CN104596695B - Loading device for accurately controlling rivet preload of riveting member - Google Patents
Loading device for accurately controlling rivet preload of riveting member Download PDFInfo
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- CN104596695B CN104596695B CN201510041283.9A CN201510041283A CN104596695B CN 104596695 B CN104596695 B CN 104596695B CN 201510041283 A CN201510041283 A CN 201510041283A CN 104596695 B CN104596695 B CN 104596695B
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- pin
- preload
- riveting
- rivet
- bolt
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Abstract
The invention relates to a loading device for accurately controlling rivet preload of a riveting member. The device is composed of a bolt (1), a ring clamp (2), a strain gauge (6) attached to the outside of the ring clamp, a pin (3) and a press block (7). The strain gauge is in the vertical direction. The tightening load of the bolt is applied to the pin (3). A test method includes the steps of pressing the press block (7) by tightening the bolt (1), measuring the strain of the preload exerted by the bolt through a static strain indicator connected to the strain gauge attached to ring clamp (2) and accurately calculating the preload required by a test according to a corresponding preload formula. The loading device for accurately controlling rivet preload of the riveting member is reliable in method principle, uniform in loading force, high in test accuracy, accurate in data recording and result analysis, capable of avoiding negative factors on a riveting fretting fatigue test under the premise of not knowing how much the preload is and especially suitable for the research of the influence of riveting structure preload on the fatigue life.
Description
Technical field
The present invention relates to a kind of test method, the loading of rivet pretightning force in more particularly, to a kind of precise control riveted structure
Device.
Background technology
Fretting fatigue is widely present in various mechanical components, particularly uses rivet, bolt, pin and other interference modes
Connection.Due to have connect reliability, light weight, with low cost the features such as, rivet and be widely used in the connection of structure.And
The fatigue behaviour of riveting component is affected by factors such as riveting process, structure material, external applied loads.In riveting process, riveting
Follow closely the power that presses very big on being riveted structure jogging fatigue rupture impact: the power conference of pressing leads to rivet pretightning force big, fretting fatigue
Crackle can germinate in rivet head edge；The power that presses is little to cause rivet pretightning force little, and fretting fatigue cracks can be in rivet bore edges
Germinating.Therefore, the pretightning force controlling riveting fretting fatigue testing is just particularly important.
The method having several riveting fretting fatigue testings at present, the most frequently used having simulates riveting by bolt reasonable in design
The test method that connects, there is test method directly being pressed etc. by rivet.But said method all cannot effectively be surveyed
The pretightning force of amount riveting fretting fatigue testing.The side of riveting fretting fatigue testing is such as simulated using bolt reasonable in design
Method, although the method can record pretightning force by way of wrench torque, is as the continuous of test load and number of times
It is impossible to timely understand and grasp the pretightning force of riveting fretting fatigue testing, this can produce very big to the result of test for change
Change, thus accurately test data and result cannot be obtained；And the test method directly being pressed by rivet is to riveting
Nail can produce very big plastic deformation during being pressed, thus the accurate pretightning force of test cannot be learnt.Therefore, design
The charger of one precise control rivet pretightning force is very necessary.
Content of the invention
It is an object of the invention to provide in a kind of precise control riveted structure rivet pretightning force charger, the method is
The method being simulated riveting fretting fatigue testing based on pin is improved.
A kind of charger of precise control rivet pretightning force of the present invention, including by bolt 1 and annulus fixture 2 and patch
Foil gauge 6 outside in annulus fixture forms, and foil gauge is vertical direction, and upper lower wall bolt can be tightened, and applies pressure to press
Block 7, thus imposed load acts on pin 3.
The invention has the beneficial effects as follows, there is provided a kind of test method of measurement riveting fretting fatigue testing pretightning force, can
With the effective pretightning force controlling riveting seam, it is to avoid made appearance position at riveting due to affecting by pretightning force
Put uncertain crackle.This test method principle is reliable, and uniformly, test accuracy is high for loading force, record data and analysis number
According to accurate, significant for research riveting fatigue life under the influence of by pretightning force for the fretting test.
Brief description
Fig. 1 is the front view of the assay device of measurement riveting fretting fatigue testing test specimen pretightning force in the present invention.Riveting examination
Part is linked together by pin 3 by upper plate 4 and lower plate 5.Riveting test specimen is placed on the centre of annulus fixture 2, by two
Bolt 1 and briquetting 7 are stepped up along pin 3 axis up and down to test specimen.Annulus fixture posts foil gauge 6 on lateral wall.
Fig. 2 is the left view of the assay device measuring riveting parts fretting fatigue testing pretightning force in the present invention.
Fig. 3 is the 1/4 structure stress schematic diagram loading annulus fixture 2 in the present invention.Wherein,r 1It is the interior of annulus fixture 2
Footpath,r 3It is the external diameter of annulus fixture 2,r 2It is the neutral radius of circle of annulus fixture 2,pFor maximum perpendicular load in process of the test,
Interface at the point s of inner side is a-a, and m is the moment of flexure at the point s of inner side.
Specific embodiment
This device includes an annulus fixture 2 and two bolts 1 on the same axis.Bolt 1 end will apply to briquetting 7
Contact load, uniformly, design bolt end is hemispherical to the applied contact pressure of briquetting 7 to be made.Hemispherical end during imposed load
Portion is contacted with briquetting 7 upper surface center, equal with the contact pressure that ensures briquetting 7 two ends.
