formula is:
Wherein W1For raceway groove plated film wear extent, p1For pressure, v1For sliding speed, t is test period, K1, a, b, c be all
The constant determined based on statistical data.
Rolling element belongs to point cantact with contacting of inside and outside raceway groove.According to Hertz contact theory, can by force analysis and
The external load (i.e. accelerated stress) applied obtains the stress distribution of contact area.Again based on macroscopic view theory of wear, can pass through
Statistical data simulates the relation between raceway groove plated film wear rate and accelerated stress.In view of conventional the adding of bearing with solid lubricant
Speed stress is rotating speed and axial load, and this relation can be characterized as:
Ioff=F1(V,P) (8)
Wherein IoffRepresenting raceway groove plated film wear rate, V and P represents rotating speed and the amplitude of axial load stress respectively.
The transfer rate of retainer lubriation material equally obtains based on tribology method.Polishing scratch based on retainer
Recessed in paraboloid shape, provide the expression formula of retainer lubricating film transfer amount:
Wherein W2For retainer lubricating film transfer amount, p2For average Hertz contact force, D=v2T is sliding distance, K2、j、m
For the constant determined based on statistical data, v2For relative sliding velocity.It is equally based on macroscopic view theory of wear and contacts reason with Hertz
Opinion.Utilizing the methods such as finite element analysis, can be maintained the relation between frame lubriation material transfer rate and accelerated stress, table
Levy for:
Ibr=F2(V,P) (10)
Wherein IbrRepresent retainer lubriation material transfer rate.In conjunction with actual load history, can be divided into based on (8) formula
(10) formula is calculated the lubricating film volume W of attrition on inside and outside raceway grooveoffT () and retainer are through the inside outer fissure of rolling element
The lubricating film volume W of transfer on roadbr(t), and then the Expression formula of lubrication film thickness under different stress can be given:
Wherein δ is lubrication film thickness, δ0For raceway groove plated film original depth, A is raceway groove plated film area.Above-mentioned lubrication film thickness
Expression formula i.e. characterize bearing with solid lubricant dynamic complex abrasion.According to Dynamic wear rule and obtain based on statistical data
Fault threshold can obtain physical essence and the coupled relation of bearing with solid lubricant failure mechanism under different stress level, for it
The design of accelerated life test loading spectrum lays the foundation.
Step 2, the loading spectrum block obtained is converted into loads typical spectrum block.Because the acceleration that bearing with solid lubricant is conventional
Stress has two rotating speeds and axial load, and the bearing with solid lubricant that reality is in-orbit may bear increasingly complex stage
Loading spectrum, so, by directly intercepting, the loading spectrum obtained can be converted into loads typical spectrum block.
Step 3, according to the failure mechanism of bearing with solid lubricant and Dynamic wear rule, loading spectrum block is divided into level Four, I
Level represents that retainer transfer rate is too fast, and under this kind of stress level, bearing with solid lubricant will quickly be formed on inside and outside raceway groove
Amount lubricating film, causes stall to be quickly invalidated.This kind of loading spectrum block typically will not occur in engineering reality, or in whole load
Ratio shared in lotus spectrum is the least, but can quickly cause bearing fault, thus belongs to the loading spectrum block changing failure mechanism,
Reservation is should give during loading spectrum establishment.II level represents that retainer transfer rate is higher than raceway groove plated film wear rate, but will not be short
Cause lubricating film excess in time, engineering reality is often reflected as moment of friction bigger than normal, cause after extended periods losing efficacy.
III level represents that retainer transfer rate is less than raceway groove plated film wear rate, thus bearing can progressively consume raceway groove plated film and transfer
Film, finally causes losing efficacy because of lubricating film disappearance.IV level represents retainer transfer rate and raceway groove plated film wear rate the most very
Slowly, in such cases, bearing lubrication film thickness is kept approximately constant, thus this type of loading spectrum block performance to bearing with solid lubricant
Degenerate and the impact in life-span almost can be ignored;For bearing with solid lubricant in orbit, this type of load occupies significant proportion,
Generally can omit when loading spectrum is worked out.
