CN104568619A - Normal loading device of fretting fatigue test system - Google Patents
Normal loading device of fretting fatigue test system Download PDFInfo
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- CN104568619A CN104568619A CN201410814537.1A CN201410814537A CN104568619A CN 104568619 A CN104568619 A CN 104568619A CN 201410814537 A CN201410814537 A CN 201410814537A CN 104568619 A CN104568619 A CN 104568619A
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Abstract
The invention discloses a normal loading device of a fretting fatigue test system. The device adopts the scheme that a base is fixed on the table board of a tension torsion multi-axial fatigue tester through a thread; two transverse guide rails are fixed on the base; a nut of a lead screw is mounted at the right end of the base; a screw of the lead screw is connected with a right baffle plate of a clamping mechanism; the clamping mechanism is characterized in that a sliding block on the bottom surface of a bottom plate is matched with the guide rails on the base; a left baffle plate and a right baffle plate connected through four guide rods are fixed at the left and right ends of the bottom plate; a pressure sensor which is opposite to a pressure head of the right baffle plate is mounted in a groove on the right side of a right chuck; a right inching pad is arranged in an arc-shaped groove of the right chuck; an air cylinder is fixed on the left side of the left baffle plate; a piston rod of the air cylinder penetrates through the left baffle plate to be connected with a buffer block; the right side surface of the buffer block is opposite to the left side surface of a movement plate; the right side of the movement plate is connected with a left chuck through a three-dimensional sensor; a left inching pad is arranged in an arc-shaped groove of the left chuck. The normal load loaded by the test deice can preferably keep constant and the test result is more correct and reliable.
Description
Technical field
The present invention relates to the test unit of the fretting fatigue of mechanical engineering field.
Background technology
Fine motion (fretting) refers under the alternate load effects such as mechanical vibration, fatigue load, electric and magnetic oscillation or thermal cycle, nominally the relative motion (displacement amplitude is generally micron dimension) that the amplitude that between static parts surface in contact, (as wringing fit face) occurs is minimum, namely fine motion occurs in the mechanical part that " fastening " coordinate.
Fretting fatigue refers to the distortion that surface in contact causes because of fine motion and the fatigue produced.Fretting fatigue phenomenon mainly occurs in the multiple counterpart of interference fit: as the press fit of locomotive rolling stock wheel shaft, various retention mechanism and clamping device.These fatigue phenomenons can adopt horizontal cylinder (fine motion pad)/vertical cylinder (sample)/horizontal cylinder (fine motion pad) contact model to carry out short form test research (simulating two extruded threads relative on sample in interference fit with two contact points of sample with the fine motion pad of both sides).For horizontal cylinder/vertical cylinder/horizontal cylinder contact model, its fretting fatigue testing has three kinds of basic models, that is: tension and compression fine motion (vertical fine motion occurs sample) is tired, twisting or micro-moving (sample rotate fine motion) tired and bending fretting fatigue (fine motion of sample occurred level).
In fretting fatigue testing, level (normal direction) load is applied to both sides fine motion pad at present, the mode of press fit (wringing fit) is kept to have two kinds to make both sides fine motion pad and sample: 1) by rotating load screw, promote fine motion pad to make it and sample contacts, and reach the normal load of setting; 2) produce tension force by the nut Compress Spring on rotating guide, promote fine motion pad and make it and sample contacts, and reach the normal load of setting.Its Problems existing is, in process of the test, sample cyclic deformation can occur, and causes fine motion pad to vibrate, and screw thread occurs to loosen, and causes normal load to diminish gradually, is difficult to keep constant normal load, causes that test findings error is large, reliability is low.
Summary of the invention
The object of this invention is to provide a kind of normal direction charger of fretting fatigue testing system, normal direction loading can be carried out to the fretting fatigue of horizontal cylinder/vertical cylinder/horizontal cylinder contact model easily with this test unit, its normal load loaded can better keep constant, and test findings more accurately, reliably; And its automaticity is high.
The present invention realizes the technical scheme that its goal of the invention adopts: a kind of normal direction charger of fretting fatigue testing system, and its design feature is:
Base thread is fixed on the table top of tension-torsion multiaxle fatigue experimental machine, and pedestal upper surface is fixed with the guide rail of two transverse directions, and the right-hand member of pedestal is provided with the nut of leading screw, and the screw rod of leading screw is connected with the right baffle plate of clamping device by ball bearing;
The concrete composition of described clamping device is: the slide block of base plate bottom surface coordinates with the guide rail on pedestal; The left and right end of base plate is fixed with right baffle-plate, right baffle plate respectively; Be connected by four guide rods between right baffle-plate and right baffle plate; Right chuck is sleeved on four guide rods by linear bearing, is provided with pressure transducer in the groove on the right side of right chuck; Pressure transducer is relative with the pressure head on right baffle plate; Right fine motion pad is placed in the deep-slotted chip breaker of right chuck left part; Cylinder is fixed on the left side of right baffle-plate, and the piston rod of cylinder is connected with buffer stopper through right baffle-plate, and the right flank of buffer stopper is relative with the left surface of maneuvering board; Maneuvering board is sleeved on four guide rods by linear bearing, and the right side of maneuvering board is connected with left chuck by three-dimension sensor; Left fine motion pad is placed in the deep-slotted chip breaker of left chuck right part;
Described pressure transducer, cylinder, three-dimension sensor are all electrically connected with data collection and control system.
