1、 第 1 页 摘摘 要要 此次毕业设计的目的是对零件加工工艺的编写及加工中所需夹具设计。 首先， 零件材料是铸铁，零件的底面和侧面是设计基准，底面有 14125 槽及 54125 槽， 上表面 C 有通孔 13， 侧面基准上有螺纹孔 M10， 左边支臂有通孔 25 通孔。 其次，根据零件分析可知，零件的基准应为下底面，14125 槽和 25 孔的轴心 线，底面基准的加工需增加工艺面 E，此时，工艺面 E 也是定位基准，加工按粗 精基准选择先后进行。最后，按照工艺内容，设计工序所需夹具，通过六点定位 原理确定工件的位置，是用底板、键和定位块来限制工件的自由度，再选择合适 的压紧力防止工件移动。铣
2、加工时，还应增加对刀块、定位键和辅助支撑来帮助 加工，而在钻加工时，应增加钻套，钻模板来辅助加工。零件的图纸及加工工艺 分析是夹具设计的基本前提，工艺的优劣与夹具的设计密切相关。 关键词：工艺 夹具设计 定位 夹紧 Abstract The graduation design goal is to the processing technology and the writing of the parts processing for fixture design. First of all, parts material is cast iron, part of a bottom and
3、sides is design standards, the underside 14 x 125 tanks, and 54 x 125 slots, on the hole surface C have 13, the benchmark side threaded hole M10, the left arms have the hole hole 25. Second, according to parts analysis shows that the benchmark of parts should be the underside, 14 x 125 slots and 25
4、hole of axis line, the underside benchmark should be increased to face E processing technology, at this time, technology is also the locating datum plane E, processing according to roughing and basic selection has. Finally, according to the process content, design process required fixture, through t
5、he six positioning principle make work position, it is to use floor, key and the orientation block to limit the degrees of freedom, to 第 2 页 choose the right compaction force to prevent the move. Milling process, should also increase the knife block, positioning keys and auxiliary support to help pr
6、ocessing, and in the drilling process, should increase of drilling, drilling templates to assist processing. Parts of drawing and processing technology analysis is the basic premise of fixture design, process quality and fixture design closely related. Key words: process positioning clamping fixture design 第 3 页 目目 录录 摘 要 . 1 Abstract 1 目 录 . 3 第 1 章 绪论. 5 1.1 设计题目 . 5 1.1.1 设计的方向 6 1.1.2 设计的内容 6 第 2 章 机械加工工艺和夹具的概述 7 2.1 机械加工的工艺 . 7 2.1.1 工序的划分 7 2.1.2 基准的选择原则 . 7 2.1.3 机床的选择
