金属材料外文翻译关于硬质合金刀具刀刃磨损的研究文档格式.docx

金属材料外文翻译关于硬质合金刀具刀刃磨损的研究文档格式.docx

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Theboundarynotchofcementedcarbidecuttingtoolsisaweararea,whichisrelativelylarge,resultingfromfrictionbetweenmaincuttingedgeandthesurfaceoftheworkpieceasthefollowingFig.1.Fig.1（a）showsatraditionalwearingtypeoftheflank.TherakefaceArandflankfaceAaarealsoshown.Fig.1（b）showsthemaindimensionofboundarynotchofthelathetool,inwhichVNrepresentedtheheightofboundarynotchandCreferstothewidth.ItisapparentthatthegreaterthedimensionsofVNandCare,thegreateritdestroystheperformanceoftoolsandinfluencesthemachiningquality[3,4].

Byexperiment,theformingprocessoftheboundarynotchcanbedividedintothefollowingthreesteps:

firstly,severalmicrocracksareproducedatmaincuttingedge.Secondly,themeshfracturesarefoundintheboundaryareasandtheywillspread.Finally,thepiecematerialwillbedenudedandtheboundarynotchisformed.Inthesubsequentcuttingprocess,thedimensionoftheboundarybecomesbiggerandbigger.

Fig.2showstheformingprocessofboundarynotchofthecementedcarbidecuttingtools.

Mainfactorstoinfluenceboundarynotcharemechanicalperformanceofthepiecematerial,thecuttermaterial,andgeometryparameterofthecutter.Thefollowingexperimentswerecarriedoutinordertoexpoundtheformingmechanismandevolutionrulesoftheboundarynotch..

Fig.1Boundarynotchofthecementedcarbidecuttingtoolinturning

Fig.2Formingprocessofboundarynotchofthecementedcarbidecuttingtools.

3EXPERIMENTCONDITIONSANDTESTINGMEASURES

ThelatheC6130andreversiblecuttingtoolareusedintheexperiment.Fivecuttermaterialsareemployed.MainmechanicalparametersofcuttermaterialareshowninTable1.

Themachiningpieceisthefriction-weldedlineofthesinglehydraulicpillar.Thewidthoftheweldedlineis15mmandthemachiningallowanceis5.5mm.Besides,theabovepillarisweldedwith270SiMnand45#steel.TherelativelymechanicalperformancesoftheweldedlineareshowninTable2.

BasedonmanufacturingexperienceandrelativeinformationinChinaandothercountriesaboutsimilarmachiningprocess,thechosenmachiningandtoolgeometryparametersareshowninTable3.

Theboundarynotchdimensionsofthecementedcarbidecuttingtools（boundarynotchheightVNandwidthCaredirectlyattainedbytoolmicroscope.Inordertoensurereliabilityoftheresults,repeatedexperimentsarecarriedout.Therecurrentperformanceisgood.

4EXPERIMENTRESULTSANDANALYSIS

4.1CutterMaterials

Fordifferentcuttermaterials,asshowninFig.3,themachiningperformanceandtheabilitytoresistboundarynotcharedistinctlydifferent.

FromFig.3,wecanfindtheboundarynotchdimensionsarerelativelylargewhenYD10,YD15andYWareused.WhereastheboundarynotchdimensionissmallestwhenYTS25isused.Becauseoftheasymmetryallowancesimpactsandvibrationswilltakeplace.YTS25cutterhasbetterimpact-resistingperformanceandboundarynotchdimension.Therefore,YTS25cuttermaterialisselectedtodothefollowingexperiments.

Table1MaterialPerformancesofCutters

Type

MaterialPerformance

Remark

HRA

σb（kg/mm2）

Γ（g/cm2）

YD10

YD15

707

YW2

YTS25

≥92

≥90.5

≥91

≥130

≥125

≥145

≥150

≥200

12.4~112.8

11.5~12.1

11.8~12.5

12.7~1.3.3

12.8~13.2

Northtools

ZiGong

Zhugong

Zhuzhou

Table2MechanicalPerformancesofCutters

Item

Tensilestrength

Elongationrate

Shrinkagerate

Impacttoughness

σb

（kg/mm2）

δ

（%）

T

Αk

（kg/cm2）

270SiMn

100

12

40

5

45#

61

16

WeldingLine

64.6~82

5.5~13

37.6~46.2

3.5~6.4

Table3CuttingParameters

CuttingvelocityV（m/min）

75

Cuttingdepthαp（mm）

5.5

Feedratef（mm/r）

0.3

Rakeangleγ0（□

10

Clearanceangleα0（□

8

CuttingedgeangleKr（□

845;

75;

90

Edgeinclinationλs（□

-5

Negativechamferbα1（mm）

0.1;

0.2;

0.3

Cuttercornerradiusrε（mm）

0.2;

0.4;

0.8

4.2InfluencesofCuttingEdgeAngle

TheresultsofthevarietyboundarynotchareshownasinFig.4whenthecuttingedgeangleischanged.FromFig.4wecanfindthat,withthelesseningofthecuttingedgeangleKr,thedimensionsoftheboundarynotchdecrease.ThereasonisthatwiththelesseningofthecuttingedgeangleKr,thelengthofthecuttingedgethatactsoncuttingbecomeslargerandtheaverageloadsonthecuttingedgebecomelighter.

