机械英语Unit-2-Machine-PartsVIP免费

Unit2MachinePartsFastenersVocabularyfastener联接件nail钉子screw螺钉nut螺帽bolt螺栓locknut锁紧螺帽washer垫圈retainingring挡圈rivet铆钉adhesive粘合剂rivnut铆钉lockwasher锁紧垫圈locknut锁紧螺帽metalstitching金属钉合creepinthebolt螺栓内部蠕动lossofresilience弹性丧失thermalexpansion热膨胀wear磨损axialload轴向载荷vibrationforce振动力slottednut开槽螺帽cotterpin开口销diameter直径clearance间隙self-lockingnut自锁螺帽thread螺纹pitchdiameter中径clamp夹钳frictionalforce摩擦力nonmetallic-inserttype非金属嵌入型elasticlockingmedium弹性锁紧介质boltloading螺栓载荷seal密封moisture湿气self-tappingscrew自攻丝螺钉drivescrew传动螺杆casting铸件leadhole导孔cuttingthread切削螺纹formingthread成形螺纹holdingpower保持力self-piercingscrew自开孔螺丝machinescrew机用螺钉setscrews止动螺钉capscrews铆螺钉shaft轴长shank杆deformation变形thread-typefastener螺纹型联接件aluminum铝buckingbar铆钉顶棒hydraulicpressure液压pneumaticpressure气动压力rivetingmachine铆接机improperlyformed成形不当stress应力solidrivet实心铆钉tubular/hollowrivet管形/空心铆钉semitubularrivet半管形铆钉swagedrivet挤压铆钉splitrivet开口铆钉blindrivet埋头铆钉Monelmetal蒙乃尔合金brass铜corrosion腐蚀anodiccoating阳极化镀层brazierhead扁头streamlinedpieces流线型工件Classification:FastenersTraditional:nuts,bolts,washersNew:rivnuts,retainingringsFastenersTemporary:nuts,boltsetc.Permanent:rivets,adhesivesetc.Thecommonestmeansofjoiningmaterials:Types:nuts,bolts,screwsAdvantage:attainmaximumeffectivenessatthelowestpossiblecostanordinarynutloosens:vibration>frictionnut+lockwasher1.suppliesanindependentlockingfeaturepreventingthenutfromloosening2.isusefulonlywhentheboltmightloosenbecauseofarelativechangebetweenthelengthoftheboltandthepartsassembledbyitThefactorscausetherelativechangebetweenthelength:1.creepinthebolts2.lossofresilience3.differenceinthermalexpansionbetweentheboltandtheboltedmembers4.wearSlottednut+cotterpindiameter:pin