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目 录
摘要…………………………....………………….……………………...Ⅰ
ABSTRACT.....................................................................................................Ⅱ
1 绪论..........................................................................................................3
2 拨叉C的分析.............................................................................................4
2.1拨叉C的作用...........................................................................................4
2.2拨叉C的工艺分析.....................................................................................4
2.3拨叉C的工艺要求.....................................................................................4
2.4毛坯的选择..............................................................................................5
2.5 本章总结................................................................................................5
3 工艺规程设计.............................................................................................6
3.1加工工艺过程...........................................................................................6
3.2确定各表面加工方案..................................................................................6
3.2.1选择加工方法时,需考虑的因素.............................................................6
3.2.2面的加工...........................................................................................6
3.2.3孔的加工...........................................................................................7
3.2.4槽的加工...........................................................................................7
3.3确定定位基准...........................................................................................7
3.3.1粗基准的选择.....................................................................................7
3.3.2精基准选择的原则...............................................................................8
3.4工艺路线的拟订........................................................................................8
3.4.1工序的合理组合..................................................................................8
3.4.2工序的集中与分散...............................................................................9
3.4.3加工阶段的划分................................................................................10
3.4.4加工工艺路线方案的比较....................................................................11
3.5拨叉C的偏差,加工余量,工序尺寸及毛坯尺寸的确定.......................................12
3.5.1毛坯的结构工艺要求..........................................................................12
3.5.2拨叉C的偏差计算.............................................................................13
3.6确定切削用量及基本工时(机动时间)..........................................................14
3.7时间定额计算及生产安排..........................................................................22
3.7.1钻预制孔.........................................................................................22
3.7.2钻预制孔.........................................................................................23
3.7.3拉25H7内花键................................................................................23
3.7.4粗、精铣18H11底槽........................................................................................23
3.7.5粗、精铣上端面...............................................................................................24
3.7.6钻、攻2-M8螺纹孔.........................................................................................25
3.8 本章总结..............................................................................................................26
4 专用夹具设计..........................................................................................................27