
Knife, buckle? Those faults in thread processing, see how the turner technician solves them!
- Categories:Industry news
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- Time of issue:2020-02-13 10:10
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(Summary description)Threadsarecontinuousprotrusionsandgrooveswiththesamecrosssectionformedalongthespirallineontheworkingsurfaceofacylinder.Whenthethreadisactuallyturned,duetovariousreasons,themovementrelationshipbetweenthespindleandthetoolisinacertainrange.Thereareproblemsinthelink,whichcausewasteproductswhenturningthreads,affectingnormalprocessingandproductionandeconomicbenefits. First,thetrowel(trowel)failureanalysis: 原因Thereasonisthattheturningtoolisinstalledtoohighortoolow:theturningtoolisinstalledtoohightoreducetheactualrakeangleofthetool.Whentheknifeiseatentoacertaindepth,theflankoftheturningtoolisagainsttheworkpiece,increasingfriction.Force,eventhetopoftheworkpieceisbent,causingthephenomenonoftrowel;iftheturningtoolisinstalledtoolow,theactualrakeangleofthetoolisincreased,thechipsarenoteasytobedischarged,resultingintrowel. ⑵,theworkpieceorturningtoolisnotclampedfirmly:therigidityoftheworkpieceitselfcannotsupportthecuttingforceduringturning,whichresultsinexcessivedeflection,whichchangesthecenterheightoftheturningtoolandtheworkpiece(theworkpieceislifted),resultinginasuddenincreaseincuttingdepth,Thephenomenonofstabbingappears. (3)Theturningtoolisseverelyworn:theintensifiedfrictioncausesthecuttingforcetoincreaseandcausesthetrowel. ⑷,improperselectionoffeedmethodandfeedamount:whenthelargepitchisprocessed,thetwoedgesofthetoolareinvolvedincuttingatthesametime,andthefeedamountistoolarge,whichwillcausethecuttingforcetocausethecuttingphenomenon. Solution: ⑴Whensettingtheturningtool,usethetipofthetailstocktosettheknifeorusethemeasuringmethodtomakethetooltipandtheaxisoftheworkpieceequal.[Inroughturningandsemi-finishingturning,thepositionofthetooltipis1%higherthanthecenteroftheworkpiece.Disabout0.2~0.5mm,andD=thediameteroftheworkpiece.] 工件Theworkpieceandtoolmustbeclampedfirmly.Thetailstockcenter,centerframe,andtoolholdercanbeusedtoincreasetherigidityoftheworkpiece. (3)Correctandtimelysharpenthegeometricangleparametersofthetool.Asshownbelow: 左右Inthecaseoflarge-pitchmachining,theleft-rightcuttingmethodortheobliqueapproachmethodisused.Theturningtoolisasingle-edgedcuttingmethod,andthecuttingforceandfrictionforcearerelativelyreduced,soitisnoteasytoproduceaburrphenomenon.Inactualwork,aself-madeelastictoolbarisused(asshowninthefigure).Whenthecuttingforceexceedsacertainvalue,theturningtoolcanautomaticallyletthetoolmaintainthecuttingthicknessandeffectivelyavoidthephenomenonofcutting. 2.Randombucklefailureanalysis:Thereasonisthatwhenthescrewrotatesonerevolution,theworkpieceisnotrotatedbytheintegerrevolution. Solution: ⑴Whentheratiobetweenthescrewpitchofthelathescrewandtheworkpiecepitchisnotanintegralmultiple:iftheopeningandclosingnutisusedwhenthetoolisretracted,andthesaddleisshakentothestartingposition,thentheturningoccurswhentheopeningandclosingnutisclosedagainThetipoftheknifeisnotinthespiralgroovethatwascutoutbythepreviousknife,sothatthebuckleappears.Thesolutionistousetheforwardandreverseturningmethodtoretractthetool,thatis,attheendofthefirststroke,withoutliftingtheopeningandclosingnut,afterthetooliswithdrawnintheradialdirection,themainshaftisreversed,andtheturningtoolisretractedinthelongitudinaldirection.Twostrokes,duringthisreciprocatingprocess,duetothetransmissionbetweenthespindle,thescrewandthetoolpost Theturningtoolhasnotbeenseparated,andtheturningtoolisalwaysintheoriginalspiralgroove,sotherewillbenoclutter. 