Modelling of UG advanced curved surface

1 preface uses CAD/CAM software to undertake three-dimensional model is the important implementation method of contemporary products plan, and curved surface modelling is the difficulty in three-dimensional model. We are engaged in the discovery in the process that CAD/CAM grooms, although showed some CAD/CAM software to provide function of very powerful curved surface modelling, but abecedarian faces numerous modelling function to feel not know what to do generally, often be software function had learned it seems that, but when facing real product, feel again do not know how to start. Even if the modelling personnel that a few have experience, because its study the issue in the process, often also use in modelling train of thought or function on put in a few errors, make product formative validity is mixed but * sex called a discount. Be aimed at afore-mentioned circumstances, the article discussed curved surface formative to study a method commonly from whole, and citing introduced curved surface formative common step. The function of modelling of numerous curved surface that formative of 2 curved surface learns a method to face CAD/CAM software place to offer, want to achieve a society inside shorter time practical formative target, mastering accurate study method is very necessary. Want to master economic model skill inside the shortest time, should notice the following: (1) should learn necessary ABC, include free curve (curved surface) tectonic principle. This pair of correctly understanding software functions and modelling train of thought are very important, alleged " grind a knife not to chop Chai Gong by accident " . Cannot understand correctly to also cannot use function of curved surface modelling correctly, leave snake in the grass to in the future modelling job necessarily, make learn a process to appear repeatedly. Actually, it is so difficult that the ABC that place of curved surface modelling needs does not have what people place imagines, wanted to master accurate tuitional method only, the student that has level of high school culture can understand. (2) want specific aim ground to learn software function. This includes two respects meaning: It is to learn functional avoid by all means to have an insatiable desire for much, all sorts of functions in software of a CAD/CAM are complex and diversiform, abecedarian often is immersed in among them cannot extricate oneself. Can use those who go up to be occupied only in real work actually among them very small one part, do not have necessary demand perfection completely. To a few functions that use inaccessibly, although learned to forget easily also, between unfruitful billow take time; On the other hand, to necessary, commonly used function should learn mainly, comprehend its fundamental and applied method truly, accomplish achieve mastery through a comprehensive study of the subject. (3) stress study model is basic train of thought. The core of modelling technology is formative train of thought, and do not depend on software function itself. The basic function of most CAD/CAM software very much the same, the operation that should learn these functions inside short time is not difficult, but when facing real product, feel again however do not know how to start, this is the problem that a lot of autodidact often encounter. This is just like learn fire, the operation of the firearms that its core technology does not consist pair of some model actually is same. Wanted to master formative train of thought and skill truly only, why to no matter use,plant CAD/CAM software can become modelling past master. (4) should develop rigorous working way, in avoid by all means learns in modelling and working " feel accordingly " , in formative the basis with each due and sufficient measure, cannot mix by the feeling guess undertake, otherwise entail untold troubles. Modelling of basic measure curved surface has formative of 3 curved surface type of 3 kinds of application: It is to start products plan formerly, build curved surface model by draft; 2 it is a basis 2 dimension blueprint has curved surface model, namely alleged blueprint modelling; 3 it is converse project, order mapping model namely. Here introduces the general implementation measure of the 2nd kind of type. Blueprint molding process can divide for two phase: The first phase is modelling analysis, determine correct modelling train of thought and method. Include: (1) the fundamental admiral product that pursues in accurate knowledge resolves individual curved surface or face series. (2) the kind that defines every curved surface and law of unripe set prescription, like straight grain face, unplug modular face or sweep summary face to wait; (3) decide the connection between each curved surface concerns (if pour wine cup, cut out etc) with connection order; Graph the product that 1 to in an attempt to shows 1 times pursues (for clear for the purpose of, blueprint gave out to be tagged partly only) for exemple, can resolve its 9 sides that in be a graph, show or face series. Among them face 1 for plane (tag by blueprint affirmatory) , face 2, face 3 it is two radius respectively for 100 with the round horn of 150 face. 4, 5 it is two faces group, namely by contour line of vertical view section (C of → of A → B and F of → of D → E) generate unplug for two times modular face. Face 6 it is the zero degree that GH of straight line segment makes unplugs modular face. 7 it is one changes to sweep summary area sectionally. The protruding stage of product coping sweeps summary area by (end face 8) unplug with modular face group (face 9) composition. Between group of each knead dough by connection of round horn, among them face 7 with the face 1, 2, the 3 round radius between are 15, and face 4, 5 with end face 1, 2, the 3 round radius between are 10, because this amid corner is in (I arrives A, j arrives F) have change radius (from 15 to 10) pour horn to transfer. The 2nd phase is formative implementation, include: (1) contour line of necessary 2 dimension view gives in the picture in CAD/CAM software according to blueprint, alternate each view real position of the space, if pursue,2 are shown. Graph 2 (2) the type that is aimed at each curved surface, the contour line in using each view finishs the model of each curved surface, if pursue,3 are shown. Graph 3 (3) according to the connection between curved surface the relation completes part, cut out wait for the job, if pursue,4 are shown. Graph 4 (4) part of the construction in the product that finish (hypostatic) modelling; Apparent, the first phase is the core that whole modelling works, it decided the operation method of the 2nd phase. Can say, before the first line is drawn on CAD/CAM software, had finished the model of whole product in its brains, accomplish " have a well-thought-out plan " . The job of the 2nd phase just is work of the first phases in some kind the report on CAD/CAM software just. Be in usually, curved surface modelling should abide by above measure only, a few specific implementation technologies mix recombine method, do not need extraordinary skill to be able to solve the model problem of most product. The method that the article introduced curved surface modelling to learn mixes 5 epilogue to undertake curved surface formative according to 2 dimension blueprint common step. Of course, still need to master a few basic technologies and method in specific implementation process, be like individual curved surface make, round horn. Still should understand a few common problems additionally (the polysemy problem in be like curved surface modelling) how to handle and avoid a few common errors (if unplug,modular datum plane is decided really) . These content we will introduce stage by stage in the following article. Although the measure of curved surface modelling that article place introduces looks simple, but should master it truly, still need to be experienced ceaselessly in practice and rise. CNC Milling