外文献翻译
摘自《制造工程与技术（机加工）》（英文版）《Ma
ufacturi
gE
gi
eeri
ga
dTech
ologyMachi
i
g》机械工业出版社2004年3月第1版
P560564页
美s卡尔帕基安Seropekalpakjia
sr施密德Steve
RSchmid原文：著
209MACHINABILITYThemachi
abilityofamaterialusuallydefi
edi
termsoffourfactors1、Surfacefi
isha
di
tegrityofthemachi
edpart2、Toollifeobtai
ed3、Forcea
dpowerrequireme
ts4、Chipco
trolThusgoodmachi
abilitygoodsurfacefi
isha
di
tegritylo
gtoollifea
dlowforceA
dpowerrequireme
tsAsforchipco
trollo
ga
dthi
stri
gycuredchipsif
otbroke
upca
severelyi
terferewiththecutti
goperatio
bybecomi
ge
ta
gledi
thecutti
gzo
eBecauseofthecomplex
atureofcutti
goperatio
sitisdifficulttoestablishrelatio
shipsthatqua
titativelydefi
ethemachi
abilityofamaterialI
ma
ufacturi
gpla
tstoollifea
dsurfacerough
essare
fge
erallyco
sideredtobethemostimporta
tfactorsi
machi
abilityAlthough
otusedmucha
ymoreapproximatemachi
abilityrati
gsareavailablei
theexamplebelow2091Machi
abilityOfSteelsBecausesteelsareamo
gthemostimporta
te
gi
eeri
gmaterialsas
otedi
Chapter5theirmachi
abilityhasbee
studiedexte
sivelyThemachi
abilityofsteelshasbee
mai
lyimprovedbyaddi
gleada
dsulfurtoobtai
socalledfreemachi
i
gsteelsResulfurizeda
dRephosphorizedsteelsSulfuri
steelsformsma
ga
esesulfidei
clusio
sseco
dphaseparticleswhichactasstressraisersi
theprimaryshearzo
eAsaresultthechipsproducedbreakupeasilya
daresmallthisimprovesmachi
abilityThesizeshapedistributio
a
dco
ce
tratio
ofthesei
clusio
ssig
ifica
tlyi
flue
cemachi
abilityEleme
tssuchastelluriuma
dsele
iumwhicharebothchemicallysimilartosulfuractasi
clusio
modifiersi
resulfurizedsteelsPhosphorusi
steelshastwomajoreffectsItstre
gthe
stheferritecausi
gi
creasedhard
essHardersteelsresulti
betterchipformatio
a
dsurfacefi
ishNotethatsoftsteelsca
bedifficulttomachi
ewithbuiltupedgeformatio
a
dpoorsurfacefi
ishTheseco
deffectisthati
creasedhard
esscausestheformatio
ofshortchipsi
steadof
fco
ti
uousstri
gyo
estherebyimprovi
gmachi
abilityLeadedSteelsAhighperce
tageofleadi
steelssolidifiesatthetipofma
ga
esesulfidei
clusio
sI
o
resulfurizedgradesofsteelleadtakestheformofdispersedfi
eparticlesLeadisi
solublei
iro
coppera
dalumi
uma
dtheiralloysBecauseofitslowshearstre
gththereforeleadactsasasolidlubrica
tSectio
3211a
dissmearedoverthetoolchipi
terfaceduri
gcutti
gThisbehaviorhasbee
verifiedbytheprese
ceofhighco
ce
tratio
sofleado
thetoolsidefaceofchipswhe
machi
i
gleadedsteelsWhe
thetemperatureisr