To above II level and III level loading spectrum block, generally use the shape of merging when working out accelerated life test loading spectrum
Formula.For bearing with solid lubricant, the principle of merging is equivalent damage principle (i.e. equivalence lubrication film thickness knots modification).II level carries
What lotus spectrum block was corresponding is transfer membrane excess fault, and corresponding lubrication film thickness increases, and its combination principle is:
Wherein N is the number of II level loading spectrum block, △ δiTotal lubricating film corresponding to i-th II level loading spectrum block changes
Variable, △ δAFor the lubricating film knots modification that accelerating load spectrum block is corresponding.According to calculated △ δA, can adopt based on formula (11)
Calculate the value of accelerated stress V and P with optimization method, also need during practical operation to consider engineering realizability.
What III level loading spectrum block was corresponding is lubricating film miss fault, and corresponding lubrication film thickness reduces, combination principle and II level
Loading spectrum block is identical.
Example:
Use the inventive method as follows to the design of certain spaceborne bearing with solid lubricant accelerated life test loading spectrum:
First the working environment analyzing bearing with solid lubricant and the stress born, and carry out the selection of accelerated stress.Gu
Body lubrication bearing is a kind of spaceborne transmission component of basic space flight, is widely used in each quasi-instrument and the mechanism of spacecraft.
The environmental stress that bearing with solid lubricant bears mainly has temperature, radiation etc., and working stress mainly has rotating speed, radial load, axially
Load etc..
In real work, how bearing with solid lubricant is caused by insufficient lubrication or abrasion if losing efficacy.Solid lubricant film gradually wears out
Consume, destruction of lubricating film and cause bearing moment increase or vibration increase, ultimately result in inefficacy.Carry out bearing with solid lubricant acceleration
During life test, main selection rotating speed and axial load are as accelerated stress.
Table 1 gives certain spaceborne bearing with solid lubricant load history in-orbit, and experience total time in each cycle is 11min.
Load history shown in table 1 is divided into 6 stages, and the most corresponding corresponding operating mode, i.e. low speed in-orbit rotate forward, low-speed reverse rotation
Turn, high-speed forward rotation, the stage such as high-speed reverse rotation.Because the accelerated stress that bearing with solid lubricant is conventional has two, will
To loading spectrum block be converted into loads typical spectrum block.Failure mechanism according to bearing with solid lubricant and Dynamic wear rule are permissible
Its loading spectrum block being divided into level Four, wherein can be intercepted in the 1-5 stage in table 1 and compose block for II level and III level, the 6th stage was I level spectrum
Block.
Certain spaceborne bearing with solid lubricant load history in-orbit of table 1
Spacecraft mechanism bearing with solid lubricant is generally operational under underloading speed operation.And for rolling body bearing, often execute
Add certain axial pretightening load to improve rigidity and the running accuracy of bearing.Calculate for simplifying the analysis, do following two herein
Point is assumed:
1) under speed operation, the produced inertial load of rolling element motion is ignored.
2) under space microgravity environment, rolling body bearing is subjected only to prefastening load.
When bearing bears central axial prefastening load Fa, the contact load Q of each rolling element is identical, i.e.
In formula, Z is the number of rolling element, and α is bearing the actual contact angle.Theoretical according to point cantact Hertz, according to point cantact
Hertz theory, the contact area of rolling element and inside and outside raceway groove is oval.Set up coordinate system s={o, x y z}, the initial point o of coordinate system s
Being located at elliptical center, x-axis is along transverse direction, and y-axis points to the rotating direction of rolling element along ellipse short shaft, and z-axis is along contact surface
Normal direction, as shown in Figure 4, elliptical contact any point (x, y) contact force at place is:
In formula, p0For the Max.contact stress of elliptical contact, a, b are respectively oval long and short semiaxis according to maximum
The computing formula of Hertz contact stress, obtaining its Max.contact stress is:
π e in formulaaebFor constant, Hertz contact coefficient table can be looked into and obtain, ∑ ρ2For contact object principal curvatures and, this
In take εE=1.
The motion analysis following several presupposition of introducing to rolling body bearing:
1) bearing outer ring is fixed, inner ring rotates;
2) under speed operation, the contact angle of bearing internal external circle is identical, and does not consider the gyration of rolling element;
3) rolling element only rolls at bearing outer ring channel, and has spin in the existing rolling of bear inner ring grooved railway.
4) (x, y) (x is y) along ellipse at this to the relative sliding velocity v of place's rolling element and bear inner ring grooved railway to elliptical contact point
(x, y) (x, vector y) are shown in Fig. 4 to the differential sliding speed v 1 of circle short-axis direction with revolving sliding speed v 2.
