CN104880362B - Self-coordinating formula fretting fatigue testing transverse direction fine motion loading device - Google Patents
Self-coordinating formula fretting fatigue testing transverse direction fine motion loading device Download PDFInfo
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- CN104880362B CN104880362B CN201510243706.5A CN201510243706A CN104880362B CN 104880362 B CN104880362 B CN 104880362B CN 201510243706 A CN201510243706 A CN 201510243706A CN 104880362 B CN104880362 B CN 104880362B
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Abstract
A kind of self-coordinating formula fretting fatigue testing transverse direction fine motion loading device, including firm banking, the horizontal fine motion loading device also includes two cantilever beams, two cantilever beams are arranged side by side, it is the experiment station for placing tubing to be tested in the middle part of two cantilever beams, one end fixing bearing of cantilever beam, the bearing is located at a cantilever beam relative to another outside of cantilever beam, the bearing is installed in rotation in rotating shaft, the rotating shaft is located on firm banking, install for distance between two cantilever beams of regulation and the load maintainer of fine motion loading the free end of two cantilever beams.The present invention provide it is a kind of have good stability, highly reliable, high precision, the self-coordinating formula fretting fatigue testing transverse direction fine motion loading device with the effect of load self-coordinating.
Description
Technical field
It is especially a kind of to variously-shaped fretting fatigue testing sample the present invention relates to fatigue of materials performance test field
When applying horizontal fine motion load and producing micro-moving frictional wear with self-coordinating and reliable and stable loading device.
Background technology
Fine motion is the relative motion of the amplitude minimum (usually micron dimension) occurred between two contact surfaces, is generally occurred
The contact surface of approximate tight fit under vibration, then to cooperatively form fine motion with fatigue tired under plus load effect
Labor.Fretting fatigue can cause contact surface fretting wear, produce material loss and scantling change；Crackle can also be accelerated
Germinating, extension, substantially reduce the fatigue life of structure.Its phenomenon is widely present in machinery, traffic, electric power, Aero-Space,
Or even the field such as biomedical engineering, it can accelerate fatigue crack initiation and the extension of parts, so as to substantially reduce the longevity of being on active service
Life, or even catastrophic failure is caused, therefore fretting damage is referred to as " cancer " in industry.Research shows that fine motion can make component
Fatigue life reduce by 20%~80%, it is even lower.Though the current research on fretting fatigue is many, do not obtain great
Break through, be concentrated mainly on:Fretting Fatigue Damage mechanism, the germinating of crackle and extension, to aspects such as effective controls of fatigue life.
Evaluation criterion to Fretting Fatigue Damage is also not yet unified.Testing standard and its experiment more without special fretting fatigue are laterally
Loading device.
The experimental provision of research fretting fatigue can be divided mainly into bridge-type fine motion pad according to the structure difference of fine motion pad both at home and abroad
With column type fine motion pad etc..The former be a kind of face contact device, the advantage is that either bending or action of pulling stress under it is micro-
Dynamic pad can be fixed on fatigue criterion sample by NOL ring or other pre-tightening apparatus.The device quilt before the nineties in 20th century
It is widely used, its simple structure, but come with some shortcomings, first, fine motion bridge is not complete rigid body, and deformation is caused between sample
The bad description of contact conditions；Secondly, even in the case of full symmetric, two fine motion bridge pin are also impossible to assist exactly in unison
Adjust and slide, cause slip region to be difficult to determine.The latter is a kind of experimental provision of linear contact lay, and late 1960s begin to use,
The device is received by numerous researchers.But the device there is also some problems, such as fine motion system rigidity in use
Bad, fine motion pad is relative to be slided too big, causes its axial displacement big, and transverse load can change i.e. load in fatigue process
It is unstable.
