CN105108358A - Real-time detection and control device and method for slit width image of carbon dioxide laser cut die plate - Google Patents
Real-time detection and control device and method for slit width image of carbon dioxide laser cut die plate Download PDFInfo
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- CN105108358A CN105108358A CN201510585476.0A CN201510585476A CN105108358A CN 105108358 A CN105108358 A CN 105108358A CN 201510585476 A CN201510585476 A CN 201510585476A CN 105108358 A CN105108358 A CN 105108358A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/36—Removing material
- B23K26/38—Removing material by boring or cutting
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Abstract
The invention discloses a real-time detection and control device and method for a slit width image of a carbon dioxide laser cut die plate. The device comprises an auxiliary light source assembly disposed at the lower end of a laser cutting head and a rangefinder optical lens assembly disposed on one side of the laser cutting head, wherein the auxiliary light source assembly comprises a support and three auxiliary light sources; the support is fixedly connected to the lower end of the laser cutting head, the three auxiliary light sources are fixedly connected to the support and distributed equidistantly, and the intersection point of emergent light of the three auxiliary light sources is disposed at a cutting point; the rangefinder optical lens assembly comprises an upper camera support, a lower camera support, a camera carrier, a charge coupled device (CCD) camera, a light filter and an industrial telecentric lens. The real-time detection and control device and method are used for achieving efficient, automatic and accurate detection and control and the like of the slit width of the carbon dioxide laser cut die plate; besides, the device is low in cost, small and exquisite in structure, convenient to mount and easy to operate.
Description
Technical field
The invention belongs to field of photodetection, particularly carbon dioxide laser cutting cross-cutting board stitches the real-time measuring and controlling device of wide image and method.
Background technology
Need to use a large amount of die cutting plates in the manufacture process of all multi-products of press-packaging industry and electronic digital product.Due to the diversity of die-cutting process, the cutter on die cutting plate, the specification of line are varied, and the slot width on the material of die cutting plate, thickness and plate also has a lot of specification.The wide requirement of die cutting plate opposite joint is relatively strict, stitches wide, to inlay enter cutter, line chucking power can be very little, easily cause cutter, time serious, can die-cutting machine be damaged.Stitch narrow, the distortion that cutter edge is not entered or edge enters to cause monoblock die cutting plate reluctantly, causes using.Laser cutting is as the topmost manufacturing process of current die cutting plate, although comparatively traditional handicraft efficiency greatly improves, because of its cutting process relative complex, makes slot stitch wide uniformity and can not be guaranteed.
Testing die cutting plate used is that 18mm is thick, the birch laminate that book size is 1.22 meters × 2.44 meters.
At present, two classes are mainly contained to the measuring method of slot width, one class adopts clearance gauge hand dipping, this method troublesome poeration, efficiency are low, low precision, another kind of is utilize picture size measuring instrument to measure the sheet material cut down, measuring instrument is expensive, can only spot measurement, and these two class methods all cannot accomplish real-time measurement.Domestic Machine Vision Detection focuses mostly in laser weld field, and all with the molten bath at pad place for detected object, during due to Equation of Laser Cutting Die-boards, the ablation flame at cut point place can be subject to the impact of the external environments such as assist gas and make it wide without obvious linear relationship with seam.
Therefore, in carbon dioxide laser cutting cross-cutting board field in the urgent need to a kind of high accuracy, in real time, the wide measuring and controlling device of seam and method automatically.
Summary of the invention
Technical problem solved by the invention is to provide a kind of carbon dioxide laser cutting cross-cutting board to stitch the real-time measuring and controlling device of wide image and method.
The technical solution realizing the object of the invention is: a kind of carbon dioxide laser cutting cross-cutting board stitches the real-time measuring and controlling device of wide image, comprise the secondary light source assembly being positioned at laser cutting head lower end and the paraxial optics lens assembly being positioned at laser cutting head side, wherein secondary light source assembly comprises support and three secondary light sources, support is fixed on the lower end of laser cutting head, three secondary light sources are connected on support and in being equally spaced, the intersection point of its emergent light is positioned on cut point; Described paraxial optics lens assembly comprises camera upper bracket, camera lower carriage, camera carriage, CCD camera, optical filter and industrial telecentric lens, wherein camera upper bracket is fixed on lathe fixed head, the lower end of camera upper bracket arranges camera lower carriage, camera lower carriage arranges camera carriage, camera carriage is connected CCD camera, the front end of CCD camera arranges industrial telecentric lens, arranges optical filter between CCD camera and industrial telecentric lens; Wherein camera lower carriage is flexibly connected with the lower end of camera upper bracket, and camera carriage is flexibly connected with camera lower carriage.
