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1、锻造基础知识The1.iscalledtheforgingforgingandstamping,forgingmachineryisusedthehammer,anvil,punchorpressureisappliedtotheblankthroughthemoldtoproduceplasticdeformation,soastoobtainthemoldingmethod,therequiredshapeandsizeoftheparts.P"Z7,d&,T9,U7{2.whenthetemperatureismorethan300-400deg
2、rees(thebluebrittlenesszoneofthesteel)reaches700-800degreescentigrade,thedeformationresistancewilldecreasesharply,andthedeformationenergywillalsobegreatlyimproved.Accordingtotheforgingindifferenttemperatureareas,accordingtothedifferentrequirementsofforgingqualityandforgingproces
3、s,itcanbedividedintothreeformingtemperatureareas,coldforging,warmforgingandhotforging.Thereisnostrictboundaryforthistemperaturezone.Generallyspeaking,theforginginatemperaturezonewithrecrystallizationiscalledhotforging,andtheforgingwithoutheatingatroomtemperatureiscalledcoldforgi
4、ng.9Pp*T+mL#Zm3
5、$);}3.lifeofforgingdie(hotforging2-5,warmforging1-2,coldforging2-5WAN)l&,w#,y+,B%,Q3,D4.whenforgingatlowtemperatures,thesizeoftheforgingsvarieslittle.Forgingat700degreesCelsius,theformationofoxideskinless,andthesurfacewithoutdecarburization.Therefore,aslongasthed
6、eformationcanbewithintherangeofformingenergy,coldforgingiseasytoobtainverygooddimensionalaccuracyandsurfacefinish.Aslongasthetemperatureandlubricationcoolingarewellcontrolled,agoodaccuracycanbeobtainedbywarmforgingattemperaturesbelow700.Becausethedeformationenergyanddeformationr
7、esistanceareverysmallinhotforging,largeforgingswithcomplexshapecanbeforged.Inordertoobtainhighdimensionalprecisionforgings,theycanbemachinedbyhotforginginthe900-1000degreetemperaturerange5.billettoproducedeformationandworkhardeningincoldforging,theforgingdieunderhighload,therefo
8、re,requirestheuseofhighstrengthdieandprocessingmethodisadoptedtopreventwearandadhesivehardfilm;T:m:y,_0`3Z4E6eg!6.generallyspeaking,themechanicalpropertiesofcastingsarelowerthanthoseofthesamematerial.Inaddition,theforgingprocessensuresthecontinuityofthemetalfibertissue,Thefibers
9、tructureoftheforgingisconsistentwiththeshapeoft