The operating process of this test unit is:
A, sample lower end is fixed on the chuck of testing machine, by the horizontal shift of leading screw adjustment clamping device, right fine motion pad is just contacted with sample, to cylinder input compressed-air, piston rod moves right and applies normal load by left fine motion pad to sample, the pressure of adjusting cylinders inner plenum, obtains the load value set;
B, to sample upper end apply setting load (Tensile or Compressive Loading, low-angle torsional load, normal direction bending load); In process of the test, the pressure transducer be connected with right chuck measures normal load in real time, feeds back to data collection and control system, and data collection and control system according to this control cylinder makes inner pressure of air cylinder keep constant;
C, in the process of sample and fine motion pad generation relative motion, by the three-dimension sensor Real-Time Monitoring normal force that is connected with left chuck and friction force, and deliver to data collection and control system, data acquisition control system analysis obtains change and the fretting fatigue life-span of component friction factor under different operating mode.
Compared with prior art, the invention has the beneficial effects as follows:
One, in process of the test, the distortion of sample causes the volume change of cylinder interior air chamber very little, and the pressure change of cylinder interior air chamber is very little, thus normal load change is very little; Simultaneously data collection and control system is measured cylinder pressure change by pressure transducer in real time and is carried out FEEDBACK CONTROL to cylinder pressure, ensures that cylinder pressure is constant further.Thus make the normal load suffered by test specimen keep constant, load with the normal direction that this realizes fretting fatigue testing systems constant.Make that test findings error is little, reliability is high.Stretching by the automatic control cylinder piston rod of data collection and control system, automaticity is high, and test repeatability is good.
Two, because right chuck and maneuvering board are connected with four guide rods by linear bearing, ensure that test left and right fine motion pad is on same level line at every turn all the time with this, the phenomenon that when namely there will not be diaxon not overlap, sample bends, thus make fretting fatigue testing have good reappearance.
Further, the cell wall of the deep-slotted chip breaker of above-mentioned left chuck right part has left groove through before and after left, and this left groove is communicated with the left circular hole of left chuck near middle, and left chuck is provided with the left lock-screw through left groove; The cell wall of the deep-slotted chip breaker of described right chuck left part has right groove through before and after to the right, and this right groove is communicated with the right circular hole of right chuck near middle; Right chuck is provided with the right lock-screw through right groove.
Like this, utilize the microdeformation of deep-slotted chip breaker cell wall having groove, cylindrical fine motion pad can be accommodated and accurately locate, also can not crush cylindrical fine motion pad simultaneously.
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Accompanying drawing explanation
Fig. 1 is the structural representation of the test unit of the embodiment of the present invention.
Fig. 2 is the enlarged drawing of local A in Fig. 1.
In figure, the sample of 15 expression fretting fatigue testings.
Embodiment
Embodiment
Fig. 1 Fig. 2 illustrates, a kind of normal direction charger of fretting fatigue testing system, and its design feature is:
Pedestal 1 is screwed on the table top of tension-torsion multiaxle fatigue experimental machine, and pedestal 1 upper surface is fixed with the guide rail 2 of two transverse directions, and the right-hand member of pedestal 1 is provided with the nut 6a of leading screw 6, and the screw rod 6b of leading screw 6 is connected with the right baffle plate 5 of clamping device by ball bearing 7;
The concrete composition of described clamping device is: the slide block 3 of base plate 4 bottom surface coordinates with the guide rail 2 on pedestal 1; The left and right end of base plate 4 is fixed with right baffle-plate 26, right baffle plate 5 respectively; Be connected by four guide rods 25 between right baffle-plate 26 and right baffle plate 5; Right chuck 9 is sleeved on four guide rods 25 by linear bearing 10, is provided with pressure transducer 8 in the groove on the right side of right chuck 9; Pressure transducer 8 is relative with the pressure head 5a on right baffle plate 5; Right fine motion pad 14 is placed in the deep-slotted chip breaker of right chuck 9 left part; Cylinder 27 is fixed on the left side of right baffle-plate 26, and the piston rod 24 of cylinder is connected with buffer stopper 23 through right baffle-plate 26, and the right flank of buffer stopper 23 is relative with the left surface of maneuvering board 22; Maneuvering board 22 is sleeved on four guide rods 25 by linear bearing 10, and the right side of maneuvering board 22 is connected with left chuck 20 by three-dimension sensor 21; Left fine motion pad 16 is placed in the deep-slotted chip breaker of left chuck 20 right part;
Described pressure transducer 8, cylinder 27, three-dimension sensor 21 are all electrically connected with data collection and control system.
