摘要 本次设计内容涉及了机械制造工艺及机床夹具设计、金属切削机床、公差配合与测量等多方面的知识。 拨叉831007加工工艺规程及夹具设计是包括零件加工的工艺设计、工序设计以及专用夹具的设计三部分。在工艺设计中要首先对零件进行分析，了解零件的工艺再设计出毛坯的结构，并选择好零件的加工基准，设计出零件的工艺路线；接着对零件各个工步的工序进行尺寸计算，关键是决定出各个工序的工艺装备及切削用量；然后进行专用夹具的设计，选择设计出夹具的各个组成部件，如定位元件、夹紧元件、引导元件、夹具体与机床的连接部件以及其它部件；计算出夹具定位时产生的定位误差，分析夹具结构的合理性与不足之处，并在以后设计中注意改进。 关键词：工艺、工序、切削用量、夹紧、定位、误差。 ABSTRCT This desig
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n, the error 目录 摘要1 ABSTRCT 2 目录3 一零件分析5 1.1零件作用5 1.2零件的工艺分析5 1.3生产纲领5 1.4生产类型6 二零件毛胚形式确定7 三工艺规程设计8 3.1定位基准的选择8 3.1.1粗基准的选择8 3.1.2精基准的选择8 3.2制定加工工艺路线9 3.3选择加工设备及工艺装备10 3.4加工工序设计、工序尺寸计算11 3.5选择切削用量、确定时间定额12 四夹具设计24 4.1问题提出24 4.2定位基准的选择24 4.3定位的基本原理24 4.3.1六点定位原理24 4.3.2工件定位中可能出现的一下几种情况25 4.4夹紧方案的设计25 4.5夹紧装置的设计25 4.5.1夹紧装置的组成25 4.5.2对夹紧装置的基本要求25 4.6切削力和夹紧力的计算26 4.7定位误差分析26 4.8夹具设计及简要操作说明27 总结28 参考文献29 一零件分析 1.1零件作用 题目所给的零件是CA6140车床的拨叉。它位于车床变速机构中，主要起换档，使主轴回转运动按照工作者的要求工作，获得所需的速度和扭矩的作用。零件上方的φ22孔与操纵机构相连，二下方的φ55半孔则是用于与所控制齿轮所在的轴接触。通过上方的力拨动下方的齿轮变速。两件零件铸为一体，加工时分开。