At present, during the fretting fatigues such as tubing, sheet material, often the stability and reliability due to inching gear compared with
Difference, causes result of the test very undesirable, and result of the test can not truly reflect the performance of actual fretting fatigue.Based on general fine motion
Fatigue test loading device less stable, situations such as imposed load fluctuation is larger.So, in material fretting fatigue testing
When, it is necessary to design a kind of to the sample applying reliable experimental rig of transverse loading stability, so that sample is subject to axial load
And when there is relative slip, transverse load will not change.And micromotion structure, hold-down support etc. in whole process of the test
Structure also can be reliable and stable work.Therefore, design a set of rigidity good, there is the self tuning conditioning function of load while system stabilization
Fretting fatigue transverse direction loading device have great importance.
The content of the invention
In order to overcome existing fretting fatigue testing transverse direction fine motion loading device without the effect of self-coordinating load, stability
The poor deficiency of poor, reliability, the present invention provide it is a kind of have good stability, it is highly reliable, with load self-coordinating effect
Self-coordinating formula fretting fatigue testing transverse direction fine motion loading device.
The technical solution adopted for the present invention to solve the technical problems is：
A kind of self-coordinating formula fretting fatigue testing transverse direction fine motion loading device, including firm banking, the horizontal fine motion add
Carry to put and also include two cantilever beams, two cantilever beams are arranged side by side, and are for placing pipe to be tested in the middle part of two cantilever beams
The experiment station of material, one end fixing bearing of cantilever beam, the bearing is located at a cantilever beam relative to another cantilever beam
Outside, the bearing is installed in rotation in rotating shaft, the rotating shaft be located at firm banking on, two cantilever beams it is another
Install for distance between two cantilever beams of regulation and the load maintainer of fine motion loading at end.
Further, the load maintainer includes spiral loader, load transducer and two connecting screw rods, the connection spiral shell
The middle part of bar passes through a cantilever beam, and the front end of the connecting screw rod is fixedly connected with another cantilever beam, the connection
The rear end of screw rod is fixedly connected with screw rod connecting plate, and the spiral loader is arranged on the screw rod connecting plate, described one
The outside installed load sensor of cantilever beam, actuating strut and the load transducer of the spiral loader coordinate.
Further, the rear end of the connecting screw rod is passed through the connecting hole of screw rod connecting plate and is connected by fixing nut,
The front end of the connecting screw rod is connected through another connecting hole of cantilever beam and by fixing nut.
Further, the opposite face at the middle part of two cantilever beams installs fine motion pad, is described between two fine motion pads
Experiment station.
Transverse slider is installed, the transverse slider laterally slidably can be arranged on cross slide way, described in the rotating shaft
The two ends of cross slide way can slide up and down on column, and the lower end of the column is longitudinally slidably sleeved on longitudinal cunning
On rail, the longitudinal slide rail is fixedly mounted on the firm banking.
Technology design of the invention is：Declined the horizontal loading device of dynamic loading with self-coordinating is provided, be firm banking,
Three-axis moving mechanism, the cantilever beam structure with bearing, fine motion pad fixing device, fine motion load maintainer collective effect to try fine motion
Sample provides transverse load.Firm banking is secured by bolts on testing machine first.Secondly, arrangement three-axis moving mechanism：
Cross sliding clock structure is installed on the side of firm banking, two pairs of distances of sliding block are adjusted so that two axles of slide block structure
The distance between be the outside dimension of designed fretting fatigue sample.By the cantilever beam structure with bearing loaded on slide block structure it
On, bearing is placed on sliding block axle upper end.Described bearing is gap cooperation with axle, and possesses the locking screw for carrying on bearing
Nail；After cantilever beam adjusts height according to testing machine and test sample, it is fixed by the lock-screw on bearing.Again,
By fine motion pad by bolt installation and the middle of cantilever beam, sample is by the upper and lower grips of testing machine and by described one
To fine motion pad.Finally, fine motion loading system is fixed on the free end of cantilever beam by screw rod, such that it is able to apply stabilization, can
The transverse load leaned on.The load value of applying can be shown by the supporting display table of load transducer.Now, it is whole micro-
Dynamic device will keep geo-stationary with testing machine.During fretting fatigue testing, static inching gear and axial inching
Sample exist slide, so as to reach the effect of fretting fatigue.
