毕业论文 C6140杠杆加工及其工艺夹具设计

CA6140杠杆加工工艺

及夹具设计

摘 要

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

45外圆面作为粗基准，以 25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

ABSTRACT

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

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 ........................................................................................................................................ 23

3 专用夹具设计 ............................................................................................................................. 24

3.1加工工艺孔Φ25夹具设计 ................................................................................................... 24

3.1.1定位基准的选择 ......................................................................................................... 24 3.1.2切削力的计算与夹紧力分析 ..................................................................................... 24 3.1.3夹紧元件及动力装置确定 ......................................................................................... 25 3.1.4钻套、衬套、钻模板及夹具体设计 ......................................................................... 26 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

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