Coordinate is measured machine (the task of a crux that the function calibrating of CMM) is qualitative guarantee system. Detect the influence of a variety of error sources that the result is had respective inaccuracy to be spent surely. Accordingly, decide correctly and quantify these error sources, it is to be evaluated correctly detect a when do not spend certainly main task. The article discussed to be in those who evaluate CMM to detect when inaccuracy is spent surely, 3 when how decide CMM important subsystem (scanning of circumgyrate workbench, contact measures head and video to measure a head) detect the bulk that does not spend certainly. 1 foreword coordinate is measured machine (the function calibrating of CMM) undertakes detecting will come true to its through pressing relevant international standard commonly, this is contemporary a of guarantee system of production company quality main job. To decide the error of the instrument is characteristic, people developed all sorts of different technologies, include to be begged instead among them technology and from demarcate program. Already a few document are mixed to the demarcate of CMM measure function to detect special program has undertaken discussion, also somebody studied the dependability of CMM demarcate. Current, use at detecting on the market the global basis of CMM is standard of ISO 10360 series. These standards can be regarded as to be on industry standard requirement of the fundamental sex to measuring traceability, versatility. People also realises clearly, measuring equipment to accord with standard of ISO 10360 series to measure active traceability to ask to satisfying CMM is insufficient, requirement of this kind of traceability passes special inaccuracy to be spent surely only evaluate ability to achieve. The apparatus that sets in standard of ISO 10360 series is checked and accept detect and test and verify detects mirrorred merely measure concerned partial inaccuracy to spend an element surely with coordinate, this is the integrality in information and detect the result that balance compromises between cost. Nevertheless, these local news comparative normally true, according to the viewpoint of probability theory, they can become a CMM to measure a condition to fall in the regulation actual and overall a kind of when measure performance very good index. 2 in detecting beforehand of the methodological CMM function that appraise inaccuracy spends surely rise ceaselessly and between CMM manufacturer, demarcate increases the competition of drama increasingly between service provider, to detecting the improvement of the program raised a requirement. Be necessary to be opposite especially with detect the does not spend a concept to have deeper person certainly accord related the program understands. Detect the result can be caused detect the influence of the error source that does not spend certainly. Accordingly, the measurement that is detected to reach correctly the biggest concessional error that equipment sets (the accordance of MPE) or not accordance conclusion, be necessary to be not spent certainly to detecting undertake beforehand appraise. Because involve economic increase, this job is crucial. In the one part content in standard of ISO 10360 series, clear also list is clear and true evaluation and detect the requirement that the inaccuracy related the process spends surely, in will detect when result and corresponding the biggest concessional error undertake comparative, the inaccuracy that must consider to detect according to the regulation of ISO 14253-1 standard is spent surely. However, for beforehand the inaccuracy that appraise detects is spent surely, the element that correctly affirmatory influence inaccuracy spends surely is not a footy job. In coordinate the error cause that there is all sorts of differring in measuring, can undertake to them according to different method beforehand appraise. But must remember well, our measurement the task is to be in what set strictly to measure what CMM evaluates below the condition to measure performance. These measure conditional part to be set by applicable standard, the write one's own ticket inside the rated target range that declares in CMM manufacturer by CMM user partly. Actually, in typical CMM measures the task in, most error source (the geometrical error that is like CMM, repeatability error, exploration error) the inaccuracy in all detecting as CMM spends an element to try to consider surely, because these errors are the biggest concessional error with correspondence (MPE) undertakes relative detect result itself (if indicate an error) one part. Detect to CMM the measurement of the process and to machining a spare parts detect the process is completely different. This kind of different point is mirrorred on the definition that is measured directly, should be measured to be by the in detecting, is evaluated CMM in the regulation the error comes denotive. In CMM check side beforehand the method that appraise inaccuracy spends surely also depends on detect the goal that program place should achieve. Detect in what what describe in standard of ISO 10360 series, it is to be used at the evaluation achieving the overall performance that appoints the CMM when measuring the task, is to evaluate a specific component not just (wait like workbench of rear sight, exploration system, circumgyrate) function. Actually, to the user, the error that specific CMM subsystem causes comes out from the depart in other error and do not have how old good (of course, to the production of CMM, maintenance and demarcate, the circumstance differred completely) . According to this one train of thought, in CMM detect in the process, any errors that cause by CMM component decide nonfeasance inaccuracy spent influencing factor and try to consider, the error that although be in check side,is evaluated is a kind of different error (if be in,circumgyrate workbench detects medium exploration error) . The error source that generates because of environmental element to discern correctly, specification beforehand the method that appraise inaccuracy spends surely is weighed particularly should. Fuel factor is reached to the overall performance of CMM detect the result is restricted to be affected greatly definitely. The CMM error that by the temperature