机械5

汽车变速箱盖的工艺规程及夹具设计 摘要 汽车变速箱盖零件加工工艺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 Process pla
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ng 目录 摘要II 第1章序言6 第2章零件的分析7 2.1零件的形状7 2.2零件的工艺分析7 第3章工艺规程设计9 3.1确定毛坯的制造形式9 3.2基面的选择9 3.3制定工艺路线9 3.3.1工艺路线方案一10 3.3.2工艺路线方案二10 3.3.3工艺方案的比较与分析11 3.4选择加工设备和工艺装备12 3.4.1机床选用12 3.4.2选择刀具12 3.4.3选择量具12 3.5机械加工余量、工序尺寸及毛坯尺寸的确定12 3.6确定切削用量及基本工时14 第4章车SR20夹具设计27 4.1车床夹具设计要求说明27 4.2车床夹具的设计要点28 4.3定位机构29 4.4夹紧机构29 4.5零件的车床夹具的加工误差分析30 4.6确定夹具体结构尺寸和总体结构31 4.7零件的车床专用夹具简单使用说明32 总结33 参考文献34 致谢35