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机械工程专业英语江苏建筑职业技术学院智能制造学院MechanicalEngineering
EngineeringDrawings
EngineeringDrawingsEngineeringDrawingsareusedtodefineanddescribeamachine.EngineeringDrawingisanuniversaltechnicallanguageofshapeandsizedescription.
ClassificationofEngineeringdrawingEngineeringDrawings
Drawingsconveythefollowingcriticalinformation:EngineeringDrawingstheshapeoftheobject;representedasviews;howtheobjectwilllookwhenitisviewedfromvariousangles,suchasfront,top,side,etc.Geometrythesizeoftheobjectiscapturedinacceptedunits.Dimensionstheallowablevariationsforeachdimension.Tolerancesrepresentswhattheitemismadeof.Materialspecifiesthesurfacequalityoftheitem,functionalorcosmetic.Finish
1.Sheetsizesandlayout1.1DraftingStandardsSheetsizes[1]Layoutofsheet[1]
Itispermissibletochoosethescalesshowninbrackets,ifnecessary.Whateverscaleisused,thedimensionsonthedrawingindicatethetruesizeoftheobject,notoftheview.1:4onefour或onetofour2.Scales1.1DraftingStandardsScales[1]
Typesoflines1.1DraftingStandards3.TypesofLinesDot-and-dashlinelightheavy
1.2Views1.Theorthographicprojection1stand3rdAngleProjections1stangleprojectionsymbol3rdangleprojectionsymbol
1.2Views2.MultipleviewsSixprincipleviews
1.2Views2.MultipleviewsAuxiliaryviewIsometricview
1.2ViewsSectionviewsareprojectedviews(eitherAuxiliaryorOrthographic)whichshowacrosssectionofthesourceobjectalongthespecifiedcutplane.
1.2Views4.SectionViewsFullSectionHalfSectionOffsetSectionBroken-outSectionRevolvedSectionRemovedSection
1.2ViewsInassemblydrawings,solidpartsaretypicallynotsectionedwhenacuttingplanepassesthroughtheirlongitudinalaxis.
1.3WorkingDrawings1.DetailworkingdrawingsGeometrictoleranceTechnicalrequirementsinnotesToleranceSurfaceroughnessDimensionsViewsTitleblockTableofparametersThedetailworkingdrawingofaspurge
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