CN203380703U - High-speed orthogonal cutting process strain measurement device based on digital image correlation method - Google Patents
High-speed orthogonal cutting process strain measurement device based on digital image correlation method Download PDFInfo
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- CN203380703U CN203380703U CN201320478515.3U CN201320478515U CN203380703U CN 203380703 U CN203380703 U CN 203380703U CN 201320478515 U CN201320478515 U CN 201320478515U CN 203380703 U CN203380703 U CN 203380703U
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Abstract
The utility model discloses a high-speed orthogonal cutting process strain measurement device based on the digital image correlation method. The high-speed orthogonal cutting process strain measurement device comprises high-speed digital cameras, a speckled workpiece, a tool, imaging lenses, a cold light source, a pedestal system and a computer, wherein the pedestal system is composed of a triangular support, a guide rail and a horizontal moving platform, and the computer is used for digital collecting and processing; the key point of measurement is that digital imagination (speckling) is conducted on the workpiece which is not machined, namely the surface of the workpiece is sprayed white, and then black speckles are sprayed on the white background randomly so as to constitute a speckle pattern. The high-speed orthogonal cutting process strain measurement device can measure digital images before and after deformation of the workpiece at any moment in a high-speed orthogonal cutting process, and deformation of the workpiece can be calculated according to the images. The high-speed orthogonal cutting process strain measurement device is suitable for high-speed orthogonal turning of any workpiece, is capable of achieving non-contact measurement, real-time measurement, full-field measurement and the like, and has higher measurement accuracy than a conventional measurement method, and the highest measurement accuracy can reach 0.01-0.0005 pixel.
Description
Technical field
The utility model relates to a kind of loading by means of digital image correlation method strain gauge means, is based on specifically the high speed orthogonal cutting process strain gauge means of loading by means of digital image correlation method.
Background technology
At present, after the CNC technology, high-speed cutting is processed to machinery manufacturing industry and has been brought revolutionary variation again.When its huge attraction is to realize highly-efficient processing, the unapproachable machining accuracy of original general NC and surface quality have been reached.But, different from conventional metals cutting, in high-speed machining process, comprise more complicated heat, power, machinery and coupling phenomenon thereof, plastic deformation as violent as workpiece in working angles, the transient state of cutter and workpiece contacts, the separating etc. of smear metal and workpiece.The workpiece deformation in working angles particularly, on the highly significant that affects of whole cutting process.Not only affect the crudy of workpiece, such as surface roughness, surface residual stress and dimensional accuracy, and can affect service life of cutter.Therefore, the distortion of workpiece in the research high-speed cutting, to machining accuracy, assurance crudy, the real meaning of enhancing productivity that improves high-speed cutting processing.Yet, the row be out of shape due to metal cutting becomes reason intricate, influence factor is numerous and complicated staggered, cause its research very difficult with monitoring, existing research method focuses mostly in finite element simulation and uses some traditional distortion or displacement measurement impedance sensor (such as extensometer and Linear displacement transducer LVDT etc.), be difficult to realize each point comprehensive measurement of concrete displacement at any one time in bulk deformation and measurement category, there is a lot of limitation.During high-speed cutting, strain rate can arrive 10
5above, traditional measuring method is difficult to reach.
Domestic many scholars have had darker research to the basic theory aspect of digital image method, as professor Jin Guanchang of Tsing-Hua University etc., but not yet carry out the product development after system research.
The utility model content
The purpose of this utility model is for overcoming above-mentioned the deficiencies in the prior art, a kind of high speed orthogonal cutting process strain gauge means based on loading by means of digital image correlation method is provided, utilize this device to be processed by the surface of the work two width images to gathering before and after distortion, by calculating to realize the measurement to deformation of body field (displacement field).It has made up the deficiency of current deformation measurement, can realize non-cpntact measurement, measurement of full field, measurement in real time etc., and accuracy of measurement is high, facility simple to operate.
For achieving the above object, the utility model adopts following technical proposals:
A kind of high speed orthogonal cutting process strain gauge means based on loading by means of digital image correlation method, comprise the first high-speed digital photography machine and the second high-speed digital photography machine, the first high-speed digital photography machine and relative the first imaging lens and the second imaging lens of being provided with respectively on the second high-speed digital photography machine, be provided with the cold light source over against workpiece between the first high-speed digital photography machine and the second high-speed digital photography machine, the first high-speed digital photography machine, the second high-speed digital photography machine and cold light source all are installed on by tripod, on the support system that guide rail and platform form, and the first high-speed digital photography machine is connected with computer by data wire with the second high-speed digital photography machine.
The guide rails assembling of described support system is on platform side, and platform is installed on tripod, and the first high-speed digital photography machine, the second high-speed digital photography machine and cold light source all are installed on guide rail.
Angle between the axis of described two high-speed digital photography machines is 25 °.
Described cold light source is 150W.
