CA6140车床的型号831002拨叉零件的机械加工工艺规程及夹具设计
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机械制造工艺学课程设计是在我们学完了大学的全部基础课、技术基础课以及大部分专业课之后进行的.这是我们在进行毕业设计之前对所学的各种课程的一次深入而综合的总复习,也是一次理论联系实际的训练.因此,它在我们四年的大学生活中占有重要的地位。
就我个人而言，我希望能通过这次课程设计,能够综合地系统化地掌握所学过的知识并加以应用,对自己未来将从事的工作进行一次适应性训练，同时从中锻炼自己分析问题、解决问题的能力，以便于以后更好地投入工作，为未来做好打算。
一.拨叉的工艺分析及生产类型的确定
1.拨叉的用途
该拨叉应用在CA6140型车床变速箱传动轴上的换档机构中.该拨叉头以Φ25mm孔套在变速叉轴上,并用螺钉经螺纹孔M22mm与变速叉轴联结,拨叉脚则夹在两齿轮之间.当需要变速时,操纵变速手柄,变速操纵机构就通过拨叉壁部的操纵槽带动拨叉与变速叉轴一起在变速箱中滑移,拨叉脚拨动三联滑移变速齿轮在花键轴上滑动以改变档位,从而改变车床主轴的旋转速度.
该拨叉是在停车时用于换档的,承受的弯曲应力和冲击载荷较小,因此零件应具有的强度和韧性均不高.该零件的主要工作表面为拨叉脚两端面、叉轴也(H7)、锁销螺纹孔M22×1.5mm、拨叉长槽,在设计工艺规程时应予以保证.
目 录
序言······························································2
CA6140车床的型号831002拨叉工艺规程设计
一.拨叉的工艺分析及生产类型的确定·································2
1.拨叉的用途···················································3
2.拨叉的技术要求···············································3
3.审查拨叉的工艺性·············································4
4.确定拨叉的生产类型···········································4
二. 确定毛坯,绘制毛坯简图·········································4
1.选择毛坯······················································4
2.确定毛坯的尺寸公差和机械加工余量······························5
三.拟定拨叉工艺路线···············································5
1. 基面的选择···················································5
2.表面加工方法的确定表面加工方法的确定··························6
3.加工阶段的划分················································6
4.工序的集中与分散···············································6
5.确定拨叉的生产类型············································6
6.工艺路线的确定················································7
四．机械加工余量、工序尺寸及公差的确定·······························8
五. 拨叉φ60孔切削用量、时间定额的计算·······························9
1.切削用量计算····················································10
2.时间定额的计算·················································10
六．机床夹具设计·····················································12
1.设计应考虑的问题················································12
2.定位方案设计····················································13
3. 工件误差分析计算···············································13
4. 导向元件设计···················································14
5.夹紧装置设计····················································14
6夹紧力与切削力的计算·············································16
7.夹具体的设计·····················································16
参考文献·······························································18 ...
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