机械英语Unit Machine Parts.pptVIP

Unit 2 Machine Parts Fasteners Vocabulary fastener 联接件 nail 钉子 screw 螺钉 nut 螺帽 bolt 螺栓 locknut 锁紧螺帽 washer 垫圈 retaining ring 挡圈 rivet 铆钉 adhesive 粘合剂 rivnut 铆钉 lock washer 锁紧垫圈 locknut 锁紧螺帽 metal stitching 金属钉合 creep in the bolt 螺栓内部蠕动 loss of resilience 弹性丧失 thermal expansion 热膨胀 wear 磨损 axial load 轴向载荷 vibration force 振动力 slotted nut 开槽螺帽 cotter pin 开口销 diameter 直径 clearance 间隙 self-locking nut 自锁螺帽 thread 螺纹 pitch diameter 中径 clamp 夹钳 frictional force 摩擦力 nonmetallic-insert type 非金属嵌入型 elastic locking medium 弹性锁紧介质 bolt loading 螺栓载荷 seal 密封 moisture 湿气 self-tapping screw 自攻丝螺钉 drive screw 传动螺杆 casting 铸件 lead hole 导孔 cutting thread 切削螺纹 forming thread 成形螺纹 holding power 保持力 self-piercing screw 自开孔螺丝 machine screw 机用螺钉 setscrews 止动螺钉 cap screws 铆螺钉 shaft 轴长 shank 杆 deformation 变形 thread-type fastener 螺纹型联接件 aluminum 铝 bucking bar 铆钉顶棒 hydraulic pressure 液压 pneumatic pressure 气动压力 riveting machine 铆接机 improperly formed 成形不当 stress 应力 solid rivet 实心铆钉 tubular / hollow rivet 管形/空心铆钉 semitubular rivet 半管形铆钉 swaged rivet 挤压铆钉 split rivet 开口铆钉 blind rivet 埋头铆钉 Monel metal 蒙乃尔合金 brass 铜 corrosion 腐蚀 anodic coating 阳极化镀层 brazier head 扁头 streamlined pieces 流线型工件 Classification: The commonest means of joining materials: Types: nuts, bolts, screws Advantage: attain maximum effectiveness at the lowest possible cost an ordinary nut loosens: vibration friction nut + lock washer 1. supplies an independent locking feature preventing the nut from loosening 2. is useful only when the bolt might loosen because of a relative change between the length of the bolt and the parts assembled by it The factors cause the relative change between the length: 1. creep in the bolts 2. loss of resilience 3. difference in thermal expansion between the bolt and the bolted members 4. wear Slotted nut + cotter pin diameter: pin the hole in the bolt pin the slot in the nut vibration: can make the nut back off until the clearances are reduced and