Converse project technology is in plow the application in the arm is measured and building a model

When data collects executive condition to be designed in converse project technology, need collects three-dimensional data information from inside designing an object. Detect the development of equipment is a product of three-dimensional information get offerred hardware condition. Current, domestic manufacturer uses the more 3 coordinate that have the national production such as England, Italy, Germany, Japan to measure machine and three-dimensional scanner. With respect to principle of the structure that measure a head, can divide for contact and blame contact two kinds. Among them, contact measures a head to be able to be divided again to be measured forcedly the head is mixed soft measure a head two kinds, this kind measures an as direct as the object that be measured contact, get data information. Be not contact to measure a head apply the principle of optics and laser to undertake metrical. Be aimed at the characteristic with relatively complex figure of the face that plow an arm, the optical scanner that uses blame contact undertakes three-dimensional data is measured. The ATOS optical scanner that measures equipment to be German GOM company (the main good point of ATOSI600EU) this scanner is: Can circle the object that be measured to undertake video processor gets objective surface data moving using carrying classics data solely at will, sweep range can amount to 8m × 8m, measure precision for 0.

1mm0.

5m, scanning means is grating principle and principle of GPS fixed position. 2.

The scanning process that plows an arm above all, because plow brachial color to be dark gray, the basis measures a requirement to want to be in developer of spray of the surface that plow an arm; Next, because plow exterior figure of the arm relatively complex, because this cannot be over to plow one-time scanning of the arm in couples from an azimuth, need sticks fixed position point, when making sure in changeover each angle scanning plows an arm, can scan at the same time every time the dot of public fixed position of 3 above, the objective photograph after sticking a point sees a picture 2; Then, the basis plows brachial appearance, undertake many angle differ the scanning of azimuth, it is again in ATOS software, have every scanning picture automatically going all out closing through dot of public fixed position, finish the scanning of the whole appearance that plow an arm finally. Graph the 2 objective that plow an arm 3.

Choose the first treatment of the first treatment data of cloud data, be opposite namely the first treatment of bit of cloud, like noise purify, filter, suitable, reseau turns light etc. Data processing is the crucial link in converse project, its result will affect the quality that reframes to later period model directly. Measure the acquisition messy data that nod the cloud in the light of the exterior that plow an arm, apply special software to undertake the arm nods the pretreatment of cloud data plowing. 4.

The dot that deletes scanning of data of the messy noise that nod the cloud to get includes a lot of noise in the cloud, before like experimental stage underside these noise are undertaking all sorts of faces that choose a route are handled, answer to delete its. Will nod group of enlarge, commutation all sorts of angle with seeing the noise inside whole three dimensional space conveniently, the " in using software in the light of each noise dots next deletes " function to expunge its. 5.

Those who nod the cloud is compact the amount that collects a place in converse project technology is average very big, single width photograph can scan check the number can amount to 400000 most. The ongoing travel that so voluminous data needs to reframe in curved surface cuts processing, in order to raise operation rate. The external form plowing an arm that after the 3 courses after be being finished for scanning delete data of the messy noise that nod the cloud to cut processing, the graph receives orders cloud document. Graph 3ATOS scanner scans plow an arm primitive dot cloud 3, the processing of the data that nod the cloud and model rebuild Imageware software, its function is more powerful, divide outside having a variety of data processing methods and partial regulation feature to identify ability, still have automatic curved surface to plan to close, processing of powerful editor of curvilinear curved surface, model evaluates the function such as the examination, the data that can be aimed at different pattern offers the port that changes data pattern. Unigraphics(abbreviation UG) is the software of CAID/CAD/CAE/CAM high end that faces production industry currently. UG software makes the user can be digitlized the ground is founded and get three-dimensional product model, it is applied extensively at notional design, industry design, detailed mechanical design and project are emulated and be being digitlized to make wait for each domains. Be based on afore-mentioned advantages, rebuild in the data processing nodding the cloud to plowing an arm and model Imageware software and UGNX software were used in the process. 1.

Undertake handling to nodding cloud data with Imageware software (1) what nod cloud data to Qi Dianyun data is right neat it is the important segment that undertakes data processing. The initiative data that nod the cloud and we general three-dimensional coordinate department has certain included angle, build the three-dimensional geometry model that plows an arm for convenient form, need undertakes to nodding cloud data azimuth is opposite neat. Above all, need founds referenced datum plane, here, the Creat/Surface/Primitive/Plane function that use Imageware software provides is founded give 3 mutual and perpendicular plane, planar center is appointed for (0, 0, 0) . Next, need founds pair of corresponding neat plane, the basis plows appearance characteristic of the arm, random is chosen among them two of an aperture perpendicular plane regard pair of Qi Ping as the face, use Modify/Extract/Circle-selecPoints function this aperture the dot cloud of two perpendicular plane is broken up first come out, use Construct/Surface/from/Cloud/FitPlane function to plan to add up to these two plane next, in planning to combine planar course, want at any time the deviation between test point cloud and plane, ensure deviation is in ± 0.

