CN104880362A - Self-coordinated transverse micromotion loading device for micromotion fatigue testing - Google Patents
Self-coordinated transverse micromotion loading device for micromotion fatigue testing Download PDFInfo
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- CN104880362A CN104880362A CN201510243706.5A CN201510243706A CN104880362A CN 104880362 A CN104880362 A CN 104880362A CN 201510243706 A CN201510243706 A CN 201510243706A CN 104880362 A CN104880362 A CN 104880362A
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Abstract
The invention relates to a self-coordinated transverse micromotion loading device for micromotion fatigue testing. The self-coordinated transverse micromotion loading device comprises a fixed base and two cantilever beams which are arranged side by side; the middle parts of two cantilever beams are testing stations for placing a tubular product to be tested, a bearing is fixed at one end of one of the cantilever beams and is arranged at the outer side of the cantilever beam relative to the other cantilever beam, the bearing can be rotationally arranged on a rotating shaft which is located on the fixed base, and a loading mechanism is arranged at the free ends of the two cantilever beams and is used for adjusting a distance between two cantilever beams and for micromotion loading. The self-coordinated transverse micromotion loading device for micromotion fatigue testing has good stability, high reliability and high precision, and has a loading self-coordination function.
Description
Technical field
The present invention relates to fatigue of materials performance test field, especially a kind of fretting fatigue testing sample to various shape apply horizontal fine motion load and produce micro-moving frictional wear time there is self-coordinating and reliable and stable charger.
Background technology
Fine motion is the relative motion of the amplitude occurred between two surface in contacts minimum (being generally micron dimension), usually occurs in the approximate friction tight surface in contact under vibration environment, under plus load effect, then form fretting fatigue with tired acting in conjunction.Fretting fatigue can cause surface in contact rubbing wear, produces material unaccounted-for (MUF) and scantling change; Also can accelerate germinating, the expansion of crackle, the fatigue lifetime of structure is reduced greatly.Its phenomenon is extensively present in machinery, traffic, electric power, Aero-Space, and even the fields such as biomedical engineering, it can accelerate fatigue crack initiation and the expansion of parts, thus obviously reduces service life, even cause catastrophic failure, therefore fretting damage is called as " cancer " in industry.Research shows, fine motion can make reduce by 20% ~ 80% the fatigue lifetime of component, even lower.Though the research at present about fretting fatigue is many, does not all obtain important breakthrough, mainly concentrate on: the germinating of Fretting Fatigue Damage mechanism, crackle and expansion, to aspects such as effective controls of fatigue lifetime.To the evaluation criterion also not yet unification of Fretting Fatigue Damage.More there is no the testing standard of special fretting fatigue and test horizontal charger.
The experimental provision of domestic and international research fretting fatigue mainly can be divided into bridge-type fine motion pad and column type fine motion pad etc. according to the structure difference of fine motion pad.The former is a kind of face contact device, and no matter its advantage is bending if being or under action of pulling stress, fine motion pad is fixed on fatigue criterion sample by stress loop or other pre-tightening apparatus.Before the nineties in 20th century, this device is widely adopted, and its structure is simple, but comes with some shortcomings, and first, fine motion bridge is not rigid body completely, and distortion causes and the bad description of contact conditions between sample; Secondly, even in full symmetric situation, two fine motion bridge pin also can not be coordinated to slide completely the samely, cause slip region to be difficult to determine.The latter is a kind of experimental provision of linear contact lay, and late 1960s is brought into use, this device accept by numerous researcher.But this device in use also exists some problems, as bad in fine motion system rigidity, fine motion pad relative sliding is too large, causes its axial displacement large, and it is that load is unstable that transverse load can change in fatigue process.
At present, in the fretting fatigue such as tubing, sheet material process, often due to the stability of inching gear and reliability poor, cause test findings very undesirable, test findings truly can not reflect the performance of actual fretting fatigue.Based on general fretting fatigue testing charger less stable, the situations such as imposed load undulatory property is larger.So, when material fretting fatigue testing, must design a kind of to the reliable test unit of sample applying transverse loading stability, thus when making sample be subject to axial load and relative sliding occurs, transverse load will not change.And the work that the structure such as micromotion structure, hold-down support also can be reliable and stable in whole process of the test.Therefore, design a set of good rigidly, the fretting fatigue horizontal charger while system stability with load self-coordinating function has great importance.
