毕业设计（论文）
CA6140 杠杆加工工艺
及夹具设计
学生姓名：
学生学号：
院 （系）： 机电工程学院
年级专业：03 级机械设计制造及其自动化
指导教师：
二〇〇七年六月
毕业设计 摘 要
I
摘 要
本设计是 CA6140 杠杆零件的加工工艺规程及一些工序的专用夹具设计。
CA6140 杠杆零件的主要加工表面是平面及孔。一般来说，保证平面的加工精度要
比保证孔的加工精度容易。因此，本设计遵循先面后孔的原则。并将孔与平面的
加工明确划分成粗加工和精加工阶段以保证孔的加工精度。基准的选择以杠杆
45F
外圆面作为粗基准，以
25F
孔及其下表面作为精基准。先将底面加工出来，
然后作为定位基准，在以底面作为精基准加工孔。整个加工过程选用组合机床。
在夹具方面选用专用夹具。考虑到零件的结构尺寸简单，夹紧方式多采用手动夹
紧，夹紧简单，机构设计简单，且能满足设计要求。
关键词 杠杆零件，加工工艺，夹具，定位，夹紧
毕业设计 ABSTRACT
II
ABSTRACT
This paper is to design the craft processes of making the CA6140 lever spare parts
and some specialized tongs in the process. The CA6140 lever spare part primarily
processes the surface and bores. Generally speaking, to guarantee the accuracy of the flat
surface process is easier than that of the bore. Therefore, this design follows the principle
that surface first and then the bore, and definitely divides the process of flat surface and
bore into coarse processes and precise processes to guarantee the bore processes. The
basic choice is to consider 45 outside circle as rough basis and to consider 25 bore and its
next surface as precise basis. The bottom is first processed out to be fixed position basis,
and process the bore using the bottom as the precise basis. The whole processes choose
the machine bed. In the aspects of tongs choosing, specialized tongs are used. In
consideration of the simple construction size of the spare parts, clipping by hands is
adopted. It is simple, and the organization design is simple, and can satisfy the design
request.
Key Words Lever spare parts, craft proces , tongs, fixed position, tight clip
毕业设计 目录
1
摘 要 ..................................................................................................................................Ⅰ
ABSTRSCT ..............................................................................................................................................Ⅱ
1 绪论 ..................................................................................................................................................1
1.1 课题背景及发展趋势 ...............................................................................................................1
1.2 夹具的基本结构及设计内容 ..................................................................................................1
2 杠杆加工工艺规程设计..............................................................................................................3
2.1 零件的分析 ...............................................................................................................................3
2.1.1 零件的作用 ...................................................................................................................3
2.1.2 零件的工艺分析 ...........................................................................................................3
2.2 杠杆加工的主要问题和工艺过程设计所应采取的相应措施 ...............................................4
2.2.1 确定毛坯的制造形式 ...................................................................................................4
2.2.2 基面的选择 ...................................................................................................................4
2.2.3 确定工艺路线 ...............................................................................................................4
2.2.4 机械加工余量、工序尺寸及毛坯尺寸的确定 ...........................................................5
2.2.5 确定切削用量 ...............................................................................................................6
2.2.6 确定基本工时 .............................................................................................................17
2.3 小结 .........................................................................................................................................22
3 专用夹具设计 ..............................................................................................................................23
3.1 加工工艺孔Φ25 夹具设计 ....................................................................................................23
3.1.1 定位基准的选择 .........................................................................................................23
3.1.2 切削力的计算与夹紧力分析 .....................................................................................23
3.1.3 夹紧元件及动力装置确定 .........................................................................................24
3.1.4 钻套、衬套、钻模板及夹具体设计 .........................................................................25
3.1.5 夹具精度分析 .............................................................................................................27
3.1.6 夹具设计及操作的简要说明 .....................................................................................27
3.2 粗精铣宽度为 30mm 的下平台夹具设计 ...............................................................................28
3.2.1 定位基准的选择 .........................................................................................................28
3.2.2 定位元件的设计 .........................................................................................................28
3.2.3 定位误差分析 .............................................................................................................29
3.2.4 铣削力与夹紧力计算 .................................................................................................29
3.2.5 夹具体槽形与对刀装置设计 .....................................................................................30
3.2.6 夹紧装置及夹具体设计 .............................................................................................32
毕业设计 目录
2
3.2.7 夹具设计及操作的简要说明 .....................................................................................33
3.3 钻 M8 螺纹孔夹具设计 ...........................................................................................................33
3.3.1 定位基准的选择 .........................................................................................................33
3.3.2 定位元件的设计 .........................................................................................................34
3.3.3 定位误差分析 .............................................................................................................35
3.3.4 钻削力与夹紧力的计算 .............................................................................................35
3.3.5 钻套、衬套、钻模板及夹具体设计 .........................................................................36
3.3.6 夹紧装置的设计 .........................................................................................................38
3.3.7 夹具设计及操作的简要说明 .....................................................................................38
3.4 小结 .........................................................................................................................................39
4 总结..............................................................................................................................................40
参考文献 ..............................................................................................................................................41
致 谢.....................................................................................................................................................42
