设计简介
摘 要
这次设计的是十字轴机械加工工艺规程及工艺装备设计，包括零件图、毛坯图、装配图各一张，机械加工工艺过程卡片和与工序卡片各一张。首先我们要熟悉零件和了解其作用，它位于车床变速机构中，主要起换档作用。然后，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械加工余量。最后拟定拨差的工艺路线图，制定该工件的夹紧方案，画出夹具装配图。
就我个人而言，我希望能通过这次课程设计，了解并认识一般机器零件的生产工艺过程，巩固和加深已学过的技术基础课和专业课的知识，理论联系实际，从中锻炼自己分析问题、解决问题的能力，为今后的工作打下一个良好的基础，并且为后续课程的学习打好基础。
Abstract
This time I design the lathes of the shift forks , including that the part pursuing , the blank pursues , assembling pursues , the machine work procedure card the working procedure card every sheet .We should know the part very well and know its effect first , it is worked in the organization which is used for change the speed in a lathe, and the mainly role of the part is alter the speed. Then, we design the dimension of the blank and instrument process a margin of the part according to part character and the harshness of each face .Finally, I design the handicrafts route picture of the shift forks, work out the fastening motion scheme being workpiece's turn , draw up clamp assembling picture.
As far as my individual be concerned, I want to knowing the general productive technology of machine part , consolidating and deepening the knowledge of basic course and specialized course what I have already learned , integrates theory with practice, and improve the
ability to solve problems, what’s more , striking the basis for the future work and the following course’s studying .
目录
一、零件的工艺分析... 1
二.机械加工工艺设计... 2
1、确定生产类型. 2
2、确定毛坯. 2
2.1、确定毛坯种类：. 2
2.2、确定锻件加工余量及形状：. 2
三、工艺规程设计... 4
3.1选择定位基准：. 4
3.2制定工艺路线: 4
3.3表面加工方法的确定. 5
3.4加工阶段的划分. 5
3.5工序顺序的安排. 5
3.6确定工艺路线. 6
四.机械加工余量、工序尺寸及公差的确定... 7
4.1 钻铰φ8丝孔 的工序尺寸. 7
4.1.1.钻Φ5丝孔，以φ25轴线为基准。. 7
4.2.2 钻孔工步. 7
4.3时间定额的计算：. 7
4.4 其它时间计算. 8
五、夹具设计... 9
5.1夹具选择. 9
5.1.1问题的提出. 9
5.1.2夹具设计. 10
5.2、定位误差分析. 10
5.3、夹具设计及操作的简要说明. 11
六.参考文献... 12
