金属切削原理与刀具试题.docx
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金属切削原理与刀具试题.docx
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金属切削原理与刀具试题
金属切削原理与刀具试题(Principlesofmetalcuttingandcuttingtools)
Metalcuttingprinciplesandcuttingtools.TXTisatimewhentabooscollapse,andnoonecanstopyou.Onlyyoucanstopyourself,andthemoretabooyouhave,thelessachievementsyouhave.Self-abasementhasmanylevels,thehighestlevelofinferiorityistobragaboutwhattodoisgenius.Metalcuttingprinciplesandknives
(1)
1,fillintheblanks(2points,20points)
1.Therearemanykindsoftoolmaterials,commonlyusedmetalmaterials(toolsteel),(highspeedsteel),(hardalloy);Non-metallicmaterialshave(diamond),(cubicnitride),etc.
InthegeometricalAngleoftheknife,thecommonAngleis(thefrontAngle),(thelatterAngle),(themainAngle),(theAngleoftheAngle),(theAngleoftheAngle),and(thelatter)six.
3.Thecuttingfactorincludes(cuttingdepth),(quantityoffeed)and(cuttingspeed)three.
4.Duetothedifferentmaterialsandcuttingconditionsoftheworkpiece,thecuttingtypehas(stripchip),(sectionchip),(granularchip),and(crushedchip)four.
5.Thewearofthecutterhasnormalwearandtear.Therearethreetypesofnormalwear(frontwear),(wearaftertheLord)and(wear).
6.Whentoolsteelcuttingtemperatureexceeds(200degrees),themetallographicstructurechanges,thehardnessofthetooldecreases,thecuttingabilityislost,andthetoolweariscalled(phasechangewear).
7.Whenworkingwithbrittlematerials,thecuttingforceofthecutteriscenteredaround(thetipoftheblade),and(smallerfrontcorners)and(smallerrearcorners).
8.Theperformanceofthecuttingpartofthetoolmustbeof(highhardness),(goodstrengthandtoughness),(goodabrasionresistance)and(goodtechnologyandeconomy).
9.Topreventtheformationofcumulativetumor,thecuttingspeedcanbeadopted(highspeed)or(lowspeed).
10.Writetheusualnumberofthefollowingmaterials:
carbontoolsteel(T8A,T10A,T12A);Alloytoolsteel(9SiCr,CrWMn);Highspeedtoolsteel(W18Cr4V,W6Mo5Cr4V2).
1.Itiseasytoform"C"chipcuttingsinthemedium-to-backbite.
2.Thecuttingspeedofthecutterisgenerallywithintherangeof(mediumspeed).
3.Duringthecuttingprocess,themainAnglekapparincreases,andthecuttingforceFP(decreases).
4.Whenthecuttingtemperatureofhighspeedsteeltoolsexceeds(550~600),thetoolmaterialchangesingoldphase,causingthetooltowearoutrapidly.Thisphenomenonisknownas(phasechange)wear.
5.Whentheshavingsarethemostdeformed,thecuttingsarealsothemostfrictionalwiththecutter.Inthecaseofthecutter,theheattransferisnoteasy,andthecuttingtemperatureisthehighest.
6.Themostcommonconditionofnormalwearwhencuttingmetalmaterialiswearandtear.
ThecuttingforceFCdoubleswhenthesizeofthebackisdoubled.Butwhenthequantityofsupplyfdoubled,thecuttingforceFCincreased(0.8).
8.Theinfluenceofcuttingamountontoollifeismainlyinfluencedbytheheightofcuttingtemperature,sothemaximumimpactofcuttingtoollifeis(cuttingspeed).
9.Aftertheformingtoolisworndown,thebladeshouldbesharpened(frontedge),
Afterthebladeisworndown,itcanbeusedtomaintaintheprofileaccuracy.
10.Inthemediumandlow-speedcuttingplasticmetalmaterials,thecuttingtoolcanbewornbythecontactpressureandcuttingtemperatureoftheworkpiece.
11.Cuttingheatismainlycarriedoutthrough(cuttings)and(cuttingtools).
12.Thebluntstandardofthecutterisusuallyfollowedbythewearvalue(VB).
13.Duringthethreephasesofthetoolwearprocess,asthecuttingprocessingapplicationis(normalwear)stage.
14.Whenturningslendershaftparts,inordertoreducetheeffectofradialforceFp,mainAnglekapparpredominate,itisadvisabletouse(morethan60°)perspective.
15.Whenthemetalmaterialswithlargecuttingplasticareformed(strip)chip,thechipcanbeformedwhencuttingbrittlematerials.
(6points,30points)
1.BriefdescriptionofwedgeAngle:
wedgeAngleistheAnglebetweenthefrontandrearedgeoftheknife,anditssizeisdeterminedbythefrontAngleandrearAngle.
2.Briefdescriptionoftoollife:
toollifeisthecuttingprocessingtimeexperiencedbycuttingtoolfrombeginningtoend.
3.Briefdescriptionofthecuttingfactor:
thecuttingamountincludes:
cuttingspeed,quantityoffeed,threeelementsofbackfeedingknife.
ThesharpAngleoftheknife:
theAngleoftheknifeAngleistheAnglebetweenthemaincuttingedgeandtheauxiliarycuttingedgeinthebaseplane.
WhatisthefunctionoftherearAngle?
Howtomakeareasonablechoice?
