机电专业英语 中级 谭雪松 杨财荣 unit 3.ppt

UNITTHREEMetal-CuttingProcessChipFormationText1CuttingSpeed,FeedandDepthofCutText2SurfaceQualityText3Grammars(语法)Text4TEXT1ChipFormationNewWordsandPhrases(生词和短语)Notes(课文注释)ReadingMaterials(阅读材料)NewWordsandPhrases(生词和短语)cutting[5kQtiN] [7intEr5AkFEn] [5wɜ:kpi:s] [si5lekt] ,选择rigidity[ri5dViditi:] ,硬度fluid[5flu:id] [klAmp] ,夹紧assume[E5sju:m] ,假设appearance[E5piErEns] ,外表indicate[5indikeit] ,显示geometry[dVi5Cmitri] 几何学differentiate[7difE5renFieit] ,区分discontinuous[5diskEn5tinjuEs] [seg5mentEl] ,断节的represent[7repri5zent] ,象征shear[FiE] ,剪切strain[strein] ,张力exceed[ik5si:d] ,胜过fracture[5frAktFE,5frAktFE(r)] ,骨折ductile[5dQktEl,-7tail] ,柔软的rake[reik] [5ANgl] ,角落friction[5frikFEn] ,摩擦力curl[[kE:l] [5graindiN] 磨,碾recess[ri5ses] [5breiziN] 焊接screwing螺栓连接Notes(课文注释)[1]Thisinteractionisinfluencedbytheselectedcuttingconditions(cuttingspeed,feed,anddepthofcut),cuttingfluids,theclampingofthetoolandworkpiece,:影响这个相互作用过程的主要因素包括:选定的切削条件(切削速度、进给量和切削深度)、使用的切削液、***和工件的装夹方式以及机床的刚度。[2]Thistypeofchip,inthiscase,whichrepresentsthecuttingofmostbrittlematerialssuchascastironandcastbrass,:这类切屑在加工某些脆性材料时产生,例如,铸铁以及铸造黄铜,切削刃作用在切削上的切削力促使其断裂。[3]Continuousandlongchipsmaybedifficulttohandleand,consequently,thetoolmustbeprovidedwithachipbreaker,:长而连续的切屑在生产过程中往往难以处理,因此,***上必须具有断屑器,用来将切屑卷起来并断为小段。ReadingMaterials(阅读材料)MotionsofMetalCutting(金属切削加工时的运动)Theunwantedmaterialinmetal-cuttingprocessesisremovedbyarigidcuttingtool,sothatthedesiredgeometry,tolerances(公差),,drilling,reaming,milling,shaping,planing,broaching,grinding,honing,,多余的材料由刚性***切除,以获得需要的几何形状、公差和表面粗糙度。属于此类加工方法的例子有车削、钻削、铰削、铣削、牛头刨削、龙门刨削、拉削、磨削、珩磨和研磨。Mostofthecuttingormachiningpr