机械5

支架的工艺及钻夹具设计 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。 支架零件的工艺规程及其钻孔的工装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：支架、夹具设计、工艺路线 Abstract The desig
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n, process route 目录 摘要I Abstract II 1概述发展1 1.1机床夹具简介1 1.1.1 1 1.1.2机床夹具的组成1 1.1.3夹具设计的步骤和基本要求1 2计算生产纲领、确定生产类型7 2.1生产纲领7 2.2生产类型7 3零件分析9 3.1零件的结构分析9 3.1.1零件图分析9 3.1.2结构工艺性分析9 3.2零件的技术要求分析9 3.2.1加工表面的尺寸精度和形状精度9 3.2.2主要加工表面之间的相互位置精度10 支架主要加工表面为： 10 3.2.3加工表面的粗糙度10 4工艺规程设计12 4.1定位基准的选择12 4.2制定加工工艺路线13 4.2.1各表面加工方法选择13 4.2.2加工工艺路线方案14 4.2.3确定加工工艺路线14 4.3毛坯余量15 4.4选择切削用量、确定时间定额15 5机床专用夹具31 5.1专用夹具的提出31 5.2定位基准的选择31 5.3定位误差分析31 5.4切削力的计算与夹紧力分析32 5.5绘制装配图33 总结35 参考文献36