Stitch a detecting and control method for the real-time measuring and controlling device of wide image based on above-mentioned carbon dioxide laser cutting cross-cutting board, comprise the following steps:
Step 1, determine wavelength window, the spectrogram at cut point place when detecting carbon dioxide laser cutting cross-cutting board with fiber spectrometer, and by analyzing the curve of spectrum, choose 380nm wave band secondary light source and optical filter;
Step 2, camera calibration, be placed in standard calibration plate on telecentric lens focal length, carries out organizing shooting more, obtain the pixel average that target unit width is corresponding with industrial camera to it;
Step 3, slot IMAQ, aim at cutting zone with industrial camera, and make cut point be positioned at picture centre, the consecutive image comprising slot formed after shooting laser cutting;
Step 4, stitch wide detection, to the slot image obtained in step 3, add up obtain stitching wide pixel value corresponding in the picture by enhancing, filtering, binaryzation, opening operation, rim detection, area grayscale value;
The wide actual value of step 5, opposite joint calculates, and obtains stitching wide developed width value;
Step 6, stitch wide control, utilize and detect gained seam width values and preset the difference of stitch width values cutting head is controlled, realize stitching wide servo antrol.
Compared with prior art, its remarkable advantage is in the present invention: (1) the present invention adopt the secondary light source of 380nm wavelength and be equipped with respective filter can effectively filtering 10.6 mum wavelength high-power cutting wooden plywood time cut point place ablation flame and can the interference of external stray light; (2) camera support of the present invention can realize any adjustment of camera locus; (3) present invention achieves the wide measurement of seam on two dimensional surface; (4) be the center of circle because image processing region is positioned at cut point, radius be 1mm circumferentially, therefore the real-time that detects can be ensured to greatest extent; (5) low, the compact structure of package unit cost, be convenient to install, be easy to operation; (6) detection speed is fast, precision is high.
Below in conjunction with accompanying drawing, the present invention is described in further detail.
Accompanying drawing explanation
Fig. 1 is apparatus of the present invention oblique view.
Fig. 2 is secondary light source assembly oblique view.
Fig. 3 is the oblique view of camera upper bracket.
Fig. 4 is the block diagram of the inventive method.
Implication representated by number in the figure is: 1. lathe fixed head, 2. camera upper bracket, 2-1. horizontal segment, the vertical section of 2-2., 2-3. bending segment, 3. camera lower carriage, 4. camera carriage, 5.CCD camera, 6. optical filter, 7. industrial telecentric lens, 8. laser cutting head 9. secondary light source support, 10. secondary light source assembly, 11.LED lamp pearl and collector lens, 12. metallic substrates, 13. heat radiation aluminum pipes.
Detailed description of the invention
A kind of carbon dioxide laser cutting cross-cutting board of the present invention stitches the real-time measuring and controlling device of wide image, comprise the secondary light source assembly being positioned at laser cutting head 8 lower end and the paraxial optics lens assembly being positioned at laser cutting head 8 side, wherein secondary light source assembly comprises support 9 and three secondary light sources 10, support 9 is fixed on the lower end of laser cutting head 8, three secondary light sources 10 are connected on support 9 and in being equally spaced, the intersection point of its emergent light is positioned on cut point; Described paraxial optics lens assembly comprises camera upper bracket 2, camera lower carriage 3, camera carriage 4, CCD camera 5, optical filter 6 and industrial telecentric lens 7, wherein camera upper bracket 2 is fixed on lathe fixed head 1, the lower end of camera upper bracket 2 arranges camera lower carriage 3, camera lower carriage 3 is arranged camera carriage 4, camera carriage 4 is connected CCD camera 5, the front end of CCD camera 5 arranges industrial telecentric lens 7, arranges optical filter 6 between CCD camera 5 and industrial telecentric lens 7; Wherein camera lower carriage 3 is flexibly connected with the lower end of camera upper bracket 2, and camera carriage 4 is flexibly connected with camera lower carriage 3.
