Unit-9-Machining-Center-機(jī)電專業(yè)英語-圖文課件

1、Unit 9 Machining CenterContentsNew Words & Expressions Text & TranslationComplex Sentence AnalysisKey to ExercisesNew Words & Expressions programmable prugrmbl adj. 可編程序的, 程序可控的preset pri:set n. 預(yù)設(shè), 預(yù)置transfer trnsf: v. & n.轉(zhuǎn)換, 傳送 gantry gntri n. 門架，吊架changer teind n.變換器, 轉(zhuǎn)換器magazinemgzi:n n. 庫New W

2、ords & Expressions rotaryrutri adj. 旋轉(zhuǎn)的, 轉(zhuǎn)動(dòng)的interchange intteind v. 交換, 互換eliminate ilimineit v. 排除, 消除minimize minmaiz v. 最小化, 將減小到最少gauge geid v. 測量Text & Translation1Machining has evolved from individual machining machines which，with the aid of man，performed individual processes to machines capab

3、le of performing many processes.In 1968，an NC machine was introduced which could automatically change tools，making it a possibility to perform different processes on one machine. This kind of machine is defined as a “machining center”a machine that can perform a variety of processes and change tools

4、 automatically while under programmable control.Text & TranslationThe study of machining center begins with the history of numerical control (NC). Numerical control is applied on a great number of machines. 2These range from single spindle drilling machines，which often have only two axis control，to

5、machining centers，which can do drilling，boring，milling，tapping and so forth with four axis control. A machining center can automatically select and change as many as 32 preset tools. The table can move left/right or in/out and the spindle can move up/down or in/out，with positioning accuracy in the r

6、ange of 0.000 3 inch in 40 inch of travel. The machine has automatic tool change and automatic work transfer so that workpiece can be loaded/unloaded while the machining is in process.Text & TranslationCNC lathes make use of the concept of automatic tool change. The tools are held on a rotating tool

7、 magazine and a gantry type tool changer is used to change the tools. Each magazine holds one type of cutting tool. The versatility of the machine is increased by combining rotary work and rotary tool operationsturning and millingin a single machine. Tools can be changed within six seconds or even l

8、ess. 3It is also common to provide two or more worktables，permitting work to be set up while machining is done on the workpiece in the machine，with tables being interchanged automatically. As a result，the productivity of these machines can be quite high and the chip producing time comes close to 50%

9、 of the total time.Text & TranslationTwo new trends are observed in the development of machining centers. One is the growing interest in smaller，more compact machining centers and the other is the emphasis on extended shift or even unmanned operations. Modern machining centers have contributed signi

10、ficantly to improved productivity in many companies. They have eliminated the time lost in moving workpieces from machine to machine and the time needed for workpiece loading and unloading for separate operations. In addition，they have minimized the time lost in changing tools，carrying out gauging o

11、perations，and aligning workpieces on the machine.Text & Translation切削加工已從由人工操作完成單一工序的單臺機(jī)器發(fā)展到能完成多道工序的機(jī)器。1968年上市的一臺數(shù)控機(jī)床可以自動(dòng)地更換刀具，并在一臺機(jī)床上能完成許多工序。這種機(jī)床叫做“加工中心”，是一臺能夠完成多道工序，并能在程控下自動(dòng)更換刀具的機(jī)床。Text & Translation對加工中心的研究是隨著數(shù)控的發(fā)展而開始的。計(jì)算機(jī)和數(shù)控可用于許多種機(jī)器，從通常只有兩軸控制的單軸鉆床到四軸控制的具有鉆、鏜、銑、攻絲等功能的加工中心都能適用。一個(gè)加工中心能夠自動(dòng)選擇和更換多達(dá)32把

12、預(yù)置刀具。工作臺可左右或里外移動(dòng)，軸可上下或里外移動(dòng)。定位精度在40英寸（101.6 cm）的移動(dòng)距離中小于0.0003英寸( 0.000762 cm)。由于機(jī)床能夠自動(dòng)更換刀具和自動(dòng)加工轉(zhuǎn)換，工件可在不停機(jī)的情況下上機(jī)或下機(jī)。Text & Translation自動(dòng)更換刀具的概念已擴(kuò)展到CNC（計(jì)算機(jī)數(shù)控）車床。把刀具裝在一個(gè)旋轉(zhuǎn)的刀具庫上，用一個(gè)門形的刀具更換裝置來更換刀具，每一個(gè)刀具庫裝一種切削刀具。把旋轉(zhuǎn)加工和轉(zhuǎn)動(dòng)刀具車削與銑削在一臺機(jī)床上結(jié)合起來可使其用途更為廣泛。刀具能在6秒或更短的時(shí)間內(nèi)更換完畢。有兩個(gè)或兩個(gè)以上工作臺的也很常見。隨著工作臺的自動(dòng)交換，可以對機(jī)床上的工件進(jìn)行加工的

13、同時(shí)安裝另一工件。這樣，這類機(jī)床的生產(chǎn)率就非常之高，切削時(shí)間通常接近整個(gè)加工時(shí)間的50%。Text & Translation加工中心有兩個(gè)發(fā)展趨勢：一是更小、更緊湊的加工中心的興起；二是對擴(kuò)展軸或無人操作的重視?，F(xiàn)代的加工中心對很多公司提高生產(chǎn)率有著重要的作用，節(jié)省了把工件從一臺機(jī)床移向另一臺機(jī)床與對工件的單個(gè)加工所需的裝卸時(shí)間。此外，更換刀具、測量和工件定位的時(shí)間也縮短至最低限度。Complex Sentence Analysis1 Machining has evolved from individual machining machines which, with the aid of

14、 man, performed individual processes to machines capable of performing many processes. 切削加工已從由人工操作完成單一工序的單臺機(jī)器發(fā)展到能完成多道工序的機(jī)器。with the aid of ：在幫助下Complex Sentence Analysis2 These range from single-spindle drilling machines, which often have only two-axis control, to machining centers, which can do dri

15、lling, boring, milling, tapping and so forth with four-axis control. 計(jì)算機(jī)和數(shù)控可用于許多種機(jī)器，從通常只有兩軸控制的單軸鉆床到四軸控制的具有鉆、鏜、銑、攻螺紋等功能的加工中心都能適用。 these：指代上句的computer and numerical,“計(jì)算機(jī)和數(shù)控”。 第一個(gè)which：引導(dǎo)非限制性定語從句，修飾single-spindle drilling machines，而第二個(gè)which則修飾machining centers。Complex Sentence Analysis3 It is also comm

16、on to provide two or more worktables, permitting work to be set up while machining is done on the work piece in the machine, with tables being interchanged automatically. 有兩個(gè)或兩個(gè)以上工作臺的也很常見。隨著工作臺的自動(dòng)交換，可以對機(jī)床上的工件進(jìn)行加工的同時(shí)安裝另一工件。 permitting：現(xiàn)在分詞做狀語 while：引導(dǎo)時(shí)間狀語從句 with tables being interchanged automaticall

17、y是由with引起的獨(dú)立主格結(jié)構(gòu)Key to ExercisesI. Translation1. 加工中心 2. perform a variety of processes3. 四軸控制 4. automatic tool changing5.自動(dòng)加工轉(zhuǎn)換6. rotary work 7. 無人操作 8. gauging operationKey to ExercisesII. True or False1. F 2. T 3. F 4. F 5. TKey to ExercisesIII. Blank Filling1. in process 2.rotating tool magazine 3. cutting tool 4. versatility 5. set up 6.pr