摘要 机械制造技术设计，是以切削理论为基础，制造工艺为主线，兼顾工艺装备知识的机械制造技术基本涉机能力培养的实践课程；是综合运用机械制造技术的基本知识，基本理论和基本技能，分析和解决实际工程问题的一个重要教学环节；是对学生运用掌握的“机械制造”技术基础 知识及相关知识的一次全面的应用训练。 后罗拉过桥摇臂钻、攻Φ47H8孔端面的3-M6螺纹的专用夹具设计，本套设计是由套筒与Φ47H8孔相配合，共限制五个自由度，另外一个旋转的自由度则是由一个圆柱来限制，这样工件就实现了完全定位，工件的夹紧则是由螺栓、螺母与快换垫圈等相配合来实现的，当松动螺母后，即可取下快换垫圈，然后取下钻模板，进而可以取下工件，这样操作简单，生产效率也高，工件的导向部分则是由快换钻套、钻套用衬套，钻模板及钻套螺钉等几部分组成。由于能力有限，设计尚有许多不足之处，恳请各位老师给予批评指正。 关键词：机械加工、工艺规程、专用夹具 Abstract Mecha
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ng, process, special fixture 目录 1.后罗拉过桥摇臂的加工工艺规程设计1 1.1零件的分析1 1.1.1零件的作用1 1.1.2零件的工艺分析1 1.2确定毛坯2 1.2.1确定毛坯种类2 1.2.2确定锻件加工余量及形状2 1.2.3绘制锻件零件图3 2.工艺规程设计3 2.1选择定位基准3 2.1.1粗基准的选择3 2.1.2精基准的选择3 2.2工艺路线的拟定4 2.2.1确定工序的原则4 2.2.2工序的特点5 2.2.3加工精度的划分5 2.3制定工艺路线6 2.4选择加工设备和工艺设备8 2.5机械加工余量、工序尺寸及工时的确定9 3.专用夹具设计28 3.1钻床夹具设计28 3.1.1问题的提出28 3.2夹具的设计28 3.2.1定位基准的选择28 3.2.2定位元件及夹紧元件的设计计算与选择28 3.2.3夹紧元件选用压板29 3.3误差分析与计算29 结束语31 谢辞32 参考文献33 1后罗拉过桥摇臂的加工工艺规程设计 1.1零件的分析 1.1.1零件的作用 由于零件是机械零件中的后罗拦过桥摇臂，13.5X25的孔用来装配摇臂轴，轴的两端各安装一进气、排气的气问摇臂。Φ78的孔内装一个减压轴，用于降低汽缸内压力，便于启动柴油机。