During installation, first briquetting 7 is lain in a horizontal plane in upper plate 4, lower plate 5 and pin 3 contact position, make the centrage of bolt 1
With the centrage of pin 3 on same straight line, so can ensure that the two ends being applied to briquetting of uniform load, then tighten
Bolt 1 at annulus fixture 2 two ends.The rivet after pressing simulated jointly by pin 3 and briquetting 7.Annulus fixture 2 two ends will be attached to
Foil gauge 6 is connected with statical strain indicator by wire, observes the numerical value above deformeter by adjustment bolt 1, according to corresponding
Formula calculate the thrust that test is applied, its computational methods is as follows:
As shown in figure 3, the maximum stress formula producing at the point s of inner side is:
In formula: σmaxFor moment of flexuremStress (mpa) produced by the point s of inner side, σpFor pulling forcepN () is produced
Stress (mpa),eElasticity modulus of materials (mpa) for annulus fixture 2, ε is the strain value that in test, foil gauge 6 records.Its
In, σpAnd σmaxIt is represented by
In formula:pFor maximum perpendicular load (n) in process of the test,h= r3- r1,bAxial width for annulus fixture 2
(mm), moment of flexuremObtained by following formula:
Claims (4)
1. in a kind of precise control riveted structure rivet pretightning force charger it is characterised in that riveting test specimen be by upper plate
(4) linked together by pin (3) with lower plate (5), riveting test specimen passes through the centre of annulus fixture (2), by two bolts
(1) along pin (3) axis, test specimen is clamped up and down with briquetting (7), annulus fixture (2) lateral wall is posted foil gauge (6),
Thus by the strain measuring annulus fixture (2), indirectly obtaining riveting the pretightning force of test specimen.
2. in a kind of precise control riveted structure according to claim 1 rivet pretightning force charger, its feature exists
In the upper lower wall of annulus fixture (2), one bolt (1) is radially respectively installed, pin (3) and briquetting can be compressed by tightening bolt
(7), and foil gauge (6) is posted on the wall of side, thrust can indirectly be obtained by measuring side wall strain.
3. in a kind of precise control riveted structure according to claim 1 rivet pretightning force charger, its feature exists
It is t type cylindrical pin in pin (3), and is enclosed within the briquetting (7) of other one of pin (3) to collectively constitute simulation rivet arrangement.
4. in a kind of precise control riveted structure according to claim 1 rivet pretightning force charger, its feature exists
It is columnar structured in briquetting (7), in it, the depth of cylindrical hole stretches out the length of test specimen more than pin (3) end, makes briquetting (7)
The end of endoporus bottom and pin (3) leave certain space it is ensured that during compression stem knob not hindered.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510041283.9A CN104596695B (en) | 2015-01-28 | 2015-01-28 | Loading device for accurately controlling rivet preload of riveting member |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510041283.9A CN104596695B (en) | 2015-01-28 | 2015-01-28 | Loading device for accurately controlling rivet preload of riveting member |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104596695A CN104596695A (en) | 2015-05-06 |
| CN104596695B true CN104596695B (en) | 2017-01-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510041283.9A Expired - Fee Related CN104596695B (en) | 2015-01-28 | 2015-01-28 | Loading device for accurately controlling rivet preload of riveting member |
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| CN (1) | CN104596695B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109443920A (en) * | 2018-12-03 | 2019-03-08 | 中国电子产品可靠性与环境试验研究所（（工业和信息化部电子第五研究所）（中国赛宝实验室）） | Environment-pulling force coupling test devices, systems, and methods |
| CN111650063A (en) * | 2020-07-02 | 2020-09-11 | 天津科技大学 | Normal load loading device based on single-shaft fatigue testing machine |
| CN111999172B (en) * | 2020-08-31 | 2021-10-26 | 中国商用飞机有限责任公司 | Test fixture, device and method for rivet composite loading test |
| CN113478214A (en) * | 2021-07-13 | 2021-10-08 | 大连理工大学 | Small-size bolt pre-tightening process and device based on axial pre-load |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE427308B (en) * | 1982-04-28 | 1983-03-21 | Giuseppe Milazzo | Method and arrangement for measuring the mechanical stress in a rivet holding together at least two parts |
| FR2669734B1 (en) * | 1990-11-29 | 1994-09-23 | Schlumberger Cie Dowell | PRESSURE SENSOR WITH STRAIN GAUGE FOR ADAPTATION TO THE EXTREME COLLAR OF A PIPING OR TUBING AND MOUNTING ASSEMBLY USING THE SAME. |
| CN1808085A (en) * | 2005-12-13 | 2006-07-26 | 上海冠华科技有限公司 | Fastener pull-out force detector |
| JP5163773B2 (en) * | 2011-05-12 | 2013-03-13 | 日産自動車株式会社 | Quality control method and quality control gauge and quality control gauge set for screw parts |
| CN102879137A (en) * | 2012-10-10 | 2013-01-16 | 北京理工大学 | Flexible fixing device for residual stress detection |
| CN203178010U (en) * | 2013-01-24 | 2013-09-04 | 贵州航天精工制造有限公司 | Efficient testing machine for detecting test pretightening force |
| CN203171433U (en) * | 2013-03-21 | 2013-09-04 | 无锡市利钧轴承有限公司 | Clamp for grinding small outer circle of eccentric sleeve |
| CN104019968B (en) * | 2014-05-20 | 2016-06-15 | 北京航空航天大学 | A kind of pilot system testing screw blade fatigue property |
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2015
- 2015-01-28 CN CN201510041283.9A patent/CN104596695B/en not_active Expired - Fee Related
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| CN104596695A (en) | 2015-05-06 |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170125 Termination date: 20180128 |