机械5

高低档拨叉零件的机械加工工艺及钻Ф5孔的夹具设计 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。 高低档拨叉加工工艺规程及其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 序言…………………………………………………………………1 一.零件分析……………………………………………………2 1.1零件作用………………………………………………2 1.2零件的工艺分析…………………………………………3 二.工艺规程设计…………………………………………………4 2.1确定毛坯的制造形式……………………………………4 2.2基面的选择……………………………………………… 5 2.3制定工艺路线……………………………………………8 2.4机械加工余量、工序尺寸及毛坯尺寸的确定…………9 2.5确定切削用量及基本工时………………………………10 三夹具设计………………………………………………………16 3.1问题的提出………………………………………………16 3.2定位基准的选择…………………………………………16 3.3切削力及夹紧力计算……………………………………17 3.4定位误差分析……………………………………………18 3.5夹具设计及操作简要说明………………………………19 总结………………………………………………………………20 致谢………………………………………………………………21 参考文献…………………………………………………………22