1 / 15

Cutting tool_0_removed

Lip angle: Angle between the top face and the flank of the tool.It is also known as angle of keenness. Strength of cutting edge or point of the tool is directly affected by this angle.Larger thel lip angle stronger will be the cutting edge and vise versa.<br>Lip angle varies inversely as the rake angle.<br>Back rake angle: There is also known as Top rack angle. It is the angle between face of tool and a plane parallel to base of tool. The inclination is given from nose along with length of tool and towards the shank. The angle may be positive or negative .<br>side rake angle: The angle between face of

satya51
Download Presentation

Cutting tool_0_removed

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Cuttingtools

  2. Cuttingtool • Itisanytoolthatisusedtoremovematerialfrom theworkpiecebymeansofsheardeformation. • Itfrequentlyreferstoasatoolbit. • Theymustbemadeofamaterialharderthanthe materialwhichistobecut,andthetoolmustbe abletowithstandtheheatgeneratedinthemetal cuttingprocess.

  3. Differenttypesofcuttingtools Accordingtothenumberofcuttingedgethecutting toolsbroadlyclassifiedinto Singlepointcuttingtool Multipointcuttingtool

  4. Singlepointcuttingtool • Thistypeoftoolshasonlyonecuttingedgetoremoveexcess materialfromtheworkpiece.Theymaybeleft/righthanded accordingtothesideofcuttingedgewhenviewingfromtheend point. • Example:toolsusedinlathes,planers,shapersandboringmachines • Multi-pointcuttingtool • .Theyhavemorethanonecuttingedgetoremoveexcess material.Itconsideredasaseriesofsinglepointcuttingedgeonthe peripheryandduringoperationeachcuttingedgeindependently cuttheworkpiece. • Example:Millingcutters,grindingwheels,drills,reamer,broaches

  5. Typesofcuttingtool • Accordingtotheconstructionofcuttingtool: • Solid typetools: Groundtypeandforgedtypetools • Groundtype-Cuttingedgeisformedbygrindingtheendoftool • Forgedtype–Roughforgingisusedbeforehardeningandgrinding toformacuttingedge. • Tippedtypetools:Tippedtypeandinserttype • Tippedtype–High-gradematerialtoolsareusuallyprovidedbythis method.Thecuttingedgeisformedintheformofthesmalltip,whichis brazedtotheshankoflowergradematerial. • Insertorbittype-Atoolbitofhigh-gradematerialisformedinthe formofpolygonalshape,andthenitismechanicallyheldbythecutting toolholder.Insertscannotreshape,soitisdiscardedwhenallcutting edgeswearout.Thennewbitsareinsertedintothetoolholder.

  6. Tippedtypecuttingtool • Insertorbittypecuttingtool

  7. Typesofcuttingtool • Accordingtothequalityofmachiningoperation • Roughingtools:Thistypeoftoolsused forremovingalargeamountof materialintheformofathicklayerofchips. • ii)SurfaceFinishingtools:Thistypeoftoolsusedformetalremovalinthe formofasmallsectionofthechipwithhighcuttingspeedtoachievegood finishing. • Withhelpof singlebroachingtool,roughing&surfacefinishingboth operationcanbedone

  8. Typesofcuttingtool • Accordingtothemotionofcuttingtool • Linearmotiontools: • Lathetools,Boringtools,Broachingtools,Planingtools,Shapingtools,etc. • Rotarymotiontools: • .Millingcutters,Grindingwheels,etc. • LinearandRotarytools: Drills,Honingtools,etc.

  9. Geometryofcuttingtool • Shank:Mainbodyoftool,itispartoftoolwhichisgrippedintoolholder • Face:Topsurfaceoftoolb/wshank andpointoftool.Chipsflowalong thissurface. • Point:Wedgeshapedportionwherefaceandflankof toolmeet. • Heel:Itistheintersectionoftheflankandthebaseof thetool

  10. Flank:Portiontoolwhichfacesthework.Itis surfaceadjacenttobelowthecuttingedgewhen toolliesinahorizontalposition. • Base :Itistheportionoftheflankthatliesoppositetothe topfaceoftheshank • Nose:The intersectionpointofmajorcuttingedgeand minorcuttingedgeiscalledNose. • Cuttingedge: Theedgeonthetoolwhichremoves materialsfromtheworkpieceiscalledcuttingedges.It liesonthefaceofthetool. • endcuttingedge • sidecuttingedge

  11. SinglepointcuttingtoolAngles

  12. Lipangle:Anglebetweenthetopfaceandtheflankofthe tool.Itisalsoknownasangleofkeenness.Strength ofcutting edgeorpointofthetoolisdirectlyaffectedbythisangle.Larger thellipanglestrongerwillbethecuttingedgeandviseversa. • Lipanglevariesinverselyastherakeangle. • Backrakeangle:ThereisalsoknownasToprackangle.Itis theanglebetweenfaceoftoolandaplaneparalleltobaseof tool.Theinclinationisgivenfromnosealongwithlengthoftool andtowardstheshank.Theanglemaybe positiveornegative. • siderake angle:Theanglebetweenfaceoftoolandline perpendiculartoflankoftool. The slopeisgiventheface(or) tooltopposition.Theinclinationisgiventowardsthesideofthe tool.

  13. Positiverakeangle: • Thepositiverakeangletoolhassharpcutting edgeandthecuttingforcerequiredisless in positiverakeangletool.So,thepower requirementduringmachiningisalsoless.This typeoftoolusedinmachiningofsoft material.Positiverakeanglealsohelpin achievingbettermachinability. • Zerorakeangle • Zerorankeangleisintermittentofpositiveand negativerakeangle.Itprovideadvantage anddisadvantagesofbothtosomeextent. • Zero rakeangleisveryeasytodesignand calculationforestimatingmachiningforceis veryeasyinzerorakeangle.

  14. NegativerakeAngle • Usedformachininghardmaterial. • Highcuttingforcerequiredinmachining. • Usedforheavyandinterruptedcuts • Largerlipangle,hensestrongertool. • Effectsofsiderakeangle:- • Duringthemachiningoperationthechipcurlingor amountofchipbendsdependsuponthesiderakeangle. Ifthesiderakeangleislarger,cutandbendingofchip andpowerrequirementwillbedecreased.Hencethat providingbettersurfacefinishofmachiningsurface.

  15. Sidereliefangle:Itistheanglethatpreventstheinterference asthetoolentersthematerial.Itistheanglebetweenthe portionofthesideflankimmediatelybelowthesideedge andalineperpendiculartothebaseofthetoolmeasuredat rightanglestotheside.Itisincorporatedonthetoolto providereliefbetweenitsflankandthework piecesurface. • Sometimeextrasideclearanceisalsoprovidedonthetool thatisalsoknownassideclearanceangle.Itisthesecondary angledirectlybelowtheside reliefangle. • Endrelief angle:Itistheanglethatallowsthetooltocut withoutrubbingonthework-piece.Itisdefinedastheangle betweentheportionoftheendflankimmediatelybelowthe cuttingedgeandalineperpendiculartothebaseofthetool, measuredatrightanglestotheflank.Sometimeextraend clearanceisalsoprovidedonthetoolthatisalsoknownas endclearanceangle.Itisthesecondaryangledirectlybelow theendreliefangle.

More Related