CA6140车床拨叉课程设计说明书

课设专用 (不应定适合所有人)

摘 要

拨叉的加工质量将直接影响机器的性能和使用寿命。本次设计旨在提高CA6140车床拨叉的加工效率，由此我们首先对拨叉的结构特征和工艺进行了仔细的分析，然后确定了一套合理的加工方案，加工方案要求简单，操作方便，并能保证零件的加工质量。在制定加工工艺规程的顺序如下： 1分析零件； 2选择毛坯；

3设计工艺规程：包括制定工艺路线，选择基准面等；

4工序设计：包括选择机床，确定加工余量，工序尺寸及毛坯尺寸，确定切削用量及计算基本工时等； 5编制工艺文件。

此外，为了提高劳动生产率，降低劳动强度，保证加工质量，需设计专用夹具，本次设计选择了第六道工序铣断双体的专用夹具设计，以满足加工过程的需要。 关键词：拨叉; 工艺规程; 夹具设计

摘 要··························································································································································1 前 言···························································································································································4 1 零件的分析········································································································································5 1．1 零件的作用····································································································································5 1．2 零件的工艺分析····························································································································5 2 工艺规程的设计·······························································································································6 2．1 毛坯的制造形式····························································································································6 2．2 基准面的选择································································································································6 2．2．1 粗基准的选择······················································································································6 2．2．2 精基准的选择······················································································································6 2．3 制定工艺路线································································································································6 2．4 机械加工余量、工序尺寸及毛坯尺寸的确定············································································8 2．5 确定切削用量及基本工时············································································································8 3 绘制零件图和编制工艺卡············································································································26 3．1 绘制零件图···································································································································26 3. 2 编制工艺文件·································································································································26 4 夹具设计············································································································································28 4．1 问题的提出·································································································································28 4．2 夹具体设计·································································································································28 4．2．1 定位基准的选择·················································································································28 4．2．2 切削力及夹紧力的计算·····································································································28

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