Fix with hex(agonal)screw between described camera lower carriage 3 and camera upper bracket 2, fix with hex(agonal)screw between camera carriage 4 and camera lower carriage 3.
Described camera upper bracket 2 comprises horizontal segment 2-1, vertically section 2-2 and bending segment 2-3, this bending segment 2-3 is the lower end of camera upper bracket 2, wherein the angle of horizontal segment 2-1 and vertical section 2-2 is 90 degree, and this bending segment 2-3 and horizontal segment 2-1 is 45 degree at the angle of proj ected bottom.
Described secondary light source 10 comprises LED lamp bead and collector lens 11, metallic substrates 12 and heat radiation aluminum pipe 13, and metallic substrates 12 is connected in the end of heat radiation aluminum pipe 13, metallic substrates 12 is arranged LED lamp bead and collector lens 11.
Lamp pearl in described LED lamp bead and collector lens 11 is 380nm wavelength 3WLED, and collector lens material is PMMA, and lighting angle is 8 degree; The angle of secondary light source optical axis direction and horizontal plane is 25 ° ~ 35 °.
Described optical filter 6 is 380nm optical filter.
Stitch a detecting and control method for the real-time measuring and controlling device of wide image based on above-mentioned carbon dioxide laser cutting cross-cutting board, comprise the following steps:
Step 1, determine wavelength window, the spectrogram at cut point place when detecting carbon dioxide laser cutting cross-cutting board with fiber spectrometer, and by analyzing the curve of spectrum, choose 380nm wave band secondary light source and optical filter;
Step 2, camera calibration, be placed in standard calibration plate on telecentric lens focal length, carries out organizing shooting more, obtain the pixel average that target unit width is corresponding with industrial camera to it; Described standard calibration template number is CG-038-T-0.2.
Step 3, slot IMAQ, aim at cutting zone with industrial camera, and make cut point be positioned at picture centre, the consecutive image comprising slot formed after shooting laser cutting;
Step 4, stitch wide detection, to the slot image obtained in step 3, add up obtain stitching wide pixel value corresponding in the picture by enhancing, filtering, binaryzation, opening operation, rim detection, area grayscale value;
The wide actual value of step 5, opposite joint calculates, and obtains stitching wide developed width value; The wide actual value of opposite joint calculates, and formula used is:
△V＝(1/k)△d
In formula, △ V is calibration voltage, and k is the ratio (k=d/V) of seam wide d and Z axis servomotor corresponding voltage value V, and △ d detects the wide d1 of seam and default difference of stitching wide d2 that obtain.
Step 6, stitch wide control, utilize and detect gained seam width values and preset the difference of stitch width values cutting head is controlled, realize stitching wide servo antrol.
Below in conjunction with embodiment, further detailed description is done to the present invention:
The object of cutting is that 18mm is thick, the birch laminate that book size is 1.22 meters × 2.44 meters.
As shown in Figure 2, secondary light source irradiates cutting zone, and CCD industrial camera gathers this area image, utilizes digital signal processor process in real time image and analyze, and extract slot width information, and combining camera calibrated and calculated obtains stitching wide data.
