CN107238534A - The method and device of on-line monitoring plate stretch performance is calculated based on image - Google Patents
The method and device of on-line monitoring plate stretch performance is calculated based on image Download PDFInfo
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- CN107238534A CN107238534A CN201710420467.5A CN201710420467A CN107238534A CN 107238534 A CN107238534 A CN 107238534A CN 201710420467 A CN201710420467 A CN 201710420467A CN 107238534 A CN107238534 A CN 107238534A
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000012360 testing method Methods 0.000 claims abstract description 29
- 238000012545 processing Methods 0.000 claims abstract description 15
- 239000000463 material Substances 0.000 claims abstract description 14
- 239000011324 bead Substances 0.000 claims abstract description 4
- 230000000007 visual effect Effects 0.000 claims abstract description 4
- 238000002474 experimental method Methods 0.000 claims description 6
- 238000004458 analytical method Methods 0.000 claims description 5
- 238000006073 displacement reaction Methods 0.000 claims description 5
- 238000004080 punching Methods 0.000 claims description 5
- 238000005259 measurement Methods 0.000 claims description 4
- 230000003068 static effect Effects 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 238000012546 transfer Methods 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 abstract description 6
- 239000002184 metal Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 238000013480 data collection Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
Classifications
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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
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
-
- 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
- G01N3/06—Special adaptations of indicating or recording means
- G01N3/068—Special adaptations of indicating or recording means with optical indicating or recording means
-
- 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
-
- 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
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
-
- 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
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0075—Strain-stress relations or elastic constants
-
- 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
- G01N2203/0278—Thin specimens
- G01N2203/0282—Two dimensional, e.g. tapes, webs, sheets, strips, disks or membranes
-
- 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
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/0641—Indicating or recording means; Sensing means using optical, X-ray, ultraviolet, infrared or similar detectors
- G01N2203/0647—Image analysis
-
- 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
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/0641—Indicating or recording means; Sensing means using optical, X-ray, ultraviolet, infrared or similar detectors
- G01N2203/0652—Indicating or recording means; Sensing means using optical, X-ray, ultraviolet, infrared or similar detectors using contrasting ink, painting, staining
Abstract
The invention discloses a kind of device that on-line monitoring plate stretch performance is calculated based on image, including test mould terminal, on-line real time monitoring terminal and data processing terminal；Test mould terminal includes rectangle punch-pin, cavity plate and blank holder；On-line real time monitoring terminal includes two industrial cameras, support and two LED/light sources；Data processing terminal includes computer, capture card and control cabinet；The cavity plate is fixed, blank holder is socketed with outside rectangle punch-pin, rectangle punch-pin is moved up and down by two hydraulic pump controls, bead is provided with the blank holder, the cavity plate side is provided with two openings for being used to provide the visual field to two industrial cameras, and two industrial cameras and two LED/light sources are fixed on immediately ahead of test mould terminal by support.The present invention replaces cupping machine using die structure device, and applies advanced 3-dimensional digital speckle image technology, by dynamically carrying out on-line real time monitoring to sheet material in test process, it is achieved thereby that the calculating of plate stretch performance.
Description
Technical field
The present invention relates to real time on-line monitoring technology is carried out on die structure device, and in particular to one kind is based on image meter
Calculate the method and device of on-line monitoring plate stretch performance.
Background technology
Sheet metal is widely used in terms of space flight and aviation, automobile making, and the tensile property of sheet material is all by stretching
Test airborne measurements to obtain, and be differently stressed state in Sheet Metal Forming, mould is passed through there is presently no one kind
Device obtains the tensile property of sheet material.Meanwhile, it is that the test specimen that will be deformed or be broken disassembles manual survey in traditional material test
Amount, causes the research in terms of the problems such as precision is low, error Yamato work catches difficult, influence sheet material mechanical property.
The content of the invention
To solve the above problems, the invention provides a kind of method that on-line monitoring plate stretch performance is calculated based on image
And device, cupping machine is replaced using die structure device, and advanced 3-dimensional digital speckle image technology is applied, in test
During by sheet material dynamically carry out on-line real time monitoring, it is achieved thereby that the calculating of plate stretch performance.
