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ID:35597799
大小:50.50 KB
页数:6页
时间:2019-03-30
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1、NewtoolsmaximizenewmachinedesignsTheprimarytoolingconcernswhenmachiningaluminumare:minimizingthetendencyofaluminumtosticktothetoolcuttingedges;ensuringthereisgoodchipevacuationformthecuttingedge;andensuringthecorestrengthofthetoolsissufficienttowithstandthecuttingforc
2、eswithoutbreaking.TechnologicaldevelopmentssuchastheMakinoMAG-Seriesmachineshavemadetoolingvendorsrethinktheanystate-of-the-artmachinetechnology.Itisvitaltoapplytherighttoolingandprogrammingconcepts.Materialscoatingsandgeometryarethethreeelementsintooldesignthatinterr
3、elatetominimizetheseconcerns.Ifthesethreeelementsdonotworktogether,successfulhigh-speedmillingisnotpossible.Itisimperativetounderstandallthreeoftheseelementsinordertobesuccessfulinthehigh-speedmachiningofaluminum.MinimizeBuilt-UpEdgeWhenmachiningaluminum,oneofthemajor
4、failuremodesofcuttingtoolsthematerialbeingmachinedadherestothetoolcuttingedge.Thisconditionrapidlydegradesthecuttingabilityofthetool.Thebuilt-upedgethatisgeneratedbytheadheringaluminumdullsthetoolsoitcannolongercutthroughthematerial.Toolmaterialselectionandtoolcoating
5、selectionarethetwoprimarytechniquesusedbytooldesignerstoreduceoccurrenceofthebuilt-upedge.Thesub-microngraincarbidematerialrequiresahighcobaltconcentrationtoachievethefinegrainstructureandthematerial’sstrengthproperties.Cobaltreactswithaluminumatelevatedtemperatures,w
6、hichcausesthealuminumtochemicallybondtotheexposedcobaltofthetoolmaterial.Oncethealuminumstartstoadheretothetool,itquicklyformsabuilt-upedgeonthetoolrenderingitineffective.Thesecretistofindtherightbalanceofcobalttoprovideadequatematerialstrength,whileminimizingtheexpos
7、edcobaltinthetoolsforaluminumadherenceduringthecuttingprocess.Thisbalanceisachievedusingcoarse-grainedcarbidethatprovidesatoolofsufficienthardnesssoastonotdullquicklywhenmachiningaluminumwhileminimizingadherence.ToolcoatingsThesecondtooldesignelementthatmustbeconsider
8、edwhentryingtominimizethebuilt-upedgeisthetoolcoating.ToolcoatingchoicesincludeTiN,TiAIN,AITiN,chromenitrides,zirconiumnitri
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