CN110160873A - A kind of sheet metal corrugation unstability feature exploring experimental facility and method - Google Patents
A kind of sheet metal corrugation unstability feature exploring experimental facility and method Download PDFInfo
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- CN110160873A CN110160873A CN201910525572.4A CN201910525572A CN110160873A CN 110160873 A CN110160873 A CN 110160873A CN 201910525572 A CN201910525572 A CN 201910525572A CN 110160873 A CN110160873 A CN 110160873A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/04—Chucks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
- G01N2203/0262—Shape of the specimen
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/04—Chucks, fixtures, jaws, holders or anvils
- G01N2203/0423—Chucks, fixtures, jaws, holders or anvils using screws
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- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The present invention discloses a kind of sheet metal corrugation unstability feature exploring experimental facility and method, it is related to sheet metal Technology of Plastic Processing field, left support component and right support component are symmetrically fixed on the two sides of connection component lower end, left support block and left support component are rotatablely connected, right support block and right support component are rotatablely connected, left support block and right support block are from top to bottom obliquely installed inwardly, left fixture is fixed on left support block, right fixture is fixed on right support block, left fixture and right fixture are used to limit the normal direction movement of two sides of sample, preceding constraint plate and rear constraint plate are respectively placed in front side and the rear side of sample, online strain measurement system is used to carry out observation of taking pictures in real time online to more wrinkles that sample corrugation area is formed.Sheet metal corrugation unstability feature exploring experimental facility provided by the invention and method, meet actual boundary condition and can accurately observe the Strain Distribution feature of corrugation unstability, the sample suitable for different shape and size in real time.
Description
Technical field
The present invention relates to sheet metal Technology of Plastic Processing fields, more particularly to a kind of sheet metal corrugation unstability feature
Exploring experimental facility and method.
Background technique
With in the high-end precision assembly industry such as space flight, aviation, automobile and national defense industry part lightweight manufacture become
The factors such as gesture continues to develop, and plate is thinned and intensity improves make pad pasting and constancy reduction during part forming, in turn
Cause sheet metal that corrugation unstability easily occurs in plastic processing.In addition, one in metal thin-wall structural member forming process
Directly with complicated contact and friction boundary condition, therefore non-uniform compression is inevitably generated in thin-walled workpiece and is answered
Power.The wrinkling as caused by compression stress is very common in plastic processing field, in typical drawing and forming engineer testing
Flange wrinkle, thus, corrugation unstability becomes major obstacle and defect during metal sheet forming.Part is in forming process
Once corrugation unstability occurs, the forming quality and precision of processing part are not only influenced, the die surface contacted with test specimen is caused
Abrasion, influences the following process quality of part.Carrying out research to the corrugation unstability in sheet metal is that researcher is actively visited
The problem of begging for.
The corrugation unstability research of sheet metal starts from Physical Experiment research.Currently, the experiment side for studying corrugation unstability
There are many method, can be divided into two classes by its nature: one kind is the special shape designed to simulate the unstability Basic Mechanism of plate
The simple test of sample is tested, such as square plate stretching experiment (YBT), disk is rugosity experiment (disc-wrinkling test), square plate
Rugosity experiment (square-plate wrinkling test) etc..Wherein in academia by widely known and widely used reality
Testing is Yoshida bucking test YBT that Japanese scholars Jitian blueness too (Yoshida) proposes in last century the eighties
(Yoshida Buckling Test), the test cause great sensation, global scholar or confused once proposition, in academia
Yoshida bucking test YBT confusingly is imitated, or improves Yoshida bucking test YBT research corrugation unstability on this basis and asks
Topic.Although this kind of experiment facilitates acquisition experimental data, convenient for establishing corresponding theoretical and numerical simulator, material parameter is discussed
Influence to critical wrinkless, but the finally obtained corrugation pattern of every kind of experiment is all the form of single wrinkle, with sheet forming
Practical Instability wrinkling pattern in experiment has a certain distance.Another kind of is the forming with the typical test specimen of simple geometric shape
(annular plate is tested in experiment, such as Alfred Swift cup experiment (swift cup test), annular slab drawing
Drawingtest) etc.；Although the result of this kind of experiment can be more nearly true corrugation effect, it is limited in that and is not easy to adopt
Collect experimental data, and Instability state and corrugation pattern are not easy to observe.
