《机械制造专业英语》教案

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1、Unit1EngineeringDrawing一、NewWords:Coordinatesystem:ThebasicofallinputAutoCADistheCartesiancoordinatesystem,andthevariousmethodofinput(absoluteorrelative)relyonthissystem.Coordinatevalue:坐标值Cartesiancoordinateaxes:笛卡尔坐标轴Perpendicularly:垂直地Projection:投影Orthographicprojection:正投影1

2、.1coordinatesystemCAD=computer-aideddesignFixed:firmlyinposition;stationaryLocate:vt.TodeterminethepositionofPositiveandnegative:Illustrate:toexplainDrafting:n.制图1.2TypesofViewsAuxiliary:辅助视图Detail:n.详图；局部Derived:取得；由来Scaling:enlargescaleClarification:tomakeclearPlanar:tow-Ddra

3、wingCross-section:横截面Datumplane:基准面Fig.1-3:Brushwithspring:F带弹簧的电刷Handie:手柄Needlebearing：滚针轴承Retainingring:挡圈Chuckspacer:夹头木寸片Key:销Symmetrical：对称的Configuration::结构1.1Multiviewdrawingengineeringdrawingisanabstractuniversallanguageusedtorepresentadesigner'sideatootherHomework:Pag

4、e9:Exercise:1.filltheblankswithaproperwordaccordingtothetext.二、TechnicalReadingThefollowingdiagramshowswhathappensinadisplacertypeStirlingengineduringoneworkingcycle・A.Thepowerpistonisinitslowestandthedisplacerinitshighestposition.Alltheworkinggasisinthecoldspace.B.Thedisplacer

5、isstillinitshighestposition.Butthepowerpistonhasgoneupandcompressedthegasinthecoldspace・C.Thepowerpistonisnowinitsupperpositionandthedisplacerhaspushedthegasthroughthecooler,theregenerator,andtheheatingpipesintothehotspace.D.Thehotgasisbeingexpanded,andhestenergyisbeingtransfor

6、medintomechanicalenergyasthedisplacerandthepowerpistonarepusheddownintotheirlowestpositions.Thepistonwillstaytherewhilethedisplacerrisesandpushesthegasthroughtheheatingpipes,regeneratorandcoolerintothecoldspace—andwearebackwherewestarted・Words:Diagram：图表Position：位置Stirling:斯特林（

7、音译）Displacer:置换器Piston:活塞Regenerator蓄热器Cooler：冷却器Expand：膨胀As：随之hestenergy：热能mechanicalenergy：机械能译文：置换器型斯特林发动机工作循环如下所示：A.置换器在最高位，动力活塞在最低位。所有的工作气体在冷空间；B.置换器不动，动力活塞上升并挤压冷空间的气体；C.动力活塞到达最高位，置换器下移，推动气体经过冷却器、蓄热器、和加热管进入热空间；D.热气膨胀，热能转变成机械能，随之动力活塞和置换器到达最低位。动力活塞不动，置换器上升推动气体经过加热管、蓄热器和冷却器进入

8、冷空间回到起点。(2)Tolerancescoverdimensionalvariationandsunfa