机械5

汽车发动机曲轴的加工及夹具的设计 摘要 现代化的机械行业结构变化很大，对于加工单位来说设计工艺水平对他们的影响是非常关键的。夹具行业的发展是非常快的，里面设计的是汽车发动机曲轴的加工工艺及夹具的设计。 一开始阐述了零件，之后将毛坯的加工形式确定下来，将工艺路线定下来，还有将机械加工余量，切削余量等等都定下来。用绘图软件将零件图，还有毛坯图纸都画出来。本次专用夹具为：铣宽10mm键槽而设计的铣床专用夹具。设计专用夹具的时候，将定位的方案，还有夹紧方案都定下来，确定下来定位零件，夹紧部件，确定导向装置等等，将切削力和夹紧力的数值算出来。将装配图还有非标零件图纸画出来的时候用的是AutoCAD软件。 关键词：汽车发动机、曲轴、加工工艺、10mm键槽、专用夹具 ABSTRACT The structure of moder
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nology, 10mm keyway, special fixture 目录 摘要I ABSTRACT I 1零件的工艺性分析1 1.1零件的组成表面、技术要求及形位公差分析1 1.1.1零件的组成表面分析1 1.1.2零件的技术要求分析1 1.1.3零件的形位公差分析1 1.2零件的作用2 1.3零件的工艺性审查2 1.4确定零件的生产类型3 2拟定零件工艺路线及确定毛坯4 2.1选择定位基准4 2.1.1粗基准的选择4 2.1.2精基准的选择4 2.2工艺过程设计中应考虑的主要问题4 2.2.1加工方法选择的原则4 2.2.2加工阶段的划分5 2.2.3工序的合理组合6 2.3制定工艺路线6 2.4零件毛坯的确定8 2.5机床、夹具、刀具及量具的确定8 2.6零件加工余量的确定9 2.7切削用量及时间定额的计算12 3铣10mm键槽专用夹具设计33 3.1机床夹具的介绍33 3.2问题的提出33 3.3选择定位方案和定位元件33 3.4选择夹紧方案和夹紧元件34 3.5夹具体的设计34 3.6导向装置选择36 3.7铣削力计算36 3.8夹紧力计算36 3.9定位误差分析37 结论38 致谢39 参考文献40