机械英语Unit 5_59160.ppt

Unit5MechanicalDrawing EngineeringDrawing Vocabulary graphicallanguage图形语言engineeringgraphics工程图学computergraphics计算机图形学nomography图解构成术orthographicrepresentation projection 正式表示法 正投影法front top side auxiliary obliqueviews主视图 俯视图 侧视图 辅助视图 斜视图pictorialviews示图typesoflines线型 dimensions尺寸letterednotes文字标注sectionalviews剖视图symbols符号mechanicaldrawing机械制图sketch草图finaldrawing定稿图样tracingpaper描图纸 cloth布mylarfilm聚酯薄膜blueprinting晒蓝图ammonia developed diazo printing氨水显影 重氮 晒图lithography平板印刷sectiondrawing剖面图interiordetail内部细节cutting planesymbol剖面符号 section lining剖面线cross hatching断面线revolved rotated broken outsection旋转 转动 切面视图flatsurface平面knurl滚花fabricateparts零部件dimensionlines尺寸线outlinesoftheobject物体轮廓线 leaders引出线foot英尺inch英寸metricdimensioning米制尺寸workingtypesofdrawing施工型图inclinedlowercase斜体小字母verticaluppercase垂直的大写字母fraction分数 commonfraction普通分数decimalfraction小数upper lowerlimit上 下极限tolerance公差layoutdrawing布局图plantlayoutdrawing工厂布局图workarea工作区aisle过道 glasscloth玻璃纤维织物glassnegative玻璃底片phototemplates照片模板photosensitizedmetal感光金属preliminaryassembly初装图assemblydrawing装配图workingdrawing施工图detaildrawing详图 pertinentinformation相关信息partslist零件明细表schematicdrawing示意图diagrammaticdrawing草图directionofflow流向additionalinformation辅助信息electricalcomponent电气零件etched circuitdrawing印刷电路图 structuraldrawing结构图terminology术语dimensioningtechnique尺寸标注法 Howcanwecommunicatewithothers OrallanguageBodylanguageFacialexpressionWritingEtc Definition Purpose Engineeringdrawing isagraphicallanguageusedbyengineersandothertechnicalpersonnelassociatedwiththeengineeringprofession Purpose engineeringdrawingistoconveygraphicallytheideasandinformationnecessaryfortheconstructionoranalysisofmachines structures orsystems EngineeringDrawinginschoolsEngineeringGraphicssometimesincludeothertopics computergraphicsnomography Orthographicrepresentation projection Suchmethodisthebasisofengineeringdrawing frontviewtopviewObjectssideviewcomboauxiliaryviewobliqueviewattimes pictorialviews Frontview Topview Sideview Obliqueview FeaturesofEngineeringDrawing varioustypesoflinesdimensionsletterednotesplannedsectionalviewscheckedsymbolsfreehandsketchesfinaldrawingsontracingpaper cloth Mylarfilm Tracingpaper Mylarfilm Quick cheapcopymethods blueprintingammonia developed diazo printinglithography SectionDrawings Function showthecomplicatedinteriordetailcan tshowbyfront topetc viewsFeatures 1 cuttingplanesymbols showwhereimaginarycuttingplanesarepassedtoproducethesections2 section lining cross hatching appearsinthesectionviewonallportionsthathavebeenincontactwiththecuttingplane Dimensioning Functions makingsurethesizesdescribingtheshapeofobjects showingdimensionsofdrawings Purpose manufacturingsuitablepartsworkerscanbuildthestructureorfabricatepartsthatwillfittogetherMethod lines numbersplacingtherequiredvaluesalongdimensionlines usuallyoutsidetheoutlinesoftheobject andbygivingadditionalinformationintheformofnoteswhichreferencedtothepartsinquestionbyangledlinescalledleaders Sample1 Sample2 LayoutDrawings differentdrawings differentpurposesplantlayoutdrawing 1 outlineofthebuilding workareasetc 2 aredrawntoscaleaircraft masterlayout 1 isdrawnonglasscloth aluminumsheets2 theobjectisdrawntofullsizewithextremeaccuracypreliminaryassembly designlayout establishthepositionandclearanceofpartsofanassembly sample AssemblyDrawings SchematicDrawin