数控技术专业英语试卷数控10b

密封线兰州工业学院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.reamer12.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.toolholder7.atomic-forcemicroscope8.machinezero9.carbonsteel10.preparatoryfunction11.cutterradiuscompensation12.rakeangle13.endmilling14.wearresistance15.toollife系主任签字：日期：教研室主任签字：日期：姓名班级学号第1页试卷袋号三、TranslatethefollowingsentencesintoChinese(本大题共50分)1.Material-removalprocessesaredesirableorevennecessaryinmanufacturingoperationsforthefollowingreasons:(20分)Closerdimensionalaccuracymayberequiredthanisavailablefromcasting.forming,orshapingprocessesalone.Forexample,intheforgedcrankshaft,thebearingsurfacesandtheholescannotbeproducedwithgooddimensionalaccuracyandsurfacefinishsolelybyformingandshapingprocesses.Partsmayrequireexternalandinternalgeometricfeatures,aswellassharpcornerandflatness,whichcannotbeproducedbyformingandshapingprocesses.Somepartsaresubjectedtovariousheattreatmentsforimprovedhardnessandwearresistance.Sincethesepartsmayundergodistortionandsurfacediscoloration,theygenerallyrequireadditionalfinishingoperations,suchasgrinding,toobtainthedesiredfinaldimensionsandsurfacefinish.Partsmayrequirespecialsurfacecharacteristicsorsurfacetexture:thatcannotbeproducedbyothermeans.Machiningthepartmaybemoreeconomicalthanmanufacturingitbyotherprocesses,particularlyifthenumberofpartsdesiredisrelativelysmall.第2页2.Becausesteelsareamongthemostimportantengineeringmaterials,theirmachinabilityhasbeenstudiedextensively.Carbonsteelshaveawiderangeofmachinability,dependingontheirductilityandhardness.Iftooductile,chipformationcanproducebuilt-upedge,leadingtopoorsurfacefinish;ifthesteelistoohard,itcancauseabrasivewearofthetoolbecauseofthepresenceofcarbidesinthesteel.Cold-workedcarbonsteelsaredesirablefromamachinabilitystandpoint.(10分)3.Turningmeansthatthepartisrotatingwhileitisbeingmachined.Thestartingmaterialisusuallyaworkpiecethathasbeenmadebyotherprocesses,suchascasting,forging,extrusion,ordrawing.Turning,toproducestraight,conical,curved,orgroovedworkpiecesuchasshafts,spindles,andpins.Facing,toproduceaflatsurfaceattheendofthepart,whichisusefulforpartsthatareattachedtoothercomponents,orfacegroovingtoproducegroovesforO-ringseats.(10分)第3页4.Numericalcontrolhasbeenusedinindustryformorethan40years.Simplyput,numericalcontrolisamethodofautomaticallyoperatingamanufacturingmachinebasedonacodeofletters,numbers,andspecialcharacters.Acompletesetofcodedinstructionsforexecutinganoperationiscalledaprogram.Theprogramistranslatedintocorrespondingelectricalsignalsforinputtomotorsthatrunthemachine.Numericalcontrolmachinescanbeprogrammedmanually.Ifacomputerisusedtocreateaprogram,theprocessisknownascomputer-aidedprogramming.(10分)第4页兰州工业学院2012～2013学年第1学期期末考试试卷参考答案及评分标准科目专业英语考试班级数控10-1、2本答案编写人高成秀共1页一、TranslatethefollowingwordsintoChinese(本大题共20小题，每小题1分，共20分)1.齿轮2.轴承3.镗削4.尺寸5.磨削6.钻7.主轴8.表面轮廓仪9.刚度10.锻压11.绞刀12.刀库13.床头箱14.毛刺15编码器16.公差17.传感器18.切槽19.偏置20.螺纹二、TranslatethefollowingphrasesintoChinese(本大题共15小题，每小题2分，共30分)1.热处理2.计算机辅助工艺设计3.间隙配合4.基孔制5.定位公差6.刀柄7.原子力显微镜8.机床原点9.碳钢10.准备功能11.刀具半径补偿12.前角13.立铣14.耐磨性15.刀具耐用度三、TranslatethefollowingsentencesintoChinese(本大题共50分)1.在制造过程中材料去除工艺是必要的，主要有以下原因：(20分)可以获得比铸造、锻造、成型工艺获得的尺寸精度高。例如：锻造机轴，仅仅通过成型加工受力表面和孔不能获得高的尺寸精度和表面精度。零件有内外几何特征、尖角、，这些成型工艺不能够完成一些零件要进行各种热处理来改善硬度和耐磨性。由于这些零件可能经受变形和表面污染，他们需要额外的精加工，比如磨削，以获得预期的尺寸和表面质量。零件需要特定的表面特征和表面形貌：这些其它工艺不能完成。切削加工可能比其它工艺过程经济，尤其零件生产批量小的时候。2.因为钢是最重要的工程材料之一，它的切削加工性得到广泛研究。根据其塑性和硬度，碳钢切削加工性广。如果塑性高容易产生积屑瘤，使表面光洁度差；如果太硬，因为钢中的碳引起刀具磨损。从切削性能讲冷作碳钢是理想材料。(10分)3.车削是加工时零件回转。工件原材料通常由其它工艺制造，如铸造、锻造、挤压成形、拉拔，车削加工直线、锥、曲线或槽，如轴、主轴、钉。平端面在零件端部加工平面，零件装到其它部件上时用到平面，或在端面切O形圈槽。(10分)4.数控在工厂使用已经40多年了。简单讲，数控是基于字母、数字和特定符号代码自动操作制造机器的方法。完成一个操作的完整代码指令叫做程序。程序翻译成相应的电信号输出给电机来驱动机床。数控机床可以手工编程。如果计算机生成程序，这个过程叫做计算机辅助编程。(10分)第1页