机械5

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。 涡轮箱体加工工艺规程及钻孔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 第一章机床夹具介绍2 1 .1夹具的现状及生产对其提出新的要求2 1.2现代夹具的发展方向2 第二章机床夹具的定位及夹紧4 2.1概述4 2.1.1机床夹具的概念4 2.1.2机床夹具的组成4 2.1.3机床夹具的分类6 2.1.4机床夹具在机械加工中的作用8 2.2工件的装夹方式9 2.3基准及其分类10 2.4工件的定位12 2.4.1工件定位的基本原理13 2.4.2常见定位方式及定位元件14 2.5工件的夹紧14 2.5.1夹紧装置的组成及基本要求15 2.5.2夹紧力的确定15 2.5.3典型夹紧结构16 2.5.4定心夹紧机构16 第三章零件分析……………………………………………… 17 3.1零件作用………………………………………………17 3.2零件的工艺分析……………………………………… 17 第四章工艺规程设计…………………………………………… 17 4.1确定毛坯的制造形式………………………………… 17 4.2基面的选择………………………………………………18 4.3制定工艺路线………………………………………… 18 4.4确定切削用量及基本工时………………………………20 第五章夹具设计…………………………………………………28 5.1问题的提出………………………………………………28 5.2定位基准的选择…………………………………………29 5.3切削力及夹紧力计算……………………………………30 5.4定位误差分析……………………………………………31 5.5夹具设计及操作简要说明………………………………32 总结………………………………………………………………34 致谢………………………………………………………………35 参考文献…………………………………………………………36