High speed orthogonal cutting process strain measurement method based on loading by means of digital image correlation method, adopt Digital Image Correlation Method, in conjunction with technique of binocular stereoscopic vision, adopt two high-speed cameras, the digital speckle image of each deformation stage of workpiece in Real-time Collection orthogonal cutting, then calculate strain and the distortion of workpiece with computer processing system, concrete implementation step is as follows:
1) adopt quadrature turning experiment front by the surface of the work painted white, then spray black spot on white background, carry out the mark of dot matrix, speckle pattern as subsequent treatment, in order to guarantee certainty of measurement, the average diameter that should make the speckle particle in speckle pattern is 2～3 pixels, and speckle image is of a size of 1024 * 1024 pixels;
2) in measure field, build the 3 D digital imaging collecting device formed by two high-speed digital photography machines, the position of equipment is relatively fixing, and the distance that arrives target workpiece is 350mm, and places at the scene a cold light source; Open cold light source, with scaling board, the high-speed digital photography machine is demarcated, calibration result is 0.0353mm/pixel, and visual field is 128mm * 96mm;
3) on numerically controlled lathe, the workpiece of aforementioned processing is done to high speed orthogonal cutting, with two high-speed digital photography machines, in real time finished surface is carried out to camera monitoring from the side, gather the speckle pattern of surface of the work distortion front and back, the frame frequency of video acquisition is 1～50000fps;
4) turning processing stops, and IMAQ is complete, sends data to computer, by process image and the numerical data obtained with computer processing system; Gather two width digital speckle figure of workpiece deformation front and back and deposit computer in the high-speed digital photography machine, the corresponding speckle pattern addition of two width is obtained to the speckle pattern of a width double-exposure, then it is carried out to Fourier transformation twice, just obtain a main peak and two secondary peaks in the output face of Fourier transformation for the second time, peak coordinate is detected and just can access deflection.
Through verification experimental verification, the strain measurement scope is 0.01%～1000%.
The beneficial effects of the utility model are:
Adopt this device to utilize Digital Image Correlation Method to be measured the distortion in high-speed cutting, can overcome the defect of traditional impedance type measuring system, realize each point comprehensive measurement of concrete displacement at any one time in bulk deformation and measurement category.Specifically surface is in the following areas:
(1) non-cpntact measurement: do not need strain to take into account complicated circuit, do not need to do accurate setting for obtaining complete result, sample does not have the mechanical force reciprocation, can within a few minutes, be ready to complete, and can not be subject to the impact of intermediate plate, strain gauge and chemistry coating yet.
(2) measure in real time: deflection or the displacement of any time in can the measuring workpieces deformation process.
(3) the data precision measured is high, does not need to wait as long for analysis, facility simple to operate.Distortion for vibrating object, high-speed object and small items can be equipped with analysis module, to complete the measurement task.
(4) this device is applicable to any workpiece of high speed quadrature turning, can realize non-cpntact measurement, measurement in real time, measurement of full field etc., and certainty of measurement is higher than traditional measurement mode, and the precision of test reaches as high as 0.01～0.0005 pixel.
The accompanying drawing explanation
Fig. 1 is the effect schematic diagram of workpiece after the digital speckle spraying;
Fig. 2 is the schematic diagram that loading by means of digital image correlation method is measured the orthogonal cutting anamorphotic system;
In figure, symbol description is as follows: 1 first high-speed digital photography machine; 2 second high-speed digital photography machines; 3 first imaging lens; 4 second imaging lens; 5 cold light sources; 6. support system; 7 computers; 8 workpiece; 9 cutters, 10. smear metal, the speckle after the black splotch representative spraying in Fig. 1.
The specific embodiment
Below in conjunction with drawings and Examples, the utility model is further illustrated.
A kind of high speed orthogonal cutting workpiece strain measurement method based on loading by means of digital image correlation method, be characterized in utilizing loading by means of digital image correlation method to carry out deformation measurement to workpiece.Utilize the 3 D deformation field on test specimen surface under the three-dimensional appearance on three-dimensional digital image correlation technique calculation testing piece surface and different conditions.
Wherein, workpiece will carry out pretreatment before processing, sprays speckle image, and the schematic diagram after processing as shown in Figure 1.At first by white substrate on workpiece surface spraying, then spray black spot in the above, form random speckle pattern.
Measuring system of the present utility model as shown in Figure 2.Whole measuring system comprises the first high-speed digital photography machine 1, the second high-speed digital photography machine 2, the first imaging lens 3, the second imaging lens 4, cold light source 5, and the bearing be comprised of tripod, guide rail and platform is 6, computer 7, workpiece 8 and cutter 9 form.The first high-speed digital photography machine 1 and relative the first imaging lens 3 and the second imaging lens 4 of being provided with respectively on the second high-speed digital photography machine 2, be provided with the cold light source 5 over against workpiece 8 between the first high-speed digital photography machine 1 and the second high-speed digital photography machine 2, the first high-speed digital photography machine 1, the second high-speed digital photography machine 2 and cold light source 5 all are installed on the support system 6 be comprised of tripod, guide rail and platform, and the first high-speed digital photography machine 1 is connected with computer 7 by data wire with the second high-speed digital photography machine 2.