Existing square plate diagonal stretch experimental provision is needed during the test using double-action drawing machine, this is not for matching
The scientific research personnel of standby such stretching-machine proposes challenge, and due to the use of existing experimental provision is all that opaque material adds
Work forms, lead to not in real time observe sample corrugation Instability, critical wrinkless state also can not accurate surveying, and to rise
The detection method of wrinkle unstability wrinkle is not advanced enough, and the final wrinkle of unstability that can only wrinkle to plate detects, and cannot see in real time
The strain cloud atlas distribution characteristics in corrugation area is surveyed, and can only be visually observed, rugula present in plate corrugation unstability is not suitable for
The case where line.Therefore, a kind of Strain Distribution feature for meeting actual boundary condition and capable of accurately observing corrugation unstability is needed
Experimental provision and method.
Summary of the invention
In order to solve the above technical problems, the present invention provides a kind of sheet metal corrugation unstability feature exploring experimental facility and side
Method meets actual boundary condition and can accurately observe the Strain Distribution feature of corrugation unstability in real time, is suitable for different shape
With the sample of size.
To achieve the above object, the present invention provides following schemes:
The present invention provides a kind of sheet metal corrugation unstability feature exploring experimental facility, including connection component, left support portion
Part, left fixture, right support component, right support block, right fixture, preceding constraint plate, constrains plate and in line strain at left support block afterwards
Measuring system, the left support component and the right support component are symmetrically fixed on the two sides of the connection component lower end, described
Connection component with universal material cupping machine for connecting, and the left support block and the left support component are rotatablely connected, institute
It states right support block and the right support component to be rotatablely connected, the left support block and the right support block are from top to bottom inwardly
It is obliquely installed, the left fixture is fixed on the left support block, and the right fixture is fixed on the right support block, the left side
Fixture and the right fixture are used to limit the normal direction movement of two sides of sample, and plate is constrained before described and the rear constraint is flat
Plate is respectively placed in front side and the rear side of the sample, and plate is constrained before described and the rear constraint plate is detachably connected, and
It is described before constraint plate and it is described after constraint plate between gap it is adjustable, it is described before constraint plate and it is described after constraint plate it is equal
For transparent panel, the online strain measurement system is used to take pictures to more wrinkles progress that sample corrugation area is formed in real time online
Observation.
Preferably, the connection component includes crossbeam, fixed block and connecting stud, the left support component and the right branch
Support part part is symmetrically fixed on the lower end of the crossbeam, and the fixed block is fixed on the middle part of the crossbeam upper end, the connection spiral shell
Male screw is connected to the middle part of the upper end of fixing block, is provided with nut on the connecting stud.
Preferably, the lower end of the left support block is installed under the left support part innerside by the first regulating part
It holds, is provided with the first arcuate socket on the left support component, the second arcuate socket, first arc are provided on the left support block
Shape hole is corresponding with second arc hole site, is equipped with the second adjusting on first arcuate socket and second arcuate socket
Part and third regulating part can be adjusted by adjusting first regulating part, second regulating part and the third regulating part
The tilt angle of the left support block.
Preferably, the left fixture is installed on the side that the left support block is tilted to the right by the first screw.
Preferably, the lower end of the right support block is installed under the right support part innerside by the 4th regulating part
It holds, is provided with third arcuate socket on the right support component, the 4th arcuate socket, the third arc are provided on the right support block
Shape hole is corresponding with the 4th arc hole site, and the 5th adjusting is equipped on the third arcuate socket and the 4th arcuate socket
Part and the 6th regulating part can be adjusted by adjusting the 4th regulating part, the 5th regulating part and the 6th regulating part
The tilt angle of the right support block.
Preferably, the right fixture is installed on the side that the right support block is tilted to the left by the second screw.
Preferably, further include multiple 7th regulating parts, constrained before described on plate and be provided with multiple first through hole, after described
Multiple second through-holes are provided on constraint plate, the first through hole and second through-hole correspond, corresponding described
One the 7th regulating part is installed in first through hole and second through-hole, institute can be adjusted by adjusting the 7th regulating part
Gap before stating between constraint plate and the rear constraint plate.