In the present embodiment, the cell wall of the deep-slotted chip breaker of described left chuck 20 right part has left groove 18 through before and after left, this left groove 18 is communicated with the left circular hole (19) of left chuck 20 near middle, and left chuck 20 is provided with the left lock-screw 17 through left groove 18; The cell wall of the deep-slotted chip breaker of described right chuck 9 left part has right groove 12 through before and after to the right, and this right groove 12 is communicated with the right circular hole 11 of right chuck 9 near middle; Right chuck 9 is provided with the right lock-screw 13 through right groove 12.
Claims (2)
1. a normal direction charger for fretting fatigue testing system, is characterized in that:
Pedestal (1) is screwed on the table top of tension-torsion multiaxle fatigue experimental machine, pedestal (1) upper surface is fixed with the guide rail (2) of two transverse directions, the right-hand member of pedestal (1) is provided with the nut (6a) of leading screw (6), and the screw rod (6b) of leading screw (6) is connected with the right baffle plate (5) of clamping device by ball bearing (7);
The concrete composition of described clamping device is: the slide block (3) of base plate (4) bottom surface coordinates with the guide rail (2) on pedestal (1); The left and right end of base plate (4) is fixed with right baffle-plate (26), right baffle plate (5) respectively; Be connected by four guide rods (25) between right baffle-plate (26) and right baffle plate (5); Right chuck (9) is sleeved on four guide rods (25) by linear bearing (10), is provided with pressure transducer (8) in the groove on right chuck (9) right side; Pressure transducer (8) is relative with the pressure head (5a) on right baffle plate (5); Right fine motion pad (14) is placed in the deep-slotted chip breaker of right chuck (9) left part; Cylinder (27) is fixed on the left side of right baffle-plate (26), the piston rod (24) of cylinder is connected with buffer stopper (23) through right baffle-plate (26), and the right flank of buffer stopper (23) is relative with the left surface of maneuvering board (22); Maneuvering board (22) is sleeved on four guide rods (25) by linear bearing (10), and the right side of maneuvering board (22) is connected with left chuck (20) by three-dimension sensor (21); Left fine motion pad (16) is placed in the deep-slotted chip breaker of left chuck (20) right part;
Described pressure transducer (8), cylinder (27), three-dimension sensor (21) are all electrically connected with data collection and control system.
2. the normal direction charger of a kind of fretting fatigue testing system according to claim 1, it is characterized in that: the cell wall of the deep-slotted chip breaker of described left chuck (20) right part has left groove (18) through before and after left, this left groove (18) is communicated with the left circular hole (19) of left chuck (20) near middle, and left chuck (20) is provided with the left lock-screw (17) through left groove (18); The cell wall of the deep-slotted chip breaker of described right chuck (9) left part has right groove (12) through before and after to the right, and this right groove (12) is communicated with the right circular hole (11) of right chuck (9) near middle; Right chuck (9) is provided with the right lock-screw (13) through right groove (12).