To achieve the above object, the technical scheme taken of the present invention is：
A kind of device that on-line monitoring plate stretch performance is calculated based on image, including test mould terminal, it is online in real time
Monitoring terminal and data processing terminal；The test mould terminal includes rectangle punch-pin, cavity plate and blank holder；It is described online real-time
Monitoring terminal includes two industrial cameras, support and two LED/light sources；The data processing terminal includes computer, capture card
And control cabinet；The cavity plate is fixed, and blank holder is socketed with outside rectangle punch-pin, and rectangle punch-pin is transported above and below two hydraulic pump controls
It is dynamic, bead is provided with the blank holder, prevents plate from being moved to periphery；The cavity plate side is used for two provided with two
Industrial camera provides the opening in the visual field, and two industrial cameras and two LED/light sources are before support is fixed on test mould terminal just
Side, and ensure that light source can be illuminated to whole test mould terminal；Computer controls two industrial cameras and two with control cabinet
Individual LED/light source and connection image pick-up card；Two industrial cameras and two LED/light sources connect control cabinet, capture card and computer,
And by computer control.
The monitoring method of the above-mentioned device that on-line monitoring plate stretch performance is calculated based on image, is comprised the following steps：
S1, experiment mould device is debugged, and in the speckle pattern of test specimen surface spraying black and white random distribution；
S2, surface is shot to the different azimuth of two industrial cameras with scaling board carry out demarcation calibration, it is ensured that two cameras
The data syn-chronization collected；
S3, unlatching test mould terminal, carry out punching press, computer controls and gathered the Board Under Test that sync pulse jamming is arrived to sheet material
Sequence image of the material during deformation (stretching, punching press etc.), and the image information collected is passed by data transmission link
It is sent to processing terminal；
The processing and analysis of S4, processing terminal to data, the test specimen image chosen under a deformation state are set to base
Plinth state, creates speckle regions and selectes a seed point, the speckle gray feature change before and after matching deformation；
S5, according to camera calibration result and images match result, using principle of triangulation, to the central point of image subsection
Three dimensional reconstruction is carried out, the changes in coordinates of tested sample surface measured point is tracked, each of which deformation state corresponding relation is calculated
Deformation information.
Wherein, the step S2 is concretely comprised the following steps：Displacement in units of pixel, carries out demarcation with scaling board and draws picture
The conversion relation of element and long measure, and ensure the data syn-chronization that two cameras are collected, cannot be to experiment after demarcation
System does any transfer, otherwise needs to re-scale
Wherein, displacement error maximum after static analysis realizes the micron-sized precision of measurement in 0-5.5um.
The invention has the advantages that：
The tensile mechanical properties of sheet material measurement on die structure device, and mutually tied with Digital image technology measuring method
Close, the mechanical property for acquisition sheet material provides a kind of new method.
Brief description of the drawings
Fig. 1 is a kind of structural representation for the device that on-line monitoring plate stretch performance is calculated based on image of the embodiment of the present invention
Figure.
Fig. 2 is the structural representation of experiment die terminal in the embodiment of the present invention.
Fig. 3 is image calculating measuring strain flow chart in the embodiment of the present invention.
Embodiment
In order that objects and advantages of the present invention are more clearly understood, the present invention is carried out with reference to embodiments further
Describe in detail.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to limit this hair
It is bright.
As Figure 1-Figure 2, on-line monitoring plate stretch performance is calculated based on image the embodiments of the invention provide one kind
Device, including test mould terminal, on-line real time monitoring terminal and data processing terminal；The test mould terminal includes square
Shape punch-pin 1, cavity plate 2 and blank holder 6；The on-line real time monitoring terminal includes two industrial cameras, support and two LED/light sources
5；The data processing terminal includes computer, capture card and control cabinet；The cavity plate is fixed, and flanging is socketed with outside rectangle punch-pin
Circle, rectangle punch-pin is moved up and down by two hydraulic pump controls, is provided with bead on the blank holder, prevents plate from being moved to periphery
It is dynamic；The cavity plate side is provided with two openings for being used to provide the visual field to two industrial cameras, two industrial cameras and two LED
Light source is fixed on immediately ahead of test mould terminal by support, and ensures that light source can be illuminated to whole test mould terminal；Meter
Calculation machine controls two industrial cameras and two LED/light sources with control cabinet and is connected image pick-up card；Two industrial cameras and two
LED/light source connection control cabinet, capture card and computer, and by computer control.