Preferably, the preceding constraint plate and the rear constraint plate are transparent acrylic plate, are constrained before described flat
Plate is identical with the rear constraint writing board shape, and the preceding constraint plate and the rear plate that constrains are inverted trapezoidal plate.
The present invention also provides a kind of experimental methods of sheet metal corrugation unstability feature exploring experimental facility, including following step
It is rapid:
Step a: the sample of the wedge shape of preparation multiple groups different sizes and shapes, on the surface of each sample first
White dumb light paint is sprayed as priming paint, certain interval of time air-dries to priming paint and then spray on priming paint black matte
Paint, so that forming the black and white speckle of uniform gray level on the specimen surface；
Step b: being connect by the connection component with universal material cupping machine, and the sample is put in the left branch
On bracer and the right support block, and make sample between the left fixture and the right fixture, it will the preceding constraint
Plate is placed in the front side of the left fixture and the right fixture, will it is described after constraint plate be placed in the left fixture and described
The rear side of right fixture, and the preceding constraint plate and the rear constraint plate are connected, so that the sample is located at the preceding constraint
Between plate and the rear constraint plate；
Step c: the two sides of the sample are polished, are polished by the adjusting of lubrication and gap, and removal is prepared because of sample
The scratch left, using lubricating oil to the contact surface of the contact surface of the sample and the left support block and the right support block into
Row lubrication；The tilt angle of the left fixture and the right fixture is adjusted to adapt to the sample of different sizes and shapes；So
The gap between the left fixture and the sample is adjusted afterwards, adjusts the gap between the right fixture and the sample；It adjusts
Before described constraint plate and it is described after gap between constraint plate, make the sample and the preceding constraint plate and it is described after about
There is certain gap between beam plate, is stretched through the bottom end that universal material cupping machine clamps the sample, carry out mould
Corrugation unstability under quasi- typical case's drawing and forming engineer testing；
Step d: corrugation unstability Strain Distribution observation, using the online strain measurement system to sample corrugation area's shape
At more wrinkles take pictures in real time observation online, to obtain the Strain Distribution spy similar to the corrugated regions of flange wrinkle
Sign.
The present invention achieves following technical effect compared with the existing technology:
Sheet metal corrugation unstability feature exploring experimental facility provided by the invention and method, simulate typical drawing and forming
Corrugation unstability under engineer testing (flange wrinkle), can convert different boundary conditions, and meeting sheet metal has complexity
The unstability that wrinkles in the forming process of boundary condition forms more wrinkles；It is transparent that plate and rear constraint plate are constrained before the device
Plate can observe in real time the corrugation area strain field point in corrugation Instability under more wrinkle states using online strain measurement system
Cloth feature, and it is suitable for that there are the corrugation unstability situations of small wrinkle, and then to probe into sheet metal under complicated boundary condition
The instability Mechanism that wrinkles provides experimental basis.Compared with existing square plate diagonal stretch experimental provision, it can reach closer to typical case
The corrugation unstability pattern of drawing and forming engineer testing realizes Tensile or Compressive Loading property down conversion boundary condition and reaches different load roads
Diameter, when experiment, carry out single-ended stretching, without using double-action drawing machine, additionally it is possible to the sample suitable for different shape and size.
Detailed description of the invention
It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings
Obtain other attached drawings.
Fig. 1 is the structural schematic diagram of sheet metal provided by the invention corrugation unstability feature exploring experimental facility；
Fig. 2 be Fig. 1 in A-A to cross-sectional view；
Fig. 3 is the structural schematic diagram of sample in the present invention；
Fig. 4 is the structural schematic diagram of online strain measurement system in the present invention.
Description of symbols: 1, sample；101, wedge-shaped part；102, clamping part；2, left support component；3, the second regulating part；
4, left support block；5, left fixture；6, fixing screws；7, fixed block；8, nut；9, connecting stud；10, crossbeam；11, the second spiral shell
Nail；12, right fixture；13, right support block；14, right support component；15, preceding constraint plate；16, the 7th screw is adjusted；17, the 7th
Adjusting nut；18, plate is constrained afterwards；19, the first arcuate socket；20, the 4th arcuate socket.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The object of the present invention is to provide a kind of sheet metal corrugation unstability feature exploring experimental facility and methods, meet reality
Boundary condition and the Strain Distribution feature that can accurately observe corrugation unstability in real time, the examination suitable for different shape and size
Sample.