Summary of the invention
In order to what overcome existing fretting fatigue testing horizontal fine motion charger, not there is the poor deficiency of the effect of self-coordinating load, less stable, reliability, the invention provides a kind ofly to have good stability, reliability is strong, the horizontal fine motion charger of self-coordinating formula fretting fatigue testing with the effect of load self-coordinating.
The technical solution adopted for the present invention to solve the technical problems is:
The horizontal fine motion charger of a kind of self-coordinating formula fretting fatigue testing, comprise firm banking, described horizontal fine motion charger also comprises two semi-girders, two semi-girders are arranged side by side, the middle part of two semi-girders is the test station for placing tubing to be tested, one end solid bearing of semi-girder, described bearing is positioned at the outside of a semi-girder relative to another root semi-girder, described bearing is installed in rotation in rotating shaft, described rotating shaft is positioned on firm banking, the other end of described two semi-girders installs the load maintainer for the spacing fine motion loading regulating two semi-girders.
Further, described load maintainer comprises spiral loader, load transducer and two connecting screw rods, the middle part of described connecting screw rod is through a described semi-girder, the front end of described connecting screw rod is fixedly connected with another root semi-girder, the rear end of described connecting screw rod is fixedly connected with screw rod web joint, described spiral loader is arranged on described screw rod web joint, and the outside installed load sensor of a described semi-girder, the actuating strut of described spiral loader coordinates with described load transducer.
Further again, the rear end of described connecting screw rod is passed the connecting hole of screw rod web joint and is connected by hold-down nut, and the front end of described connecting screw rod is passed the connecting hole of another root semi-girder and connected by hold-down nut.
Further, the opposite face at the middle part of described two semi-girders installs fine motion pad, is described test station between two fine motion pads.
Transverse slider is installed in described rotating shaft, described transverse slider can laterally be slidably mounted on cross slide way, the two ends of described cross slide way can slide up and down to be arranged on column, the lower end of described column can be sleeved on longitudinal slide rail with longitudinal sliding, and described longitudinal slide rail is fixedly mounted on described firm banking.
Technical conceive of the present invention is: have the horizontal charger providing self-coordinating to decline dynamic loading, be firm banking, three-axis moving mechanism, the band cantilever beam structure of bearing, fine motion pad stationary installation, the acting in conjunction of fine motion load maintainer provide transverse load to fine motion sample.First firm banking is secured by bolts on testing machine.Secondly, arrange three-axis moving mechanism: by the side of cross sliding clock structure installment in firm banking, adjust the distance of two pairs of slide blocks, make the distance between two of slide block structure axles be the outside dimension of designed fretting fatigue sample.Being loaded on slide block structure by the cantilever beam structure of band bearing, bearing is placed on slide block axle upper end.Described bearing and axle are clearance fit, and bearing possess the lock-screw carried; Semi-girder is fixed by the lock-screw on bearing after adjusting height according to testing machine and test sample.Again, fine motion pad is installed the middle with semi-girder by bolt, sample is by the upper and lower grips of testing machine and by described a pair fine motion pad.Finally, fine motion loading system is fixed on the free end of semi-girder by screw rod, thus can apply to stablize, transverse load reliably.The load value applied can be shown by the indicator gauge that load transducer is supporting.Now, whole inching gear will keep geo-stationary with testing machine.In the process of fretting fatigue testing, static inching gear and the sample of axial inching exist and slide, thus reach the effect of fretting fatigue.
The effect of patent of the present invention is mainly manifested in: device has the adjustable performance in XYZ tri-directions, can adjust position according to various sample different size.Whole semi-girder has the principle of the lever of enlarging function, makes the load of fine motion place be 2 times of free end imposed load.The spiral force application apparatus of free end has the function of location and bit shift compensation, and two boards therefore can be allowed to keep initial position, thus ensures that load is constant, and therefore device has the effect of self-coordinating.The fine motion charger of free end is improved by micrometer caliper and obtains, and makes the loaded load precision 0.1N that also tool is very high.The shape material adopted due to whole device, the larger whole device rigidity of cantilever beam structure size are fine.Apparatus of the present invention structure is simple, easy to operate, rational in infrastructure, connect reliable and stable, load self-coordinating when reliably carrying out fretting test to fine motion sample.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the horizontal fine motion charger of self-coordinating formula fretting fatigue testing.
Fig. 2 is the vertical view of Fig. 1.
The schematic diagram of Tu3Shi three-axis moving mechanism.
Fig. 4 is the schematic diagram of the transverse slider of tape spool.
