《專業(yè)英語（機械類用）（第2版）》是根據高等職業(yè)技術教育教學的要求編寫的。全書共分4大部分，內容包括：機械工程材料、機械零件、機械加工和各類機床以及現(xiàn)代加工制造技術，同時附加了產品說明書范例和參考譯文等內容，以便于教學、自學和應用。《專業(yè)英語（機械類用）（第2版）》取材力求應用面廣，并具有專業(yè)詞匯量和語言豐富、實用性強的特點，希望讀者借助《專業(yè)英語（機械類用）（第2版）》的學習，能達到提高閱讀水平和應用專業(yè)英語的目的。
《專業(yè)英語（機械類用）（第2版）》可作為高等職業(yè)技術院校、高等院校專科、成人教育學院、職工大學等大專層次的機械類專業(yè)英語課程的教材，也可作為廣大自學者和工程技術人員的參考用書。
本教材是根據高中畢業(yè)3年制、兼顧2年制的高職高專教學計劃需要編寫而成的。
在編寫本書時，我們從高職教育的實際出發(fā)，結合專業(yè)英語的教學實踐，確定編寫的指導思想和教材特色為：從機械專業(yè)出發(fā)，循著機械制造過程的自然順序，由淺入深，由簡到繁，循序漸進。
本書分為五大部分，共計45篇文章。所涉及的內容包括：工程材料、熱處理、機械零件、機械加工及各類機床、切削原理、公差與配合、計算機輔助設計與制造、數控技術、機器人技術等。本書推薦學時為36學時，帶s號內容可根據具體情況選用。
本書取材基本源于英、美、澳大利亞文獻原著。為保持原著的語言風格，編者對原文只做刪節(jié)，不做改寫。在每篇短文后，給出了文中生詞、詞組以及某些專業(yè)詞組，并對正文中一些疑難句子給出了注釋或參考譯文。短文后還給出部分思考題，供練習用。本書選材廣泛，語言規(guī)范，難度適中，便于自學。
全書由夏虹主編。第一部分由夏虹和孫振忠編寫，第二部分由許英姿編寫，第三部分由楊愛蘭編寫，第四部分由王延遐編寫，第五部分由夏虹編寫，最后由夏虹、許英姿、孫振忠定稿。本書在編寫過程中得到河南科技大學徐順利副教授的大力幫助和悉心審閱，并擔任了本書的主審。此外，還得到其他多方面人員的熱心支持，對此，我們表示由衷的感謝！
由于水平有限，時間倉促，不足和錯漏之處在所難免，祈望讀者不吝賜教。
第2版前言
第1版前言
Part 1 Fundamentals of Manufacturing
Unit 1 Definition of Manufacturing
Unit 2 Design Materials and Production
Unit 3 Engineering Materials
Unit 4 Classification of Materials
Unit 5 Properties of Materials
Unit 6 Heat Treatment and Hot Working of Metals
Unit 7 Mechanics
Unit 8 Measurement
Unit 9 Inspection and Quality Control
Part 2 Mechanical Parts
Unit 10 Link and Joint
Unit 11 Power Screws
Unit 12 Clutches
Unit 13 Engine Parts
Unit 14 Gears
Unit 15 Gear Manufacture
Unit 16 Shafts
Unit 17 Springs
Unit 18 Bett Drives
Unit 19 Bearings
Unit 20 Cams
Unit 21 Turbine Engine Bearings for Ultra-High Temperatures
Unit 22 Couplings
Part 3 Manufacturing
Unit 23 Shaping and Planning Operations
Unit 24 Grinding Machines
Unit 25 Casting
Unit 26 Die Casting and Investment (or Lost Wax) Casting
Unit 27 Metal Cutting
Unit 28 Fundamentals of Manufacturing Accuracy
Unit 29 Surface Roughness
Part 4 New Technologies in Manufacturing
Unit 30 Numerical Control (NC)
Unit 31 CAD / CAM
Unit 32 Scope of CAD/CAM
Unit 33 Computer-Integrated Manufacturing
Unit 34 Robots
Unit 35 Machining Center
Unit 36 List of Various Mcchatronic Systems
Unit 37 Mechanical Engineering in the Information Age
產品說明書范例
參考譯文
詞匯表
參考文獻
Ductility is a property that enables a material to be bent, drawn, stretched, formed, or permanently distorted without rupture. A material that has high ductility will not be brittle or very hard. Hard materials, on the other hand, are usually brittle and lack ductility. Impact and Endurance Testing
A metal may be very hard and have a high tensile strength yet be totally unacceptable for a use that requires it to withstand impact or sudden load. There are a number of tests that can be used to determine the impact capability of a metal, but the test most generally used is the Chary test, Figure 1-3 shows a notched specimen that is struck by an anvil.
The energy in foot-pounds requited to break the specimen is an indication of the impact resistance of the metal.
The yield strength of metals can be used in designing parts that will withstand a static load, but for cyclic or repetitive loading the endurance or fatigue strength is useful. An endurance test is made by loading the part and subjecting it to repetitive stress. Figure 1-3 shows one way that the endurance or fatigue strength of a material may be found. Generally, a number of specimens of a metal are tested at various loading and the numbers of cycles to failure are noted. A curve of stress in pounds per square inch versus the number of cycles to failure is plotted, and these data can be used for designs involving repetitive loading. Hardness
Although there are several techniques for determining the hardness of a material, most industrial methods measure the resistance to penetration of a small sphere, cone, or pyramid. Figure 1-3 shows a penetration hardness tester.
The first step in obtaining a reading is to force the penetrator and material into contact with the specimen with a predetermined initial load. Then an increased load is applied to the penetrator, and the hardness reading is obtained by noting the difference in penetration caused by the final load as compared to the initial load.
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