机械5

摘要 此次设计是对拨叉零件的加工工艺和夹具设计，其零件为铸件，具有体积小，零件复杂的特点，由于面比孔易加工，在制定工艺规程时，就先加工面，再以面为基准来加工其它，其中各工序夹具都采用专用夹具，特别的对于加工大头孔、槽和钻小头孔斜面小孔的工序中，选一面两销的定位方式，并以操作简单的手动夹紧方式夹紧，其机构设计简单，方便且能满足要求。 关键词拨叉，加工工艺，专用夹具，设计 ABSTRACT This desig
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n 目录 1绪论1 2拨叉的分析2 2.1拨叉的工艺分析2 2.2拨叉的工艺要求3 3工艺规程设计4 3.1加工工艺过程4 3.2确定各表面加工方案4 3.2.1影响加工方法的因素4 3.2.2加工方案的选择5 3.3确定定位基准5 3. 3.1粗基准的选择6 3. 3.2精基准选择的原则6 3.4工艺路线的拟订7 3.4.1工序的合理组合7 3.4.2工序的集中与分散8 3.4.3加工阶段的划分9 3.4.4加工工艺路线方案的比较10 3.5拨叉的偏差，加工余量，工序尺寸及毛坯尺寸的确定11 3.5.1毛坯的结构工艺要求11 3.5.2拨叉的偏差计算12 3.6确定切削用量及基本工时（机动时间） 13 3.7时间定额计算及生产安排19 4钻孔夹具设计22 4． 1研究原始资料22 4． 2定位基准的选择22 4． 3切削力及夹紧力的计算23 4． 4误差分析与计算24 4.5零、部件的设计与选用25 4.5.1定位销选用25 4.5.2夹紧装置的选用26 4.5.3钻套、衬套、钻板设计与选用26 4． 6夹具设计及操作的简要说明28 结论·······················································································29 参考文献···················································································30