牛头刨床、钻床和铣削机床夹具外文文献翻译、中英文翻译、外文翻译.pdfVIP

中国地质大学长城学院

本科毕业设计外文资料翻译

系别：工程技术系

专业：机械设计制造及其自动化

*名：***

学号：********

2015年4月1日

Shapers,DrillingandMillingMachines

Ashapersutilizesasingle-pointtoolonatoolholdermountedontheendofthe

ram.Cuttingisgenerallydoneontheforwardstroke.Thetoolisliftedslightlybythe

clapperboxtopreventexcessivedragacrossthework,whichisfedunderthetool

duringthereturnstrokeinpreparationforthenextcut.Thecolumnhousesthe

operatingmechanismsoftheshaperandalsoservesasamountingunitforthe

work-supportingtable.Thetablecanbemovedintwodirectionsmutually

perpendiculartotheram.Thetoolslideisusedtocontrolthedepthofcutandis

manuallyfed.Itcanberotatedthrough90deg,oneithersideofitsnormalvertical

position,whichallowsfeedingthetoolatanangletothesurfaceofthetable.

TwotypesofdrivingmechanismsforshapersareamodifiedWhitworth

quick-returnmechanismandahydraulicdrive.FortheWhitworthmechanism,the

motordrivesthebullgear,whichdrivesacrankarmwithanadjustablecrankpinto

controlthelengthofstroke.Asthebullgearrotates,therockerarmisforcedto

reciprocate,impartingthismotiontotheshaperram.

Themotoronahydraulicshaperisusedonlytodrivethehydraulicpump.The

remainderoftheshapermotionsarecontrolledbythedirectionoftheflowofthe

hydraulicoil.Thecuttingstrokeofthemechanicallydrivenshaperuses220deg.Of

rotationofthebullgear,whilethereturnstrokeuses140deg.Thisgivesacutting

stroketoreturnstrokeratioof