4.3InfluencesofCutterCornerRadiusrε

TheresultsofthevarietyboundarynotchwiththecuttercornerchangingareshownasFig.5.Theboundarynotchdimensiondecreaseswiththecuttercornerradiusrεbecominglesser.Thereasonisthatwiththeincreasingofthecuttercornerradius,theimpact-resistanceperformance.

Fig.3Differentboundarynotchresultstodifferentuttermaterial

Fig.4InfluencesofcuttingedgeangleKr

increasesandthevolumeofthecutterthatenduresheatbecomeslarger.Therefore,underthesamecuttingconditions,boundarynotchdimensions（VN,C）decreasewhenthecuttercornerradiusbecomeslesser.

4.4InfluencesofNegativeChamferbαl

TheexperimentresultsofthevarietyboundarynotchareshownasinFig.6whenthewidthofthenegativechamferischanged.Thedimensionoftheboundarynotchwilldecreasewhenthewidthofthenegativechamferbαldecreases.Therefore,inordertoresistordecreasethecutterboundarynotch,thelessernegativechamferbαlshouldbechosen.

4.5DeburringMachiningProcess

Theburrshavesomeinfluencesoncutterboundarynotchinmetalmachiningprocess.Adeburringcutterischosentodecreasetheadverseinfluenceoncutter.AdifferentresultbetweendeburringmachiningprocessandcommonmachiningprocessisshownasinFig.7.Itcanbeseenthatabout75%oftheboundarynotchisdecreased.So,burrisamainfactortoproduceandincreasetheboundarynotchofthecutter.

Fig.5InfluenceofcuttercornerradiusR

Fig.6Influencesofnegativechamferwidth

Fig.7Deburringmachiningprocessandcommonmachiningprocess

5CONCLUSIONS

Fromaboveexperimentalresearchandtheoreticalanalysis,thefollowingconclusionsareattained:

1）BoundarynotchofthecuttingtoolcanbeexpressedbyboundarynotchheightVNandboundarynotchwidthC.Theformingprocessesofboundarynotchcanbedividedintothreesteps:

micro-tippingappearsfirstly;

Then,meshfracturesexpand;

Finally,boundarynotchresults.

（2）Mainfactorsthatinfluenceboundarynotchofcementedcarbidecutterarepiecematerial,cuttermaterialandcuttergeometryparameters.

（3）Deburringmachiningprocessandadjustingcuttingtoolgeometryparameters（toreduceedgeangleKrandwidthofnegativechamferbαl,toincreasecuttercornerradiusrε）canbechosentodecreaseeffectivelyboundarynotch,whichensuresthequalityofworkpieceandcuttingperformancesofcuttingtool.

ACKNOWLEDGEMENTS

TheauthorsaregratefultoNaturalScienceFoundationofP.R.C.forsupportofthisproject（GrantNo.59775071and50275066）.

REFERENCES

[1]WANGGuicheng.InnerStressintheSurfaceofBrazedCementedCarbideCuttingTool.CementedCarbide.1989,6（4）:

p.169~172（inChinese）

[2]WANGGuicheng.CuttingPerformancesofBrazedCementedCarbideCuttingTool.CementedCarbide.1993,10

（1）:

p.69~72（inChinese）

[3]ZHOUZehua.ThePrinciplesofMetalCutting.Shanghai:

ShanghaiScienceandTechnologyPress,1985（inChinese）

[4]ZHANGYouzhen.MetalCuttingTheory.Beijing:

AviationIndustryPress,998（inChinese）

关于硬质合金刀具刀刃磨损的研究

摘要硬质合金刀具的性能直接影响到工件的切削质量。

在这篇文章里，研究了刀具磨损的形成机制，分析相关理论，提出了刀具磨损尺寸的定义，并且指出了刀具磨损的主要因素。

除硬质合金刀具的形成过程和变动位置以外发现,并且一定数量的措施减少和控制硬质合金刀具被推进了。

关键词刀刃磨损；

硬质合金刀