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1、厩过甙榻擦饥园萆矫逢稹Metal-cuttingprocess瞳鳋村委豆抟蒡旖蕖踝瑕Metal-cuttingprocessesareextensivelyusedinthemanufacturingindustry.Theyarecharacterizedbythefactthatthesizeoftheoriginalworkpieceissufficientlylargethatthefinalgeometrycanbecircumscribedbyit,andthattheunwantedmeterialisremovedaschips,particles
2、,andsoon.Thechipsareanecessarymeanstoobtainthedesiredtolerances,andsurfaces.Theamountofscrapmayvaryfromafewpercentto70%~80%ofthevolumeoftheoriginalworkmaterial.窘赤嗜骅巽佃蛟铯箦诃癞Owingtotheratherpoormaterialutilizationofthemetal-cuttingprocesses,theanticipatedscarcityofmaterialsandenergy,andi
3、ncreasingcosts,thedevelopmentinthelastdecadehasbeendirectedtowardanincreasingapplicationofmetal-formingprocesses.However,diecostsandthecapitalcostofmachinesremainratherhigh;consequently,metal-cuttingprocessesare,inmanycases,themosteconomical,inspiteofthehighmaterialwaste,whichonlyhasv
4、alueasscrap.Therefore,itmustbeexpectedthatthematerialremovalprocesseswillforthenextfewyearsmaintaintheirimportantpositioninmanufacturing.Furthermore,thedevelopmentofautomatedproductionsystemshasprogressedmorerapidlyformetal-cuttingprocessesthanformetal-formingprocesses.崖韫焦虾噤陇疮跸钾弯胍Inme
5、tal-cuttingprocesses,theimprintingofimformationiscarriedoutbyarigidmediumoftransfer,whichismovedrelativetotheworkpiece,andthemechanicalenergyissuppliedthroughthetool.Thefinalgeometryofthetoolandthepatternofmotionsofthetoolandtheworkpiece.Thebasicprocessismechanical:actually,ashearinga
6、ctioncombinedwithfracture.属掴逞受澶猊骚械贻叻曲Asmentionedpreviously,theunwantedmaterialinmetal-cuttingprocessesisremovedbyarigidcuttingtool,sothatthedesiredgeometry,tolerances,andsurfaceroughnessareobtained.Examplesofprocessesinthisgroupareturning,drilling,reaming,milling,shaping,planing,broac
7、hing,grinding,honing,andlapping.楗牿还捱壶鳍橼厌速吵疠Mostofthecuttingormachiningprocessesarebasesonatwo-dimensionalsurfacecreation,whichmeansthattworelativemotionsarenecessarybetweenthecuttingtoolandtheworkmaterial.Thesemotionsaredefinedastheprimarymotion,whichmainlydeterminesthecuttingspeed,an
8、dthef
