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ID:46854213
大小:60.00 KB
页数:8页
时间:2019-11-28
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1、英文原文GearmanufacturingmethodsTherearetwobasicmethodsofmanufacturinggearteeth:thegeneratingprocessandtheformingprocess,whenageartoothisgenerated,theworkpieceandthecuttingorgrindingtoolareincontinuousmeshandthetoothformisgeneratedbythetool.Inotherwords,theworkandthetoolareconjugatedtoeachother,hob
2、bing:machines,shapercutters,shavingmachines,andgrindersusethisprinciple.Whenageartoothisformed,thetoolisintheshapeofthespacethatisbeingmachinedout.Somegrindingmachinesusethisprinciplewithanindexingmechianismwhichallowsthegearteethtobeformedtoothbytooth.Broachesareexamplesofformtoolsthatmachinea
3、llthegearteethsimultaneously.shapingShapingisinherentlysimilartoplanningbutusesacircularcuttrerinsteadofrackandtheresultingreductioninthereciprocatinginertiaallowsmuchhigherstrokingspeeds:modernshaperscuttingcargearscanrunat2,000cuttingstrokesperminmute.Theshapeofthecutterisroughlythesameasanin
4、volutegearbutthetipsoftheteetharerounded.Thegeneratingdrivebetweencutterandworkpiecedoesnotinvolvearackorleadscrewsinceonlycircularmotionininvolved・Thetoolandworkpiecemovetangentialtypically0.5mmforeachstrokeofthecutte匚Onthereturnstrokethecuttermustberetractedabout1mmtogiveclearanceotherwisetoo
5、lmboccursonthebackstrokeandfailureisrapid.Thespeedonthistypeofmachineislimitedbytherateatwhichsome50kgofcutterandbearingscanbemovedadistanceof1mm.theaccelerationsinvolvedtequireforcesoftheorderof5000Nyethighaccuracymustbemaintained.arethatproductionratesarerelativelyhighandthatitispossibletocut
6、rightuptoashoulder.Unfortunately,forhelicalgears,ahelicalguideisrequiredtoimposearotationalmotiononthestrokingmotion;suchhelicalguidescannotbeproducedeasilyorcheaplysothemethodisonlysuitableforlongrunswithhelicalgearssincespecialcuttersandguidesmustbemanufacturedforeachdifferenthelixangle.Agrea
7、tadvantageofshapingisitsabilitytoannulargearssuchasthoserequiredforlargeepicyclicdrives.Whenveryhighaccuracyisofimportancetheinaccuraciesintheshapingcuttermattersincetheymaytransfertothecutgear.Itisobviousthatprofileerrorswilltran
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