机械制造技术课程设计-变速器换挡叉加工工艺及铣叉脚端面夹具设计

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1、机械制造技术课程设计说明书机械制造工艺课程设计说明书题目：变速器换挡叉叉脚端面铣夹具设计-31-机械制造技术课程设计说明书目录一、零件分析··················································31.1零件的作用············································31.2零件的工艺分析········································31.3尺寸和粗糙度的要求····································3

2、1.4位置公差要求···········································4二、毛坯的设计··············································42.1选择毛坯··············································42.2确定机加工余量、毛坯尺寸和公差··························42.3-31-机械制造技术课程设计说明书确定机械加工加工余量·································42.4

3、确定毛坯·············································52.5确定毛坯尺寸公差·····································42.6设计毛坯图············································4三、选择加工方法，拟定工艺路线································73.1基面的选择············································73.2粗基准的选择···········

4、·······························83.3精基准的选择··········································143.4制定机械加工工艺路线······-31-机械制造技术课程设计说明书····························15四、加工设备及道具、夹具、量具的选择···························15五、确定切削用量·············································18六、基本时间的确定···········

5、·······························20七、夹具设计···············································25八、总结·····················································29一、零件分析1.1零件的作用题目所给定的零件是变速器换档叉（如下图2-1所示），它位于传动轴的端部。主要作用是传递扭矩，使变速器获得换档的动力。该零件是以孔套在轴上，并用M10×1-7H螺纹孔与轴定位，换挡叉脚卡在双联齿轮的轴中，变速操作机构通过换挡叉

6、头部的操纵槽带动换挡叉与轴一起在变速箱中滑动，换挡叉脚拨动双联齿轮在花键轴上滑动，就可实现变速功能，从而实现变速器变速。换挡叉的主要工作面为操纵槽换挡叉脚两端面，主要配合面为孔，M10×-31-机械制造技术课程设计说明书1-7H螺纹孔和换挡叉脚侧面.该零件属于特殊形状零件，但复杂程度一般。由于换挡叉在工作是表面承受一定的压力，因此，要求有一定的强度和韧度。全套图纸，加1.2零件的工艺分析由零件图可知，该零件的材料为35#钢，锻造成型，由零件的尺寸公差选择模锻加工成型，保证不加工表面达到要求的尺寸公差。该零件需要加工的表面可大致分为以下四类：

7、（1）Φ15.81的孔。（2）以Φ15.81孔的轴心线为基准的上下两平面。（3）两插口端面。（4）两叉口内侧面。（5）拔槽两个侧面。（6）拨槽的内侧面面（7）M10*1-7H的螺纹孔。其中Φ15.8的孔以及叉口的上下端面和叉口的中间两侧面为主要的配合面，加工的精度及粗糙度的要求较高，应作为加工的重点1.3尺寸和粗糙度的要求Φ15.81的孔的上偏差为+0.043，下偏差为+0.016，配合公差为F8，属于间隙配合，孔的内表面的粗糙度为3.2，要求较高，鉴于孔径为15.81，可先采用Φ15.81的麻花钻钻孔，在用Φ10的立铣刀进行扩孔，最后用无

8、心砂轮进行精加工。Φ-31-机械制造技术课程设计说明书15.81的孔的上下两平面距离孔中心线的尺寸分别为11mm和12.7mm，上表面的粗糙度为6.3，下表面的粗糙度为12.5，