机械5

摘要 机械制造基础课程设计是我们学完了大学的机械制造基础课程、技术基础课以及大部分专业课之后进行的。这是我们大学中进行的第二次的课程设计，每次课程设计对设计有着很大的帮助。 这次设计的是拨叉，有零件图、毛坯图、装配图各一张，机械加工工艺过程卡片和与所设计夹具对应那道工序的工序卡片各一张。首先我们要熟悉零件，题目所给的零件是拨叉。了解了拨叉的作用，接下来根据零件的性质和零件图上各端面的粗糙度确定毛坯的尺寸和机械加工余量。然后我们再根据定位基准先确定精基准，后确定粗基准，最后拟定拨叉的工艺路线图，制定该工件的夹紧方案，画出夹具装配图。 关键词：工序切削用量夹紧定位误差 Abstract Machi
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n,clamp,the error 目录 1、拨叉的工艺分析及生产类型的确定1 1.1、拨叉的用途1 1.2、审查拨叉的工艺性1 1.3、确定拨叉的生产类型2 2、确定毛坯、绘制毛坯简图3 2.1选择毛坯3 2.2确定毛坯的尺寸公差和机械加工余量3 2.2.1公差等级3 2.2.3绘制拨叉毛坯简图3 3、拟定拨叉工艺路线4 3.1、定位基准的选择4 3.1.1．精基准的选择4 3.1.2．粗基准的选择4 3.2、加工阶段的划分4 3.3、工序的集中与分散4 3.4、工序顺序的安排4 3.4.1机械加工工序4 3.4.2．热处理工序5 3.4.3．辅助工序5 3.5、确定工艺路线5 4、加工余量、工序尺寸和工差的确定9 4.1.确定切削用量及基本工时9 4.2.其他时间的计算14 5.夹具设计16 5.1提出问题16 5.2设计思想16 5.3夹具设计16 5.3.1定位分析16 总结18 参考文献20