Chapter1Introduction1.Definitionofstamping----aplasticformingmethodRawmaterial----sheetmetalornon-metalTool----dieEquipment----pressResult----separateordeform,workpiecewithshape,dimensionandproperty.冲压是塑性成形加工方法之一。以板料（金属、非金属）为原料，利用模具在压力机上对板料施加压力使其分离或变形获得所需零件。所需零件具有一定形状、尺寸和性能。2.BasicrequirementusedinsheetformingFormability,surfacequality,toleranceinthickness,andeconomy3.Basicprocesses(1)cuttingprocesses（分离工序）:shearing,blanking,punching,parting,lancing,shaving(2)plasticdeformationprocesses（成形工序）:bending,deepdrawing,spinning,bulging,flangingChapter2Shearing,BlankingandPunching1.ShearingEquipment:straightparallelcutterst↑B↓straightinclinedcutterst↓B↑2.Blankingandpunchingmechanism(1)3deformationstages(2)Featuresofshearededgesofthesheetmetal4parts----rollover,burnishzone,fracture,burr(reason);mainaffectingfactors(3aspects)3.BlankingandpunchingclearanceTheeffectoftheamountofclearancebetweenthepunchanddieontheoperationprocess(3)featuresofshearededges(4)dimensionalprecision(5)forceandpower(6)dielife4.Thecalculatingofpunchanddiebladesize(1)Principlesofcalculation:benchmarks,limitdimension(2)Methodsofcalculation:separately,coordinately(3)Steps5.Punchforce(1)k=1.1~1.3(why?3reasons:c,tandproperty,cuttingedges)(2)Affectingfactors(4,material,c,t,shape)(3)Methodtoreducethepunchforce(3,heat,staggeredpunches,bevel-cutedges)a)Strippingforce,Knock-outforce,Ejectingforce6.Materialeconomya)Layout:definitions:layout,technicalscrap,structuralscrapclassification:typeofscrap(3),b)Scraps:definitionfunctions(3,compensation,rigidsheet,protectdies)affectingfactors(4,material,shapeanddimension,t,guideandstopway)7.Shavinga)Definitionb)PurposeChapter3Bending1.Deformationfeature(1)Deformationzone(2)Stressandstrainindeformationzone:wideplateandnarrowplate2.Neutralcurvatureofstrain(1)Definition(2)Usages:blanklengthofbendstheminimumbendingradius(3)Feature:inward3.Theminimumbendingradius(1)Definition(2)Affectingfactors:4,material,bendingaxis,edgestateofplate,bendingangle4.Springback(1)Definition:↓r↑,(2)Affectingfactor:6--material,r/t,,shape,bendingmethod,(3)Methodtoreducespringback:4—workpiece,bendingway,compensation,stretchbendingChapter4Drawing1.Deformationprocess(1)Deformationzone(2)Type(3)Stressandstrainstateinfiveparts(name)2.Problemsarisingindrawing(1)WrinkleGenerate:reason,position,timeAffectingfactors:t/Dandmforcertainmaterial,materialPreventingmeasures:blankholder,taperdie,reversedrawing(2)Fracture(tearing)Generate:reason,positionandtimeAffectingfactors:m,dandt,and,,lubricationPreventingmeasures:3.Drawingofcylindricalpart(1)Blank(2)Drawingcoefficient(3)Limitdrawingcoefficient:definitionaffectingfactors(material,die,drawingcondition)(4)Numberofdrawing4.Drawingofothersymmetricalparts(1)Cylindricalpartswithflange:drawingfeatures:[mf]<[m];dF/d,H/d,r/d;H/d;subsequentsimilardrawingprincipal:dFconstant;surplusblank(2)Taperparts:deformationregion(3parts)(3)Sphericalparts:deformationregion(4parts,differentstressstate))5.Drawingofasymmetricalshells(1)Featuresofdrawing:deformationregion(flange),stressstate(2)Limiteddeformationdegreeoffirstdrawing[H/r]affectingfactors:r/B,A/B,t/Bandmaterial6.Otherdrawingmethods(1)Ironingthickness↓c
