The CAD/CAM information that is based on Internet is compositive environmental research

Summary: Network is the development trend of production technology, the CAD/CAM system with compositive existing enterprise needs to have different compose data between share with exchange. Analysed the design requirement of network CAD/CAM construction of system, offerred its frame model, described product data in detail analytic the function with changeover module, gave out geometrical information and the extraction method that are not geometrical information, defined unified product part information to describe way with the model of object-oriented spare parts information of backbone feature, for different CAD/CAM each other exchanged product data to provide a basis between the system. Compete to answer increasingly intense market, urgent need realizes production enterprise products plan information and between production information compositive, the exchange that and be conveniently between the partner realizes product information and share correspondence at diverse user demand, the CAD/CAM system of current and different price had gotten relatively general use was experienced for the most part among them develop and improve for years. Had applied in practice in the outstanding tool in be being mixed to make engineer hand for products plan division by the proof but these systems often move in different soft hardware environment, need the support of different level. As the ceaseless development of Internet technology, the development trend that the CAD/CAM technology of network is sure to become future to make industry falls in this kind of circumstance. News has inevitably between CAD/CAM system share with exchange. This raised new requirement with respect to the expression that is product information, build good construction of system, offer the applicable commutative tool, product letter that establishs a standard to open, the main goal that expresses means to become implementation network CAD/CAM. Be based on afore-mentioned understanding, offerred the systematic frame model of network CAD/CAM compositive environment. The key described graphical data to collect the function of module and means, gave out finally the frame structure that compositive environment of the CAD/CAM below network environment introduces below object-oriented product information model. Reach the method that makes diagnostic news from spare parts of the extraction in CADD data file. The CAD/CAM compositive environment of network of 1 system frame involves the mass data information that passes between different system necessarily, this this information not only the pattern is different, and the commutative problem that may come from different supportive platform to want to solve different compose data, construction of system must satisfy following requirements: Cross platform ability system to should be had can join the job is in the workstation over different system, provide the unified tool that crosses trade of platform data information. Data is browsed retrieve with what retrieve ability system to should provide different ground data with the tool that browse, the data that makes different dirty stands can come true conveniently exchange and share. Data format changes ability system to should provide the identifying of different compose data and changeover mechanism, the format amount to that synthesizes earnings news the standard further is occupied compositive lay a foundation. The safety of information of significant data of attributive government ability hands the active management that relies on user attributive, because of this system must can assure " proper person gets appropriate information below appropriate time and circumstance " . Graph the overall frame of compositive environment of 1 network CAD/CAM uses such system, the user on different CAD/CAM workstation (engineer) will OK share design fruit in network environment conveniently, implementation crosses platform collaboration. The graph shows the overall frame that is a system 1 times. This system divides a structure, the most rock-bottom amount to occupies a layer, basically use at recording systematic user information (if the user compiles this information, attributive information,wait) , the client carries message (message of all sorts of soft, hardware that carry like the client) with product information (the) of product data information that model of information of contented standard product defines. Intermediate layer is logistic layer, basically carry implementation in the server. The client that finish carries the information management that reachs an user, answer a client to carry pair of product data that offer to undertake retrieval a request, according to the client upright information record is given out retrieve an instruction, will retrieve a result " the interpreter is become " the data file of standard format records product data according to object-oriented product information model. It manages the link of systematic implementation and data layer through the database; Use information to control administrative system (ICMS) passes Internet and each client end to be linked together. The processing of all sorts of data, the operation such as the identifying that includes different compose data and format changeover will be carried in the server entirely finish, can assure product consistency of data. User layer by what distributing to carry workstation to go up in each client " this locality system " composition. The client carries a system to include this locality file to manage system and this locality file to retrieve a tool, transmit the communication that manages module implementation and server through network data, the data that answers a server to give out retrieves an instruction and pass the retrieval that accords with a condition the server as a result. It is OK still that network