The key with mechanical compositive CAD/CAM in recent years, the CAD of mechanical industry, CAM got rapid development, by earlier " swing plate " treatment of design, manual process designing is changed to higher administrative levels. Domestic and international a large number of fine CAD/CAM business enter production industry with software and product, ceaseless and perfect, the function is powerful with each passing day, those who promoted rate of manufacturing industry automation rise. How the system that the framework fits him business, it is the problem that puzzles mechanical manufacturing industry all the time. The article offerred thought of a kind of design and concept, height of implementation enterprise CAD/CAM is compositive produce with automation. One, CAD/CAM system is comprised as computer sex function rise and of the price reduce, the system that gave priority to with big, medium-sized computer and workstation in the past is changed to network, miniaturization and microcomputer. Core part is to go up seat number (personal computer) , join with next seat numbers through the network. Use as the personal computer that CAD designs conveys treatment information to numerical control machine tool and 3 coordinate measuring instrument, form unifinication data system, implementation CAD/CAE/CAM/CAT is compositive change. 2, the CAD layer that the key of CAD layer is in upper reaches is in of CAD/CAM compositive in having decision effect, want implementation and downstream CAM (include CAPP) implementation is compositive, the design of CAD should have 3 functions: (one) three-dimensional and hypostatic modelling is three-dimensional and hypostatic modelling was to experience modelling of three-dimensional line draw a frame round, three-dimensional surface modelling hind development rises use at depicting a part the model of information of the most complete geometry, the develop that recorded the point with full spare parts, line, face, style attacks information. Can undertake disappear concealed, apply colours to a drawing, analyse is cut, finite yuan reseau differentiates and contrail of NC cutting tool is generated, emulate etc. Three-dimensional and hypostatic model expresses to use geometry commonly tectonic law, attrib border notation and scanning notation. 1, law of hypostatic geometry construction (CSG) : It is a kind of element that use system spells the method that closes constituent put oneself in another's position, the form that can use a binary tree has a description to the spare parts. The advantage is a description the object is very compact, defect is the description on has restriction. 2, attrib border notation (B-rep) the information cent that wants expression is two kinds. One kind is geometrical data, reflect object size and position, another kind is develop attacks information, the relative position that describes an object affects. The advantage is to be able to construct the object that has complex appearance, defect is memory the amount is large, must offer a convenient user interface. Accordingly now almost the input interface that all systems that are a foundation with B-rep have CSG kind. 3, scanning notation: The athletic contrail that uses 2 dimension body and him normally will compare the object that shows scanning, cent scans to translation scans and rotate. (2) parameter turns model: Parameter turns model is new generation intelligence is changed, compositive the core content that changes CAD system. Parameter changes design technology to become initiative design, product to build a model to reach with drive of its strong draft design, dimension revise, the significant step that a variety of seriation design, plan devise with trends quite. 1, it is OK that parameter changes the method that build a model cent is 3 kinds of methods: The variable geometry law that is based on geometric constraint, artificial intelligence law that is based on geometrical inference and be based on the process construction way that makes course. 2, the parameter that is based on a feature changes the key that build a model is the feature reachs his the variable of relevant measure, public errand changes a description. Include geometric constraint and develop to attack the mixture of the tie builds model, tie to build model and tie to seek solution. 3, object-oriented parameter builds a model: Object-oriented methodological since a kind of programming method, it is a kind of cognitive method. Object-oriented tie method should represent the geometrical news of the spare parts not only, and the develop that represents a part even attacks information. (3) diagnostic modelling: The feature is the design in the spare parts and the include information of project of complete spare parts construction unit that production phase can identify, the information related the description that is group and one spare parts assembles. The product of new generation builds a model to change modelling to be a foundation with parameter. Diagnostic cent is 4 kinds big as follows: 1, overall message: Use at describing a two total information, include semifinished product of code of diagnostic name, feature, material and quality. 2, geometrical parameter information: Include to constitute the geometrical parameter information of each hypostatic basic measure. 3, technical parameter information: Include the dimension public errand related to the feature, travel tolerancepublic errand and exterior surface roughness. 