牛头刨床钻床和铣削(机械系论文外文翻译)

《牛头刨床钻床和铣削(机械系论文外文翻译)》由会员上传分享，免费在线阅读，更多相关内容在工程资料-天天文库。

1、译文题目牛头刨床、钻床和铳削专业机械设计制造及其自动化112学生姓名钱陈历学号11556222Shapers,DrillingandMillingMachinesAshapersutilizesasingle-pointtoolonatoolholdermountedontheendoftheram.Cuttingisgenerallydoneontheforwardstroke.Thetoolisliftedslightlybytheclapperboxtopreventexcessivedragacrossthework,wh

2、ichisfedunderthetoolduringthereturnstrokeinpreparationforthenextcut.Thecolumnhousestheoperatingmechanismsoftheshaperandalsoservesasamountingunitforthework-supportingtable.Thetablecanbemovedintwodirectionsmutuallyperpendiculartotheram.Thetoolslideisusedtocontrolthedept

3、hofcutandismanuallyfed.Itcanberotatedthrough90deg,oneithersideofitsnormalverticalposition,whichallowsfeedingthetoolatanangletothesurfaceofthetable.TwotypesofdrivingmechanismsforshapersareamodifiedWhitworthquick-returnmechanismandahydraulicdrive.FortheWhitworthmechanis

4、m,themotordrivesthebullgear,whichdrivesacrankarmwithanadjustablecrankpintocontrolthelengthofstroke.Asthebullgearrotates,therockerarmisforcedtoreciprocate,impartingthismotiontotheshaperram.Themotoronahydraulicshaperisusedonlytodrivethehydraulicpump.Theremainderofthesha

5、permotionsarecontrolledbythedirectionoftheflowofthehydraulicoil.Thecuttingstrokeofthemechanicallydrivenshaperuses220deg.Ofrotationofthebullgear,whilethereturnstrokeuses140deg.Thisgivesacuttingstroketoreturnstrokeratioof1.6to1.Thevelocitydiagramforahydraulicshapershows

6、thatformostofthetoolduringcuttingstrokeisneverconstant,whilethevelocitydiagramforahydraulicshapershowsthatformostofthecuttingstrokethecuttingspeedisconstant.Thehydraulicshaperhasanaddedadvantageofinfinitelyvariablecuttingspeeds.Theprincipaldisadvantageofthistypeofmach

7、ineisthelackofadefinitelimitattheendoftheramstroke,whichmayallowafewthousandthsofaninchvariationinstrokelength.Aduplicatingdevicethatmakespossiblethereproductionofcontoursfromasheet-metaltemplateisavailable.Thesheetmetaltemplateisusedinconjunctionwithhydrauliccontrol.

8、Uprightdrillingmachinesordrillpressesareavailableinavarietyofsizesandtypes,andareequippedwithasufficientrangeofapindlespeeds