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。 拨叉加工工艺规程设计是包括零件加工的工艺设计、工序设计两部分。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。 关键词：工艺、工序、切削用量。 ABSTRCT This desig
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ns 目录 ABSTRCT 3 序言1 一零件的分析2 1.1零件的作用2 1.2零件的工艺分析2 二毛坯的确定3 2.1确定毛坯的制造形式3 2.2毛坯形状及尺寸3 三拟定加工工艺路线4 3.1基准的选择4 3.1.1粗基准选择4 3.1.2精基准的选择5 3.2制定工艺路线6 3.3机械加工余量、工序尺寸及毛坯尺寸的确定8 3.4确定切削用量及基本工时8 总结14 致谢16 参考文献17