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1、Trans.NonferrousMet.Soc.China23(2013)377−384Pipereductionofminiatureinnergroovedcoppertubesthroughrotaryswagingprocess1112Long-shengLU,YongTANG,Wei-qiangFANG,JiangCHENG1.KeyLaboratoryofSurfaceFunctionalStructureManufacturingofGuangdongHighEducationInstitutes,SouthChinaUniversityofTech
2、nology,Guangzhou510640,China;2.SchoolofChemistryandChemicalEngineering,SouthChinaUniversityofTechnology,Guangzhou510640,ChinaReceived29October2011;accepted12March2012Abstract:Arotaryswagingmachinewasappliedtofabricatingpipereductionforminiatureinnergroovedcoppertube(MIGCT)heatpipes.Co
3、mparedwithconventionalswagingmethod,theaxialfeedofthedesignedrotaryswagingmachinewasreachedbyaconstantpushingforce.Thedeformationofgroovesinpipereducedsectionduringrotaryswagingwasanalyzed.Theshrinkageandextensibilityofpipereductionweremeasuredandcalculated.Furthermore,fouraspects,inc
4、ludingouterdiameter,surfaceroughness,extensibilityandprocessingtimeofpipereduction,whichwereinfluencedbythepushingforce,wereconsidered.Theresultsshowthatthetubewallthicknessincreasesgraduallyalongthez-axisatsinkingsection.However,theouterdiameters,surfaceroughnessandmicro-cracksatredu
5、cedsectiontendtodecreasealongthez-axis.Besides,theeffectofvariationinthepushingforceontheextensibilityislimitedwhileanincreaseinthepushingforceresultsinadecreaseofsurfaceroughness.Therefore,alargepushingforcewithinthelimitisbeneficialtopipereductionmanufacturingduringrotaryswagingproc
6、ess.Keywords:rotaryswaging;radialforging;steppedtube;pipereduction;innergroovedtube;tubesinking;pushingforce;surfaceroughnessIncrementalprocesscreatesdeformationwithin1Introductionregionsoftheworkpiece,anditsmainadvantageliesinthelowdeformationload,whichmakesitabletoHeatpipesarewidely
7、usedforthermalcontrolinmanufacturethin-walledtubeproducts[3].Amongtheelectronicproducts,suchasCPUs,LEDsandsolarmanyincrementalformingtechnologies,theballcollectors.Generally,theminiatureinnergroovedcopperspinning,radialforgingandrotaryswagingprocessestube(MIGCT)heatpipeisoneofthemosta
8、ttrac