TherearAnglemainlyaffectsthefriction,machiningaccuracy,cuttingedgestrengthanddurabilityofthetool.Topreventextrusionfriction,alargerrearAngleshouldbeusedtopreventextrusionfriction.Inroughmachining,thelowerbackAngleshouldbeusedtoincreasethestrengthoftheblade.
1.AngleofwedgeAngle(frontedge)and(rearedge)
2.ThemainchemicalcomponentsofthecementedcarbideareCo,(TiC)and(WC),withthemore(TiC)content,thehigherthehardnessofthehardalloy,thebettertheheatresistance,butthegreaterthebrittleness.
Theprocessofcuttingshavingsisessentiallytheprocessofworkpiecematerial(shearslipandcrushfriction).Inordertofacilitatethemeasurement,thedeformationdegreeofthecuttingprocessisapproximatetobeusedtomeasure.
4.Intheprocessofmetalcutting,itiseasytoproducethecraniomainthe(medium)velocityplus(plastic)materials,whichwillhaveacertaineffectonthecuttingprocess,soastoavoidduringprocessing.
5.Whentheoutsideroundturning,theAngleofinfluenceofcuttingtemperatureonthecuttingtemperatureisgreaterthanthatof(gamma)andKr.
6.Inthecaseoftherigidityoftheprocesssystem,thecuttingstandardshouldbemorethan(large).Itisnecessarytostipulatethebluntstandardof(small)whenfinishingmachining.
7.Thecommonlyusedcuttingfluidhasaqueoussolution,(emulsion)and(cuttingoil)threemajorcategories.Whenusingcarbidecuttingtools,thecuttingfluidisnotnormallyusedbecauseoftheredhardnessofthetool.
8.Theuseofindexableturningtoolsishighlyproductivebecauseitreducestheauxiliarytimerequiredfor(replacement)and(sharpening),soitisespeciallysuitableforautomaticproduction.
Theworstpartofthedrillisinthe(horizontal)part.Themostvulnerablepartofthedrillisatthetip.Theaxialforceduringdrillingisproducedbytheblade.
10.
Inthemainsection(orthogonalplane)thethreecoordinateplanesintheframeofreferencearethe(base),(orthogonalplane)and(maincuttingplane),andtherelationis(perpendicular)toeachother.
11.Itcanbeusedtoreducethecuttingwidthandfacilitatethecleaningofcuttings,whichcannotbeusedwhenpulling(brittle)materials.
12.Whenthesurfacequalityofthemachiningsurfaceishigh,theradiusofthebladeisrelativelysmall.
13.Whengrindingflatandinnerholes,thesizeofthegrindingwheelshouldbesmallerthanthatoftheoutercircle.Thehardnessissmallerandthegrindingwheelislarger.
14.Whenmachiningtheslendershaftparts,thebladeofthecutterisoftentakenasthevalueof(positive)valuebecauseofthereductionofthebackoftheknife
).
(2points,10points)
1.Residualstressandresidualstressreferstothestressofresidualstressinmetalaftertheendofthecuttingprocess,whichisshownastensilestressorresidualstress.
2.AnglecuttingandactionandAnglecuttingarethecuttingspeedofthecuttingspeedwhichisnotperpendiculartothemaincuttingedge.TheactionincreasestheactualcuttingAngleandchangesthedirectionofthecutting.
A:
cuttingprocessingreferstothedegreeofdifficultyincuttingandprocessingofanartifact.
4.?
?
Briefdescriptionofcutterlife:
5.?
?
Brieflydescribethecuttingfactor
(5points,15points)
Whatarethemaindisadvantagesofcommontwistdrill?
Howtoimprove?
Maindisadvantages:
(1)thefrontAngledistributionofthemaincuttingedgeofthetwistdrillisunreasonable,andtheouterspaceissmall;
(2)thelengthofthemaincuttingedgegreatlyaffectsthecrimpingofthechip;
(3)themaincuttingedgeissmallandlong(4)themaincuttingedgeandthenegativecuttingedgecornerstrengthlowheatdissipation.Improvementmeasures:
(1)grindingtheblade
(2)grindingtheblade(3)grindingthecuttinggroove(4)grindingedge.
2.Howdoesthecuttingdepth(backfeedingknifequantity)apandthequantityfaffectthecuttingforce?
Trytodetailthelawofinfluence.Whatisthefunctionoftheposteriorhorn?
Howtomakeareasonablechoice?
Influence:
asthecuttingdepthincreases,thecuttingforceincreaseswhentheforceincreases
Thecuttingspeedincreaseswithlessvariationofthecuttingforce.
Rule:
>f.>
Effect:
1.Influencethefrictionbetweenthetoolandtheprocessingsurface
2.Influencemachiningaccuracy
3.Influencetoolcuttingstrengthanddurability
ChoiceofrearAngle:
WhenchoosingtherearAngle,themainconsiderationisthefollowingtwofactors:
machiningaccuracyandprocessingmaterials
Metalcuttingprinciplesandcuttingtools(3)
1.Fillintheblanks(2points,20pointsintotal)
1.Thereamingdrillcanbeusedasthefinalmachiningoftheholeorpre-processingbefore(reaming).
2.Differentfromordinaryholeprocessing,themainproblemsofdeepholeprocessingarethree,namely:
cuttingandcuttings,coolingandlubricationand(guidance).
Inmillingmachining,(millingcutterrevolvesarounditsaxis)isthemainmovement.
4.Whenmilling,thecuttingthicknessacistheverticaldistancebetw
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