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1、钣金工程图及加工基础（Sheetmetalengineeringdrawingandprocessingbasis）ThefirstcornerviewmethodisadoptedinChina.Themethodofthefirstcorneroftheviewis:mainview,overlooking,leftview,01January20101.ViewreadingWhatarethethreeviews?Thefirstcornerview:Viewofthetrigonometrictrigonometry:Perspectiveofprojectionme
2、thod:Themethodofprojectionontoaselectedsurface,whichisprojectedontothesurfaceoftheprojectile,iscalledprojectionThethirdviewistoseetheplaneofanobjectfromthethreedirectionsofthedifference,andthenputthethreeplanesintoagraphicform,calledthreeviewsTheformationofthreeviewsThethree-projectiveplanes
3、ystemconsistsofthreeverticalprojectiveplanesthatcomprisethreeprojectiveplanes,whicharepositiveprojectiveplanes,horizontalprojectiveplanes,andsideprojectingprojectiveplanesPutobjectsinthreeplanesystem,accordingtotheorthogonalprojectionmethod(parallelraysandtheverticalplaneofprojection)separat
4、iontothreesurfaceprojection,ledbyformerbackwardontheorthographicprojectionwassufferingfromtheviewofmainview,onthecastinahorizontalplane,calledtheverticaldownwardfromlefttorightonthesideoftheverticalplaneofprojectionfordevelopingviewiscalledtheleftviewThetrigonometricviewmethodis:mainvision,f
5、rontview,rightvisionNomatterwhichkindofwaytoaccept,argumentsarethesame,torecognizethreeviewdrawingfromthreeAngletoseea3dgraphics,andistherequirementofknowledgemapinmindshouldhaveastereoviewthinking2.WhatisthedifferencebetweendomesticandforeigndrawingsA.theorientationofviewisnotthesame.(thefi
6、rstcornerviewisacceptedinChina.B.Thepositiononaplaneisnotthesameasshowninfigure1:ThemainbeforeThemainproneOntheleftrightA,bAdomesticthreeviewbforeignthreeviewsC.Thesizeofthelabelisnotthesame.Theforeignoceanisusuallymarkedincoordinates,withametricsystemoraBritishsystemoftwosizes.Thedomesticac
7、ceptanceofthedirectstandardsystem(theoneinch=25.4mm)1.Knowledgemap:(importantpoint:longpairofpositive,highlevel,andwide)Example1:brickstereogramandthreeviewsathomeandabroad2.CommonEnglishannotationsonthedrawingsThreadribCode/versionItem/revCopperpl
