摘要：机械加工工艺过程包括结构工艺性分析、基准的选择、毛坯的选择、加工余量的确定、工艺路线的拟定、工序尺寸及公差的确定和加工设备的选择等。工艺路线是连接产品设计和制造的纽带，是一项需要多方面知识的工作，因此工艺路线的设定极为复杂，需通过考虑是工序集中还是工序分散来制定工艺路线。另外，加工余量的确定需要遵守一定的原则，并通过查表计算而得。简单的工序尺寸及其公差可以根据零件图直接得到，但复杂的需要进行尺寸链的计算得到。最后填写相关的工艺文件。为提高劳动生产率，保证加工质量和改善劳动条件，同时还需设计专用的夹具。在机床夹具设计中，不仅追求结构和理性同时还需保证精度的准确性以及各种定位方式。结构方案确定以后，绘制主要的零件图和装配图。37179
毕业论文关键词：加工工艺，加工余量，夹具设计。
Casing mechanical processing technology and fixture design
Abstract: Machining processes including structural manufacturability analysis, benchmark choice, the choice of blank, the determination of machining allowance, the drafting of process route, process dimension and tolerance determination and selection of processing equipment, etc. Craft route is connected to the product design and manufacturing, is a need to knowledge work, set is very complex, so the process need to be by considering is the focus of the process or procedure to develop a process route. In addition, the determination of machining allowance need to follow certain principles, and through calculation of the look-up table. Simple process dimension and its tolerance can be according to part drawing directly, but complex need the dimension chain is calculated. The last fill in the relevant process documents. In order to improve the labor productivity, to guarantee the machining quality and improve working conditions, and at the same time also need to design special fixture. In machine tool fixture design, not only the pursuit of rational structure and at the same time also need to ensure the accuracy of the precision as well as a variety of positioning way. Structure scheme to determine, after drawing the main detail drawing and assembly drawing.
Key words: Machining process, machining allowance, fixture design.         
 目  录
1  绪论    1
1.1 机械加工工艺概述    1
1.2 设计内容及步骤    1
2  零件的分析    2
2.1 零件的作用    2
2.2零件的结构特点    2
2.3 零件的技术要求    3
2.4 零件的工艺分析    3
3  工艺规程设计    4
3.1 确定毛坯的制造形式    4
3.2 基面的选择    5
3.3 制定工艺路线    6
3.4 机械加工余量及毛坯尺寸确定    10
3.5 确定主要工序的切削用量及基本工时    11
4  夹具设计    24
5 总结    29
  致谢    30
  参考文献    31
  附录    32
1 绪论
1.1机械加工工艺概述
（1）机械加工工艺的重要性
     工艺技术是制造技术重要的组成部分，提高工艺技术水平是提高国际市场竞争力的有力措施，也是制约中国制造业企业迅速发展的因素之一。目前，普遍存在一种“重设计、轻工艺”的现象，不过我国也已经渐渐的意识到这点并提出了“工艺出精品，精品出效益”的论断。工艺技术是及其重要的，必须有足够的重视。
（2）机械加工工艺的发展 箱体机械加工工艺及夹具设计+CAD图纸:http://www.751com.cn/jixie/lunwen_35886.html