data transmits administrative module to eye Wu implement put forward data retrieval apply for and describe tie condition, the data file of the standard format that outputs the server downloads this locality. Data is analytic module is OK the data file standard format " interpreter " the format that can unscramble for this locality system, by data the tool that browse is undertaken indication. This kind of structure can satisfy the structural requirement of network CAD/CAM system already. Can satisfy pair of consistency of data to ask again, develop and can maintain cost what utmost ground reduces server end and client to carry software at the same time. Data is analytic with one of core function module that changing module is systematic logic layer, feature of spare parts geometry and information of blame geometry feature are collected in basically completing the CADD document from the input, detailed introduction will have to this module below the function of the format data file that makes a standard then. 2 products data is analytic module of as analytic as the data that changeover runs at the server to carry changeover is in charge of receiving the CARD data document from client Duan Chuanlai, the geometrical information that collects a part from which and blame He Xin ceases, generate those who be based on a feature to have the record of product component information of standard format. Data of graph 2 CADD is analytic the functional frame that the functional frame graph with the functional frame module that changes module shows this module 2 times, among them the function of departmental cent describes as follows in detail: Files of all sorts of data of 2 dimension CADD all can regard input part as module input information, the extraction of data format and feature has nothing to do any graphical files that make by CADD system can be identified automatically by the system, but complete spare parts must be included to sending shadow view message in the graph, structure of view organization, graph and character are tagged etc must accord with concerned national level and the regulation of all sorts of descriptive geometry principles, otherwise the system will sign up for a fault. The organization of graphical data and analytic the data of spare parts information in the legal CADD document that can be identified by the system will be numerated by the system and have memory according to particular structure, cent is geometrical information (all sorts of graph elements or substance, wait like linear, arc, circle) and blame He Xin ceases (all sorts of character elements and substance. If the character is tagged, dimension is tagged and tolerancepublic errand is tagged etc) two kinds, so that the processing of follow-up segment among them, concern according to the coordinate position of element of each schism substance in geometrical information and mutual join, them combination becomes all sorts of " line draw a frame round " these " line draw a frame round " cent is two kinds: Close line draw a frame round and open line draw a frame round, be like a graph respectively 2 in be shown. Pursue the algorithmic circuit that 3 geometry information draws expresses the semantics in diagnostic string V of classification of element of elemental character semantics is fore-and-aft and linear level of hypostatic name H is linear hypostatic name I is inclined front view of hypostatic name F inspects rectangle of R of hypostatic name of circle of C of name of entity of arc of A of linear and hypostatic name, } substance breaks up number number [, ] does data break up number number: ? Urgent covered with clouds of  of  Qia surname goes feature of geometry of number of additional number of? of covered with clouds identifies all geometry substance that attributes same view to be able to be closed in complete necessarily in line draw a frame round. Because this is OK basis He Xin breath will differentiate view, the view relation that is not geometrical information also can get clear label. According to descriptive geometry principle, the geometry of line draw a frame round that cent attributes different view can constitute a complete geometrical feature information, graph 2 in gave out the geometrical feature combination of an aperture. All sorts of tags information semantics in be not geometrical feature to discern pair of plans identify, include a character to tag, dimension is tagged and tolerancepublic errand is tagged etc. The pattern that geometrical information extraction creates by CADD system of the standard is constituted by all sorts of substance, identify a system to numerate orderly according to the record in data file each substance information, generate corresponding digraph. Through simplifying digraph, can get the join relation between each substance and join order, in order to generate all sorts of (close / open) line draw a frame round. Concern according to the correlation of digraph node, of certain route draw a frame round close quality. These line draw a frame round conveyed the positional relation of of all kinds substance in the design and geometrical attribute explicitly, the place in the design is implicit " view " information also should be identified and extraction comes out. Any designs that accord with CADD standard, the line draw a frame round that close will be had to be able to include in every view the other in view basises of all line draw a frame round this one premise, can undertake to the line draw a frame round in the design " view " differentiate. Make the geometry that collects the spare parts feature that will identify gain especially and blame geometry information match, all data of production feature of some of attainable spare parts, construct then the information model of the spare parts. These data can satisfy the requirement of CAD(CAM compositive environment to product data information. Data is analytic as main as