机械类文献翻译刀具的设计.doc

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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