The ground of the use force of machine vision -- contemporary automobile manufacturing industry

Identify, read a code, but date from sex as system of national car recall come on stage, how realize a product effectively but date from sex already became urgent matter. Photograph comparing is used at a form of commodity identifying to pile up, 2 dimension code includes information more, then, the enterprise takes the way that makes yard of on 2 dimension for main component further, wait for a number that its include, batch important quality information, via reading head identifying collects evacuation to come the server of central monitoring room. Next, each assembly mixes recombine truckload a form code that go up, once have need, can inquire conveniently, undertake the quality date from of specific aim well and truly. And reading head piles up to 2 dimension unscramble, used the pattern recognition function of machine vision just about. In addition, take the 2 dimension yard on workpiece through reading, controallable still manufacturing operation and exercise process. For example, the bearing archives of engine cylinder body and the plain bearing liner that press, those who use is form of choice outfit prescription, namely both is pressed measure a result to undertake in group (group of general component 3~5) , next one to one correspondence the ground undertakes press fitting. To increase production efficiency is mixed put an end to wrong outfit, in the 2 dimension yard that makes in place of finished product cylinder body, included file of 1~5 plain bearing liner (if be 4 crocks of engine) group fasten information. Move to be versed in to some on motor assembly line when workpiece when, the reading head of the setting reads a code automatically namely, labour outside number of side basis set has 3~5 to discharge Cheng Fang to differ chamfer of group of other plain bearing liner, forehead has one indicator light. The press fitting that presses 1~5 is ordinal, operate a worker to hint according to indicator light, the plain bearing liner that takes out correspondence puts bearing shelf, apparent, twinkle of other indicator light early or late on behalf of different group depend on read the issues after pertinent information control signal in taking 2 dimension to pile up. 2.

The dependability that improves operation produces project of conditional dirty estate to forestall lot (be like: The ship-fitter foreword of car engine) fault of spare parts of occurrence such as is installed / leakage outfit, installation is less than an etc problem, must raise the dependability of exercise. Build differentiate in machine vision on functional foundation all sorts of having of specific aim identify a system automatically, quite effective to raising exercise dependability. Cite 2 typical case below. 1.

Piston - the main link that connecting rod component should identify a system automatically in the assembly inside cylinder body is: Judge cylinder body to whether already reached the designated position above all, and ready-made, its method is upper edge of exploration cylinder body (accurate the mark that reach the designated position) , if did not discover part of this spy a note of the ancient Chinese five-tone scale, issue alarm signal namely. Next, right the following 3 content undertake discriminating automatically: 1.

Of the piston have without; 2.

The validity of piston position (be being told exactly is " Zhou Xiangfang " ) ; 3.

The label of piston coping surface and character (use at indicating model, choose the group when matching not to reach other relevant meaning) whether to agree with the cylinder body of installation. Whole identifying the process is as follows: Engine is retroflexioned, load a piston, carry a system to make engine follows tray to identify worker displacement automatically to move; When engine is about to arrive, identify its by head of reading of 2 dimension code first " the identity " , signal next to PLC; Once engine arrives to identify worker worker automatically, be close to switch to spark, PLC gives out the job to dictate to machine vision system. If the piston already was put,be inside cylinder body, its mark and the model of character and requirement, group is fastened wait to agree completely, and assemble correct, namely " Zhou Xiangfang " inside formulary limits, criterion visual system post a letter gives PLC, your below engine flow direction one labour. If the piston is assembled wrong, criterion PLC of visual system clew, call the police through man-machine interface, the piston that indication screen will indicate which crock is assembled have by accident and belong to why to plant mistake. After handlers knows other outcome truly, issue a statement to PLC through man-machine interface, and carry engine directly have repair to repair area. Whole detect the process is finished automatically entirely, just compound an error in occurrence outfit, give out the ability when calling the police by artificial interpose. Graph the identifying that 1 piston puts positional validity the validity about piston position, namely " Zhou Xiangfang " meaning, if pursue 1. In piston bottom (white figure) upper part has an arrowhead, it must be located in graphic representation position, be in namely with the cylinder body that is put (black figure) the position with the central line consistent photograph of 4 crocks aperture. Under probe of vision of piston park machine when, through round casing comes whether does differentiate arrowhead lie proper place. 2.

The daily output that all sorts of cars examine to use lamps and lanterns before car light leaves factory often is as high as thousands of. Before the product leaves factory examine to include differentiate commonly of 2 screw directional, determine twist deepness (claimed accuracy is achieved 0.