The guide rails assembling of support system 6 is on platform side, and platform is installed on tripod, and the first high-speed digital photography machine 1, the second high-speed digital photography machine 2 and cold light source 5 all are installed on guide rail.
Wherein, the angle between the installation of two high-speed digital photography machines is 25 °, and camera lens is 350mm to the distance between workpiece, cold light source power 150W.
During measurement, gather two width digital speckle figure of workpiece deformation front and back and deposit computer in the high-speed digital photography machine, the corresponding speckle pattern addition of two width is obtained to the speckle pattern of a width double-exposure, then it is carried out to Fourier transformation twice, just obtain a main peak and two secondary peaks in the output face of Fourier transformation for the second time, peak coordinate is just detected and can obtain deflection.
Embodiment
With reference to Fig. 1, do cutting on speed lathe, with the distortion of digital image method measuring workpieces.At first be to make speckle pattern on workpiece 8; Then workpiece 8 is pressed from both sides at the enterprising luggage of lathe, the installation testing equipment is also adjusted it, opens light source, carries out camera calibration, visual field 128mm * 96mm.Arrange subsequently miscellaneous equipment, guarantee that measured workpiece does not exceed visual field in whole measuring process.
After preparation completes, carry out turning processing, the speed of mainshaft of lathe is 2000 rev/mins, cutting depth 2mm, and the amount of feeding is that 0.2mm/ turns.Cutter 9 turners 8 produce smear metal 10.Add man-hour, opening camera simultaneously and carry out IMAQ, monitoring at any time the surface of the work of spraying speckle pattern with two high-speed digital photography machines, the industrial CCD video camera MVVD078SM that video camera is 1280 * 960pixel.
After IMAQ is complete, with software processing system, view data is processed, determine the distortion of object according to the correlation of speckle field before and after distortion of surface of the work random distribution, specifically: a small images of the image before deformation of body is defined as to the sample subarea, image after distortion that small images corresponding with the sample subarea is defined as the target subarea, find out the one-to-one relationship between target subarea and sample subarea, just can extract the deflection of workpiece.
Although above-mentioned, by reference to the accompanying drawings the specific embodiment of the present utility model is described; but be not the restriction to the utility model protection domain; on the basis of the technical solution of the utility model, those skilled in the art do not need to pay various modifications that creative work can make or distortion still in protection domain of the present utility model.
Claims (4)
1. the high speed orthogonal cutting process strain gauge means based on loading by means of digital image correlation method, it is characterized in that, comprise the first high-speed digital photography machine and the second high-speed digital photography machine, the first high-speed digital photography machine and relative the first imaging lens and the second imaging lens of being provided with respectively on the second high-speed digital photography machine, be provided with the cold light source over against workpiece between the first high-speed digital photography machine and the second high-speed digital photography machine, the first high-speed digital photography machine, the second high-speed digital photography machine and cold light source all are installed on by tripod, on the support system that guide rail and platform form, and the first high-speed digital photography machine is connected with computer by data wire with the second high-speed digital photography machine.
2. device as claimed in claim 1, is characterized in that, the guide rails assembling of described support system is on platform side, and platform is installed on tripod, and the first high-speed digital photography machine, the second high-speed digital photography machine and cold light source all are installed on guide rail.
3. device as claimed in claim 1, is characterized in that, the angle between the axis of described two high-speed digital photography machines is 25 °.
4. device as claimed in claim 1, is characterized in that, described cold light source is 150W.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103394973A (en) * | 2013-08-06 | 2013-11-20 | 山东大学 | Device and method for measuring high-speed orthogonal cutting process strain through digital image correlation method |
| CN105510125A (en) * | 2016-01-12 | 2016-04-20 | 济南大学 | Video extensometer and marker line positioning method based on video extensometer |
| CN114964578A (en) * | 2022-07-27 | 2022-08-30 | 华能(浙江)能源开发有限公司玉环分公司 | Water-cooled wall online stress monitoring method and device based on digital speckles |
-
2013
- 2013-08-06 CN CN201320478515.3U patent/CN203380703U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103394973A (en) * | 2013-08-06 | 2013-11-20 | 山东大学 | Device and method for measuring high-speed orthogonal cutting process strain through digital image correlation method |
| CN105510125A (en) * | 2016-01-12 | 2016-04-20 | 济南大学 | Video extensometer and marker line positioning method based on video extensometer |
| CN114964578A (en) * | 2022-07-27 | 2022-08-30 | 华能(浙江)能源开发有限公司玉环分公司 | Water-cooled wall online stress monitoring method and device based on digital speckles |
| CN114964578B (en) * | 2022-07-27 | 2022-11-15 | 华能(浙江)能源开发有限公司玉环分公司 | Water-cooled wall online stress monitoring method and device based on digital speckles |
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