CN104596695A - 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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- CN104596695A CN104596695A CN201510041283.9A CN201510041283A CN104596695A CN 104596695 A CN104596695 A CN 104596695A CN 201510041283 A CN201510041283 A CN 201510041283A CN 104596695 A CN104596695 A CN 104596695A
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- briquetting
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- rivet
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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, particularly relate to the charger of rivet pretightning force in a kind of accurate control riveted structure.
Background technology
Fretting fatigue is extensively present in various mechanical component, connecting particularly by rivet, bolt, pin and other interference modes.Connect the features such as reliable, quality is light, with low cost owing to having, riveted joint is widely used in the connection of structure.And rivet the impact of fatigue behaviour by factors such as riveting process, structure material, external applied loads of component.In riveting process, rivet presses power to very large by riveted structure fretting fatigue destroying infection: the power conference of pressing causes rivet pretightning force large, and fretting fatigue cracks can be germinated at manufactured head edge; The little meeting of the power that presses causes rivet pretightning force little, and fretting fatigue cracks can be germinated at rivet hole edge.Therefore, the pretightning force controlling riveted joint fretting fatigue testing just seems particularly important.
Have the method for several riveted joint fretting fatigue testing at present, the most frequently used have by bolt reasonable in design simulate riveted joint test method, have and directly carry out test method pressed etc. by rivet.But said method all effectively cannot measure the pretightning force of riveted joint fretting fatigue testing.Such as utilize bolt reasonable in design to simulate the method for riveted joint fretting fatigue testing, although the method can record pretightning force by the mode of wrench torque, but along with the continuous change of test load and number of times, the pretightning force of riveted joint fretting fatigue testing can not be understood and grasped timely, this can produce very large change to the result of test, thus cannot obtain accurately test figure and result; And the test method of directly being undertaken pressing by rivet can produce very large plastic deformation in the process pressed to rivet, thus cannot learn and test pretightning force accurately.Therefore, it is very necessary for designing a charger accurately controlling rivet pretightning force.
Summary of the invention
The object of this invention is to provide the charger of rivet pretightning force in a kind of accurate control riveted structure, the method improves the method simulating riveted joint fretting fatigue testing based on pin.
The charger of a kind of accurate control rivet pretightning force of the present invention, comprise and being made up of bolt 1 and annulus fixture 2 and the foil gauge 6 that is attached to annulus fixture outside, foil gauge is vertical direction, and upper lower wall bolt can be tightened, pressure is put on briquetting 7, thus imposed load acts on pin 3.
The invention has the beneficial effects as follows, provide a kind of test method measuring riveted joint fretting fatigue testing pretightning force, effectively can control the pretightning force of riveting interface, avoid due to the impact by pretightning force and make riveting place occur the uncertain crackle in position.This test method principle is reliable, and loading force is even, and test accuracy is high, and record data are accurate with analysis data, significant for the fatigue lifetime under the impact being subject to pretightning force for research riveted joint fretting test.
Accompanying drawing explanation
Fig. 1 is the front view of the test unit measuring riveted joint fretting fatigue testing test specimen pretightning force in the present invention.Riveted joint test specimen is linked together by pin 3 by plate 4 and plate 5.Riveted joint test specimen is placed on the centre of annulus fixture 2, is stepped up up and down along pin 3 axis by two bolts 1 and briquetting 7 to test specimen.Annulus fixture lateral wall posts foil gauge 6.
Fig. 2 is the left view of the test unit 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
the internal diameter of annulus fixture 2,
the external diameter of annulus fixture 2,
the neutral radius of circle of annulus fixture 2,
pfor maximum perpendicular load in process of the test, the moment of flexure that to be A-A, M at the interface at some S place, inner side be at some S place, inner side.
Embodiment
This device comprises an annulus fixture 2 and two bolts 1 on the same axis.Bolt 1 end apply contact load will to briquetting 7, make briquetting 7 applies contact evenly, design bolt end is semisphere.During imposed load, domed ends contacts with briquetting 7 upper surface center, equal to ensure the contact at briquetting 7 two ends.