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing and specific real
Applying mode, the present invention is described in further detail.
As shown in Figs 1-4, the present embodiment provides a kind of sheet metal corrugation unstability feature exploring experimental facilities, including connection
Component, left support component 2, left support block 4, left fixture 5, right support component 14, right support block 13, right fixture 12, preceding constraint are flat
Plate 15, rear constraint plate 18 and online strain measurement system, left support component 2 and right support component 14 are symmetrically fixed on connection group
The two sides of part lower end, for connecting with universal material cupping machine, left support block 4 and left support component 2 rotate connection component
Connection, right support block 13 and right support component 14 are rotatablely connected, and left support block 4 and right support block 13 from top to bottom inwardly roll
Tiltedly setting, by adjust left support block 4 and right support block 13 tilt angle, allow the device to be suitable for different shape and
The sample 1 of size.Specifically, sample 1 includes wedge-shaped part 101 and the clamping part 102 for being set to 101 bottom end of wedge-shaped part, wherein wedge
Shape portion 101 is deformed area, and the sample 1 in the present embodiment is the half of traditional Yoshida bucking test YBT sample, saves original
Material.Left fixture 5 is fixed on left support block 4, and right fixture 12 is fixed on right support block 13, two sides of wedge-shaped part 101
It is respectively placed on left support block 4 and right support block 13, two sides of sample 1 is limited by left fixture 5 and right fixture 12
Normal direction movement, preceding constraint plate 15 and rear constraint plate 18 are respectively placed in front side and the rear side of sample 1, preceding 15 He of constraint plate
Constraint plate 18 is detachably connected afterwards, and the gap between preceding constraint plate 15 and rear constraint plate 18 is adjustable, left by adjusting
Gap, right fixture 12 between fixture 5 and sample 1 and the gap between sample 1 and preceding constraint plate 15 and after constrain plate
Gap between 18 makes sample 1 of the device suitable for different-thickness.Preceding constraint plate 15 and rear constraint plate 18 are
Isotropic disk, online strain measurement system are used to carry out observation of taking pictures in real time online to more wrinkles that the corrugation of sample 1 area is formed.
Sheet metal corrugation unstability feature exploring experimental facility provided by the invention can simulate typical drawing and forming technique
The corrugation unstability under (flange wrinkle) is tested, different boundary conditions can be converted, meet sheet metal with complex boundary
The unstability that wrinkles in the forming process of condition forms more wrinkles；It is transparent that plate 15 and rear constraint plate 18 are constrained before the device
Plate can observe in real time the corrugation area strain field point in corrugation Instability under more wrinkle states using online strain measurement system
Cloth feature, and it is suitable for that there are the corrugation unstability situations of small wrinkle, and then to probe into sheet metal under complicated boundary condition
The instability Mechanism that wrinkles provides experimental basis.Compared with existing square plate diagonal stretch experimental provision, it can reach closer to typical case
The corrugation unstability pattern of drawing and forming engineer testing realizes Tensile or Compressive Loading property down conversion boundary condition and reaches different load roads
Diameter, when experiment, carry out single-ended stretching, without using double-action drawing machine, additionally it is possible to suitable for different shape, size and thickness
Sample 1, realize various sample under the conditions of to corrugation buckling effects research.
Connection component includes crossbeam 10, fixed block 7 and connecting stud 9, and left support component 2 and right support component 14 are symmetrically solid
Due to the lower end of crossbeam 10, specifically, left support component 2 and right support component 14 are fixedly welded on crossbeam 10, and fixed block 7 is solid
Due to the middle part of 10 upper end of crossbeam, specifically, fixed block 7 is fixed on crossbeam 10 by fixing screws 6,9 screw thread of connecting stud
It is connected to the middle part of 7 upper end of fixed block, entire experimental provision is connect by connecting stud 9 with universal material cupping machine, is had
Body, connection bolt has full thread；Nut 8 is provided on connecting stud 9, nut 8 is adjacent to fixed block 7, can be prevented whole
A experimental provision rotation.