1mm) , ask to check plastic gasket, block water piece, and whether is spacer installed correct, still ask the record is engraved imprint in plastic a product model that go up. For this, adopted have 4 to photograph the machine vision system that resembles a head, they all are installed in assembly line upper part, before 2 those who photograph screw of examination resembling a head is directional reach twist deepness, the 3rd checks washerbed down the livestock, block water piece, the spare parts such as spacer, the 4th is read take spare parts type. Graph the workpiece that 2 belts identify a mark photographs place resembling a head 4 times to read extraction picture to send toward a PC to undertake handling judge and indication a result. To avert interference of outside veiling glare, this system uses LED lighting installation. Cast in testing system of this machine vision before using, the enterprise needs 2 inspector every classes, every examine cost 30 seconds, and have bigger error. Full-time inspector needs no longer after using, examine rate rises greatly, every are cost only 5.

5 seconds, accident rate also falls to 0. 3.

Improve the manufacturing industry of flexible and contemporary automobile of production process, especially car company, its develop way is to use much breed, flexible the pattern of the production that confuse a line that change, and a when workpiece identifying technology realizes mode of this kind of production namely important segment, issue interview illustrate. To be in on a transfer matic in the meantime production belongs to 4 kinds of of 2 kinds of engine different camshaft, adopted the method that the mark makes between the second gear journal that appoints in workpiece, the mark is to machine the 1~4 path clitellum between the axis beforehand, represent the camshaft of 4 kinds of types respectively, graph 2 it is 2 kinds among them. Graph 3 visions system enters some process in workpiece to the identifying of workpiece (those who be like camshaft is final detect) before, the photoelectricity vision sensor that installs on the line will take afore-mentioned signs through reading, undertake correctly discriminating to workpiece (if pursue 3) , issue corresponding control signal next, in order to execute different working order. For example, when the graph 2 medium camshaft are in enter eventually check is versed in before two labour when, measure integratedly machine the injunction that obtains with respect to meeting ground, call different program, with undertaking detecting correctly to this workpiece. Detect domain of another functional application detects is machine vision fundamental application, its and " differentiate " main distinction is former for ration, and latter is qualitative. Detect the function can behave the working mode that is a variety of configuration, apply to batch to produce a condition to fall, the need of the circumstance differs in contemporary automobile manufacturing industry especially. 1.

Nicety measures applied machine vision to undertake nicety is measured, build on the foundation that to be being measured the brim of object image detects, if pursue,4 are shown. Testing system basically is photographed by optical system, CCD like head and computer processing system (in the graph not indicative) wait for composition. Graph the illuminate of 4 parallel beam of light that measure systematic work sketch map to be given out by illuminant arrive to be measured of the object detect on place, course of its brim outline shows crepuscular composition learning lens to resemble the area in camera blast on CCD resembling face, classics computer makes the seat of outline of brim of the object that be measured is won after image processing. If make be measured,the object produces displacement, measure place of its brim outline again, criterion two positional difference is displacement quantity. Apparent, if be measured,two parallel brim outline of the object can are in same inside image, criterion its are both positional difference is relevant measure namely. What afore-mentioned systems suit to produce the work below the circumstance to large quantities of quantities particularly is online detect, be being measured especially object dimension when lesser, appearance is simpler, its advantage is more outstanding. Car electron product receives plug-in unit mediumly is a typical case, their manufacturing efficiency and precision of finished product dimension are taller, former can achieve minutely hundreds, and latter majority is 0.

The quantitative class of 01mm. Usually, the quality blemish of workpiece includes to insert a foot be out of shape or screwy, redundant metal conglutinate (the metal is drossy) wait, all reflect the error that is over all dimension. Should adopt a plan when 4 show a system to undertake metrical, as a result of the spare parts (insert a foot) formation picture has sharp contrast between as bright as its setting, present the silhouette effect that gives clarity. This is accurate measure the outline that be mixed by the dimension of check object (appearance) special a note of the ancient Chinese five-tone scale created a condition. Graph of 5 models be in a poor light detect image pursues 5 showed figuration of one part punch insert a foot to be versed in through detecting as metallic conveyer belt when the model of generation is in a poor light image. Among them, the A that insert a foot produced twist, adherent and redundant metal is stuck on the B that insert a foot, dimension of section of the C that insert a foot (wide) unqualified -- these attribute common quality flaw. Another example that undertakes with machine vision nicety is measured is measuring instrument of cutting tool preliminary adjustments. Detect traditionally means is optical and umbriferous with grating number the photograph that show a list is united in wedlock, former use at pointing fixed position, and latter is used at measuring, reading. Whole process needs to be participated in morer artificially, tall to operating personnel to ask, efficiency is not tall however. The measuring instrument of preliminary adjustments of novel cutting tool that is born a few years ago, wait for technology of soft hardware of technology of machine vision, grating, computer, automata organic union, no matter measuring precision, operation,go to the lavatory and had on work efficiency rise revolutionarily. Its are main the optics that the reason replaced a tradition with machine vision namely is umbriferous, changed original work pattern thoroughly. In this kind of novel instrument, the Z axis that regards motion as slideway, X axis and C (circumgyrate) inside the axis, mix of linear grating respectively round grating, line of center of revolving stage of edge of the cutting tool that be measured, namely C axis installation. Machine vision sensor is located in furcate bracket two side, also namely, span the central line of revolving stage. The one aspect of the matter of bracket puts illuminant, another end is to photograph resemble a head, the image of the cutting tool that be measured by photograph read like the head take. 2.

