车床英语PPT课件

.,1,机制专业英语,太原科技大学文豪（教授）,机制专业英语,TechnicalEnglishformechanicalengineering,河南机电高等专科学校-机械工程系,.,2,1,LessonFifteenLathe,一、newwords,lathelein.车床headstockhedstkn.主轴箱，床头箱tailstockn.尾架，尾座bedbedn.（机床）床身tool-posttu:lpustn.刀架，刀座,.,3,cross-slidekrs-slidn.横向滑板，中拖板sidewardsaidw:dzad.侧面地，向旁边地saddlesdln.大拖板，床鞍carriage5kAridVn.（机床）溜板，拖板centersentn.顶尖turrettritn.转塔,.,4,incorporateink:preitv.包括，合并mattermtv.要紧，有重大关系taperedteipda.锥形的nosenuzn.端部，管口feedfi:dn.进给leverli:vn.杠杆，手柄，把柄jawn.卡爪，虎钳牙.,.,5,chucktkn.卡盘，夹具v.用（卡盘）夹紧leadscrewli:dskru:n.丝杠，螺杆threadredn.螺纹pitchpitn.螺距，间距turretlathe转塔车床，六角车床transversemovement横向运动,.,6,reversinglever反向柄feed-shaft光杠livecenter主轴顶尖，活动顶尖deadcenter尾架顶尖，固定顶尖three-jawuniversalchuck三爪万能卡盘four-jawindependentchuck四爪卡盘,.,7,Havearestplease!,.,8,知之者不如好之者,好之者不如乐之者,孔子,.,9,Thelatheisoneofthemostusefulandversatilemachinesintheworkshop,andiscapableofcarryingoutawidevarietyofmachiningoperations.Themaincomponentsofthelathearetheheadstockandtailstockatoppositeendsofabed,andatool-postbetweenthemwhichholdsthecuttingtool.Thetool-poststandsonacross-slidewhichenablesittomovesidewardacrossthesaddleorcarriageaswellasalongit,dependingonthekindofjobitisdoing.,二、Text,.,10,二、Text,Theordinarycenterlathecanaccommodateonlyonetoolatatimeonthetool-post,butaturretlatheiscapableofholdingfiveormoretoolsontherevolvingturret.Thelathebedmustbeverysolidtopreventthemachinefrombendingortwistingunderstress.Theheadstockincorporatesthedrivingandgearmechanism,andaspindlewhichholdstheworkpieceandcausesittorotateataspeedwhichdependslargelyonthediameteroftheworkpiece.Abaroflargediametershouldnaturallyrotatemoreslowlythanaverythinbar,thecuttingspeedofthetooliswhatmatters.,.,11,二、Text,Taperedcentersinthehollownoseofthespindleandofthetailstockholdtheworkfirmlybetweenthem.Afeed-shaftfromtheheadstockdrivesthetool-postalongthesaddle,eitherforwardsorbackwards,atafixedanduniformspeed.Thisenablestheoperatortomakeaccuratecutsandtogivetheworkagoodfinish.Gearsbetweenthespindleandthefeed-shaftcontrolthespeedofrotationoftheshaft,andthereforetheforwardorbackwardmovementofthetool-post.Thegearwhichtheoperatorwillselectdependsonthetypeofmetalwhichheiscuttingandtheamountofmetalhehastocutoff.,.,12,二、Text,Centersarenotsuitableforeveryjobonthelathe.Theoperatorcanreplacethembyvarioustypesofchucks,whichholdtheworkbetweenjaws,orbyafront-plate,dependingontheshapeofworkandtheparticularcuttingoperation.Hewilluseachuck,forexample,toholdashortpieceofwork,orworkfordrilling,boringorscrew-cutting.Atransversemovementofthetool-postacrossthesaddleenablesthetooltocutacrossthefaceoftheworkpieceandgiveitaflatsurface.Forscrew-cutting,theoperatorengagesthelead-screw,alongscrewedshaftwhichrunsalonginfrontofthebedandwhichrotateswiththespindle.,.,13,二、Text,Thelead-screwdrivesthetool-postforwardsalongthecarriageatthecorrectspeed,andthisensuresthatthethreadsonthescrewareofexactlytherightpitch.Theoperatorcanselectdifferentgearspeeds,andthiswillaltertheratioofspindleandlead-screwspeedsandthereforealterthepitch