The lower end of left support block 4 is installed on the lower end of 2 inside of left support component, left support component 2 by the first regulating part
On be provided with the first arcuate socket 19, the second arcuate socket, the first arcuate socket 19 and the second arc hole site are provided on left support block 4
It is corresponding, the second regulating part 3 and third regulating part are installed on the first arcuate socket 19 and the second arcuate socket, adjusted by adjusting first
Section part, the second regulating part 3 and third regulating part can adjust the tilt angle of left support block 4.Specifically, the first regulating part includes
First adjusts screw and the first adjusting nut, and the second regulating part 3 includes the second adjusting screw and the second adjusting nut, and third is adjusted
Part includes that third adjusts screw and third adjusting nut.When carrying out angular adjustment to left support block 4, so that first adjusts spiral shell
Female, the second adjusting nut and third adjusting nut loosen, and rotation left support block 4 tightens first after regulating angle
Adjusting nut, the second adjusting nut and third adjusting nut.
Left fixture 5 is installed on the side that left support block 4 is tilted to the right by the first screw.Specifically, left fixture 5 is existing
There is the fixture in technology, which includes two clamping plates disposed in parallel, and the gap between two clamping plates is adjustable.
The lower end of right support block 13 is installed on the lower end of 14 inside of right support component, right support component by the 4th regulating part
It is provided with third arcuate socket on 14, the 4th arcuate socket 20, third arcuate socket and the 4th arcuate socket 20 are provided on right support block 13
Position is corresponding, is equipped with the 5th regulating part and the 6th regulating part on third arcuate socket and the 4th arcuate socket 20, by adjusting
Four regulating parts, the 5th regulating part and the 6th regulating part can adjust the tilt angle of right support block 13.Specifically, the 4th regulating part
Screw and the 4th adjusting nut are adjusted including the 4th, the 5th regulating part includes the 5th adjusting screw and the 5th adjusting nut, and the 6th
Regulating part includes the 6th adjusting screw and the 6th adjusting nut.When carrying out angular adjustment to right support block 13, so that the 4th adjusts
It saves nut, the 5th adjusting nut and the 6th adjusting nut to loosen, rotates right support block 13, after regulating angle, twist
Tight 4th adjusting nut, the 5th adjusting nut and the 6th adjusting nut.
Right fixture 12 is installed on the side that right support block 13 is tilted to the left by the second screw 11.Specifically, right fixture
12 be fixture in the prior art, which includes two clamping plates disposed in parallel, and the gap between two clamping plates is adjustable.
It further include multiple 7th regulating parts in the present embodiment, the 7th regulating part includes that the 7th adjusting screw 16 and the 7th are adjusted
Nut 17 is provided with multiple first through hole on preceding constraint plate 15, and rear constrain is provided with multiple second through-holes on plate 18, and first
Through-hole and the second through-hole correspond, and are equipped with the 7th regulating part in corresponding first through hole and the second through-hole, pass through
Gap before adjusting the 7th regulating part and capable of adjusting between constraint plate 15 and rear constraint plate 18, specifically, by turning the
Seven adjusting nuts 17 adjust gap between the two.
In this specific embodiment, preceding constraint plate 15 and rear constraint plate 18 are transparent acrylic plate, preceding constraint
Plate 15 is identical with rear constraint 18 shape of plate, and preceding constraint plate 15 and rear constraint plate 18 are inverted trapezoidal plate.It answers online
Change measuring system is non-contact whole audience strain measurement system VIC-3D.
As shown in figure 3, there are two sides for the junction setting of the wedge-shaped part 101 and clamping part 102 of the sample 1 in the present embodiment
To opposite circular arc, the radius of two circular arcs is 10mm, and 1 whole height of sample is 105mm, and the width of clamping part 102 is
40mm, the width of wedge-shaped part 101 are 170mm, and the height of wedge-shaped part 101 is 48mm, the top margin of wedge-shaped part 101 and the angle of side
It is 45 °.
