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1、辽宁科技学院本科生毕业设计（论文）第15页附录1CategoriesofstampingformingManydeformationprocessescanbedonebystamping,thebasicprocessesofthestampingcanbedividedintotwokinds:cuttingandforming.Cuttingisashearingprocessthatonepartoftheblankiscutformtheother.Itmainlyincludesblanking,punching
2、,trimming,partingandshaving,wherepunchingandblankingarethemostwidelyused.Formingisaprocessthatonepartoftheblankhassomedisplacementformtheother.Itmainlyincludesdeepdrawing,bending,localforming,bulging,flanging,necking,sizingandspinning.Insubstance,stampingformingiss
3、uchthattheplasticdeformationoccursinthedeformationzoneofthestampingblankcausedbytheexternalforce.Thestressstateanddeformationcharacteristicofthedeformationzonearethebasicfactorstodecidethepropertiesofthestampingforming.Basedonthestressstateanddeformationcharacteris
4、ticsofthedeformationzone,theformingmethodscanbedividedintoseveralcategorieswiththesameformingpropertiesandtobestudiedsystematically.Thedeformationzoneinalmostalltypesofstampingformingisintheplanestressstate.Usuallythereisnoforceoronlysmallforceappliedontheblanksurf
5、ace.Whenitisassumedthatthestressperpendiculartotheblanksurfaceequaltozero,twoprincipalstressesperpendiculartoeachotherandactontheblanksurfaceproducetheplasticdeformationofthematerial.Duetothesmallthicknessoftheblank,itisassumedapproximatelythatthetwoprincipalstress
6、esdistributeuniformlyalongthethicknessdirection.Basedonthisanalysis,thestressstateandthedeformationcharacteristicsofthedeformationzoneinallkindofstampingformingcanbedenotedbythepointinthecoordinatesoftheplaneprincipalstress(diagramofthestampingstress)andthecoordina
7、tesofthecorrespondingplaneprincipalstains(diagramofthestampingstrain).Thedifferentpointsinthefiguresofthestampingstressandstrainpossessdifferentstressstateanddeformationcharacteristics.Whenthedeformationzoneofthestampingblankissubjectedtoplanetensilestresses,itcanb
8、edividedintotwocases,thatisσγ>σθ>0,σt=0andσθ>σγ>0,σt=0.In辽宁科技学院本科生毕业设计（论文）第15页bothcases,thestresswiththemaximumabsolutevalueisalwaysatensilestres
