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can be retrieved at any time. Unit Five CAD/CAM/CAE ① CAD puter aided drafting means using the puter and peripheral devices to produce the documentation and graphics for the design process. CAD計算機輔助繪圖是指用計算機和外部設備來產生設計過程的文件和圖樣。 本句為簡單句,主語是 “ CAD puter aided drafting”, 謂語“ means”的賓語是 “ using the puter and peripheral devices to produce the documentation and graphics for the design process”。 ② Integrated circuits on silicon chips allowed full scale puters to be packaged in small consoles no larger than television sets. 硅片上的集成電路使得在控制臺上被組裝起來的大規(guī)模集成計算機不比電視機大。 allowed ... to do ...譯為“允許 …… 做 ……” 。 no larger than ...譯為“不比 …… 大,與 …… 大小一樣”。 ③ CAD has been transformed from its status of impractical novelty to its new status as one of the most important inventions to date. CAD已經從過去的華而不實變成如今最重要的發(fā)明之一。 be transformed from ... to ...譯為“由 …… 轉變成 ……” 。 Notes: New Words and Expressions : Unit Five CAD/CAM/CAE puter aided drafting計算機輔助繪圖 peripheral[ p rif r l] ,周邊的 documentation[ d kjumen tei n] graphics[ r fiks] ,圖形 preliminary drawing預制圖 working drawing工作圖 parts list零件目錄表 design calculation設計計算 processor[ pr uses] ,處理機 system display系統(tǒng)顯示 keyboard[ ki b d] digitizer[ did itaiz] plotter[ pl t] Unit Five CAD/CAM/CAE broad based industry wide工業(yè)領域 materialize[ m ti ri laiz] graphics display圖形顯示 depict[ di pikt] ,描繪 advent[ dv nt] ,到來 digitizing tablet數(shù)字化板 take shape成形 impractical[ im pr ktik l] novelty[ n v lti] ,新奇 tool design工具設計 integrated circuit集成電路 Unit Five CAD/CAM/CAE silicon chip硅片 console[ k n s ul] ,控制臺 television set電視機 miniputer[ minik m pju t( r)] 機 microputer[ m ikr uk m pju t( r)] 型(電子)計算機 status[ steit s] ,情形 mainframe system主機系統(tǒng),大型機 retrieve[ ri tri v] ,恢復 Exercises: Answer the following questions according to the text above. 1. What are the two different interpretations of the term CAD?What is the difference between these two concepts? 2. What are the three basic ponents included in a typical CAD system? 3. What is the hardware ponents included in a typical CAD system? 4. What function does CAD has when moldmaker designs the mold? Unit Five CAD/CAM/CAE Unit Five CAD/CAM/CAE Put the following words into English. 計算機輔助設計 外設 硬件 軟件 用戶 工具設計領域 集成電路 微機 小型機 巨型機 工業(yè)領域 CAD系統(tǒng) 預制圖 系統(tǒng)顯示 參考譯文: 計算機在模具設計中的應用 CAD既可以指計算機輔助設計,又可以指計算機輔助繪圖。事實上,它可指其中任何 一個也可以是兩個概念都包含。工具設計者時常在兩個方面都有使用。 CAD計算機輔助設計是指用計算機和外設使設計過程簡化和強化。 CAD計算機輔助 繪圖是指用計算機和外部設備來產生設計過程的文件和圖樣。文件通常包括預制圖、工作 圖、零件目錄表和設計計算。 無論是計算機輔助設計系統(tǒng)還是計算機輔助繪圖系統(tǒng), CAD系 都是由三個基本部 分組成 :硬件、軟件、用戶。典型 CAD系統(tǒng)的硬件組成包括處理器、系統(tǒng)顯示、鍵盤、 譯 Unit Five CAD/CAM/CAE Unit Five CAD/CAM/CAE 數(shù)字轉換器和繪圖機。 CAD系統(tǒng)的軟件由具有設計和繪圖功能的程序組成。