目 录

摘 要 ............................................................................................................................................... Ⅰ Abstract ........................................................................................................................................... Ⅱ

1 绪论 ................................................................................................................................................. 1

1.1课题背景 ............................................................................................................................... 1

1.2夹具的发展史 ....................................................................................................................... 1 1.3小结 ....................................................................................................................................... 2

2 拨叉80-08的加工工艺规程设计 .......................................................................................... 3

2.1零件的分析 ........................................................................................................................... 3

2.1.1零件的作用 .................................................................................................................. 3 2.1.2零件的工艺分析 .......................................................................................................... 3 2.2确定生产类型 ....................................................................................................................... 3 2.3确定毛坯 ............................................................................................................................... 3

2.3.1确定毛坯种类 .............................................................................................................. 3 2.3.2确定铸件加工余量及形状 .......................................................................................... 3 2.3.3绘制铸件零件图 .......................................................................................................... 4 2.4工艺规程设计 ....................................................................................................................... 4

2.4.1选择定位基准 .............................................................................................................. 4 2.4.2制定工艺路线 .............................................................................................................. 4 2.4.3选择加工设备和工艺设备 .......................................................................................... 6 2.4.4机械加工余量、工序尺寸及公差的确定 .................................................................. 6 2.5确定切削用量及基本工时 ................................................................................................... 8

2.5.1工序1：粗铣Φ25H7的两侧面 ................................................................................. 8 2.5.2工序2：粗铣平下端面孔侧面的工艺凸台 ............................................................... 9 2.5.3工序3：钻Φ25H7的通孔 ......................................................................................... 9 2.5.4工序4：扩Φ25H7的通孔 ....................................................................................... 11 2.5.5工序5：铰Φ25H7的通孔 ....................................................................................... 12 2.5.6工序6：粗铣a、b面 ............................................................................................. 182 2.5.7工序7：粗铣Φ60H12孔的两面 ............................................................................. 14 2.5.8工序8：精铣Φ60H12孔的两面 ............................................................................. 14 2.5.9工序9：粗镗下端Φ60H12的孔 ............................................................................. 15 2.5.10工序10：半精镗下端孔到Φ60H12 ...................................................................... 16 2.5.11工序11：粗铣16H11的槽 .................................................................................... 16 2.5.12工序12：半精铣16H11的槽 ................................................................................ 17 2.5.13工序13：钻Φ20.50的孔 ....................................................................................... 18 2.5.14工序14：攻M22×1.5的螺纹 .............................................................................. 19 2.5.15工序15：铣开Φ60H12的孔 ................................................................................. 20 2.6本章小结 ............................................................................................................................. 21

3 专用夹具设计 ............................................................................................................................ 22

3.1镗孔夹具设计 ..................................................................................................................... 22