对于Forthethreadoftheturninglathescrewpitchandtheworkpiecepitchratioisanintegralmultiple:theworkpieceandthescrewarerotating,afterliftingtheopeningandclosingnut,atleastoneturnofthescrewmustbeturnedbeforetheclosingnutcanbeclosedagain.Inthisway,whentheleadscrewisrotatedonce,theworkpieceisrotatedbyanintegermultiple,theturningtoolcanenterthespiralgrooveofthepreviousturningtool,andtherewillbenoclutter. 3.Thepitchisincorrect Failureanalysis:Thefulllengthorpartofthethreadisincorrect,thepitchisunevenonthefulllengthofthethread,orthebamboopatternappearsonthethread. Solution: ⑴Thelengthofthethreadisincorrect:thereasonistheimpropermatchingofthehangingwheelorthepositionofthefeedboxhandle.Youcanrecheckthepositionofthefeedboxhandleorcheckthehangingwheel. 局部,partialincorrect:Thereasonisduetothelocalerrorofthescrewpitchofthelathescrewitself(usuallycausedbywear),thescrewcanbereplacedorrepairedlocally. ⑶Theunevenpitchofthethreadovertheentirelengthofthethreadiscausedbytheaxialmovementoftheleadscrew,theaxialmovementofthemainshaft,theopeningandclosingnutoftheslideboxandthedifferentshaftofthescrew,resultinginpoormeshing,thedovetailguideoftheslideboxWearandtearcauseinstabilitywhentheopeningandclosingnutisclosed,andthegapbetweenthehangingwheelsistoolarge.Passthetest:Ifitiscausedbytheaxialmovementofthescrew,theadjustmentroundnutattheconnectionbetweenthelathescrewandthefeedboxcanbeadjustedtoeliminatetheaxialclearanceofthethrustballbearingattheconnection.Ifitiscausedbytheaxialmovementofthemainshaft,themainshaftadjustmentnutcanbeadjustedtoeliminatetheaxialclearanceoftherearthrustballbearing.Iftheopeningandclosingnutoftheslideboxandthescrewleadtodifferentsha
Knife, buckle? Those faults in thread processing, see how the turner technician solves them!
(Summary description)Threadsarecontinuousprotrusionsandgrooveswiththesamecrosssectionformedalongthespirallineontheworkingsurfaceofacylinder.Whenthethreadisactuallyturned,duetovariousreasons,themovementrelationshipbetweenthespindleandthetoolisinacertainrange.Thereareproblemsinthelink,whichcausewasteproductswhenturningthreads,affectingnormalprocessingandproductionandeconomicbenefits. First,thetrowel(trowel)failureanalysis: 原因Thereasonisthattheturningtoolisinstalledtoohighortoolow:theturningtoolisinstalledtoohightoreducetheactualrakeangleofthetool.Whentheknifeiseatentoacertaindepth,theflankoftheturningtoolisagainsttheworkpiece,increasingfriction.Force,eventhetopoftheworkpieceisbent,causingthephenomenonoftrowel;iftheturningtoolisinstalledtoolow,theactualrakeangleofthetoolisincreased,thechipsarenoteasytobedischarged,resultingintrowel. ⑵,theworkpieceorturningtoolisnotclampedfirmly:therigidityoftheworkpieceitselfcannotsupportthecuttingforceduringturning,whichresultsinexcessivedeflection,whichchangesthecenterheightoftheturningtoolandtheworkpiece(theworkpieceislifted),resultinginasuddenincreaseincuttingdepth,Thephenomenonofstabbingappears. (3)Theturningtoolisseverelyworn:theintensifiedfrictioncausesthecuttingforcetoincreaseandcausesthetrowel. ⑷,improperselectionoffeedmethodandfeedamount:whenthelargepitchisprocessed,thetwoedgesofthetoolareinvolvedincuttingatthesametime,andthefeedamountistoolarge,whichwillcausethecuttingforcetocausethecuttingphenomenon. Solution: ⑴Whensettingtheturningtool,usethetipofthetailstocktosettheknifeorusethemeasuringmethodtomakethetooltipandtheaxisoftheworkpieceequal.