A kind of experimental method of sheet metal corrugation unstability feature exploring experimental facility is also provided in the present embodiment, including with
Lower step:
Step a: the sample 1 of the wedge shape of preparation multiple groups different sizes and shapes is first sprayed white on the surface of each sample 1
Color dumb light paint air-dries to priming paint as priming paint, certain interval of time and then sprays black matte paint on priming paint, so that
The black and white speckle of uniform gray level is formed on 1 surface of sample；
Step b: it is connect by connection component with universal material cupping machine, sample 1 is put in left support block 4 and right branch
On bracer 13, and make sample 1 between left fixture 5 and right fixture 12, preceding constraint plate 15 is placed in left 5 He of fixture
Rear constraint plate 18 is placed in the rear side of left fixture 5 and right fixture 12, and constrains plate 15 before connecting by the front side of right fixture 12
With rear constraint plate 18 so that sample 1 is located between preceding constraint plate 15 and rear constraint plate 18；
Step c: the two sides of sample 1 are polished, are polished by the adjusting of lubrication and gap, and removal is stayed because of the preparation of sample 1
Under scratch, sample 1 and the contact surface of left support block 4 and the contact surface of right support block 13 are lubricated using lubricating oil；It adjusts
The tilt angle of left fixture 5 and right fixture 12 is saved to adapt to the sample 1 of different sizes and shapes；Then left fixture 5 and examination are adjusted
Gap between sample 1 adjusts the gap between right fixture 12 and sample 1；Before adjusting constraint plate 15 and rear constraint plate 18 it
Between gap, make have certain gap between sample 1 and preceding constraint plate 15 and rear constraint plate 18, stretched through universal material
The bottom end of test machine clamping sample 1 is stretched, to simulate the corrugation unstability under typical drawing and forming engineer testing；
Step d: corrugation unstability Strain Distribution observation is formed the corrugation of sample 1 area using online strain measurement system more
Wrinkle carries out observation of taking pictures in real time online, to obtain the Strain Distribution feature of the corrugated regions similar to flange wrinkle.
Apply that a specific example illustrates the principle and implementation of the invention in this specification, above embodiments
Explanation be merely used to help understand method and its core concept of the invention；At the same time, for those skilled in the art,
According to the thought of the present invention, there will be changes in the specific implementation manner and application range.In conclusion in this specification
Appearance should not be construed as limiting the invention.
Claims (9)
- The unstability feature exploring experimental facility 1. a kind of sheet metal wrinkles, which is characterized in that including connection component, left support portion Part, left fixture, right support component, right support block, right fixture, preceding constraint plate, constrains plate and in line strain at left support block afterwards Measuring system, the left support component and the right support component are symmetrically fixed on the two sides of the connection component lower end, described Connection component with universal material cupping machine for connecting, and the left support block and the left support component are rotatablely connected, institute It states right support block and the right support component to be rotatablely connected, the left support block and the right support block are from top to bottom inwardly It is obliquely installed, the left fixture is fixed on the left support block, and the right fixture is fixed on the right support block, the left side Fixture and the right fixture are used to limit the normal direction movement of two sides of sample, and plate is constrained before described and the rear constraint is flat Plate is respectively placed in front side and the rear side of the sample, and plate is constrained before described and the rear constraint plate is detachably connected, and It is described before constraint plate and it is described after constraint plate between gap it is adjustable, it is described before constraint plate and it is described after constraint plate it is equal For transparent panel, the online strain measurement system is used to take pictures to more wrinkles progress that sample corrugation area is formed in real time online Observation.
- The unstability feature exploring experimental facility 2. sheet metal according to claim 1 wrinkles, which is characterized in that the connection Component includes crossbeam, fixed block and connecting stud, and the left support component and the right support component are symmetrically fixed on the cross The lower end of beam, the fixed block are fixed on the middle part of the crossbeam upper end, and the connecting stud is threadedly connected to the fixed block The middle part of upper end is provided with nut on the connecting stud.
- The unstability feature exploring experimental facility 3. sheet metal according to claim 1 wrinkles, which is characterized in that the left branch The lower end of bracer is installed on the lower end of the left support part innerside by the first regulating part, is provided on the left support component First arcuate socket is provided with the second arcuate socket, first arcuate socket and second arc hole site on the left support block It is corresponding, the second regulating part and third regulating part are installed on first arcuate socket and second arcuate socket, by adjusting First regulating part, second regulating part and the third regulating part can adjust the tilt angle of the left support block.