The effect of patent of the present invention is mainly manifested in：Device has tri- adjustable performances in direction of XYZ, can be according to different examinations
Sample different size carrys out adjustment position.Whole cantilever beam has the principle of the lever of enlarging function so that the load at fine motion is certainly
By 2 times of end imposed load.The spiral force application apparatus of free end have the function of positioning and bit shift compensation, therefore can allow two boards
Initial position is kept, so that ensure that load is constant, therefore device has the effect of self-coordinating.The fine motion loading dress of free end
Put and improved and obtained by micrometer caliper so that loaded load also has precision 0.1N very high.Due to whole device use shape material,
The larger whole device rigidity of cantilever beam structure size is very well.Apparatus of the present invention simple structure, easy to operate, rational in infrastructure, connection
It is reliable that reliable and stable during fretting test, load self-coordinating is carried out to fine motion sample.
Brief description of the drawings
Fig. 1 is the schematic diagram of self-coordinating formula fretting fatigue testing transverse direction fine motion loading device.
Fig. 2 is the top view of Fig. 1.
The schematic diagram of Tu3Shi three-axis movings mechanism.
Fig. 4 is the schematic diagram of the transverse slider of tape spool.
Fig. 5 is the schematic diagram of cantilever beam.
Fig. 6 is the schematic diagram of fine motion pad fixing device.
Fig. 7 is the schematic diagram of spiral load maintainer.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings.
1~Fig. 7 of reference picture, a kind of self-coordinating formula fretting fatigue testing transverse direction fine motion load charger, including fixed bottom
Seat 1, the horizontal fine motion loading device also includes two cantilever beams 3, and two cantilever beams 3 are arranged side by side, in two cantilever beams 3
Portion is the experiment station for placing tubing to be tested 6, and one end fixing bearing of cantilever beam 3, the bearing is located at a cantilever
Beam is installed in rotation in rotating shaft relative to another outside of cantilever beam, the bearing, and the rotating shaft is located at firm banking
On, the other end of two cantilever beams 3 is installed for distance between two cantilever beams of regulation and the load maintainer of fine motion loading
5。
Further, the load maintainer includes spiral loader 51, load transducer 52 and two connecting screw rods 53, described
The middle part of connecting screw rod 53 passes through a cantilever beam, and the front end of the connecting screw rod 53 is fixed with another cantilever beam and connected
Connect, the rear end of the connecting screw rod 53 is fixedly connected with screw rod connecting plate 54, the spiral loader 51 is arranged on the screw rod
On connecting plate 54, the outside installed load sensor 52 of a cantilever beam, the actuating strut of the spiral loader 51 and institute
Load transducer 52 is stated to coordinate.
Further, the rear end of the connecting screw rod 53 is passed through the connecting hole of screw rod connecting plate and is connected by fixing nut
Connect, the front end of the connecting screw rod 53 is connected through another connecting hole of cantilever beam and by fixing nut.
Further, the opposite face at the middle part of two cantilever beams 3 installs fine motion pad 4, is institute between two fine motion pads 4
State experiment station.
Transverse slider 2 is installed, the transverse slider 2 laterally slidably can be arranged on cross slide way, institute in the rotating shaft
The two ends for stating cross slide way can slide up and down on column, and the lower end of the column is longitudinally slidably sleeved on longitudinal direction
On slide rail, the longitudinal slide rail is fixedly mounted on the firm banking 1.