Point (x, y) place's sliding speed v (x, y) be:
In formula, ω is the absolute angular velocities that bearing inner race rotates;(x, y) is elliptical contact x to g, the function of y, with bearing
Geometrical property, operating mode (load) etc. are relevant.
From formula (7), rolling element and any point (x, y) the line wear rate of place's solid lubricant film in raceway groove elliptical contact
For:
As shown in Figure 4, at point, (x, y) place takes minute area unit dxdy.From formula (4), each rolling element and ditch stage property
Having identical contact, by γ, (x, y) is integrated in elliptical contact, can obtain the abrasion of bearing inner race raceway groove solid lubrication membrane volume
Rate w is:
In formula, Ω is the elliptical contact of rolling element and bearing inner race raceway groove.Formula (14), (16) are substituted into formula (18) and obtain
Arrive:
A in formulai, biIt is respectively rolling element and the semi-major axis of bearing inner race raceway groove elliptical contact and semi-minor axis, subscript i table
Show inner ring.
Order
Parameter K3Relevant with elliptical contact shape, bearing operating mode and bearing geometrical property etc..
Now, formula (19) is represented by:
At stable wear stage it is believed that the Volume erosion rate w of solid lubricant film1Keep constant in time.Now, formula (7)
In parameter c=1, take K=K1K3=4.0 × 10-9.Bearing with solid lubricant wear out failure model under checking vacuum environment, needs
Obtain testing data of life-span under vacuum environment, and obtain corresponding parameter K according to the testing data of life-span under vacuum environment1、K3、
The numerical values recited of a, b, owing to experiment condition is limited, the working condition of actual bearing with solid lubricant in-orbit is complex, it is impossible to
Ground obtains its accurate numerical values recited, according to statistical data, takes a=0.127, b=1.3849.In like manner, can be in the hope of retainer
Lubricating film transfer amount is represented by:
Ibid, K is taken2=1.2 × 10-8, j=0.103, m=1 then can be in the hope of:
In the loading spectrum block of corresponding II level and III level, the knots modification of the lubricating film of i-th spectrum block is:
δi=W1-W2 (23)
First five stage of table 1 correspondence is intercepted and composes block for II level and III level,
Certain first five stage of spaceborne bearing with solid lubricant of table 2 intercepts
Therefore can be obtained by above formula (21) (22) (23):
δ1=2.5069 × 10-5-3.0930×10-5=-5.8610 × 10-6
δ3=4.4105 × 10-5-3.1727×10-5=1.2379 × 10-5
δ5=0.0011-5.9539 × 10-4=4.5549 × 10-4
According on the premise of not changing bearing with solid lubricant failure mechanism, according to actual condition, II and III level are composed block
Merging so that it is having acceleration effect as well as possible, here we take axial load 20N, rotating speed 240rpm merges as it
Rear operating mode, then try to achieve the acceleration time according to formula (11) (21) (22):
T=253.5394s=4.2257min
The time in one cycle of experience can be equivalent to 5.2257min.Finally, the constant stress life testing spectrum of bearing with solid lubricant
As table 3 is shown as:
Certain spaceborne bearing with solid lubricant constant stress life testing spectrum of table 3
By above-mentioned accelerated life test loading spectrum translation method, bearing with solid lubricant failure mechanism can not changed
Under premise, utilize the typical condition taked, the bearing with solid lubricant in six stages originally load history in-orbit is equivalent to
State two typical stages, the total time used by each of which cycle be also reduced to 5.2257min by original 11min, added quick-acting
Fruit is the most obvious, it is possible to the crashed process of accelerating solid lubrication bearing largely, thus obtains and effectively accelerate the longevity
Life test load spectrum.
Obviously, above-described embodiment is only for clearly demonstrating example of the present invention, and not to the present invention
The restriction of embodiment.For those of ordinary skill in the field, can also be made it on the basis of the above description
The change of its multi-form or variation.Here without also cannot all of embodiment be given exhaustive.And these belong to this
What bright spirit was extended out obviously changes or changes among still in protection scope of the present invention.
Claims (6)
1. a bearing with solid lubricant accelerated life test loading spectrum method for designing, it is characterised in that comprise the following steps:
1) the operation on orbit section of bearing with solid lubricant is obtained;
2) the loading spectrum block obtained is converted into loads typical spectrum block;
3) according to failure mechanism and the Dynamic wear rule of bearing with solid lubricant, loading spectrum block is carried out staged care.
