CA6140车床拨叉831003工艺及铣左端面夹具设计[含CAD图纸 工序卡 工艺过程卡 说明书]版本3

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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