零件的机械加工工艺规程设计及_夹具设计

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1、中北大学课程设计说明书学生姓名：学号：学院：机械工程与自动化学院专业：工业工程题目：指导教师：温海骏职称:讲师2013年06月03日中北大学课程设计任务书2012～2013学年第二学期学院：机械工程与自动化学院专业：工业工程学生姓名：学号：课程设计题目：起迄日期：06月03日～06月09日课程设计地点：中北大学指导教师：温海骏系主任：李瑞琴机械制造技术基础课程设计说明书设计题目：零件的机械加工工艺规程设计及夹具设计学生姓名：郭强学号：0914112105专业：机械设计制造及其自动化指导老师：晋中学院2012年6月3日目录零件的分

2、析···········································································零件的作用···········································································零件的工艺分析···································································工艺规程的设计······························

3、··········································毛坯的制造形式·······································································基准面的选择···········································································粗基准的选择····························································

4、···············精基准的选择···········································································制定的工艺路线···········································································机械加工余量、工序尺寸及毛坯尺寸的确定···························确定切削用量及基本工时································

5、···························绘制零件图和编制工艺卡···························································夹具设计···········································································夹具设计任务···········································································绘制夹具装配图···

6、········································································1.零件分析1.1零件的作用题所给的是CA6140车床上的拨叉，它位于车床变速机构中，主要起换挡作用，使主轴回转运动按照工作者的要求工作，获得所需的速度和扭矩。零件上方的Φ20mm的孔与操作机构相连，下方的Ф50mm的半孔则是用于与所控制齿轮所在的轴接触，通过上方的力拨动下方的齿轮变速，两零件铸造为一体，加工时分开。1.2零件的工艺分析CA6140车床上的拨叉共有两处加工表面。其间有一定

7、的位置要求，分述如下：1.2.1以Ф20mm为中心的加工表面这一组加工表面包括：Ф20mm的孔，以及其上下表面，孔壁上有一个装配时要钻铰的Ф8mm的锥孔，一个M6的螺纹孔，和一个缺口。1.2.2以Ф50mm为中心的加工表面这一组加工表面包括：Ф50mm的孔，以及其上、下端面；这两组表面有一定的位置要求；（1）Ф50mm的孔的上、下表面与Ф20的孔的垂直度误差为0.07mm。（2）Ф20mm的孔的上、下表面与Ф20的孔的垂直度误差为0.05mm。（3）Ф50mm、Ф20mm的孔的上、下表面以及Ф50mm的孔的内表面的粗糙度误差为3

8、.2um。（4）Ф20mm的孔的内表面的粗糙度误差为1.6um，精度为IT7。2.工艺规程设计2.1毛坯的制造形式零件材料为HT200，考虑零件在机床运行过程中所受冲击不大，零件结构又比较简单，故选择铸造毛坯。图一毛坯图2.2基准面的选择2.2.1粗基准的选择对