Method the most according to claim 1, it is characterised in that step 1) including:
By analyzing abrasion and the transfer of lubricating film in bearing with solid lubricant, provide plated film wear rate and retainer lubrication material respectively
Material transfer rate and the relation of applied stress, obtain the abrasion of bearing with solid lubricant dynamic complex.
Method the most according to claim 1, it is characterised in that step 2) including:
By directly intercepting, the loading spectrum obtained is converted into loads typical spectrum block.
Method the most according to claim 1, it is characterised in that step 3) including:
For retainer transfer rate higher than raceway groove plated film wear rate and cause lubricating film excess in the case of and/or retainer turn
The loading spectrum block that shifting speed causes lubricating film to lack less than raceway groove plated film wear rate merges.
Method the most according to claim 2, it is characterised in that step 3) including:
The abrasion of bearing with solid lubricant dynamic complex obtains in the following way:
For raceway groove plated film rate of depreciation, introducing speed and the time characterizes sliding distance, obtaining wear extent formula is:
Wherein W1For raceway groove plated film wear extent, p1For pressure, v1For sliding speed, t is test period, K1, a, b, c be all based on system
Count the constant determined;
The relation between raceway groove plated film wear rate and accelerated stress is simulated by statistical data;In view of bearing with solid lubricant
Conventional accelerated stress is rotating speed and axial load, and this relation is characterized as:
Ioff=F1(V,P) (2)
Wherein IoffRepresenting raceway groove plated film wear rate, V and P represents rotating speed and the amplitude of axial load stress respectively;
Polishing scratch based on retainer recessed in paraboloid shape, the expression formula of the frame lubricating film transfer amount that is maintained:
Wherein W2For retainer lubricating film transfer amount, p2For average Hertz contact force, D=v2T is sliding distance, K2, j, m be base
In the constant that statistical data determines, v2For relative sliding velocity;
Relation between retainer lubriation material transfer rate and accelerated stress is:
Ibr=F2(V,P) (4)
Wherein IbrRepresent retainer lubriation material transfer rate;
The lubricating film volume W of attrition on inside and outside raceway groove is obtained based on (2) formula and (4) formulaoffT () and retainer are through rolling element
The inwardly lubricating film volume W of transfer on outer raceway groovebr(t), thus obtain the Expression formula of lubrication film thickness under different stress:
Wherein δ is lubrication film thickness, δ0For raceway groove plated film original depth, A is raceway groove plated film area.
Method the most according to claim 4, it is characterised in that step 3) including:
The expression formula of described merging is:
Wherein N is the number of loading spectrum block, △ δiTotal lubricating film knots modification corresponding to i-th loading spectrum block, △ δAFor adding
The lubricating film knots modification that speed loading spectrum block is corresponding.
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CN106885702A (en) * | 2017-01-24 | 2017-06-23 | 中车株洲电力机车研究所有限公司 | A kind of rail transit rolling stock equipment life appraisal procedure |
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CN109708889A (en) * | 2019-01-09 | 2019-05-03 | 四川大学 | The horizontal choosing method of accelerated stress of space grease lubrication bearing accelerated life test |
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CN106885702A (en) * | 2017-01-24 | 2017-06-23 | 中车株洲电力机车研究所有限公司 | A kind of rail transit rolling stock equipment life appraisal procedure |
CN107664575A (en) * | 2017-08-30 | 2018-02-06 | 中国科学院上海技术物理研究所 | A kind of life test method of spaceborne solid lubrication sweep mechanism complete machine |
CN107796927A (en) * | 2017-09-14 | 2018-03-13 | 北京精密机电控制设备研究所 | A kind of storage acceleration test apparatus of lubricating grease |
CN109708889A (en) * | 2019-01-09 | 2019-05-03 | 四川大学 | The horizontal choosing method of accelerated stress of space grease lubrication bearing accelerated life test |
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 |
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 |
CN111896255A (en) * | 2020-08-12 | 2020-11-06 | 上海理工大学 | Method for rapidly evaluating service life of hub bearing based on multi-axis random road load |
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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 |
CN113390607A (en) * | 2021-05-14 | 2021-09-14 | 东方电气集团科学技术研究院有限公司 | Non-contact displacement testing method for flow-induced vibration of tube bundle structure |
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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