- The unstability feature exploring experimental facility 4. sheet metal according to claim 3 wrinkles, which is characterized in that the left folder Tool is installed on the side that the left support block is tilted to the right by the first screw.
- The unstability feature exploring experimental facility 5. sheet metal according to claim 4 wrinkles, which is characterized in that the right branch The lower end of bracer is installed on the lower end of the right support part innerside by the 4th regulating part, is provided on the right support component Third arcuate socket is provided with the 4th arcuate socket, the third arcuate socket and the 4th arc hole site on the right support block It is corresponding, the 5th regulating part and the 6th regulating part are installed on the third arcuate socket and the 4th arcuate socket, by adjusting 4th regulating part, the 5th regulating part and the 6th regulating part can adjust the tilt angle of the right support block.
- The unstability feature exploring experimental facility 6. sheet metal according to claim 5 wrinkles, which is characterized in that the right folder Tool is installed on the side that the right support block is tilted to the left by the second screw.
- The unstability feature exploring experimental facility 7. sheet metal according to claim 6 wrinkles, which is characterized in that further include more A 7th regulating part is provided with multiple first through hole on constraint plate before described, is provided with multiple the after described on constraint plate Two through-holes, the first through hole and second through-hole correspond, the corresponding first through hole and second through-hole On the 7th regulating part is installed, by adjusting the 7th regulating part can adjust it is described before constraint plate and it is described after about Gap between beam plate.
- The unstability feature exploring experimental facility 8. sheet metal according to claim 7 wrinkles, which is characterized in that before described about Beam plate and the rear constraint plate are transparent acrylic plate, and plate and the rear constraint writing board shape phase are constrained before described Together, and before described constraining plate and the rear constraint plate is inverted trapezoidal plate.
- 9. a kind of experiment side of such as sheet metal of any of claims 1-8 corrugation unstability feature exploring experimental facility Method, which comprises the following steps:Step a: the sample of the wedge shape of preparation multiple groups different sizes and shapes is first sprayed on the surface of each sample White dumb light paint air-dries to priming paint as priming paint, certain interval of time and then sprays black matte paint on priming paint, make Obtain the black and white speckle that uniform gray level is formed on the specimen surface；Step b: being connect by the connection component with universal material cupping machine, and the sample is put in the left support block On the right support block, and make sample between the left fixture and the right fixture, it will the preceding constraint plate It is placed in the front side of the left fixture and the right fixture, the rear constraint plate is placed in the left fixture and the right folder The rear side of tool, and connect it is described before constraint plate and it is described after constrain plate so that the sample be located at it is described before constrain plate Between the rear constraint plate；Step c: the two sides of the sample are polished, are polished by the adjusting of lubrication and gap, and removal leaves because of sample preparation Scratch, the sample and the contact surface of the left support block and the contact surface of the right support block are moistened using lubricating oil It is sliding；The tilt angle of the left fixture and the right fixture is adjusted to adapt to the sample of different sizes and shapes；Then it adjusts The gap between the left fixture and the sample is saved, the gap between the right fixture and the sample is adjusted；Described in adjusting Gap between preceding constraint plate and the rear constraint plate puts down the sample and the preceding constraint plate and the rear constraint There is certain gap between plate, stretched through the bottom end that universal material cupping machine clamps the sample, to simulate allusion quotation Corrugation unstability under type drawing and forming engineer testing；Step d: corrugation unstability Strain Distribution observation is formed sample corrugation area using the online strain measurement system More wrinkles carry out observation of taking pictures in real time online, to obtain the Strain Distribution feature of the corrugated regions similar to flange wrinkle.
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| CN112858005A (en) * | 2021-02-07 | 2021-05-28 | 燕山大学 | Metal plate shear stress wrinkling device and wrinkling instability characteristic measuring method thereof |
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| CN112858005A (en) * | 2021-02-07 | 2021-05-28 | 燕山大学 | Metal plate shear stress wrinkling device and wrinkling instability characteristic measuring method thereof |
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