[Inroughturningandsemi-finishingturning,thepositionofthetooltipis1%higherthanthecenteroftheworkpiece.Disabout0.2~0.5mm,andD=thediameteroftheworkpiece.] 工件Theworkpieceandtoolmustbeclampedfirmly.Thetailstockcenter,centerframe,andtoolholdercanbeusedtoincreasetherigidityoftheworkpiece. (3)Correctandtimelysharpenthegeometricangleparametersofthetool.Asshownbelow: 左右Inthecaseoflarge-pitchmachining,theleft-rightcuttingmethodortheobliqueapproachmethodisused.Theturningtoolisasingle-edgedcuttingmethod,andthecuttingforceandfrictionforcearerelativelyreduced,soitisnoteasytoproduceaburrphenomenon.Inactualwork,aself-madeelastictoolbarisused(asshowninthefigure).Whenthecuttingforceexceedsacertainvalue,theturningtoolcanautomaticallyletthetoolmaintainthecuttingthicknessandeffectivelyavoidthephenomenonofcutting. 2.Randombucklefailureanalysis:Thereasonisthatwhenthescrewrotatesonerevolution,theworkpieceisnotrotatedbytheintegerrevolution. Solution: ⑴Whentheratiobetweenthescrewpitchofthelathescrewandtheworkpiecepitchisnotanintegralmultiple:iftheopeningandclosingnutisusedwhenthetoolisretracted,andthesaddleisshakentothestartingposition,thentheturningoccurswhentheopeningandclosingnutisclosedagainThetipoftheknifeisnotinthespiralgroovethatwascutoutbythepreviousknife,sothatthebuckleappears.Thesolutionistousetheforwardandreverseturningmethodtoretractthetool,thatis,attheendofthefirststroke,withoutliftingtheopeningandclosingnut,afterthetooliswithdrawnintheradialdirection,themainshaftisreversed,andtheturningtoolisretractedinthelongitudinaldirection.Twostrokes,duringthisreciprocatingprocess,duetothetransmissionbetweenthespindle,thescrewandthetoolpost Theturningtoolhasnotbeenseparated,andtheturningtoolisalwaysintheoriginalspiralgroove,sotherewillbenoclutter. 对于Forthethreadoftheturninglathescrewpitchandtheworkpiecepitchratioisanintegralmultiple:theworkpieceandthescrewarerotating,afterliftingtheopeningandclosingnut,atleastoneturnofthescrewmustbeturnedbeforetheclosingnutcanbeclosedagain.Inthisway,whentheleadscrewisrotatedonce,theworkpieceisrotatedbyanintegermultiple,theturningtoolcanenterthespiralgrooveofthepreviousturningtool,andtherewillbenoclutter. 3.Thepitchisincorrect Failureanalysis:Thefulllengthorpartofthethreadisincorrect,thepitchisunevenonthefulllengthofthethread,orthebamboopatternappearsonthethread. Solution: ⑴Thelengthofthethreadisincorrect:thereasonistheimpropermatchingofthehangingwheelorthepositionofthefeedboxhandle.Youcanrecheckthepositionofthefeedboxhandleorcheckthehangingwheel. 局部,partialincorrect:Thereasonisduetothelocalerrorofthescrewpitchofthelathescrewitself(usuallycausedbywear),thescrewcanbereplacedorrepairedlocally. ⑶Theunevenpitchofthethreadovertheentirelengthofthethreadiscausedbytheaxialmovementoftheleadscrew,theaxialmovementofthemainshaft,theopeningandclosingnutoftheslideboxandthedifferentshaftofthescrew,resultinginpoormeshing,thedovetailguideoftheslideboxWearandtearcauseinstabilitywhentheopeningandclosingnutisclosed,andthegapbetweenthehangingwheelsistoolarge.Passthetest:Ifitiscausedbytheaxialmovementofthescrew,theadjustmentroundnutattheconnectionbetweenthelathescrewandthefeedboxcanbeadjustedtoeliminatetheaxialclearanceofthethrustballbearingattheconnection.Ifitiscausedbytheaxialmovementofthemainshaft,themainshaftadjustmentnutcanbeadjustedtoeliminatetheaxialclearanceoftherearthrustballbearing.Iftheopeningandclosingnutoftheslideboxandthescrewleadtodifferentsha
- Categories:Industry news
- Author:
- Origin:
- Time of issue:2020-02-13 10:10
- Views:
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