ug汽車造型加工-資料下載頁

　　

【正文】 工實例教程. 北京：清華大學出版社，7． 郝一舒，趙卿. 基于UG的5軸數控高速銑削中心在仿真加工中的應用. 制造業自動化,第9期,20078．席平，宋玉旺. 基于UG的制造輔助系統. 航天制造技術，第7期，20069．吳磊編著. UG NX中文版曲面設計典型范例教程. 北京：電子工業出版社，10．王志峰，高錦輝，第5期，200711. 陳曉英，徐誠. UG軟件在數控加工中的應用. 機床與液壓，第1期，200612．呂文閣，陸藝華. ，第10期，2007附錄A：英文資料The puter in Die Design (CAD)The term CAD is alternately used to mean puter aided design and puter aided drafting. Actually it can mean either one or both of these concepts, and the tool designer will have occasion to use it in both forms.CAD puter aided design means using the puter and peripheral devices to simplify and enhance the design process. CAD puter aided drafting means using the puter and peripheral devices to produce the documentation and graphics for the design process. This documentation usually includes such things as preliminary drawings, working drawings, parts lists, and design calculations.A CAD system, whether taken to mean puter aided design system or puter aided drafting system, consists of three basic ponents。 hardware, software, users. The hardware ponents of a typical CAD system include a processor, a system display, a keyboard, a digitizer, and a plotter. The software ponent of a CAD system consists of the programs which allow it to perform design and drafting functions. The user is the tool designer who uses the hardware and software to simplify and enhance the design process.Graphics displays represented the first real step toward bringing the worlds of tool design and the puter together. The plotters depicted in Figure, represented the next step. With the advent of the digitizing tablet in the early 196039。s, CAD hardware as we know it today began to take shape. The development of puter graphics software followed soon after these hardware developments.Early CAD system were large, cumbersome, and expensive. So expensive, in fact that only the largest panies could afford them. During the late 1960’s CAD was looked on as an interesting, but impractical novelty that had only limited potential in tool design applications. However, with the introduction of the silicon chip during the 197039。s, puters began to take their place in the world of tool design.Integrated circuits on silicon chips allowed full scale puters to be packaged in small consoles no larger than television sets. These miniputers had all of the characteristics of full scale puters, but they were smaller and considerably less expensive. Even smaller puters called microputers followed soon after.The 197O39。s saw continued advances in CAD hardware and software technology. So much so that by the beginning of the 198039。s, making and marketing CAD system had bee a growth industry. Also, CAD has been transformed from its status of impractical novelty to its new status as one of the most important inventions to date. By 1980, numerous CAD systems were available ranging in sizes from microputer systems to large miniputer and mainframe system.Mold Making Using CIMComputerintegrated manufacturing (CIM) represents integration of electronic data processing (EDP) into all departments associated with planning and production of an object (in this case, a mold): the linking of puteraided design (CAD), Computeraided production (CAP), puteraided manufacturing (CAM), puteraided quality assurance (CAQ) , and production planning and scheduling (PPS)(see ) in terms of information technology. This means uninterrupted exchange of all information pertinent to a product. The munications link is provided by the integrated EDP puter. Major importance within the CIM structure is assigned to CAM. Conversion of the theoretical product developed in CAD into the practical reality of mold occurs via CAM. Linking of CAD, CAP, CAM, CAQ and PPS to implement CIMA. Use of Computers for Machining of an Injection MoldThe objective of CAM is to produce, if possible, sections of a mold without intermediate steps (., elimination of copy patterns), ., by initiating machining operations from the puter workstation.Prerequisites for CAM in the sense of CIM include CAD, the munications interface, and appropriate software and hardware for converting product information in the required production operations (see sequence diagram, Fig. 2). Mold Production SequenceB. CAD for Part ConstructionCAD means puteraided design on a monitor. The designer, initially the part designer, draws a product with the aid of the puter software. The part, primarily its visible surface, is modified until both function and appearance (design) of the part satisfy the requirements.For plastic parts with characterdetermining product properties, e. g. automobile bumper fascias, product design does not occur on the screen only. Product development takes place in a kink of bidding process in which several stylists (designers) first prepare plaster patterns, which are then presented to the management of the automotive manufacture in a petition. The management makes a selection and agrees on a design model. Next, measurements are taken at various points on the plaster pattern of the select model, and these data are transferred to the CAD system. Using these data, the part designer can now start designing the part on the screen. With the aid of software programs, the designer begins to connect the individual points to form 3D surfaces. Sharp transitions are smoothed and the product design is refined until the desired result is achieved.In a subsequent step, the work on the screen is converted into a 3D master pattern through creation of a machining program from the surface data of the part. The master pattern thus produced can now be attached to a cubing model that represents the entire automobile. At this phase in the development of the product the stylist, who was originally responsible for the plaster pattern, will generally allow minor changes to be made. After these final modifications are made, the design is approved. The approved master pattern is now plet