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1、第四篇金属塑性加工变形力的计算方法（Fourthcalculationmethodsofdeformationforceinmetalplasticprocessing）FourthcalculationmethodsofdeformationforceinmetalplasticprocessingTheseventhchapteristheengineeringanalysisofdeformationforceinmetalplasticprocessingSection7.1outlinesWhenmetalisplasticworking,the
2、externalforcerequiredbytheequipmenttomovethemetaltoproduceplasticdeformationiscalleddeformationforce.Deformationforceisthebasicmechanicalparameterfordeterminingtheequipmentcapacity,designingthetoolingcorrectly,drawinguptheprocessingrulesreasonablyanddeterminingtheshapeandsizeofthe
3、blank.Thedeformationforceisappliedtothedeformedworkpiecebytheworksurface,suchasforging,rollingandextrusion,andtheinterfacebetweentheplasticzoneandtheelasticzoneatthefront.Thedeformationforceatthesametimeisgenerallythesumoftheprojectionvaluesoftheworkstressontheworkingfaceinthedire
4、ctionofthedeformationtoolmovement.Therefore,thedeformationforcePisoftenexpressedas:EMBEDEquation.3(7-1)Intheformula,EMBEDEquation.3-workstress,generallyitisunevenontheworksurface,commonlyusedunitpressureEMBED,Equation.3means.S-workarea.Byformula(7-1),itisnecessarytoknowtheareaonth
5、eworksurfaceandthedistributionlawoftheworkingstressonthefacetodeterminethedeformationforce.Iftheworksurfaceissimple,thecalculationofitsareaissimple,butingeneral,theshapeoftheworksurfaceisoftencomplex,sothatitisnoteasytocalculate.Atthistime,wecanusetheprojectionofworkfaceinsteadoff
6、orceprojection.Fig.7-1contactsurfacedrawingduringdieforging7-2projectionofworkingfaceprojectioninsteadofforceFig.7-2isapartofthecontactsurfacebetweentheforgingdieandtheforgingbilletinFig.7-1,andtheworkstressdistributionontheABcurveisshownasshowninthedashedlineinthefigure.Actingont
7、heareaunitDS,thepressureDPis:EMBEDEquation.3Theprojectioninthedirectionofmovementofthehammerpressurevalue:EMBEDEquation.3(7-2)Intheformula,EMBEDEquation.3istheworkingstressontheDSfaceelement,theanglebetweentheEMBEDEquation.3andthemovingdirectionoftheforgingdie.AndtheEMBEDEquation.
8、3istheprojectionoftheareaoftheare