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| CN201410814537.1A CN104568619B (en) | 2014-12-24 | 2014-12-24 | A kind of normal direction charger of fretting fatigue testing system |
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| CN201410814537.1A CN104568619B (en) | 2014-12-24 | 2014-12-24 | A kind of normal direction charger of fretting fatigue testing system |
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| CN104568619A true CN104568619A (en) | 2015-04-29 |
| CN104568619B CN104568619B (en) | 2017-04-05 |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104931366A (en) * | 2015-06-08 | 2015-09-23 | 天津大学 | Fretting fatigue testing method allowing contact load to be adjusted in real time and testing machine adopting fretting fatigue testing method |
| CN106680068A (en) * | 2016-11-30 | 2017-05-17 | 岭东核电有限公司 | Constant normal force loading device and constant normal force loading method in fretting fatigue test |
| CN107144720A (en) * | 2017-05-11 | 2017-09-08 | 西南交通大学 | High-temperature superconductor band critical current test device and its method of testing under cyclic loading |
| CN108692934A (en) * | 2018-07-16 | 2018-10-23 | 西安航空制动科技有限公司 | A kind of lateral loading device of wheel fatigue test board |
| CN108931426A (en) * | 2018-05-31 | 2018-12-04 | 西北工业大学 | Fretting fatigue loading device and fretting fatigue testing device |
| CN109752258A (en) * | 2019-02-26 | 2019-05-14 | 浙江工业大学 | A kind of fretting fatigue testing normal direction loading device |
| CN110095368A (en) * | 2019-05-09 | 2019-08-06 | 燕山大学 | Lower interference fit face fretting damage test device is acted on for bending connected load |
| CN110132732A (en) * | 2019-06-27 | 2019-08-16 | 浙江工业大学 | Portable controllable load fretting fatigue testing normal direction loading device |
| CN110132739A (en) * | 2019-05-24 | 2019-08-16 | 北京航空航天大学 | A kind of fretting fatigue testing normal load loading device and method |
| CN110220786A (en) * | 2019-07-04 | 2019-09-10 | 浙江工业大学 | A kind of controllable load normal direction loading device of steady type |
| CN111707434A (en) * | 2020-06-24 | 2020-09-25 | 西南交通大学 | Fretting damage test device for heat transfer pipe and quincunx hole supporting plate and implementation method thereof |
| CN113281200A (en) * | 2021-06-22 | 2021-08-20 | 浙江工业大学 | Manual controllable micro fatigue transverse loading device |
| CN116008071A (en) * | 2022-12-09 | 2023-04-25 | 哈尔滨工业大学（威海） | Normally loaded sheet micro-tensile test device |
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Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104931366B (en) * | 2015-06-08 | 2018-08-31 | 天津大学 | A kind of the fretting fatigue testing method and its testing machine of contact load real-time, tunable |
| CN104931366A (en) * | 2015-06-08 | 2015-09-23 | 天津大学 | Fretting fatigue testing method allowing contact load to be adjusted in real time and testing machine adopting fretting fatigue testing method |
| CN106680068A (en) * | 2016-11-30 | 2017-05-17 | 岭东核电有限公司 | Constant normal force loading device and constant normal force loading method in fretting fatigue test |
| CN107144720A (en) * | 2017-05-11 | 2017-09-08 | 西南交通大学 | High-temperature superconductor band critical current test device and its method of testing under cyclic loading |
| CN107144720B (en) * | 2017-05-11 | 2023-06-13 | 西南交通大学 | Device and method for testing critical current of superconducting strip under cyclic load |
| CN108931426B (en) * | 2018-05-31 | 2021-03-02 | 西北工业大学 | Fretting fatigue loading device and fretting fatigue testing device |
| CN108931426A (en) * | 2018-05-31 | 2018-12-04 | 西北工业大学 | Fretting fatigue loading device and fretting fatigue testing device |
| CN108692934A (en) * | 2018-07-16 | 2018-10-23 | 西安航空制动科技有限公司 | A kind of lateral loading device of wheel fatigue test board |
| CN108692934B (en) * | 2018-07-16 | 2024-02-27 | 西安航空制动科技有限公司 | Lateral loading device of machine wheel fatigue test stand |
| CN109752258A (en) * | 2019-02-26 | 2019-05-14 | 浙江工业大学 | A kind of fretting fatigue testing normal direction loading device |
| CN110095368A (en) * | 2019-05-09 | 2019-08-06 | 燕山大学 | Lower interference fit face fretting damage test device is acted on for bending connected load |
| CN110132739A (en) * | 2019-05-24 | 2019-08-16 | 北京航空航天大学 | A kind of fretting fatigue testing normal load loading device and method |
| CN110132732A (en) * | 2019-06-27 | 2019-08-16 | 浙江工业大学 | Portable controllable load fretting fatigue testing normal direction loading device |
| CN110220786A (en) * | 2019-07-04 | 2019-09-10 | 浙江工业大学 | A kind of controllable load normal direction loading device of steady type |
| CN110220786B (en) * | 2019-07-04 | 2024-06-07 | 浙江工业大学 | Stable controllable load normal loading device |
| CN111707434A (en) * | 2020-06-24 | 2020-09-25 | 西南交通大学 | Fretting damage test device for heat transfer pipe and quincunx hole supporting plate and implementation method thereof |
| CN111707434B (en) * | 2020-06-24 | 2021-07-06 | 西南交通大学 | Fretting damage test device for heat transfer pipe and quincunx hole supporting plate and implementation method thereof |
| CN113281200A (en) * | 2021-06-22 | 2021-08-20 | 浙江工业大学 | Manual controllable micro fatigue transverse loading device |
| CN116008071A (en) * | 2022-12-09 | 2023-04-25 | 哈尔滨工业大学（威海） | Normally loaded sheet micro-tensile test device |
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