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时间:2021-01-19
《机械类文献翻译刀具的设计.doc》由会员上传分享,免费在线阅读,更多相关内容在应用文档-天天文库。
1、CuttingtooldesignName:zhengxianzheStudentID:7Class:Mechanical08-1ClassPhysicsofmetal-cuttingprovidethetheoreticalframeworkbywhichwemustexamineallotherelementsofcuttingtooldesign.Wehaveworkpiecematerialsfromaverysoft,butteryconsistencytoveryhardandshearresistant
2、.Eachoftheworkpiecematerialsmustbehandledbyitself;theamountofbroadinformationthatisapplicabletoeachworkpiecematerialisreducedasthedistinctionsbetweenworkpiececharacteristicsincrease.Notonlyisthereavastdiversityofworkpiecematerials,butthereisalsoavarietyofshapes
3、oftoolsandtoolcompositions.Thetooldesignermustmatchthemanyvariablestoprovidethebestpossiblecuttinggeometry.Therewasadaywhentrialanderrorwasnormalforthisdecision,buttoday,withtheever-increasingvarietyoftools,trialanderrorisfartooexpensive.Thedesignermustdevelope
4、xpertiseinapplyingdateandmakingcomparisonsonthebasisoftheexperienceofothers.Forexample:toolmanufacturesandmaterialsalesmenwillhavefigurestheircompanieshavedeveloped.Thefiguresaremeanttobeguidelines;however,acarefulexaminationoftheliteratureavailablewillprovidea
5、nexcellentplacefromwhichtostart,andbemustcheaperthantrialanderror.Materialremovalbymachininginvolvesinteractionoffiveelements:thecuttingtool,thetoolholdingandguidingdevice,theworkholder,theworkpiece,andthemachine.Thecuttingtoolmayhaveasinglecuttingedgeormayhave
6、manycuttingedges.Itmaybedesignedforlinearorrotarymotion.Thegeometryofthecuttingtooldependsuponitsintendedfunction.Thetoolholdingdevicemayormaynotbeusedforguidingorlocating.Toolholderselectionisgovernedbytooldesignandintendedfunction.Thephysicalcompositionofthew
7、orkpiecegreatlyinfluencestheselectionofthemachiningmethod,thetoolcompositionandgeometry,therateofmaterialremoval.Theintendedshapeoftheworkpieceinfluencestheselectionofthemachiningmethodandthechoiceoflinearorrotarytooltravel.Thecompositionandgeometryoftheworkpie
8、cetoagreatextentdeterminestheworkholderrequirements.Workholderselectionalsodependsuponforcesproducedbythetoolontheworkpiece.Toolguidancemaybeincorporatedintotheworkholdingfu
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