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Source:DESIGNFORMANUFACTURABILITYHANDBOOK
CHAPTER4.13
PARTSCYLINDRICALLY
GROUNDONCENTER-TYPE
MACHINES
WesMowry
之nn
WorcesterMasSacRatsetts
THEPROCESSES
Twobasicprocessesareusedforgrindingexternalcylindricalsurfaces:center-type
grinding,inwhichtheworkpieceisclampedtothemachinespindle，andcenterless
grinding、inwhichtheworkpiecerotatesfreelybetweentwoOpposinggrinding
wheels、
Incenter-typegrinding,theworkpiecenormallyisheldbetweenpointed“centers”
asinalathe.However,italsomaybeheldbyachuckorbemountedonafaceplate.
Thegrindingwhcel(cxccptfortapercdsurfaccs)rotatcsonanaxisparalleltothatof
thework:itisfedperpendicularlytoandfromlthework.Whennecessary，transverse
Imotionbetweenthewheelandtheworkalsoisprovidedbymovementofthehead-
Stock-tailstocktableoronsomelargemachines，bymovementofthewheel,The
hecadstock-tailstocktablcalsocanswiveltoprovidcgrindingoftapcredsurfaces.Thc
workandthewheelaredrivenbyseparatemotorssothattheymoveinOpPositedirec-
tionsatthepojntofcontact.Whennecessary,steadyrestsareUsedtoSupportthework
duringgrinding，
TYPICALAPPLICATIONS
Shaftsandpinsarecommonlygroundoncenter-typegrindingmachines，Partswith
stcps(multiplcdiamctcrs)，tapcrs，andgroundformsarcsuitablefortheprocess.
Diamerersaslargeas1.8m(72in)canbegroundoncommerciallyavailableequip-
Iment.WorkpiecedeflectionlimitstheminjimumdiameterthatispracticaltoProcess.
(Centerlessgrindingjsmoresuitableforthinandlongpins.)APracticalrmjinimum
diamecterforshortcylindricalclementsisperh
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