機(jī)電工程專(zhuān)業(yè)英語(yǔ)

前言

　　本書(shū)第一版是根據(jù)全國(guó)高職高專(zhuān)專(zhuān)門(mén)課開(kāi)發(fā)指導(dǎo)委員會(huì)確定的機(jī)電工程專(zhuān)業(yè)課程體系中的“機(jī)電工程專(zhuān)業(yè)英語(yǔ)”課程基本要求編寫(xiě)的，其出版發(fā)行六年以來(lái)因其專(zhuān)業(yè)針對(duì)性強(qiáng)，覆蓋面廣受到廣大師生的好評(píng)。但是作為教材，其內(nèi)容特點(diǎn)必須與時(shí)俱進(jìn)。應(yīng)出版社要求，編者做了局部的修訂?！　”窘滩脑谛抻喚帉?xiě)時(shí)，有以下幾個(gè)方面的特點(diǎn)。　?。?）保留原教材專(zhuān)業(yè)針對(duì)性強(qiáng)的特點(diǎn)：修訂版保留了原書(shū)中機(jī)械電子技術(shù)的基本內(nèi)容：工程材料、機(jī)械零件、切削機(jī)床、液壓傳動(dòng)、電子線路、模數(shù)轉(zhuǎn)換、接口技術(shù)、可編程控制器和數(shù)控技術(shù)等。　?。?）更新近年來(lái)發(fā)展比較快的新技術(shù)內(nèi)容：如快速成型技術(shù)、互聯(lián)網(wǎng)技術(shù)、光刻復(fù)印技術(shù)、電子商務(wù)模式等，即便是相同的內(nèi)容，取材也選自更新的國(guó)外原版教材及論文?！　。?）增加現(xiàn)代管理一章：考慮到現(xiàn)代科技與管理學(xué)的密切聯(lián)系，選編了組織管理、機(jī)構(gòu)優(yōu)勢(shì)、市場(chǎng)計(jì)劃、廣告功能等，擴(kuò)大學(xué)生視野，增長(zhǎng)人文知識(shí)?！　。?）取消較為難懂的篇目，如并行設(shè)計(jì)、軟件工程等，增加了與日常生活有關(guān)的互聯(lián)網(wǎng)應(yīng)用、網(wǎng)上購(gòu)物等，降低了課程難度，增加了學(xué)習(xí)的趣味性?！　。?）排版風(fēng)格獨(dú)特：本書(shū)采用外國(guó)教材常用的旁注方式，理解難點(diǎn)隨課文旁注，增加了閱讀的方便性。

內(nèi)容概要

本書(shū)共分為8章，內(nèi)容包括制造導(dǎo)論、機(jī)械工程基礎(chǔ)、機(jī)械制造技術(shù)、電子及控制技術(shù)、數(shù)控技術(shù)、數(shù)控操作、現(xiàn)代制造技術(shù)、現(xiàn)代管理和互聯(lián)網(wǎng)及應(yīng)用等，每章含有課文正文、生詞詞組、難點(diǎn)注釋、理解練習(xí)、閱讀材料等部分，各章節(jié)內(nèi)容上彼此獨(dú)立，難度上循序漸進(jìn)。     本書(shū)內(nèi)容新穎，覆蓋面廣，且有一定的專(zhuān)業(yè)針對(duì)性和實(shí)用性。     本書(shū)的教學(xué)資料：包括PPT教學(xué)課件，詞匯測(cè)試系統(tǒng)等，是教師教學(xué)和學(xué)生學(xué)習(xí)的好幫手，并將免費(fèi)提供給采用本書(shū)作為教材的院校使用。如有需要，請(qǐng)發(fā)電子郵件至cipedu@163.com 獲取，或登錄www.cipedu.com.cn免費(fèi)下載。     本書(shū)可作為高職高專(zhuān)機(jī)械、機(jī)電、數(shù)控、工業(yè)工程及相關(guān)專(zhuān)業(yè)的教材，也可供工程技術(shù)人員參考。

