Chapter 5 DRAWING

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1、Chapter5DRAWINGMaincontents:Deformationfeatureofdrawing;Mechanicanalysisofdrawing;Problemsarisingindrawing;Drawingofcylindricalwork-piece;Drawingofotherrevolvingwork;Drawingofboxes;Otherdrawingmethods;Assistantproceduresofdrawing.Keypoints&DifficultpointKeypoints:Problemsarisingindrawing;Draw

2、ingofcylindricalwork-piece.Difficultparts:MechanicanalysisofdrawingNewwordsdeepdrawing/深拉深,blankholder/压边圈,cylindrical/圆柱形的，cup/杯形件，conic/锥形的,box-shaped/盒形的，rectangular/矩形的ironingdrawing/变薄拉深,flange/凸缘,wrinkle/起皱axisymmetricgeometry/轴对称几何图形,dieradius/凹模圆角半径,radial/径向的,punchcornerradius/凸模圆角半径

3、,redundant/多余的longitudinal/纵向的，relativethicknessofmaterial/相对厚度，drawingratio/拉深比，blankdiameter/毛坯直径,numberofsuccessivedraws/拉深次数，addfortrimming/修边余量Deepdrawingistheprocessbywhichapunchisusedtoforcesheetmetaltoflowbetweenthesurfacesofapunchandadie.Aflatsheetisformedintoacylindrical-,conical-,o

4、rbox-shapedpart.1.Types2.Deformationfeature3.Stressandstrainstate§5.1Deformationfeaturesofdrawing1.Typesa)Puredrawing:withoutareductioninthethicknessb)Ironingdrawing:withareductioninthethicknessGridmethod:Damagesites:bottomradiusThickness:upperbecomesthickerlowerbecomesthinnerHardening:uppers

5、eriousbottomlightChangesingrid:bottomnochangewallfromsectortorectangle2.DeformationfeatureFourparts:deformationzone(theflange)D-dtransitionzone-2dieradiusforcetransmittingzone-thewalltransitionzone-2punchcornerradiusnon-deformingzone-thebottom3.Stressandstrainstate§5.2Mechanicanalysisofdrawin

6、gStressanalysisofdeformationzoneStressdistributionindeformationzoneVaryinglawofmaximumradialstressandmaximumtangentialstressStressanalysisoftransmittingzoneofwallEquationsofequilibriumPlasticconditionBoundaryconditionwhen1.Stressanalysisofdeformationzone2.Stressdistributionindeformationzone,C

7、haracteristicpoint:3.Varyinglawofmaximumradialstressandmaximumtangentialstresssimilarwithhardeninglaw4.Stressanalysisoftransmittingzoneofwall§5.3ProblemsarisingindrawingWrinkleFractureHardening1.1Generatedeformationzone1.2AffectingfactorsRela