可变径向切深下螺旋齿球头铣刀微细铣削.pdf

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1、机床与液压Mar．2014HydromechatronicsEngineeringVo1．42No．6DOI：10．3969／j．issn．1001-3881．2014．06．017Investigation0fhelicalballmicromillingwithvariable●●来radiallmmerSl0nzi—yangCAO，Xiao—hongXUE，HuaLI，Li—huaGUOCollegeofMechanicalEngineering，SuzhouUniversityofScienceandTechnology，Suzhou215009，ChinaAbstract：Mi

2、cromillingcanfabricateminiaturizedcomponentsusingmicroendmillathighrota-tionalspeeds．Theanalysisofcuttingforceandstabilityinmicromilingplaysanimpo~antroleincharacterizingthecutingprocess．AnumericalanalysismethodispresentedtoinvestigatethehelicalbalImicromilingprocesswithvariableradiaIimmersion．Th

3、eschematicmodelofballmi-cromillingisconstructedandthecutingforcecalculationformulaisderived．Andthen．adetailedtimedomainsimulationformicromilingforcesbetweenhelicalbalIandsquareendmilsiscarriedout，andtheresultsarecompared．Inaddition，thestabilitylobeofballmicromillingwithlowra。diaIimmersionisresear

4、chedindetaiIthroughtimedomainandfrequencydomainmethods．Final-ly，theHopfandflipbifurcationsareexploredandthesimulationresultsbetweenvariablestabilitycasesaredeeplycomparedandanalyzed．Keywords：HelicalbalIendmil1．Micromilling．Radialimmersionlutionsamplingtechniquecombinedwithcapacitive1．Introduction

5、measurementsofthetoolshankdisplacementsinthefeedandnormaldirectionsduringcutting，theyfoundThereisastrongdemandfromvariousindustriesthatsomeunstablelowradialimmersioncutsgaveforminiaturedevicesandcomponentswithcomplexdiscreteclustersofonce·-per··revolutionsampledmicrosealefeaturesfabricatedonavari

6、etyofmateri．pointswhenplottedinthe—Yplane，whileothersals．Microendmillingcanovercomethelimitationspresentedellipticaldistributions．Theysubsequentlyofsemi-conductorbasedprocessingtechniquesbyuti．showedthatthisbehaviorwasthemanifestationoftwo1izingminiatureballmillstomakecomplex3Dpartsdifferenttypes

7、ofinstability[7-8]．TraditionalHopfwithnoneedforexpensivemasksf1-3]．Inaddition，bifurcationleadstotheellipticaldistributionofperi—duetohighdynamicinstability，itisveryimportantodicallysampledpoints．Thesecondinstabilitytyp