inside temperature and formulary limits change causes is machine of quantity of this coordinate side the typical error that arises in the metropolis when executive Ren Ece is measured; These errors are included in check side result, measure strategy what change in the light of temperature through adopting appropriately, with respect to the amplitude that can reduce these errors. Serving as inaccuracy to spend the fuel factor that will consider surely is to point to the fuel factor with those and check sorrowful direct and relevant equipment merely (if be expanded by the heat with fiducial demarcate) , and with detect the hot Zhi that the program concerns stands. Afore-mentioned methods already were used at formulate a new ISO document (ISO TS 23165 " coordinate is measured machine detect the evaluation guideline that does not spend certainly " ) . This file is used at processing to be in ISO 10360-2 standard (the CMM of the description in be being used at the CMM) that dimension measures is the most important detect the inaccuracy of the program is spent surely. Keep consistent to narrate a method with place, the standard of the consideration needs when be being used at detecting certainly to be not spent certainly error source that recommends here is to be based on " detect square " responsibility. This is meant, have those only by detect equipment and carry out detect " detect square " the error that the decision causes just should give consideration. Article key discusses detecting 3 important, the CMM subsystem that was not covered by the standardization work place of the near future (circumgyrate job closes, contact scanning measures head and video to measure a head) when, how to decide spent influencing factor. These CMM components to contemporary make the importance clearly that measures a technology. Of 3 circumgyrate workbench detect inaccuracy is spent surely use at CMM the circumgyrate workbench of four-axle is to be used at detecting circumgyrate semmetry workpiece (wait like rotor of compressor of gear, helix) extremely valuable tool. According to the diverse demand of the user, circumgyrate workbench already OK and compositive in the workbench to CMM, also can serve as an independent hardware to be used when need. When undertaking metrical on the CMM that contains circumgyrate workbench, what its quality assures to rely on the regulation in ISO 10360-3 standard is special detect. 2 check mark is installed to follow a ball on the different height of circumgyrate workbench, undertake to its in different angle position series is measured 28 times. Detect the installation circumstance of device. The center of every standard ball is fastened by workpiece coordinate medium radial, tangential with axial 3 directions decide. The demonstrative error that computation gives 3 direction to go up (FR, FT and FA) , go up as every direction the biggest the interval with the least measured value. When considering to be not spent certainly according to ISO 14253-1 standard, if indicate an error to all not be more than corresponding the biggest concessional error (MPE) , criterion the measurement of CMM function can get test and verify. According to in front paragraphic the means that offer, a few potential error sources give out below, discuss them to be opposite mainly detect the influence of the result. (The commendation that the installation of 1) circumgyrate workbench and calibrating circumgyrate workbench must assure the regulation of the file according to quality and considers manufacturer the opinion will install debug. Its position and bear the weight of in the limit that the condition must set in manufacturer. The calibrating process that the calibrating program of calibration should measure with the typical CMM that takes circumgyrate workbench is same. The influence of these unit process of cargo bandling will be in with indicating the form of the error to include detect in the result, and detect inaccuracy is spent surely need not have consideration. Nextpage(2) objective is out of shape place is used fiducially detect device (standard ball and the clamping apparatus that prop up) may be out of shape because of clamping force and the effect that measure an exploration power. Clamping force may change the distance between 2 standards ball, but the material object that this is not dimension is standard, because this kind detects,do not need to pass the distance data of demarcate. We hope clamping force keeps constant in short time internal energy, to detecting the result does not produce apparent effect, the uncertainty of measurement that makes be caused by clamping force thereby is negligible not plan. The exploration power that measures a head may be caused detect device bends be out of shape, its affect size to depend on the tigidity with standard material object and exploration strategy. Reasonable design detects device and the influence that exploration strategy can make explore force reduce the level that can ignor. (Temperature of 3) fuel factor and the influence that temperature changes to measure performance to using the CMM of circumgyrate workbench come out through indicating an error to mirror, accordingly, need not beforehand the inaccuracy of the fuel factor that appraise and CMM concern is spent surely. To detecting device, should detect only just inputted temperature and heat to bilge coefficient (the data of CTE) uses his at amending detect when the result, just must serve as relevant fuel factor detect inaccuracy is spent surely and try to consider. This is meant, to a without temperature amendatory CMM character, all influences of fuel factor include to be in demonstrative error. Have temperature to amend a function to, but the CMM that the temperature sensor on instrument of have the aid of measures workpiece temperature, detect inaccuracy is spent surely bilge by heat the inaccuracy of coefficient is spent surely will decide, because it is by detect just will be in charge of. In expressing the 1 circumgyrate workbench in the model to detect, the affects each way demonstrative error FRFTFA that fuel factor does not spend certainly to detecting is in radial, tangential with the between fiducial ball distance on axial (Mm)4000200 fuel factor causes detect inaccuracy is spent surely (steel; The temperature in detecting changes 0.