what change module function is information identifying and extraction, the extraction method that geometry and blame geometry information will introduce below according to include relation, line draw a frame round data logging assembles at what differ, the gather amount that forms finally is the amount of view namely, and in gather most the coordinate limits that the coordinate limits of spread cables casing is view namely. The coordinate that nods according to all sorts of definitions that tag information defines the view that its belong to. The view structure that sets according to the standard undertakes marking to view, the coordinate in every view becomes a system oneself, convenient and umbriferous relation is decided really. Now, each other have nothing to do close and opened line draw a frame round to had undertaken recombining according to view relation, it is the string that can have translate into of these data of line draw a frame round simply discriminating for the system next, call geometrical feature string, this string is comprised by semantic element and data. The partial semantics element that right watch listed the system supports. Whole diagnostic character explain comprise according to the structure that be as follows: < view name > < fact rests initiative mark > < entity name > < data initiative mark > < data name > < data is worth > < data ends sign > < substance ends a sign > graph 4 in recorded scale to be 1:1in the design, a diameter is 12mm, deeply the geometrical feature string of the blind aperture of 24mm. Graph system of string of 4 geometry feature first draw a frame round of a line in view of some of make choice of, the geometrical feature that makes this line draw a frame round child character explain. The coordinate in each view fastens recycle and the correspondence of graphical substance concerns, decide this line draw a frame round to join hatching draw a frame round mediumly in other view, make corresponding feature child string. The diagnostic string in will all finally view is amalgamative get complete diagnostic string. In the process that the extraction of letter idle is in blame geometry to concern to undertake recombining to the substance in the design according to view, all sorts of tagging information also by the view with corresponding classify, the correspondence that can judge its and geometrical feature according to tagging literal definition to choose the place concerns. Be not geometrical information to recover the main function of module is to identify all sorts of tagging in the design information, analyse its semantics, wait for among them dimension, public errand data and geometrical feature relevant couplet, get the production feature of the spare parts. All sorts of tagging in CADD design can differentiate from hypostatic composition angle it is two kinds: All component in tagging (tag VHIACRFTLlrda to be with dimension exemple.

Include line of dimension borderline, arrowhead, dimension and size number to wait) be regarded as a whole, each component all is given consider by an attribute as entity. The independence in tagging all medium component to all be regarded as a design is hypostatic, and there is explicit connection between each other. The processing that tags information to the first kind is relatively simple, the 2nd kind of tagging identifying needs to use " heuristic search " method, use the concealed sexual relationship between entity and possibility combination finds out composition stage by stage complete all compositive substance. Graph 5 in tag with dimension for exemple, say palpability tags the heuristic algorithm of information. The tagging of earning information and geometrical information are compositive the production feature information that gets CAM system is handled can be mixinged by CAPP. The expression of diagnostic information describes considering information but expansibility, use object-oriented method to describe production feature information, regard spare parts information as the one part of the object, make the model of spare parts information that is based on a feature together with the information such as spare parts lot number, material. Diagnostic information is concerned to have a class by abstraction kind. Kind in all sorts of property that include a feature not only, still provided the means that undertakes handling to relevant attribute. Graph the 6 information models that depicted a part. The spare parts information that defines according to model of this one information serves as data analytic the output with changeover module, have a description with unified format. Graph the demand that 5 conclusion are based on the types of 6 spare parts news that are based on a feature to make the product below the condition data is shared and be exchanged to the network analyses the algorithmic flow chart that 5 dimension tag information identifying, offerred the frame model of network CAD/CAM compositive system, undertake crossing the environment of development of platform collaboration product to used the enterprise user of different CAD/CAM software to offer. Among them data is analytic the geometrical information that identify in the data file that can output from standard CADD system with changeover module and collects a part and blame geometry information, make the production feature news of the product, build unified product information to describe a form according to the definition of model of object-oriented spare parts information. What the system can promote network environment to leave collateral project is effective carry out reach between all sorts of CAD/CAM systems without seam compositive, convenient enterprise uses a network to undertake the product develops collaboration, reduce an enterprise to be thrown to the capital of CAD/CAM system greatly thereby, shorten product development cycle, improve products plan quality. CNC Milling