冲压成形与板材冲压

Characteristics and Sheet Metal Forming 1．The article overview Stamping is a kind of plastic formi

CharacteristicsandSheetMetalForming 1Thearticleoverview ． Stampingisakindofplasticformingpro__ssinwhichapartisprodu__dby meansoftheplasticformingthe__terialundertheactionofa___.Stampingis usuallycarriedoutundercoldstate,soitisalsocalledstamping.Heatstampingis usedonlywhentheblankthicknessisgreaterthan8~100mm.Theblank__terial forstampingisusuallyintheformofsheetorstrip,andthereforeitisalsocalled sheetmetalforming.Somenon-metalsheets(suchasplywood,micasheet, a__estos,leather)canalsobeformedbystamping. Stampingiswidelyusedinvariousfieldsofthemetalworkingindustry,andit playsacrucialroleintheindustriesfor__nufacturingautomobiles,instruments, militarypartsandhouseholdelectricalapplian__s,etc. Thepro__ss,equipmentand___arethethreefoundationalproblemsthat neededtobestu___dinstamping. Thecharacteristicsofthesheetmetalformingareasfollows: (1)High__terialutilization (2)Capacitytoprodu__thin-walledpartsofcomplexshape. (3)Goodinterchangeabilitybetweenstampingpartsduetoprecisioninshape anddimension. (4)Partswithlightweight,high-strengthandfinerigiditycanbeobtained. (5)Highproductivity,easytooperateandtorealizemechanizationand auto__tization. The__nufactureofthestamping___iscostly,andthereforeitonlyfitsto __ssproduction.Forthe__nufactureofproductsin__allbatchandrichvariety, the______stamping___andthenewequipmentsuchasastamping__chining __nter,areusuallyadoptedtomeetthe__rketde__nds. The__terialsforsheetmetalstampingincludemildsteel,copper,aluminum, __gnesiumalloyandhigh-plasticityalloy-steel,etc. Stampingequipmentincludesplateshearpunchingpress.Theformershears plateintostripswithadefinitewidth,whichwouldbepressedlater.Thelatercan beusedbothinshearingandforming. 2Characteristicsofstampingforming ． Therearevariouspro__ssesofstampingformingwithdifferentworkingpatterns andnames.Butthesepro__ssesaresimilartoeachotherinplasticdefor__tion. Therearefollowingconspicuouscharacteristicsinstamping: 1Thefor__perunitareaperpendiculartotheblanksu_____isnotlargebut （）． isenoughtocausethe__terialplasticdefor__tion.Itismuchlessthantheinner stressesontheplateplanedirections.Inmostcasesstampingformingcanbe treatedapproxi__telyasthatoftheplanestressstatetosimplifyvastlythe theoretical____ysisandthecalculationofthepro__ssparameters. 2Duetothe__allrelativethickness,theanti-instabilitycapabilityoftheblank （）． isweakundercompressivestress.Asaresult,thestampingpro__ssisdifficultto