機(jī)電專業(yè)英語

內(nèi)容概要

本書內(nèi)容共13章，即機(jī)械基礎(chǔ)知識(shí)與部件、機(jī)械加工工具、機(jī)械加工、公差擬合與測(cè)量、鋼鐵及其制造、電的常識(shí)、電與電路、無線電通信與電器維修、電焊、能源、微機(jī)組裝與維護(hù)、自動(dòng)化與機(jī)器人、電腦制圖。為便于讀者更好地利用本書，編者在每節(jié)后面都附有詳細(xì)的課文注釋和詞匯，希望對(duì)讀者有所幫助。    《機(jī)電專業(yè)英語》內(nèi)容新穎、圖文并茂、通俗易懂、門類齊全、適應(yīng)面廣，適合中等職業(yè)學(xué)校學(xué)生的實(shí)際水平。

書籍目錄

Part One：Basic Knowledge of Machine and Mechanical Components　1.Basic Knowledge of Machine　2.Shaft　3.Shaft Accessories--Keys and Pins　4.Bearings  　5.Screws　6.Worms．Worm Gears　7.Cam　8.GearsPart Tw0：Machine Tools  　1.Fixture and Jig　2.Reamer  　3.Grinding Wheel　4.Boring Tbol　5．Turning Tool　6.Cutting Tool  Part Three：Machining　1．Turning　2.ne Lathe and Its Construction　3.Milling  　4.Milhng Machine　5.Grinding　6.  Bench Work  ……

章節(jié)摘錄

　　Most metallic materials allow phase transformation in the mud state after the shaping processwithout changing the general geometry， which makes it possible to control the structure and thus theproperties within rather wide limits， practical technical operations， which are associated with suchphase transformations， are called heat treatment. There are three main operations in the heat treat-ment of steel ： hardening， tempering， and annealing.　　The hardening operation consists of heating the steel above its critical range and then quenchingit， that is rapidly cooling in a suitable medium such as water， brine， oil， or some other liquid. Havingbeen hardened，the metal must be given a tempering treatment which consists of reheating the hard-ened steel to a temperature below the critical range， holding at this temperature for some time andthen followed by cooling in water， oil or air.　　The critical points or temperatures are the temperatures at which a certain change takes place inthe physical condition of the steel. These points are very important because in order to properlyharden a piece of steel， it must be heated to a temperature above the upper critical point. Havingknown the critical points for certain steel， we can easily control the heat in the furnace.Gas， oil，and electric furnaces are the most commonly used for heat treating metals.　　Annealing is the uniform heating of a metal above usual hardening temperatures， followed byvery slow cooling. Annealing may be carried out either to soften a piece that is too hard to machineor to remachine a piece that has already been hardened. Annealing also relieves internal stressesproduced by machining.　　Nomalizing is to heat the steel slowly to about 30℃ above its upper critical temperature， thenfollowed by cooling in still air. The process is applied to achieve the best combination of mechanicalproperties when it is undesirable for the material to be in the softest possible condition.

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