毕业论文-ca6140车床拨叉的加工工艺及夹具设计

河南科技学院

2009届本科毕业论文（设计）

论文题目：CA6140车床拨叉的加工工艺及夹具设计

（CA6140 lathe processing technology fork

and Fixture Design）

学生姓名：张丽

所在院系：机电学院

所学专业：机电技术教育

导师姓名：田峰

完成时间：2009年5 月 25日

0

摘 要

本设计是CA6140拨叉的加工工艺规程及某道工序的专用夹具设计。CA6140拨叉的主要加工表面是三面两孔。一般来说，平面的加工精度要比孔的加工精度更容易保证。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。先将第一个待加工表面零件的左端面加工出来，再以底面为粗基准加工零件顶面，并以零件的顶面作为精基准以完

?0。021成以后的孔的加工。所以选择以零件左端面作为粗基准，以?250的孔作为精

基准，整个加工过程选用组合机床，在夹具方面选用专用夹具。考虑到本零件结构的特殊性，以及所需的夹紧力较小等原因，本零件的夹紧方式采用螺旋夹紧机构。

关键词：夹具，加工工艺，工艺规程，定位

1

CA6140 lathe processing technology fork and Fixture Design

Abstract

CA6140 fork of the design is a point of order processing technology and procedures in a dedicated fixture design. CA6140 fork of the main surface is two holes on three sides. Generally speaking, the plane of the machining accuracy of the machining accuracy than the hole more easily guarantee. Therefore, the first surface of the design followed the principles of post-holes, and holes with the two-dimensional processing clearly divided into roughing and finishing stages of processing to ensure the accuracy of the hole. First processing the surface of the first parts to be left out of face processing, and then to the bottom parts for rough machining the top face of the base and top parts as to complete the baseline precision of the hole after the processing.And therefore he chose to spare parts as a left-side

?0。021rough, with a precision of the ?250hole as a benchmark,the whole combination of

machine tool selection process, in selected aspects of exclusive jig fixture. Taking into account the specificity of the structure of the parts, as well as a smaller clamping force required for other reasons, the parts of the clamping means clamping screw body to adopt.

Keywords: Fixture ,Components processing ,technology Process, Positioning

2

目 录

引言 ................................................................................................................................ 4 1 机床夹具 .................................................................................................................... 4 1.1机床夹具的发展现状 .......................................................................................... 4 1.2机床夹具的分类与构成 ...................................................................................... 5 1.2.1机床夹具的分类 ............................................................................................ 5 1.2.2机床夹具的构成 ............................................................................................ 6 2 零件的加工工艺规程设计 ........................................................................................ 6 2.1零件的分析 .......................................................................................................... 6 2.1.1零件的作用： ................................................................................................ 6 2.1.2零件的工艺分析： ........................................................................................ 7 2.2工艺规程设计 ...................................................................................................... 7 2.2.1确定毛坯的制造形式 .................................................................................... 7 2.2.2基准面的选择 ................................................................................................ 7 2.2.4机械加工余量、工序尺寸及毛坯尺寸的确定 ............................................ 9 2.2.5切削用量及基本工时的确定 ...................................................................... 10 3专用夹具设计 ........................................................................................................... 16 3.1问题提出 ............................................................................................................ 16 3.2钻M8底孔Φ6.7、攻丝M8，配钻M5锥孔专用夹具设计 .......................... 16 3.2.1定位基准的选择 .......................................................................................... 16 3.2.2切削力和夹紧力的计算 .............................................................................. 16 3.2.3定位元件的设计及定位误差分析 .............................................................. 17 图 3 花键轴 ......................................................................................................... 18 3.2.4导向方案及导向元件的设计 ...................................................................... 18 3.2.5夹具体的设计 .............................................................................................. 19 3.2.6夹具装配图效果图 ...................................................................................... 20 4结束语 ....................................................................................................................... 20 5谢词 ........................................................................................................................... 21 参考文献 ...................................................................................................................... 22

3