The laser frequency of MAG bath shows a vision to detect

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  • source:BREDA CNC Machining
Summary: MAG solders aborning received wide application. The article uses laser frequency to show visual detector to detect from test specimen front the MAG that gave clarity solders the bath region image that efflux transfers; According to the characteristic of image, the design gives image brim check to calculate a standard, detect went out to solder the whole brim of bath; Extraction gave bath the biggest width and bath are the biggest length parameter. This solders for MAG the numeric imitate of the process offers experimental test and verify, the automata that the process still can solder for the following MAG in the meantime laid solid foundation. Keyword: Laser frequency shows a vision to detect MAG solders efflux of bath region image transfers introductive vision sensor has intuitionistic, information content big, do not suffer solder the interference of electromagnetism field, of its information detect do not affect solder normally the advantage such as the process, soldering consequently the quality of the process detects study with pilot respect application is more. Because TIG solders the process is stabler, solder in TIG the quality of the process detects the outcome with was obtained better with control respect [1][2][3] . MAG solders is production in use extensively solder method, have welding line quality good, maneuverability efficiency of strong, production is advanced advantage, wide application solders with the robot at mechanization, and MAG solders almost but solder all metals [4] . But because MAG solders,the metal that very old rate exists in the process splatters, welding line appearance is relatively coarse, arc disturbs the defect such as not intense, aerosol, stable electric arc combustion, film very hard consequently the bath image of complete clarity, solder very hard also to MAG the numeric imitate of the process offers experimental test and verify. The Sun Zhengguo of Tsinghua university [the person such as 5] redesigned common industrial CCD camera to detect in order to use the bath during short circuit overshoots be disturbed without arc in Cheng too, the electric arc that in solving CO2 short circuit to transfer, exists and splatter the interference problem of pair of vision sensor. This article in pulse voltaic radical value always films the bath image when giving CO2 short circuit to transfer, bath edge is clear, but arc is disturbed still very intense, did not draw image margin. This lab uses laser frequency to show visual detector, use the illume of the laser inside short time, successfully disappear solders besides MAG the strong arc interference of the process, film gave clear, whole bath picture. System of test of 1 system model basically shows visual detector, welder by laser frequency, walk orgnaization, personal computer 1, personal computer 2, monitor composition. Graph 1 for block diagram of construction of system. Graph 1 system block diagram 1.

1 laser frequency shows visual detector by Control Vision Inc.

Company laser frequency shows visual detector is production, be used to detect process of high speed, high temperature. Laser light beam has monochromatic property, directional good, brightness is tall, obtain clear picture consequently. Laser frequency shows visual detector to shine pulse laser frequency light of sensor of vision of shutter of electron of technology, high speed, compound filter technology of processing of image of technology, computer is compositive at an organic whole, can overcome effectively solder the strong arc interference in the process, provide clear bath picture and geometrical appearance measure, provided much reliable information to solder to the process is analysed and be controlled. Laser frequency shows visual detector to be comprised by emitter of equipment of camera head, control, laser. This equipment uses the laser that laser emitter gives out to restrain the interference of electric arc light. The average power of pulse laser is 7mW, duration of laser of cycle of a pulse is 5ns only, inside laser pulse duration consequently laser pulse power can amount to 80kW. Such is in inside laser pulse duration, the energy density of laser is more than the energy density of electric arc light far. The electronic shutter of pickup camera and laser pulse are synchronous, because this bath is in,pickup camera restrains the interference of electric arc light effectively into the laser when resembling. Additional, the smooth way that resemble is become in camera have in the system add have the tape filter that matchs with laser wavelengh photograph, restrain the interference of other wavelengh light, the letter a confusion of voices that improved image further is compared. Bath is the liquid of melt, in bath area, laser produces specular reflection, not fused metal is all round bath, of laser happening is diffuse reflection, consequently area can produce bigger contrast all round bath area and bath [6] . Through these measure can obtain very clear bath picture. Advocate accuse the computer to undertake a series of processing to bath image, OK and reliable ground detects the appearance that gives bath and dimension. 1.

Personal computer of 2 jobs principle 2 main control walk the athletic way of the orgnaization and speed; By LaserStrobe control laser generator launchs laser, laser is transmitted through fiber-optic canal, illuminate arrives on workpiece, film by pickup camera bath image, show the picture that pickup camera place films in real time on LaserStrobe screen and monitor at the same time; 1 control collects personal computer the image frequency of this personal computer, save image. 2 detect result and image processing experiment use permanent current MAG to solder the method undertakes v. Solder material is mild steel Q235, dimension is 6mm of × of 200mm × 50mm, welding wire diameter 1.