As shown in figure 3, the embodiment of the present invention is additionally provided calculates on-line monitoring plate stretch performance monitoring side based on image
Method, comprises the following steps：
S1, the assembling by said structure completion experimental provision so that blank holder, which is moved downward, presss from both sides sample 3 with cavity plate closure
Tightly, the downward punching press of punch-pin, and the corresponding focal length of camera is adjusted, film speed clearly to photograph speckle regions
Before S2, experiment start, the spot pattern dissipated in test specimen surface spraying black and white random distribution.
First static state is analyzed before S3, progress experimental data collection, to ensure accuracy, and drawn after static analysis most
Big displacement error realizes the precision of micron level in 0-5.5um.
Start die device after S4, setting experiment parameter, computer controls and gathers two industrial camera sync pulse jamming quilts
Sequence image of the drafting board material during deformation (stretching, punching press etc.), realizes the collection of real time on-line monitoring terminal log evidence；
S5, using Digital image technology processing terminal is sent to by data transmission link to the image information collected.
S6, the speckle image progress computing using computer to collecting, choose the test specimen under a deformation state
Image is set to base state, creates speckle regions and selectes a seed point, the speckle gray feature change before and after matching deformation；
S7, according to camera calibration result and images match result, using principle of triangulation, to left and right camera image sub-district
Central point carry out three dimensional reconstruction, calculate it in each deformation by tracking the changes in coordinates of tested sample surface measured point
The deformation information of state corresponding relation.
S8, finally according to deformation information draw die device detect material elongation strain value.
Described above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (4)
1. it is a kind of based on image calculate on-line monitoring plate stretch performance device, it is characterised in that including test mould terminal,
On-line real time monitoring terminal and data processing terminal；The test mould terminal includes rectangle punch-pin, cavity plate and blank holder；It is described
On-line real time monitoring terminal includes two industrial cameras, support and two LED/light sources；The data processing terminal includes calculating
Machine, capture card and control cabinet；The cavity plate is fixed, and blank holder is socketed with outside rectangle punch-pin, rectangle punch-pin is by two hydraulic pump controls
System is moved up and down, and bead is provided with the blank holder, and the cavity plate side is used to carry to two industrial cameras provided with two
For the opening in the visual field, two industrial cameras and two LED/light sources are fixed on immediately ahead of test mould terminal by support, and ensure light
Source can be illuminated to whole test mould terminal；Computer and control cabinet control two industrial cameras and two LED/light sources and
Connect image pick-up card；Two industrial cameras and two LED/light sources connect control cabinet, capture card and computer, and by computer
Control.
2. the monitoring method of the device as claimed in claim 1 that on-line monitoring plate stretch performance is calculated based on image, it is special
Levy and be, comprise the following steps：
S1, experiment mould device is debugged, and in the speckle pattern of test specimen surface spraying black and white random distribution；
S2, surface is shot to the different azimuth of two industrial cameras with scaling board carries out demarcation calibration, it is ensured that two cameras are gathered
The data syn-chronization arrived；
S3, test mould terminal is opened, punching press is carried out to sheet material, computer controls and gathered the tested sheet material that sync pulse jamming arrives and exists
Sequence image in deformation process, and the image information collected is sent to processing terminal by data transmission link；
The processing and analysis of S4, processing terminal to data, the test specimen image chosen under a deformation state are set to basic shape
State, creates speckle regions and selectes a seed point, the speckle gray feature change before and after matching deformation；
S5, according to camera calibration result and images match result, using principle of triangulation, the central point of image subsection is carried out
Three dimensional reconstruction, tracks the changes in coordinates of tested sample surface measured point, calculates the change of each of which deformation state corresponding relation
Shape information.
3. the monitoring method of the device as claimed in claim 2 that on-line monitoring plate stretch performance is calculated based on image, it is special
Levy and be, the step S2's concretely comprises the following steps：Displacement in units of pixel, carries out demarcation with scaling board and draws pixel and length
The conversion relation of unit is spent, and ensures the data syn-chronization that two cameras are collected, after demarcation, experimental system cannot be done
It is any to transfer, otherwise need to re-scale.