Fig. 5 is the schematic diagram of semi-girder.
Fig. 6 is the schematic diagram of fine motion pad stationary installation.
Fig. 7 is the schematic diagram of spiral load maintainer.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
With reference to Fig. 1 ~ Fig. 7, the horizontal fine motion load charger of a kind of self-coordinating formula fretting fatigue testing, comprise firm banking 1, described horizontal fine motion charger also comprises two semi-girders 3, two semi-girders 3 are arranged side by side, the middle part of two semi-girders 3 is the test station for placing tubing 6 to be tested, one end solid bearing 7 of semi-girder 3, described bearing 7 is positioned at the outside of a semi-girder relative to another root semi-girder, described bearing 7 is installed in rotation in rotating shaft, described rotating shaft is positioned on firm banking, the other end of described two semi-girders 3 installs the load maintainer 5 for the spacing fine motion loading regulating two semi-girders.
Further, described load maintainer comprises spiral loader 51, load transducer 52 and two connecting screw rods 53, the middle part of described connecting screw rod 53 is through a described semi-girder, the front end of described connecting screw rod 53 is fixedly connected with another root semi-girder, the rear end of described connecting screw rod 53 is fixedly connected with screw rod web joint 54, described spiral loader 51 is arranged on described screw rod web joint 54, the outside installed load sensor 52 of a described semi-girder, the actuating strut of described spiral loader 51 coordinates with described load transducer 52.
Further again, the rear end of described connecting screw rod 53 is passed the connecting hole of screw rod web joint and is connected by hold-down nut, and the front end of described connecting screw rod 53 is passed the connecting hole of another root semi-girder and connected by hold-down nut.
Further, the opposite face at the middle part of described two semi-girders 3 is installed between fine motion pad 4, two fine motion pads 4 is described test station.
Described rotating shaft is installed transverse slider 2, described transverse slider 2 can laterally be slidably mounted on cross slide way, the two ends of described cross slide way can slide up and down to be arranged on column, the lower end of described column can be sleeved on longitudinal slide rail with longitudinal sliding, and described longitudinal slide rail is fixedly mounted on described firm banking 1.
Three-axis moving mechanism is L-type structure, is formed by connecting by section bar angle bar, and it is respectively with the guide groove along XYZ tri-directions; Described firm banking 1 is fixed with testing machine, two crossbeams in its front are completely parallel, for connecting the slide block structure of tape spool, two crossbeams can move along the upper and lower Z-direction of base, and the framed structure that meanwhile adjacent two crossbeams and vertical guide groove form can move along front and back Y-direction.The transverse slider 2 of described band rotating shaft is shown in that Fig. 4 slide block has screw in detail, axle sleeve is overall by lock-screw locking composition after entering transverse slider, the transverse slider structure of 1 pair of described tape spool with can the cross slide way of transversely X-direction slide, and with fastening bolt on cross slide way, after adjusting the position of X-direction, transverse slider and guide groove can be made to fix.Fig. 5 is shown in by the semi-girder 3 of described band bearing, beam end then according to the threaded hole of bearing seat corresponding have 4 holes, one end of every block beam is all vertically arranged symmetrically with two bearings with bearing seat in edge, and bearing of telling is connected with semi-girder by bolt; Described semi-girder is tightened together by bolts and nuts with bearing; There are two threaded holes of fixing fine motion pad 4 middle part of described semi-girder, and two threaded holes are arranged symmetrically with about the center line of beam.The free end of described semi-girder 3 has for the hole of installed load charger and every block semi-girder has two holes, and the mid point in described two holes and semi-girder stiff end bearing center are about fine motion pad 4 Central Symmetry.Fine motion pad fixture structure is shown in Fig. 6, and fine motion pad 4 is fixed on semi-girder 3 mainly through bolt by it, and fine motion pad is positioned at the middle of semi-girder, and a pair fine motion pad is symmetrically arranged on two blocks of semi-girders respectively, and fine motion pad contacts with fretting fatigue sample.Described fine motion load maintainer is shown in Fig. 7, and be made up of spiral loader, load transducer and two connecting screw rods etc., described device is connected with two pieces of beams by screw rod, and is fixed by nut with wherein one piece of beam, keeps free state with other one piece of beam; Described load transducer is secured by bolts in and is on the beam of free state with screw rod, and ensures that its fixed position is the center of two screw rods; Described spiral loader there is threaded hole to be connected with screw rod by nut, and can interfix.Loading head and the pressure transducer of described spiral loader are in sustained height.
