数控技术专业英语试卷数控10b

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1、教研室主任签字：日期：系主任签字：日期：试卷袋号兰州工业学院2012～2013学年第1学期期末考试试卷科目专业英语考试班级数控10-1，2考试日期10月25日本试卷共4页题目一二三四五六七八九十十一总分分数一、TranslatethefollowingwordsintoChinese(本大题共20小题，每小题1分，共20分)1.gear2.bear3.boring4.dimension5.grinding6.drill7.spindle8.profilometer9.stiffness10.forging11.reamer1

2、2.magazine13.headstock14.burr15.encoder16.allowance17.tranducer18.grooving19.offset20.thread二、TranslatethefollowingphrasesintoChinese(本大题共15小题，每小题2分，共30分)1.heattreatment2.computeraidedprocessplanning3.clearancefit4.hole-basissystem5.positionaltolerancing6.toolholde

3、r7.atomic-forcemicroscope8.machinezero9.carbonsteel10.preparatoryfunction11.cutterradiuscompensation12.rakeangle13.endmilling14.wearresistance15.toollife密封线姓名班级学号第1页三、TranslatethefollowingsentencesintoChinese(本大题共50分)1.Material-removalprocessesaredesirableorevennec

4、essaryinmanufacturingoperationsforthefollowingreasons:(20分)lCloserdimensionalaccuracymayberequiredthanisavailablefromcasting.forming,orshapingprocessesalone.Forexample,intheforgedcrankshaft,thebearingsurfacesandtheholescannotbeproducedwithgooddimensionalaccuracyand

5、surfacefinishsolelybyformingandshapingprocesses.lPartsmayrequireexternalandinternalgeometricfeatures,aswellassharpcornerandflatness,whichcannotbeproducedbyformingandshapingprocesses.lSomepartsaresubjectedtovariousheattreatmentsforimprovedhardnessandwearresistance.S

6、incethesepartsmayundergodistortionandsurfacediscoloration,theygenerallyrequireadditionalfinishingoperations,suchasgrinding,toobtainthedesiredfinaldimensionsandsurfacefinish.lPartsmayrequirespecialsurfacecharacteristicsorsurfacetexture:thatcannotbeproducedbyothermea

7、ns.lMachiningthepartmaybemoreeconomicalthanmanufacturingitbyotherprocesses,particularlyifthenumberofpartsdesiredisrelativelysmall.第2页2.Becausesteelsareamongthemostimportantengineeringmaterials,theirmachinabilityhasbeenstudiedextensively.Carbonsteelshaveawiderangeof

8、machinability,dependingontheirductilityandhardness.Iftooductile,chipformationcanproducebuilt-upedge,leadingtopoorsurfacefinish;ifthesteelistoohar