4. the monitoring method of the device that on-line monitoring plate stretch performance is calculated based on image described in claim 2, its feature
It is, maximum displacement error realizes the micron-sized precision of measurement in 0-5.5um after static analysis.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710420467.5A CN107238534A (en) | 2017-05-24 | 2017-05-24 | The method and device of on-line monitoring plate stretch performance is calculated based on image |
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| CN201710420467.5A CN107238534A (en) | 2017-05-24 | 2017-05-24 | The method and device of on-line monitoring plate stretch performance is calculated based on image |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108007352A (en) * | 2018-01-05 | 2018-05-08 | 洛阳理工学院 | Foot stress measuring device based on Digital Speckle Correlation Method |
| CN108303315A (en) * | 2018-01-16 | 2018-07-20 | 南京理工大学 | Membrane material tensile mechanical properties test behaviour strain measurement method |
| CN108827793A (en) * | 2018-06-22 | 2018-11-16 | 江西豪斯特汽车零部件有限公司 | A kind of plate high temperature cross stretching device |
| CN109612400A (en) * | 2018-12-07 | 2019-04-12 | 广州大学 | A kind of the material deformation degree dynamic measurement method and system of view-based access control model tracking |
| CN109737880A (en) * | 2019-02-28 | 2019-05-10 | 上海应用技术大学 | A kind of optical measuring device and working method of plate |
| CN111380750A (en) * | 2020-04-13 | 2020-07-07 | 北京科技大学 | Amnion tissue non-contact full-field deformation measurement method using methylene blue to make spots |
| CN112629839A (en) * | 2020-11-19 | 2021-04-09 | 西北工业大学 | Method for measuring strain around turbine blade air film hole |
| CN113112470A (en) * | 2021-04-08 | 2021-07-13 | 西安道法数器信息科技有限公司 | Cold rolling process steel bending detection and analysis method based on artificial intelligence |
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| CN202101900U (en) * | 2011-05-25 | 2012-01-04 | 山东大学 | DIC-based plate forming property test device |
| CN102305745A (en) * | 2011-05-25 | 2012-01-04 | 山东大学 | Differential-interference-contrast (DIC)-technology-based sheet metal forming performance testing device |
| CN103575227A (en) * | 2013-09-23 | 2014-02-12 | 西安新拓三维光测科技有限公司 | Vision extensometer implementation method based on digital speckles |
| CN205027613U (en) * | 2015-10-15 | 2016-02-10 | 山东大学（威海） | Sheet forming performance measurement device |
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| CN101655352A (en) * | 2009-09-15 | 2010-02-24 | 西安交通大学 | Three-dimensional speckle strain measurement device and measurement method thereof |
| CN202101900U (en) * | 2011-05-25 | 2012-01-04 | 山东大学 | DIC-based plate forming property test device |
| CN102305745A (en) * | 2011-05-25 | 2012-01-04 | 山东大学 | Differential-interference-contrast (DIC)-technology-based sheet metal forming performance testing device |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108007352A (en) * | 2018-01-05 | 2018-05-08 | 洛阳理工学院 | Foot stress measuring device based on Digital Speckle Correlation Method |
| CN108007352B (en) * | 2018-01-05 | 2024-03-15 | 洛阳理工学院 | Foot stress measuring device based on digital speckle correlation technology |
| CN108303315A (en) * | 2018-01-16 | 2018-07-20 | 南京理工大学 | Membrane material tensile mechanical properties test behaviour strain measurement method |
| CN108827793A (en) * | 2018-06-22 | 2018-11-16 | 江西豪斯特汽车零部件有限公司 | A kind of plate high temperature cross stretching device |
| CN109612400A (en) * | 2018-12-07 | 2019-04-12 | 广州大学 | A kind of the material deformation degree dynamic measurement method and system of view-based access control model tracking |
| CN109737880A (en) * | 2019-02-28 | 2019-05-10 | 上海应用技术大学 | A kind of optical measuring device and working method of plate |
| CN111380750A (en) * | 2020-04-13 | 2020-07-07 | 北京科技大学 | Amnion tissue non-contact full-field deformation measurement method using methylene blue to make spots |
| CN112629839A (en) * | 2020-11-19 | 2021-04-09 | 西北工业大学 | Method for measuring strain around turbine blade air film hole |
| CN113112470A (en) * | 2021-04-08 | 2021-07-13 | 西安道法数器信息科技有限公司 | Cold rolling process steel bending detection and analysis method based on artificial intelligence |
| CN113112470B (en) * | 2021-04-08 | 2023-12-15 | 揭阳市柏亿不锈钢有限公司 | Cold rolling process steel bending detection analysis method based on artificial intelligence |
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Application publication date: 20171010 |