In the present invention, camera support and light source bracket are made up of stainless steel, while meeting requirement of strength, in cutting head motion process, ensure that obvious shake does not appear in camera and light source.Detailed description of the invention is as follows:
1) with the spectrogram at cut point place during Newport-OSM-400-UV/VIS fiber spectrometer acquisition carbon dioxide laser cutting cross-cutting board, by analyzing the curve of spectrum, thus the combination of 380nm wave band secondary light source and optical filter is determined;
2) angle adjusting secondary light source direction of illumination and horizontal plane is 25 ° ~ 35 °, relative position between adjustment secondary light source and the relative position of light source and camera, make uniform light, concentrated irradiation being about in the approximate circle of 3mm with the radius at cut point center;
3) adjust camera position, make camera lens primary optical axis become 60 ° of angles with horizontal plane, and make its projection in the horizontal plane and X-axis positive direction angle at 45 °;
4) before industrial CCD camera, install telecentric lens, telecentric lens is that 110mm focuses × 1.5 multiplying powers, and telecentric lens is equipped with filtering apparatus, and filtering apparatus is made up of specific short-wave band optical filter, with the interference of filtering 10.6 μm of Submillineter Wave Technologies and visible ray;
5) secondary light source adopts 3 380nm wavelength 3WLED to be equipped with collector lens and radiator;
6) gain coefficient of camera is adjusted to make the image light of collection moderate;
7) CG-038-T-0.2 model scaling board is placed on cutting plate, to it carries out organize shooting with camera more, obtain the pixel average that 1mm width is corresponding, be denoted as dp;
8) region consecutive image centered by cut point is gathered by CCD camera in the mode of paraxonic;
9) digital signal processor is utilized to be strengthened described cutting image by space domain method and carry out Kalman filtering;
10) in searching image, gray value is maximum point is bunch to determine cut point pixel coordinate;
11) choose suitable threshold value and carry out image binaryzation, by the further noise reduction of opening operation;
12) direction, gap is determined by edge extracting, determine the straight line also crossing cut point along direction, gap, the rectangle of the 10pixel*300pixel perpendicular to straight line is being chosen apart from cut point dp pixel place, gray value M in cumulative rectangle, the pixel value obtained apart from the wide correspondence of seam at cut point 1mm place is △ dp=M/ (10*255);
13) demarcation done before combination, obtains actual seam wide information d1=△ dp/dp;
14) experiment determines that seam is wide has approximate linear relationship with defocusing amount, i.e. relation linear with Z axis position, that is has linear approximate relationship with the magnitude of voltage of Z axis servomotor, can stitch wide d=kV;
15) thus calibration voltage △ V and detect the wide d1 of seam that obtains and preset relation △ V=(1/k) the △ d stitching the difference △ d of wide d2;
16) according to corresponding conversion rule, △ V is converted to 16 system ASCII characters, uses TL16C752B asynchronous communication transceiver, with RS232 working method, data are sent to DAC8562 module, generate corresponding voltage value to control Z axis servomotor.
As from the foregoing, the present invention can realize stitching wide real-time, online prosecution to carbon dioxide laser cutting cross-cutting board, and detection speed is fast, precision is high.
Claims (9)
1. a carbon dioxide laser cutting cross-cutting board stitches the real-time measuring and controlling device of wide image, it is characterized in that, comprise the secondary light source assembly being positioned at laser cutting head (8) lower end and the paraxial optics lens assembly being positioned at laser cutting head (8) side, wherein secondary light source assembly comprises support (9) and three secondary light sources (10), support (9) is fixed on the lower end of laser cutting head (8), three secondary light sources (10) are connected in that support (9) is upper and in being equally spaced, the intersection point of its emergent light is positioned on cut point, described paraxial optics lens assembly comprises camera upper bracket (2), camera lower carriage (3), camera carriage (4), CCD camera (5), optical filter (6) and industrial telecentric lens (7), wherein camera upper bracket (2) is fixed on lathe fixed head (1), the lower end of camera upper bracket (2) arranges camera lower carriage (3), camera lower carriage (3) is arranged camera carriage (4), CCD camera that camera carriage (4) is connected (5), the front end of CCD camera (5) arranges industrial telecentric lens (7), optical filter (6) is set between CCD camera (5) and industrial telecentric lens (7), wherein camera lower carriage (3) is flexibly connected with the lower end of camera upper bracket (2), and camera carriage (4) is flexibly connected with camera lower carriage (3).
2. carbon dioxide laser cutting cross-cutting board according to claim 1 stitches the real-time measuring and controlling device of wide image, it is characterized in that, fix with hex(agonal)screw between camera lower carriage (3) and camera upper bracket (2), fix with hex(agonal)screw between camera carriage (4) and camera lower carriage (3).