Workpiece surface blemish detects workpiece surface blemish, for instance connecting rod differ in roll end diameter combines the crevasse of the face to be short of caustic is formed in production process. Up to now, the industry waits in the car that batch produces, autocycle, internal-combustion engine, basic to the exploration of exterior blemish it is means of artificial range estimation. This law not only efficiency strength of low, labor is great, and the mensurable assess that sets in standard of accurate executive craft hard, affected the effective monitoring to product quality. Graph 6 testing system comprise what combine an aspect with connecting rod is big aperture to explode the mouth is exemple, the specific requirement of its criterion for evaluation is as follows: 1) crevasse area is less than 3mm2, 2) the linear length of crevasse either direction is less than 2.

5mm. Want to accord with an afore-mentioned conditions only, will decide unqualified and by eliminate. Must point out, the transmission means that system of vision of the machine in be being measured with above nicety uses (say again " be in a poor light " means) different, exterior blemish is explored need to take reflection kind. Right now, the system passes illuminant of diffuse reflection of LED of type of a quadrate casing to enlighten wait for detect the crevasse area of workpiece, radial illuminate arrives after object surface, reflection arrives photograph go up like the component of photoelectricity coupling CCD inside the head, change into corresponding n signal namely, image processing system has analysis and consideration to gotten picture according to n signal, get finally what requiring data. The place before be like is narrated, CCD component can understand the lattice that is to be comprised like element by sensitization. Its resemble element every one to one correspondence the 2 dimension image of the object is special a note of the ancient Chinese five-tone scale, the image spy a note of the ancient Chinese five-tone scale that resembles the analysis of the result can analysing an object secondhand through be being nodded to resembling element namely. Become mediumly through changing image to 2 values for instance resemble resembling element the computation of several, the length that can get corresponding boy or girl friend is worth knead dough to amass a value. With connecting rod combinative scale explodes the mouth is exemple, the basis is measured of the object special a note of the ancient Chinese five-tone scale (the workpiece appearance, place that be measured) with the requirement, need to detect respectively the A-B-C 3 that each other is 15 ° included angle (connecting rod lateral) crevasse face, detect finally with 3 the real value that as a result medium maximum regards crevasse as, undertake judging and output a result. Accordingly, the testing system that if the graph is shown 6 times,formed, it basically includes: 1.

CCD is photographed like the head; Use at collecting crevasse image to be changed into digital picture signal. 2.

LED illuminant; Use at offerring stable, even illumination, assure to take like quality. 3.

Image handles unit; Its but according to need, the image to be being collected undertakes processing, analysis, at the same time the state information analytic result and image system passes RS232 interface to be passed to PLC. The MultiCheckerV110 below systematic use pine is embedded image processing system, market image processing and output are an organic whole. Embedded the characteristic of image processing system is processor bulk small (8.

4 × 4.

0 × 12cm) power comsumption is low (24VDC, 0.

7A) , and environmental suitability is good, can be in environmental temperature works continuously below the condition of 50 ℃ . 4.

PLC; It controls whole testing system the execution of each function, the data that also processes unit to be passed to image at the same time has desired result and judgement. This system chooses the S7-226MX of Xi Menzi company. 5.

Inspect is shown implement. It serves as interactive interface, the condition of indication image processing system and data analyse a result. 3.

Machine vision is detecting the applied car automobile body in free curved surface and its are enclothed (weldment, stamping workpiece) submit form of free curved surface mostly, come for years, detecting to theirs basically is to use coordinate to measure machine. Measure efficiency to rise, produce the monitoring of the process considering aggrandizement opposite especially, go up oneself 90 time metaphase has the century, use advanced optics to measure a system to be carried out in the spot online detected means gradually arisen, and the child that this kind of burgeoning measurement unit is laser sensor and union of machine vision photograph. The working principle of optical measurement unit is triangulation law. The light that gives out by semiconductor laser passes focusing, illuminate is being measured substance appearance, its reflex resembles lens through becoming, into the CCD area that resembles absorbing unit at image blast go up. According to the principle of triangulation, when datum plane of deviate of the surface that be measured, become in what image accepts parts of an apparatus to go up also will produce corresponding deviate like the dot, can get face of the workpiece that be measured accordingly the real value of different position. Afore-mentioned laser visions measure a course to develop for years, already from inchoate and main use Yu Yiwei dimension and space detect, enter three-dimensional measure, but its job principle still is triangulation law. Of course, measure than using 3 coordinate machine detect the free curved surface of workpiece, the repeatability R that laser vision measures and precision AC want low much. because of this, they basically are used at online detect, through efficient, fast 100% measure and undertake to actual measurement value statistic is analysed, implementation produces the quality monitoring of the process to trends. CNC Milling CNC Machining