Three-axis moving mechanism is of an L-shaped structure, and is formed by connecting with angle bar by section bar, and it is respectively provided with along tri- directions of XYZ
Guide groove；The firm banking 1 is fixed with testing machine, and its positive two crossbeam is substantially parallel, the sliding block knot for connecting tape spool
Structure, two crossbeams can be moved along the upper and lower Z-direction of base, the framework knot that at the same time adjacent two crossbeams are constituted with vertical guide groove
Structure can be moved along front and rear Y-direction.The transverse slider 2 with rotating shaft is shown in there is screw on Fig. 4 sliding blocks in detail, and axle sleeve enters horizontal cunning
Lock by lock-screw that composition is overall after block, the transverse slider structure of described 1 pair of tape spool with can transversely X-direction horizontal stroke
Direction guiding rail is slided, and fastening bolt is carried on cross slide way, behind the position for adjusting X-direction, can be made transverse slider and be led
Groove is fixed.The cantilever beam 3 with bearing is shown in Fig. 5, and screwed hole of the beam end then according to bearing block is corresponding to be provided with 4 holes, often
All vertically edge is arranged symmetrically two bearings with bearing block for one end of block beam, tells that bearing passes through bolt and cantilever beam phase
Connection；The cantilever beam is tightened together with bearing by bolts and nuts；There is fixed fine motion the middle part of the cantilever beam
Two screwed holes of pad 4, two center lines of the screwed hole on beam are arranged symmetrically.The free end of the cantilever beam 3 has for pacifying
Midpoint and the cantilever beam for having two holes, described two holes on the hole of dress load charger and every block of cantilever beam are fixed in end bearing
The heart is on the Central Symmetry of fine motion pad 4.Fine motion pad fixture structure see Fig. 6 its fine motion pad 4 is fixed on by bolt mainly it is outstanding
On arm beam 3, fine motion pad is located at the middle of cantilever beam, and a pair of fine motion pads are respectively symmetrically and are arranged on two blocks of cantilever beams, and fine motion
Pad is in contact with fretting fatigue sample.The fine motion load maintainer is shown in Fig. 7, by spiral loader, load transducer and two companies
The composition such as screw rod is connect, described device is connected by screw rod with two pieces of beams, and is fixed by nut with one of beam, and another
Outer one piece of beam keeps free state；The load transducer is secured by bolts in and is on the beam of free state with screw rod, and
And ensure the center that its fixed position is two screw rods；There is screwed hole to be connected with screw rod by nut on the spiral loader
Connect, it is possible to interfix.The loading head of the spiral loader is in sustained height with pressure sensor.
By the sliding block of bearing and tape spool to even, its beam can freely be rotated the cantilever beam 3 around axle, but its vertical side
The limitation of trip bolt that upward displacement is carried by bearing, and the distance between two axles are specimen size and two fine motion pad chis
Very little sum.
The distance between the fine motion loading structure, two screw rods are the distance between the holes of spiral loader, two spiral shells
Inside and outside bar and one of plate plus nut is fixed, one piece of the two of beam hole should be slightly larger than the diameter of screw rod in addition.
So that when screw rod passes through beam, will not be rubbed with beam hole.
Described device is loaded by spiral loader compression sensor, and the registration of load transducer is by its supporting display
Table reads, and the fine motion load at fine motion pad is then the twice of display meter reading, i.e. imposed load acts on cantilever beam free end
So that the transverse load at fine motion pad is the twice of free end imposed load, this cantilever beam has leverage simultaneously.
After reference picture 1 is completed with Fig. 2 in specific experiment, it is fixed on together with sample on grip of testing machine and is tried
Test.
The device of the present embodiment has tri- adjustable performances in direction of XYZ, can be adjusted according to various sample different size
Position.The effect of moment of flexure is not subject to because the free other end in cantilever beam one end of device connects it by bearing, therefore works as sample
When at fine motion, whole cantilever beam has the principle of lever so that the load at fine motion is 2 times of free end imposed load.
