机械5

支座零件的工艺规程及钻M 8螺纹孔夹具设计 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。 支座加工工艺规程及其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 摘要1 ABSTRCT 2 序言3 一机床夹具介绍4 1 .1夹具的现状及生产对其提出新的要求4 1.2现代夹具的发展方向5 二零件的分析7 2.1零件的作用7 2.2零件的工艺分析7 三.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10 3.4机械加工余量、工序尺寸及毛坯尺寸的确定12 3.5确立切削用量及基本工时13 四机床夹具的定位及夹紧22 4.1概述22 4.1.1机床夹具的概念22 4.1.2机床夹具的组成22 4.1.3机床夹具的分类23 4.1.4机床夹具在机械加工中的作用25 4.2工件的装夹方式26 4.3基准及其分类27 4.4工件的定位29 4.4.1工件定位的基本原理29 4.4.2常见定位方式及定位元件30 4.5工件的夹紧31 4.5.1夹紧装置的组成及基本要求31 4.5.2夹紧力的确定32 4.5.3典型夹紧结构33 4.5.4定心夹紧机构33 4.6专用夹具设计34 4.6.1对机床专用夹具的基本要求34 4.6.2专用夹具设计方法和步骤34 4.6.3夹具总图技术要求的制订35 五夹具设计37 5.1问题的提出37 5.2定位基准的选择37 5.3切削力和夹紧力的计算38 5.4定位误差分析39 5.5夹具设计及操作的简要说明39 总结40 致谢41 参考文献42