計(jì)算機(jī)輔助設(shè)計(jì)外文翻譯---cadcam的應(yīng)用范圍-文庫吧
2025-04-16 17:01 本頁面
【正文】 f the major objectives of CAM is the integration of the various activities in the product cycle into one unified system, in which data is transfened from one function to another automatically. This leads to the concept of puterintegrated manufacture ( CIM), with the final objective being the paperless factory. Several developments have taken place, but no totally integrated CIM systems have yet been achieved. Since the design and processplanning functions are carned out once in the product cycle, these are the most suitable functions for integration. This integration is particularly desirable because the geometric data generated during the design process is one of the basic inputs used by process plannipg when determining appropriate manufacturing sequences and work plans174。. Consequently, various activities in desilSll and process planning can share a mon design and manufacturing data base, as illustrated in .9. With such a system, geometric models of the products and ponents are created during the design process. This data is then accessed by various downstream activities, including N C programming, process planning, and robot programming. The programs and work plans generated by these activities are also added to the data base. Production control and inventory control programs can then access the work plans, time estimates, and parts lists (bill of materials file), in preparing the manufacturing schedules, for example. 1 ComputerAided Design Computeraided design, or CAD as it is more monly known, has grown from a narrow activity and conceI。t to a methodology of design activities that include a puter or group of puters used to assist in the analysis, development, and drawing of product ponents. The original CAD systems developed and used in industry could more realistically be classified as puteraided drafting systems. However, the benefits, of using basic geometric information for structural analysis and planning for manufacturing were quickly recognized and included in many CAD systems. Today, as in the past, the basis for CAD is still the drafting features or interactive puter graphics (ICG) that these systems were originally designed to perform. However, the scope of these systems has taken on a new meaning. In general, there are four basic reasons for implementing CAD systems. 1 . A reduction in design time. The total time required from inception of an idea to its plete specification can be reduced by an order of magnitude by using easily alterable geometric models. Design perturbations/ changes can be pleted in minimal time. Whole scenarios of design possibilities can be constructed quickly. 2. Improved product design. Because CAD systems allow the designer to alter the product without major redravring with considerable time mitment, many final designs can be constructed in a reasonable period of time. Similarly, these designs can be automatically analyzed for stlUCtural characteristics by using puteraided engineering (CAE) software such as finiteelement modeling (FEM) . 3 . Improved information access. Because CAD drawings are stored in a large puter database, they can be accessed quickly and easily. Parts can be coded on the basis of geometric shape, and similar parts can be called up to assist in the design and specification of new parts. Standard parts can be employed whenever possible, rather than having to reinvent the wheel over and again. 4. Manufacturing, data creation. With the advent of numerical control (NC) carne the need to automatically generate the tool path required for machining. Sinc
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