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nowledge. 目录 1拔叉零件的工艺分析1 2机械加工工艺设计2 2.1确定生产类型2 2.2确定毛坯2 2.2.1确定毛坯种类2 2.2.2确定铸件加工余量及形状2 2.3绘制拔叉铸造毛坯简图3 3拟定拔叉工艺路线3 3.1定位基准的选择3 3.1.1精基准的选择4 3.1.2粗基准的选择4 3.2制定工艺路线4 3.3表面加工方法的确定5 3.4加工阶段的划分5 3.5工序的集中与分散6 3.6工序顺序的安排6 3.7确定工艺路线6 4加工余量、工序尺寸和公差的确定7 4.1钻φ25孔的工序尺寸7 4.2钻孔工步7 4.3时间定额的计算8 4.4其它时间计算8 5夹具设计8 5.1夹具选择8 5.1.1问题的提出10 5.1.2夹具设计10 5.2夹具设计及操作的简要说明10 6机床夹具设计体会与展望11 7参考文献13