計算機(jī)輔助設(shè)計外文翻譯---cadcam的應(yīng)用范圍-文庫吧資料
2025-05-21 17:01本頁面
【正文】 niques for highvolume items veISUS jobshop procedures for lowvolume items. The U. S. Department of Commerce has pointed out that in the United States, 95 % of all products are produced in lots of size 50 or fewer. This indicates that although highvolume techniques are desirable from a consumer standpoint (lower cost), these techniques are not appopriate from a manufacturing standpoint (lower cost)。s contributions took a different turn from Taylor39。 the increased demand far durable goods. This increased demand meant that manufacturing cauld no. longer be treated as a blacksmith trade, aIld the use af scientific study was emplayed in manufacturing analysis. Taylar pianeered studies in scientific ITlaI1agement in which methods far productian by both men and machines were studied. Taylar also condueted meatalcutting experiments at the Midvale Steel Campai1y that lasted 26 yeaIS and produced 400 tans af metal chips. The result af Taylar39。\onably sophisticated ponent) and generating manufacturing plans, preparing paIt programs and producing the pm is possible in days rather than weeks. In general, the tatal en!?ineering aI1d manufacturing time has been markedly using integrated CAD/CAM methodalogies. 2 Computer Aided lVIanufacturing The scientific study of metalcutting and autamatian techniques are pnxlucts af the twentieth century. Two. pianeers of these techniques were Frederick Taylar and Henry Ford. During tl1e early 1900s, the improving U. S. standard af living brought a new high in penlOnal wealth. 39。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. Since the part geometry dictates the
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