2mm, protect aeriform 90%Ar+10%CO2, aeriform discharge 15L/min. Dry extend length 25mm, solder voltage 31V, solder voltaic 250A, solder speed is 300mm/min, 350mm/min, 400mm/min respectively, frit drop transfers the form transfers for efflux. Bath image is shown 2 times like the graph, y axis is direction of welding, x axis is vertical at direction of welding. Popularly, brim expression is the place with acuteness change of the gray scale on image. But because MAG solders an inherent characteristic, there is acuteness gray scale besides bath brim in films image outside change, there still is very much similar bath edge in other place " disturb " graph 2 filmed bath image the brim. This solders to MAG the extraction of bath image brim increased very great difficulty. To solve this one problem, article basis place films the characteristic of image, wove image analyses software by oneself, drew bath margin. Image handles algorithm to be as follows: (1) image increases. With F (x, y) , G(x, y) shows drop resembling element respectively (X, the value of primitive gray scale of Y) and the image after the gray scale after increasing passes processing are worth, enhance formula to be: Through processing the image after, its bath edge is nicer than before outstanding come out, more the extraction that is helpful for bath brim. (2) seek center. Bath presence is the largest frit is wide grow with the biggest frit, find bath center above all according to this one feature. (3) affirmatory area dot. In bath the biggest frit is wide with place of length of the biggest bath affirmatory bath is controlled and fluctuate 4 area dot. (4) search the brim. With bath dot of or so area serves as initial drop, on its 30 below or so resemble element inside, according to brim mutation this one characteristic, affirmatory bath controls the margin. It is initial drop with center, edge Y direction is searched to two side, in next area on bath the search inside the dot gives the edge of bath forehead and rear. Graph 3, graph 4, graph 5 be in different solder the bath image that films below speed (left) with the image after be being handled via this software (on the right side of) , its pickup camera films direction is perpendicular with direction of welding. (A) primitive image (the image after B) handles pursues 3 MAG solders filmed bath image solders speed: On image of 300mm/min3 parameter extraction each bits of brightness reflected dimensional object face some a little bit the intensity of reflex, and the geometrical position with this bits of as bit more corresponding as dimensional object surface position on image is concerned. The correlation of these positions is become by pickup camera decide like geometrical model place, the parameter of this geometry model calls pickup camera parameter. These parameters must be decided by experiment and computation, experiment and computational process call pickup camera to decide award. The demarcate thing that the article uses is homocentric rectangle, span is 1 millimeter between line segment of this rectangular photograph adjacent, each rectangle are homocentric and even distributing. The water that the parameter that needs demarcate is actual coordinate department and image coordinate department is gentle and perpendicular the coefficient of proportionality of two direction. Reach horizontal way (perpendicular with direction of welding) demarcate coefficient is 0.

0521mm/pixel, perpendicular direction (along direction of welding) demarcate coefficient is 0.

1316mm/pixel. To describe the geometrical figure of bath front, come out with formal expression of the number, heat up process computation to provide data of experimental test and verify to solder thereby, build parameter of appearance of bath front geometry and welder art the relation model of parameter, must extract the geometrical parameter of bath front. The main parameter that the article extracts is the biggest width of bath and the biggest length. (A) primitive image (the image graph 4 MAG after B) handles solders filmed bath image solders speed: 350mm/min(a) primitive image (the image graph 5 MAG after B) handles solders filmed bath image solders speed: 400mm/min uses the image that weaves by oneself to handle software, can detect piece spend and the biggest length. The bath that the greatest wide place that the bath when to solder speed changes expresses below measures is the biggest width and bath are the biggest length. The watch solders the bath when speed changes is the biggest width and bath length from on the watch can see: Bath is the biggest width as solder the accretion of speed and reduce, and after the change of bath length increases first, reduce. Solder rate increases, the effect time of on electric arc and workpiece each part shortens, some nods on workpiece solder hot input quantity decreases, bring about bath the biggest width is followed solder the accretion of speed and reduce; Solder on one hand the addition of speed, make the temperature gradient with electric arc rear axes is reduced, bath length has addition tendency, on the other hand some chooses work solder hot input quantity is reduced, make bath length has reduced tendency, after the result that combines function makes bath length increases first, both put together is reduced. 4 conclusion (1) use laser frequency to show visual detector front to detect gave clear, complete MAG to solder efflux transfers bath image. (2) the characteristic according to image, the design gives image brim check to calculate a standard, detect went out to solder the whole brim of bath. (3) undertook demarcate to bath image, drew bath the biggest width and bath are the biggest length. Analysed solder below the circumstance with the electric current in the process and constant tension, solder the bath when speed changes is the biggest width and bath are the biggest the metabolic rule of length. CNC Milling CNC Machining