Shallow the diagnostic modelling technology that talks about CAD

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When the engineer uses cartography of three-dimensional CAD tool, as the addition of use development and demand, can encounter such and such problem. If we increase understanding of a few basic to CAD technology conceptual, can conduce to us understanding design tool itself, a few your people's obscure problem avoids to happen in devising working detail. SolidWorks company rolled out SWIFT technology 2007, this is a very advanced technology. Company of the closest SolidWorks in its the technology did the SWIFT of software lieutenant general of 2008 new edition to be strengthened further again. The similar action that still has Pro/E builds modular technology, and these are the outstanding technologies that develop over the foundation and come from diagnostic modelling. Review CAD technology to develop the history, going up century the CAD technology during 60 time is given priority to with modelling of line draw a frame round, the software system of its representing is CADAM, the technology grows 70 time, CAD technology is given priority to with curved surface modelling, representing a system is CATIA. On century the CAD technology during 80 time is given priority to with hypostatic modelling, be like I-DEAS. Arrived to go up century 90 time, CAD technique goes in front for diagnostic modelling technology of the representing with Pro/E. And henceforth is up-to-date, return completely revolutionary without a kind breakthrough. About diagnostic modelling, we can understand above all " feature " concept. To the feature, did not unite accepted concept. Wraparound tell, it is geometrical feature and project feature is compositive, namely geometrical information, project information reachs his to depend on a relation (make news) compositive. The feature has a variety of, transfer for instance feature, draft feature, protruding stage feature and fixed position feature. And in diagnostic concept so called depending on a relation is diagnostic modelling and hypostatic formative the biggest distinction, diagnostic model record the historical course that builds a model, and hypostatic model system only record final modelling result. Principle of diagnostic modelling technology basically includes to depend on relation, develop to attack ID date, diagnostic tree and feature are newer wait for a few points. In diagnostic model system, can have between geometrical body depend on a relation. is this kind depends on a relation, became the key that defines a feature. Depend on a relation to be able to be divided for type of explicit, concealed two kinds big. Give parameter, go up in fixed position plane and wait for fixed position axis with some line depend on a relation to attribute explicit significance, and transfer some edge (Edge) , be in a certain (the stiletto on Face) and through an acme (Vertex) depending on a relation is concealed type relation. Explicit relation is defined easily by us, but concealed type relation is defined criterion otherwise. In system of traditional feature model, concealed type relation is to use develop to attack of the element permanent name a mechanism to come true. Accordingly, permanent the core technology that naming a mechanism is system of traditional feature model. In molding process, hypostatic dot, edge, range is made automatically, to it associated develop attacks ID date is not a simple number. We have index of a few requirements to its. It is develop attacks above all the uniqueness of ID date, attack in every develop in diagnostic system namely the element has exclusive ID number. It is consistency next. Consistency reflects the number at the in replacing a process ID in the feature to want to keep consistent from beginning to end. Because we attack to develop,ID date had the demand of above, can come true we introduce it the purpose in the model, solve the dependence between the feature namely concern issue, when implementation model is changed, be opposite of the feature newer. Develop attacks the principle of ID date is name with what the face is a center. In Boer operation process, the range is relatively stable, if do not calculate,incorporate, do not have new look unfamiliar to become; Dot, edge basically can distinguish with the face; Of most face name can decide according to creating a condition. We can cultivate reaction to depend on a relation through the feature. After a diagnostic happening changes, the feature needs to calculate again. Here has a newer principle, namely child after all father feature of the feature is updated, this child diagnostic ability is updated; The newer failure of either father feature, its child of the feature all be considered as newlier to fail. In the inchoate version of Pro/E, to diagnostic dependence the relation is existing the mistake on detail, cause originally only pictures attacks after ID date is revised through the model, cannot mix new ID photograph is completely corresponding. The technology of SWIFT(SolidWorks Intelligent Feature Technology) of SolidWorks basically includes diagnostic expert (Feature Expert) and draft expert (Sketch Expert) uses a function twice. FeatureExpert faces more and more feature parameter in designing a process and concern, as a result of,can come up against in designing a process often the diagnostic parameter that the design is revised and makes sequel numerous and relationship appear a series of the problem such as warning and mistake. SWIFT is good fortunately will original a lot of transfer the measure of the operation concealed went, make an operation more simple. The order that transfers so differs to bring about interim result possibly to differ. Hand of the person that Expert avoids to let use is moved transfer circular arc, software will help you automatically choose to transfer order, assured to transfer the validity of the result, improved efficiency at the same time. There still is a serious problem in CAD application is standard problem: At present CAD standard basically has two: One is 1979 American country Bureau of Standards (NBS) made geometrical information exchange a standard (IGES) . Another is 1988 the product information that international ISO issues exchanges a standard (STEP) . Home is opposite for a time the hope of STEP is very big. But the definition that STEP realizes way without the feature, attack without develop the definition of ID date, this is a of STEP hard injury. Self-identity also expresses to this problem when the United States standardizes the official Pratt of the bureau to be visited to Beijing. How to turn the information building a model in CAD system in systematic B. The diagnostic information between system of current and different CAD cannot be exchanged completely. This causes very great difficulty to application. A case that for instance I know, when CATIA is in and the data between some CAE system undertakes transmission, as a result of platform of two systems geometry between the definition to curved surface each are not identical, lose in transmit to the certain feature of the model in CATIA so or be was amounted to by wrong the earth's surface. At present diagnostic modelling technology still has inadequacy. The error may be caused when for instance the feature rebuilds; To different CAD system, geometrical information can be exchanged, but diagnostic information is incommutable. Additional, to curved surface modelling, diagnostic technology also has trifling inadequacy. For this somebody put forward new trends to build a model to improve a technology. CNC Milling CNC Machining