掛鉤軸內(nèi)螺紋冷擠壓成形方法研究.pdf

1、重慶大學(xué)碩士學(xué)位論文掛鉤軸內(nèi)螺紋冷擠壓成形方法研究姓名：馬冬申請學(xué)位級別：碩士專業(yè)：材料加工工程指導(dǎo)教師：周杰20041030重慶大學(xué)碩士學(xué)位論文英文摘要ABSTRACTThestudyofthispaperiscombinedwiththeexploitationandthemanufactureofinternalthreadofCl95knuckleaxisofautomobileThecrisisproblemofprocess

2、ingisinternalthreadsformingAlthoughcuttingistheconventionalmethodusedforinternalmachingitisnotonlyinefficientbutalsocutsoffthemetalwoolsendreducestheinternalthreadqualityExtrusionprocessingofinternalthreadsisaadvancedpro

3、cessingtechnologywithlittlechiporevenchiplessItmakesthemetalwoolscontinuous，andincreasesthedrawresistanceintensityendfatigueresistanceoftheinternalthreadsCold毫xtrusionprocessingofinternalthreadsisstudieddeeplythroughcomb

4、inedwiththefiniteelementmethodsimulationandexperimentsinthepaperAtfirsttechniquescharacteristicofcoldextrusionprocessingofinternalthreadsisanalyzed，andthedeformeddisciplineofmetalmaterialarestudied，thatisextrusionforming

5、ofinternalthreadisaprocessofpartialformingmaterialflowinginthediameterdirectionontheotherhand，materialflowingintheaxialdirection，aswellastheaxialstrainbeingthebiggestsn帆makeitverydifficulttoformthanotherformingmethodThen

6、，accordingtotechniquescharacteristicofcoldextrusionprocessingtheresultsareconcludedthatthestructureofextrusiontap，diameterofprefabricatehole，extrusionspeedandtheselectionoflubricatingoilisthemaininfluencingfactionsofcold

7、extrusionprocessingofinternalthreadsThen，thestructureendtheparameterofextrusiontapisdetermineandformulaofdiameterofprefabricateholeiSdeductedthroughtheorycalculationwhentheinternalthreadismachinedbycoldextrusionprocessin

8、gInthispapertheprocessingdisciplineofcoldextrusionprocessingofinternalthreadsisanalyzedbyDEFORM一3D(afiniteelementmethodsimulationsoftware)，endthevariationaldisciplineofextrusiontorqueissimulatedwhendiameterofprefabricate

9、holeendextrusionspeedisvaryFinallythebestvaluesofthediameterofprefabricateholeandextrusionspeedisdeterminedthroughoptimizesimulationresultsIntheend，formingexperimentsstudyofcoldextrusionisprocessed，experimentsresultsshow

10、sthatinternalthreadofCl95knuckleaxiscarlbeformedbycoldextrusionmethod，endtheextrusiontorqueisvariedwhendiameterofprefabricateholeendextrusionspeedisaseriesofdifferentvalueTheoryofcoldextrusionprocessingofintemalthreads，F(xiàn)