During installation, first briquetting 7 is lain in a horizontal plane in two plates and pin 3 contact position, make the center line of the center line of bolt 1 and pin 3 on same straight line, the two ends being applied to briquetting of uniform load can be ensured like this, be then tightened in the bolt 1 at annulus fixture 2 two ends.The rivet after pressing simulated jointly by pin 3 and briquetting 7.Be connected with statical strain indicator by wire by the foil gauge 6 being attached to annulus fixture 2 two ends, observe the numerical value above strainmeter by adjustment bolt 1, go out to test the snap-in force applied according to corresponding formulae discovery, its computing method are as follows:
As shown in Figure 3, the maximum stress formula that some S place in inner side produces is:
In formula:
for moment of flexure
mat the stress (MPa) that some S place, inner side produces,
for pulling force
p(N) stress (MPa) produced,
efor the elasticity modulus of materials (MPa) of annulus fixture 2,
for the strain value that foil gauge 6 in test records.
Wherein,
In formula:
pfor maximum perpendicular load (N) in process of the test,
h=
-
,
with
be respectively internal diameter (mm) and the external diameter (mm) of annulus fixture 2,
bfor the axial width (mm) of annulus fixture 2, moment of flexure
mobtained by following formula:
In formula,
for the neutral radius of a circle of annulus fixture 2 (mm).
Claims (4)
1. one kind accurately controls the charger of rivet pretightning force in riveted structure, it is characterized in that riveted joint test specimen is linked together by pin 3 by plate 4 and plate 5, riveted joint test specimen is through the centre of annulus fixture 2, test specimen is stepped up up and down along pin 3 axis by two bolts 1 and briquetting 7, annulus fixture 2 lateral wall posts foil gauge 6, thus by measuring the strain of annulus fixture 2, indirectly obtain the pretightning force of riveting test specimen.
2. annulus fixture 2 according to claim 1, it is characterized in that on annulus fixture 2, lower wall is radially respectively provided with a bolt 1, pin 3 and briquetting 7 can being compressed by tighting a bolt, and on sidewall, post foil gauge 6, indirectly obtaining snap-in force by measuring sidewall strain.
3. pin 3 according to claim 1, is characterized in that pin 3 is T-shaped cylindrical pins, and is enclosed within the briquetting 7 composition simulation rivet arrangement jointly of other one of pin 3.
4. briquetting 7 according to claim 1, it is characterized in that briquetting 7 is columnar structured, in it, the degree of depth of cylindrical hole is greater than the length that pin 1 end stretches out test specimen, makes to leave certain space with the end of pin 1 bottom briquetting 7 endoporus, and when ensureing to compress, stem knob is 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 true CN104596695A (en) | 2015-05-06 |
| CN104596695B CN104596695B (en) | 2017-01-25 |
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| 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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Cited By (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 |
| CN111999172A (en) * | 2020-08-31 | 2020-11-27 | 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 |
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| 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 |
| EP0488446A1 (en) * | 1990-11-29 | 1992-06-03 | Sofitech N.V. | Pressure transducer with strain gauge for fitting on the end flange of a pipeline or of a casing and assembly unit implementing same |
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| WO2012153558A1 (en) * | 2011-05-12 | 2012-11-15 | 日産自動車株式会社 | Quality management method, quality management gauge, and gauge set for screw axis-shaped component |
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| 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 |
| CN104019968A (en) * | 2014-05-20 | 2014-09-03 | 北京航空航天大学 | Testing system for testing fatigue performance of propeller blades |
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2015
- 2015-01-28 CN CN201510041283.9A patent/CN104596695B/en not_active Expired - Fee Related
Patent Citations (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 |
| EP0488446A1 (en) * | 1990-11-29 | 1992-06-03 | Sofitech N.V. | Pressure transducer with strain gauge for fitting on the end flange of a pipeline or of a casing and assembly unit implementing same |
| CN1808085A (en) * | 2005-12-13 | 2006-07-26 | 上海冠华科技有限公司 | Fastener pull-out force detector |
| WO2012153558A1 (en) * | 2011-05-12 | 2012-11-15 | 日産自動車株式会社 | Quality management method, quality management gauge, and gauge set for screw axis-shaped component |
| 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 |
| CN104019968A (en) * | 2014-05-20 | 2014-09-03 | 北京航空航天大学 | Testing system for testing fatigue performance of propeller blades |
Cited By (5)
| 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 |
| CN111999172A (en) * | 2020-08-31 | 2020-11-27 | 中国商用飞机有限责任公司 | Test fixture, device and method for rivet composite loading test |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104596695B (en) | 2017-01-25 |
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