2 ㎜ less than, in order to assure the consistency with prototype. Build the 3rd perpendicular plane for compose, the two plane that will plan to close are outspread to intersect, found cross a line, cross a line too on a bit, do on two plane respectively perpendicular two at crossing a line linear, found point-blank by these two next give the 3rd perpendicular plane. Finally, choose Modify/Align/Stepwise function to check the data that nod the cloud and referenced datum plane neat. To determine the position of aperture of two fixed position and size, usable and similar method mixes the 3rd of this aperture perpendicular plane spherical and 3 plane of another aperture and spherical plan to close, measure the distance that gets square hole for 12.

50 ㎜. (2) sectional line and the extraction of the borderline side its are sectional the extraction of line and its border line is the key that whole curved surface reframes. Above all, use ConstructCrossSectionCloudParallel function to nod the cloud to make necessary sectional line to plowing an arm, draft cut noodle cloud to synthesize a curve; Next, the extraction of 4 attrib border lines that uses functional ConstructFeatureLineSharpEdges to will plow an arm to nod the cloud comes out, draft cloud of attrib border dot to synthesize a curve next, so that construct free curved surface. To ensure sectional line is mixed the precision of attrib border line, the procedure is established in the compose of an any sectional lines and boundary boundary line in, want at any time the deviation between test point cloud and curve, ensure diagnostic line is in ± 0.

Inside 2mm deviation limits, in order to assure the consistency with prototype. Graph the 4 sectional feature curves to plow an arm and its border line. Graph the 4 sectional feature curves that plow an arm and its border line (3) curved surface plans to add up to position of curvilinear direction, will initial drop to be revised functional ConstructSurfaceLoft can be used to undertake curved surface plan to close after agreeing. This function basically is to use a group of independent 3D curves to found curved surface of a NURBS. Above all all curves that pitch on needs to plan to close, what select initiative site next is successional, choose tangent way, those who choose knot spot is successional, undertake curved surface plans to close finally. 2.

Build the model that plow an arm to read the * that takes Imageware software directly in UGNX software with UGNX software compose.

IMW format file, guide the curve that has built in the compose in Imageware, plane and curved surface in UGNX, afore-mentioned dot cloud can assure the consistency that coordinate fastens to neat measure. Because plow an arm,be to wait for a wall thick, measure the wall is thickly for 7.

70 ㎜, the curved surface that adds thick function exchange to enter has a system that uses UGNX software to offer add thick processing. Use the plane that plans to had closed and ball to face fixed position aperture to undertake reframing, as a result of position of ball heart center the likelihood is not on the central line of square aperture, undertake adjustment to ball heart position with respect to need, assure ball heart and coincide of position of line of square aperture center finally. Graph the 5 three-dimensional models plowing an arm that finish to be in UGNX software. Pursue the 5 three-dimensional models plowing an arm that finish in UGNX software 4, the analysis of error of three-dimensional geometry model that plows an arm plows an arm the error of three-dimensional geometry model basically includes by product model the error that collects generation of the data that nod the cloud, error that arises by the precision that measures equipment, by. Graph 6 to plow an arm three-dimensional model and actual measurement nod the cloud detect graph. From the graph 6 on we see not hard, apparent error often happens in petty and complex feature part, if the brim, groove is in, because these places cannot scan completely when measure, this gives later reframe bring bigger error. Graph 6 plow an arm of three-dimensional model and cloud of actual measurement dot detect graph 5, the last word uses ATOS optics the modelling function photograph with scanner, Imageware and powerful UGNX is united in wedlock, can undertake to complex product converse project is designed easily digitlizing. What converse project technology uses the development of new product, old part already extensively is reductive and of the product in detecting, it is digested not only and absorbed objective prototype, and can be revised design again in order to make a new product. But the system in designing a process at the same time is compositive change rate lower, the proportion of artificial interpose is large. Hopeful is formed in the future compositive change converse project system, change the inadequacy that will replace artificial interpose with the intelligence of software. CNC Milling CNC Machining