3. carbon dioxide laser cutting cross-cutting board according to claim 1 and 2 stitches the real-time measuring and controlling device of wide image, it is characterized in that, camera upper bracket (2) comprises horizontal segment (2-1), vertically section (2-2) and bending segment (2-3), the lower end that this bending segment (2-3) is camera upper bracket (2), wherein horizontal segment (2-1) is 90 degree with the angle of vertical section (2-2), and this bending segment (2-3) and horizontal segment (2-1) are 45 degree at the angle of proj ected bottom.
4. carbon dioxide laser cutting cross-cutting board according to claim 1 and 2 stitches the real-time measuring and controlling device of wide image, it is characterized in that, secondary light source (10) comprises LED lamp bead and collector lens (11), metallic substrates (12) and heat radiation aluminum pipe (13), metallic substrates (12) is connected in the end of heat radiation aluminum pipe (13), metallic substrates (12) is arranged LED lamp bead and collector lens (11).
5. carbon dioxide laser cutting cross-cutting board according to claim 4 stitches the real-time measuring and controlling device of wide image, it is characterized in that, lamp pearl in LED lamp bead and collector lens (11) is 380nm wavelength 3WLED, and collector lens material is PMMA, and lighting angle is 8 degree; The angle of secondary light source optical axis direction and horizontal plane is 25 ° ~ 35 °.
6. carbon dioxide laser cutting cross-cutting board according to claim 1 stitches the real-time measuring and controlling device of wide image, it is characterized in that, optical filter (6) is 380nm optical filter.
7. stitch a detecting and control method for the real-time measuring and controlling device of wide image based on carbon dioxide laser cutting cross-cutting board described in claim 1, it is characterized in that, comprise the following steps:
Step 1, determine wavelength window, the spectrogram at cut point place when detecting carbon dioxide laser cutting cross-cutting board with fiber spectrometer, and by analyzing the curve of spectrum, choose 380nm wave band secondary light source and optical filter;
Step 2, camera calibration, be placed in standard calibration plate on telecentric lens focal length, carries out organizing shooting more, obtain the pixel average that target unit width is corresponding with industrial camera to it;
Step 3, slot IMAQ, aim at cutting zone with industrial camera, and make cut point be positioned at picture centre, the consecutive image comprising slot formed after shooting laser cutting;
Step 4, stitch wide detection, to the slot image obtained in step 3, add up obtain stitching wide pixel value corresponding in the picture by enhancing, filtering, binaryzation, opening operation, rim detection, area grayscale value;
The wide actual value of step 5, opposite joint calculates, and obtains stitching wide developed width value;
Step 6, stitch wide control, utilize and detect gained seam width values and preset the difference of stitch width values cutting head is controlled, realize stitching wide servo antrol.
8. detecting and control method according to claim 7, is characterized in that, the template of standard calibration described in step 2 number is CG-038-T-0.2.
9. detecting and control method according to claim 7, is characterized in that, the wide actual value of step 5 opposite joint calculates, and formula used is:
△V＝(1/k)△d
In formula, △ V is calibration voltage, and k is the ratio (k=d/V) of seam wide d and Z axis servomotor corresponding voltage value V, and △ d detects the wide d1 of seam and default difference of stitching wide d2 that obtain.
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| CN201510585476.0A CN105108358B (en) | 2015-09-15 | 2015-09-15 | The real-time measuring and controlling device of carbon dioxide laser cutting cross-cutting board slit width image and method |
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| CN201510585476.0A CN105108358B (en) | 2015-09-15 | 2015-09-15 | The real-time measuring and controlling device of carbon dioxide laser cutting cross-cutting board slit width image and method |
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| CN106938370A (en) * | 2015-12-30 | 2017-07-11 | 上海微电子装备有限公司 | A kind of laser-processing system and method |
| CN106964907A (en) * | 2017-04-25 | 2017-07-21 | 重庆邮电大学 | A kind of method and apparatus of laser cutting |
| CN109986198A (en) * | 2017-12-29 | 2019-07-09 | 大族激光科技产业集团股份有限公司 | A kind of molten bath monitoring device of high power welding |
| CN110900011A (en) * | 2019-12-26 | 2020-03-24 | 中国科学院长春光学精密机械与物理研究所 | Online detection system of numerical control laser pipe cutting machine tool |
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