昆工学术英语第10单元译文加课后答案.docx

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1、Unit10MechanicalEngineeringSectionAPre-readingactivitiesI.SkimmingandScanning.Beforeclass,readTextAquicklyandfindanswerstothefollowingquestions.1.WhatdoesCNCstandfor?Andwhatisit?CNCistheacronymforComputerNumericalControl.Itreferstotheideaofcontrollingmachinetoolsprogrammaticallyviacomputer.2.Whatis

2、thedifferencebetweenCNCandNC?ThereisnocomputerinvolvedinNC.3.WhatarethekeyingredientsforthegrowthofCNC?StandardG-Codelanguageforpartsprogram,CADandminicomputers.4.WhichcountriesarementionedinthetexttoshowthedevelopmentofCNC?US,GermanyandJapanese.5.WhatmakesCNCcontrolscheaper?Microprocessorshavemade

3、CNCcontrolscheaper,culminatingwiththeavailabilityofCNCforthehobbyandpersonalCNCmarket.6.HowmanykindsofCNCarelistedinthetext?ThreekindsofCNCarelistedincludingCNCmachinelathes,CNCmillingmachinesandCNCrouters.TextA参考译文计算机数控机床概述及计算机数控史Unit10MechanicalEngineeringSectionAPre-readingactivitiesI.Skimmingan

4、dScanning.Beforeclass,readTextAquicklyandfindanswerstothefollowingquestions.1.WhatdoesCNCstandfor?Andwhatisit?CNCistheacronymforComputerNumericalControl.Itreferstotheideaofcontrollingmachinetoolsprogrammaticallyviacomputer.2.WhatisthedifferencebetweenCNCandNC?ThereisnocomputerinvolvedinNC.3.Whatare

5、thekeyingredientsforthegrowthofCNC?StandardG-Codelanguageforpartsprogram,CADandminicomputers.4.WhichcountriesarementionedinthetexttoshowthedevelopmentofCNC?US,GermanyandJapanese.5.WhatmakesCNCcontrolscheaper?MicroprocessorshavemadeCNCcontrolscheaper,culminatingwiththeavailabilityofCNCforthehobbyand

6、personalCNCmarket.6.HowmanykindsofCNCarelistedinthetext?ThreekindsofCNCarelistedincludingCNCmachinelathes,CNCmillingmachinesandCNCrouters.TextA参考译文计算机数控机床概述及计算机数控史什么叫计算机数控技术?1CNC是计算机数字控制技术的简称，由较早的“NC”发展而来，NC仅仅表示数字控制。CNC指通过计算机程序控制机床。早先的“NC”概念与计算机无关，而是通过像打孔纸带控制机器之类的东西对机床进行控制。2NC数控技术和CNC数控技术都大大地提高了机床的

7、生产效率，因为这些机床不需要加工技术人员一直关注和操作，机床也能自动运转。在这类自动化技术出现之前，主要是运用自动化程度相对较低的液压仿形装置。液压仿形装置运用液压动力，按照样板或靠模控制车刀或铣刀的运动轨迹。很多普通手动车床用到的锥度仿形部件与液压仿形装置的功能并无不同，只是液压仿形装置不仅能仿形简单的锥形形状，而且能仿形更加复杂的样板或靠模。3但是当NC数控技术以及后来的CNC数控技术首次出现，最大限度提