用戶就是使用硬件 和軟件使設計過程簡化和強化的工具設計者。 直到 20世紀 80年代,在工業(yè)基礎領域大量涌現(xiàn)的 CAD才開始實用化。然而, CAD并 不是一個新的概念。雖然已經過多年改變,約 30年前在 20世紀 50年代中期 CAD已有雛 形。最早的一些計算機包括圖形顯示?,F(xiàn)在圖形顯示只是每個CAD系統(tǒng)的一部分。 圖形顯示代表了邁向工具設計與計算機真正相結合的第一步。數(shù)字化繪圖儀代表了相結合的第二步。在 20世紀 60年代早期,隨著數(shù)字化板的出現(xiàn),正如今天我們所知的CAD硬件開始成形。計算機繪圖軟件緊跟硬件的發(fā)展而發(fā)展。 Unit Five CAD/CAM/CAE 早期的 CAD系統(tǒng)巨大、笨重且價格昂貴,以致只有大公司才買得起。 20世紀 60年代后期, CAD被看成是能引起人的好奇心但華而不實,在工具設計應用中僅有有限的一點作用。然而,到了 20世紀 70年代,隨著硅片的介入,計算機開始在工具設計領域占據(jù)一席之地。 硅片上的集成電路使得在控制臺上被組裝起來的大規(guī)模集成計算機不比電視機大。這些小型機具有大型機的所有特性,但機器變小了,而且也便宜得多。一種叫做微機的更小的計算機很快隨后出現(xiàn)了。 在 20世紀 70年代, CAD硬件和軟件技術得到進一步發(fā)展。以至于到 20世紀 80年代初期, CAD系統(tǒng)的制作和銷售已成工業(yè)增長點。而且, CAD已經從 Unit Five CAD/CAM/CAE 過去的華而不實變成如 今最重要的發(fā)明之一。到1980年,大量的 CAD系統(tǒng)涌現(xiàn),從微機系統(tǒng)到小型機和大型機系統(tǒng),各種尺寸規(guī)格都有。 一旦客戶通過適當?shù)慕缑鎻牧慵O計轉到模具制造,模具設計者就可根據(jù)零件設計模具。設計者確定模具的尺寸、活動件是否必要、冷卻線路的布局和澆道口的位置等,這些都跟零件的幾何圖形有關。模具設計各方面的內容被存儲在電腦中,且隨時都可以調用。 Passage Three CAD/CAM 3 Computer aided design/ puter aided manufacturing ( CAD/CAM) refers to the integration of puter into the design and production process to improve productivity. The heart of the CAD/CAM system is the design terminal and re lated hardware, such as puter, printer, plotter, paper tape punch, tape reader, and digitizer. CAD/CAM is a unified software system, in which the CAD portion is interfaced inside the puter with the CAM system. Some of software packages are referred to as software modules and can be classified into three categories: operating systems, application programs, and user programs. . Unit Five CAD/CAM/CAE Unit Five CAD/CAM/CAE Operating systems are programs written for a specific puter or a class of puters. The operating systems especially concerned with the input/output( I/O) devices like displays, printers, and paper tape punches. In most cases the operating system is supplied with the puter. Application programs are developed for a special or specific purpose. The first language for specialized application was Automatically Programmed Tools( APT) in 1956. APT was developed to ease the job of NC programmers in developing input to NC machine tools, as illustrated in 3. Unit Five CAD/CAM/CAE User programs in CAD/CAM are highly specialized packages for creating specific outputs. For example, a user program may automatically design a gear after the user inputs certain parameters like the number of teeth, pitch diameter, and so on. Another program may 3 Example of CAD where a lathe tool is called up to show a machining sequence Unit Five CAD/CAM/CAE automatically design a gear after the user inputs certain parameters like the number of teeth, pitch diameter, and so on. Another program may calculate optim