Described semi-girder 3 is by the slide block of bearing and tape spool to connecting, and its beam freely can rotate around axle, but the displacement on its vertical direction is limited by the trip bolt that bearing carries, and the distance between two axles is specimen size and two fine motion pad size sums.
Described fine motion loading structure, the distance between two screw rods is the distance between the holes of spiral loader, and two screw rods and the wherein inside and outside both sides of one block of plate add nut and fix, and two holes of other one piece of beam should slightly larger than the diameter of screw rod.Thus when making screw rod pass beam, can not rub with beam hole.
Described device is loaded by spiral loader compression sensor, the registration of load transducer is read by its supporting indicator gauge, the fine motion load at fine motion pad place is then the twice of indicator gauge reading, namely imposed load acts on semi-girder free end thus makes the transverse load at fine motion pad place be the twice of free end imposed load, and this semi-girder has leverage simultaneously.
After having assembled with reference to Fig. 1 and Fig. 2 when concrete test, be fixed on together with sample on grip of testing machine and tested.
The device of the present embodiment has the adjustable performance in XYZ tri-directions, can adjust position according to various sample different size.Because semi-girder one end of device freely in addition connects by bearing the effect that it does not bear moment of flexure in one end, therefore when sample is positioned at fine motion place, whole semi-girder has the principle of lever, makes the load of fine motion place be 2 times of free end imposed load.Because fatigue testing specimen applies fine motion load by two pieces of good beam clampings of rigidity.Therefore, in process of the test when fine motion load changes, the location status that therefore function that the spiral charger due to free end has location and bit shift compensation can allow two boards keep initial.Thus ensure that load is constant, therefore there is the effect of self-coordinating.The fine motion charger of free end is improved by micrometer caliper and obtains in addition, rotates advance compression sensor obtain corresponding load with it.Due to micrometer caliper high precision (0.0001mm) thus make the loaded load precision 0.1N that also tool is very high.
Claims (5)
1. the horizontal fine motion charger of self-coordinating formula fretting fatigue testing, comprise firm banking, it is characterized in that: described horizontal fine motion charger also comprises two semi-girders, two semi-girders are arranged side by side, the middle part of two semi-girders is the test station for placing tubing to be tested, one end solid bearing of semi-girder, described bearing is positioned at the outside of a semi-girder relative to another root semi-girder, described bearing is installed in rotation in rotating shaft, described rotating shaft is positioned on firm banking, the other end of described two semi-girders installs the load maintainer for the spacing fine motion loading regulating two semi-girders.
2. the horizontal fine motion charger of self-coordinating formula fretting fatigue testing as claimed in claim 1, it is characterized in that: described load maintainer comprises spiral loader, load transducer and two connecting screw rods, the middle part of described connecting screw rod is through a described semi-girder, the front end of described connecting screw rod is fixedly connected with another root semi-girder, the rear end of described connecting screw rod is fixedly connected with screw rod web joint, described spiral loader is arranged on described screw rod web joint, the outside installed load sensor of a described semi-girder, the actuating strut of described spiral loader coordinates with described load transducer.
3. the horizontal fine motion charger of self-coordinating formula fretting fatigue testing as claimed in claim 2, it is characterized in that: the rear end of described connecting screw rod is passed the connecting hole of screw rod web joint and connected by hold-down nut, the front end of described connecting screw rod is passed the connecting hole of another root semi-girder and is connected by hold-down nut.
4. the horizontal fine motion charger of the self-coordinating formula fretting fatigue testing as described in one of claims 1 to 3, is characterized in that: the opposite face at the middle part of described two semi-girders installs fine motion pad, is described test station between two fine motion pads.
5. the horizontal fine motion charger of the self-coordinating formula fretting fatigue testing as described in one of claims 1 to 3, it is characterized in that: transverse slider is installed in described rotating shaft, described transverse slider can laterally be slidably mounted on cross slide way, the two ends of described cross slide way can slide up and down to be arranged on column, the lower end of described column can be sleeved on longitudinal slide rail with longitudinal sliding, and described longitudinal slide rail is fixedly mounted on described firm banking.
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| CN109900556A (en) * | 2019-04-12 | 2019-06-18 | 中北大学 | A kind of self-coordinating formula fretting fatigue testing transverse direction fine motion loading device |
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| CN108931426B (en) * | 2018-05-31 | 2021-03-02 | 西北工业大学 | Fretting fatigue loading device and fretting fatigue testing device |
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