4, diagnostic construction information: The develop that includes to form diagnostic entity attacks position of information, base point and directional vector. The key with 3 compositive CAD/CAM: The CAD/CAM that says normally is compositive, with respect to information character, it is to show design and 3 software in production process are compositive actually, namely CAD, CAPP, NCP. Had not been opposite on international up to now CAD/CAM is compositive make unified definition. CAD/CAM is compositive it is to point to information and physical equipment of two respects compositive. The height that should realize CAD/CAM is compositive, should have the following factor: (one) the parameter that new generation is based on a feature changes the technology that build a model: The place before be like is narrated, have 3 requirements: Three-dimensional and hypostatic modelling, parameter turns modelling and diagnostic model. This is CAD phase place the requirement can be finished and offer whole project to make information place for succeeding activity indispensable crucial technology. (2) information exchanges a technology: The Gu island with development because software of the CAD on the history, CAM is first medium process is shown, those who brought about format of their data presentation is skimble-scamble, use the data switch between different system, different module to be hard to undertake, affected CAD/CAMd compositive, because current data offerred on this international,exchange a standard. 1, IGES exchanges a standard: IGES exchange standard appears earlier, software of very much CAD, CAM supports this kind of form, but this kind of format puts in 3 defect: (1) normative description content is geometrical layer, lack the project information that CAM place wants. (2) the changeover that every CAD system can realize a hypostatic subclass in IGES only, appear likely a pair much much, righter one, approximate or cannot change. (3) program of current most IGES processing does not support ASCII to pile up a format, need space is large. 2, STEP exchanges a standard: ISO of international Organization for Standardization announced product model data to exchange standard STEP 1988, solved the commutative problem of product model. STEP has 3 characteristics: (1) the applied field with wide support; (2) can convey complete product data, offer a variety of data to exchange means; (3) it has neuter mechanism, can become independent at thermonuclear and particular system. STEP standard divides class to carry out: File exchange, working format exchange, database exchange and knowledge base are exchanged. 4, the architecture with compositive CAD/CAM: The system divides an administrative levels to come true. Most below one manages a layer for product data, it is a foundation with the product model of STEP, offer form of database, job (STEP) 3 kinds of data such as file exchange exchange means. The access of these 3 kinds of data by DBMS (database management system) , module of working format management and systematic converter will come true. Intermediate layer is basic function layer. Include editor of geometrical modelling, feature modelling, graph to show reach processing of dimension public errand. Normally CAD/CAM compositive software has model of product of Russia of complete functional interface, unified party and data table to turn. Stratosphere is systematic layer, include design of design, analysis, procedure and numerical control process designing to wait. Can be finished through user interface from the design, task that analyses treatment. Because ground floor used same data management method, when product model is changed, the administrative pattern of data is changeless, affect to systematic program so not quite. Because the system is used statified structure, and each have interface of a standard again, such when each have functional expansion, very small to the influence of other layer. Additionally the system of some layer develops personnel to need not understand the function that interface of other arrangement of ideas provides. 5, the crucial technology with at present compositive CAD/CAM has gotten the development trend with compositive CAD/CAM solve, the characteristic of CAD/CAM compositive development henceforth and trend reflect in the following: 1, face collateral project: The angle that CAD/CAMjicheng system should optimize from overall situation sets out, can undertake manage and be controllinged to the product, undertake improve and rising to the products plan that has existed. 2, the height of a variety of functions that face manufacturing process is compositive; 3, the project database with object-oriented support; 4, parameter changes a design; 5, interface of a variety of industrial standard data and the capacity that have development 2 times; 6, intelligence changes a technology; 7, contemporary CAD technology. 6, last word: CAD/CAM is compositive it is modern industry improve product quality, shorten design cycle, raise competition ability place must design and create pattern, the crucial technology with compositive CAD/CAM also becomes an enterprise to realize modernization to produce the problem that place must solve. All sorts of theory of international and home and practice offerred very good method and concept to us, and be perfected ceaselessly, extended us more development spaces. CNC MillingCNC Machining