沖壓是塑性成形加工方法之一以板料(金屬

1、Chapter1Introduction1.DefinitionofstampingaplasticfmingmethodRawmaterialsheetmetalnonmetalTooldieEquipmentpressResultseparatedefmwkpiecewithshapedimensionproperty.沖壓是塑性成形加工方法之一。以板料（金屬、非金屬）為原料，利用模具在壓力機上對板料施加壓力使其分離或變形獲得所需零

2、件。所需零件具有一定形狀、尺寸和性能。2.BasicrequirementusedinsheetfmingFmabilitysurfacequalitytoleranceinthicknesseconomy3.Basicprocesses(1)cuttingprocesses（分離工序）:shearingblankingpunchingpartinglancingshaving(2)plasticdefmationprocesses（成

3、形工序）:bendingdeepdrawingspinningbulgingflangingChapter2ShearingBlankingPunching1.ShearingEquipment:straightparallelcutterst↑B↓straightinclinedcutterst↓B↑2.Blankingpunchingmechanism(1)3defmationstages(2)Featuresofsheareded

4、gesofthesheetmetal4partsrolloverburnishzonefractureburr(reason)mainaffectingfacts(3aspects)3.BlankingpunchingclearanceTheeffectoftheamountofclearancebetweenthepunchdieontheoperationprocess(3)featuresofshearededges(4)dime

5、nsionalprecision(5)fcepower(6)dielife4.Thecalculatingofpunchdiebladesize(1)Principlesofcalculation:benchmarkslimitdimension(2)Methodsofcalculation:separatelycodinately(3)Steps5.Punchfce(1)k=1.1~1.3(why3reasons:ctproperty

6、cuttingedges)?????tLkF2.Problemsarisingindrawing(1)WrinkleGenerate:reasonpositiontimeAffectingfacts:tDmfcertainmaterialmaterialPreventingmeasures:blankholdertaperdiereversedrawing(2)Fracture(tearing)Generate:reasonpositi

7、ontimeAffectingfacts:mdtlubricationprdrbs??Preventingmeasures:3.Drawingofcylindricalpart(1)Blank(2)Drawingcoefficient(3)Limitdrawingcoefficient:definitionaffectingfacts(materialdiedrawingcondition)(4)Numberofdrawing4.Dra

8、wingofothersymmetricalparts(1)Cylindricalpartswithflange:drawingfeatures:[mf][m]dFdHdrdHdsubsequentsimilardrawingprincipal:dFconstantsurplusblank(2)Taperparts:defmationregion(3parts)(3)Sphericalparts:defmationregion(4par

9、tsdifferentstressstate))5.Drawingofasymmetricalshells(1)Featuresofdrawing:defmationregion(flange)stressstate(2)Limiteddefmationdegreeoffirstdrawing[Hr]affectingfacts:rBABtBmaterial6.Otherdrawingmethods(1)Ironingthickness