When 1K; Standard inaccuracy is spent surely; µm)0.
230.
000.
12 well-known, fuel factor may be inaccuracy decides spent the biggest influencing factor. The watch shows the circumstance that just inputting temperature and heat to bilge to detecting is several data 1 times to fall, do not spend certainly to detecting beforehand appraise value. (The appearance of 4) standard ball this error source is to detect the definite influencing factor that does not spend certainly, its influence depends on measure strategy: A kind of possibility is to be in in workpiece coordinate department on exploration standard ball same point; Another kind of possibility is at measuring crankshaft in parallel the direction of the line explores standard ball. Advanced below a kind of circumstance, very small to spending an influence certainly; But below the circumstance that appears at the same time in two kinds of possibility, if use undermentioned formula to have consideration, may overmeasure the influence that it does not spend certainly to detecting: F2+u2(F) expresses U(ε Form)= √ 2 circumgyrate workbench detects do not spend source of error of influencing factor collect certainly detecting inaccuracy is decided whether does circumgyrate workbench error consider in spending (include to install debug and calibrating, position and bear the weight of conditional influence) deny other CMM error (include, f is the appearance error of the standard ball that passes demarcate. (The appearance that 5) bougie measures a needle is in of circumgyrate workbench in detecting, the appearance deviation that bougie measures needle and standard ball turns relatively because of workbench and the mutual geometry action of generation may be affected detect result. The method is narrated before the basis, be in only bougie by detect below the case that just provides, the appearance error that just can consider to measure bougie the needle serves as detect the influencing factor that does not spend certainly. Watch 2 gave out the circumgyrate workbench that above place discusses detects the collect that does not spend influencing factor certainly. 4 contact scanning measures a head detect inaccuracy is spent surely nowadays, more and more CMM configured contact scanning to measure a head, what adopted provision of ISO 10360-4 standard is special detect method. Should detecting is to be based on use different measurement what be opposite to pass demarcate with method of scanning of 4 kinds of targets is condition, spherical undertake metrical. Detect with scanning as a result exploration error Tij(is measured center and the radius limits between all scanning dots) will express, and the biggest concessional error with respective correspondence (MPETij) undertakes comparative. What do not spend influencing factor certainly to detecting is affirmatory and Baconian at the watch 3, explain as follows to influencing factor of wh some of which: Scanning speed: Its influence includes to be in scanning exploration error, because this need not consider its,do not determine spent impact to detecting. Measure software: Contact scanning measures a head commonly used at specific measurement the task (be like body of free surface geometry detect, appearance is measured wait for) , it uses module of a kind of special software. Meet sometimes the depart in measuring this CMM that special software uses normally from detect basically software comes out. For more bona fide control uses what scanning measures the CMM of the head to measure performance, the condition that CMM user should is close to his to use a case actually daily as far as possible comes down to carry out detect. Otherwise, must consider additional inaccuracy is spent surely, because use,different software may cause the change of CMM function. As an example, CMM is commercialized to go up in, the measurement that uses two kinds to differ software (homogeneous phase of other and all condition is the same as) what obtain in DIMEG is different measure an outcome. 5 video measure a head detect inaccuracy is spent surely since what inspect the geometrical system that surveys a proper to the course definition quite after measuring precision to achieve contact to measure the precision of the head, more and more CMM users are interested in choose video to measure a head. Well-known, when measuring a head to explore with optics, can generate a lot of add error sources (wait for) like the character of level of illume type, light intensity, lens, interaction with the workpiece that be measured. It is quite important also to measure strategy. As an example, measure in the distance in, different the effect that measures window size. Accordingly, optics measures a head detect inaccuracy is spent surely have more influencing factor. Reduce the minorrest rate to spend check exemple inaccuracy surely, use at check photometry the standard of head of cut up with a hay cutter (making in) will strict regulation measures a condition (include to measure politic) . 6 brief summary the article discussed detecting the important subsystem of CMM (scanning of circumgyrate workbench, contact measures head and video to measure a head) when, how to affect the error source that inaccuracy of check cut up with a hay cutter spends surely certainly. After li Qing Dynasty spends the method of influencing factor certainly, carry reasonable kind, can spend surely to inaccuracy undertake beforehand appraise. The consistency with formulary computation should be obtained through lab attestation approbate and realize standardization, be in CMM calibrating and detect undertake be comparinged adequately is opposite between service orgnaization. CNC Milling