Because fatigue testing specimen is to apply fine motion load by two pieces of good beams clampings of rigidity.Therefore, when micro- in process of the test
When dynamic loading changes, because therefore the function that the spiral loading device of free end has positioning and bit shift compensation can allow two pieces
Plate keeps initial location status.So as to ensure that load is constant, therefore the effect with self-coordinating.The fine motion of other free end adds
Carry to put and improved and obtained by micrometer caliper, compression sensor is rotationally advancing with it to obtain corresponding load.Because spiral is surveyed
The high accuracy (0.0001mm) of micro- device is so that loaded load also has precision 0.1N very high.
Claims (4)
1. a kind of self-coordinating formula fretting fatigue testing transverse direction fine motion loading device, including firm banking, it is characterised in that：The horizontal stroke
Also include two cantilever beams to fine motion loading device, two cantilever beams are arranged side by side, and are for placing in the middle part of two cantilever beams
The experiment station of tubing to be tested, one end fixing bearing of cantilever beam, the bearing is located at a cantilever beam relative to another
The outside of cantilever beam, the bearing is installed in rotation in rotating shaft, and the rotating shaft is located on firm banking, two cantilevers
The other end of beam is installed for distance between two cantilever beams of regulation and the load maintainer of fine motion loading；The load maintainer includes
Spiral loader, load transducer and two connecting screw rods, the middle part of the connecting screw rod pass through a cantilever beam, described
The front end of connecting screw rod is fixedly connected with another cantilever beam, and the rear end of the connecting screw rod is fixedly connected with screw rod connecting plate,
The spiral loader is arranged on the screw rod connecting plate, and the outside installed load sensor of a cantilever beam is described
The actuating strut of spiral loader coordinates with the load transducer.
2. self-coordinating formula fretting fatigue testing as claimed in claim 1 transverse direction fine motion loading device, it is characterised in that：The company
The rear end for connecing screw rod is passed through the connecting hole of screw rod connecting plate and is connected by fixing nut, and the front end of the connecting screw rod is through separately
A piece connecting hole for cantilever beam is simultaneously connected by fixing nut.
3. self-coordinating formula fretting fatigue testing as claimed in claim 1 or 2 transverse direction fine motion loading device, it is characterised in that：Institute
State two opposite faces at the middle part of cantilever beam and fine motion pad is installed, be the experiment station between two fine motion pads.
4. self-coordinating formula fretting fatigue testing as claimed in claim 1 or 2 transverse direction fine motion loading device, it is characterised in that：Institute
State and transverse slider is installed in rotating shaft, the transverse slider laterally slidably can be arranged on cross slide way, the cross slide way
Two ends can slide up and down on column, and the lower end of the column is longitudinally slidably sleeved in longitudinal slide rail, described
Longitudinal slide rail is fixedly mounted on the firm banking.
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| CN201510243706.5A CN104880362B (en) | 2015-05-13 | 2015-05-13 | Self-coordinating formula fretting fatigue testing transverse direction fine motion loading device |
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| CN104880362B true CN104880362B (en) | 2017-06-20 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105510118B (en) * | 2015-12-31 | 2018-07-06 | 浙江工业大学 | Symmetrical line contacts fretting fatigue testing fine motion load charger |
| CN108931426B (en) * | 2018-05-31 | 2021-03-02 | 西北工业大学 | Fretting fatigue loading device and fretting fatigue testing device |
| CN108693038B (en) * | 2018-07-24 | 2023-07-14 | 鞍山星源达科技有限公司 | Automatic load loading device and method for metallurgical or coked material performance measurement experiment |
| CN109900556B (en) * | 2019-04-12 | 2021-10-15 | 中北大学 | Self-coordination type micro-motion fatigue test transverse micro-motion loading device |
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Effective date of registration: 20201021 Address after: 214500, Dajue village committee, Xieqiao Town, Jingjiang City, Taizhou City, Jiangsu Province Patentee after: Jiangsu JiuHeng lifting equipment Co., Ltd Address before: The city Zhaohui six districts Chao Wang Road Hangzhou city Zhejiang province Zhejiang University of Technology No. 18 310014 Patentee before: ZHEJIANG University OF TECHNOLOGY |
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