書(shū)籍目錄

Chapter One　Fundamentals of Mechanical Engineering   Lesson 1　Properties of Materials     Reading　Metals and Alloys   Lesson 2　Classification of Steels     Reading　Machinability of Metals   Lesson 3　Heat Treatment     Reading　Materials Used for Shafting   Lesson 4　Types of Gear     Reading　Cams   Lesson 5　Rolling-Type (Antifriction) Bearings     Reading　Clutch, Rack and Worm Chapter Two　Technique of Manufacturing Engineering   Lesson 1　Mechanism of Chip Formation     Reading　Cutting Fluids and Their Importance   Lesson 2　Engine Lathe     Reading　Lathe Work   Lesson 3　The Hydraulic System     Reading　Hydraulic Pumps   Lesson 4　Electric Discharge Machining     Reading　Laser Beam Machining   Lesson 5　Benefits of A Quality System     Reading　Introduction to ISO 9000 Basics Chapter Three Electronics Technology And Automation   Lesson 1　Types of Integrated Circuits     Reading　Optoelectronics   Lesson 2　Printed Circuit     Reading　Repair of Printed Circuit   Lesson 3　Alternating-Current Motors     Reading　Motor& Motor Care and Maintenance   Lesson 4　Interfacing     Reading　A/D&D/A Converter   Lesson 5　Controllers     Reading　Guidelines for Designing a PLC System Chapter Four CNC Machines   Lesson 1　The Fundamentals of CNC     Reading　The Concepts of Computer Numerical Control   Lesson 2　Types of CNC Machines     Reading　Laser Cutting   Lesson 3　The CNC Control     Reading　Components of CNC Machine   Lesson 4　Methods for CNC Programming     Reading　Manual Programming   Lesson 5　CAD/CAM     Reading　CAD/ CAM Integration Chapter Five　CNC Machine Operating   Lesson 1　Explanation of the Keyboard     Reading　FANUC—BESK NC System   Lesson 2　Tilting NC-Rotary table     Reading　Employment Opportunities in NC   Lesson 3　Handling and Operation     Reading　Chart   Lesson 4　Failures and Breakdowns     Reading　Position Detectors- Opto-Electronical Rotary Encoders   Lesson 5　Service and Maintenance     Reading　Error Search and Repair Chapter Six Modern Manufacturing Technology   Lesson 1　Flexible Manufacturing Systems     Reading　Robotics   Lesson 2　Expert Systems     Reading　Decision Support Systems   Lesson 3　Computer Aided Process Planning     Reading　Artificial Intelligence & Expert System   Lesson 4　Rapid Prototyping and Freeform Fabrication     Reading　Stereolithography   Lesson 5　From the Present to the Future     Reading　Aesthetics in Design Chapter Seven Modern Management Chapter Eight　Computer and Application References

章節(jié)摘錄

　　Thus the cooling properties of cutting fluid depend to a large extent on thecooling method. The cooling efficiency increases with heat conductivity and specificheat of the cutting fluid, with its heat of fusion and of vaporization, and also with itsviscosity. Cooling effect increases, too, with the flow rate of the fluid, the area ofapplication and with decreasing temperature of the cutting fluid.　　The lubricating action of the cutting fluid reduces the external friction betweenrake face and chip and between flank and machined surface~. Effectiveness of thelubricating action depends, therefore, in the first place on the degree of penetration ofthe coolant between those surfaces. It follows from the magnitude of specific cuttingforces that very often, i.e. when machining steel, pressures between chip and toolpoint and between workpiece and tool point may reach 20000~30000 kg/cm2. Notwithstanding such high pressures, the use of suitable cutting fluids results in thereduction of friction and wear.　　The washing action of a cutting fluid consists in removing the products ofabrasion, chip fragments and tool wear particle. In practice, cutting fluids exhibitgood washing properties having high wettability and because particles immersed inthe liquid move downstream.　　This action has an advantageous influence on the smoothness of the machinedsurface and on the reduction of tool point wear.　　Surface loosening action of the cutting fluid, also called the cutting action of thisfluid, results from the so-called Rebinder effect. Adsorbed molecules of cutting fluid,particularly of liquids containing surface-active additives, disintegrate, diffuse andpenetrate into microgaps resulting from defects in the crystal lattice. Because of thewedge-like action of the adsorbed liquid, a very thin surface layer of the machinedmaterial becomes "loosened".　　According to Rebinders research, the thickness of this layer may reach 0.1 mm.Since the machined surface in the next pass becomes the work surface, plasticdeformation appearing in the chip formation area and slip of the chip elements occurmore easily and more frequently. This phenomenon is called internal lubrication.　　The efficiency of activated liquids increases with a reduction in unreformedchip thickness, since in this case the percentage share of the thickness of loosed layer is greater in relation to the total thickness.　　Increasing the cutting speed decreases the efficiency of activated liquids. This is due to a more ductile chip, having a much smaller number of larger gaps of all sorts （lack of preceding gap and of built-up edge）. Consequently, much fewer local vacuum spots are formed and the liquid does not penetrate everywhere, and dry friction may result.

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