摘要
此次毕业设计融入了本科期间学的一些重要理论知识，如机床的转速、进 给量以及加工余量和刀具等参数的选用，同时也注意到要考虑有关零件加工时 的表面精度和位置精度要求。
此次毕设包括了换挡拨叉零件的工艺编制、拨叉专用夹具的设计以及设计 说明书的撰写。
加工工艺和夹具设计是目前工厂生产过程中的重要流程，加工工艺包括机 械加工工艺流程、各工序的加工参数等内容，好的一部分，它是工艺装备 的重要组成部分，是除了机床以外最重要的工艺辅助装备。 关键词：拨叉 夹具设计 工艺路线
3.2.1 粗基准的选择 ...........................................4 3.2.2 精基准的选择 ...........................................4 3.3 制定工艺路线 ................................................5 3.4 确定工件的机械加工余量、各工序尺寸和毛坯尺寸 ................5 3.4.1 确定毛坯种类、加工余量和工序尺寸 .......................5 3.5 确定切削用量及基本工时 ......................................7 第 4 章 专用夹具设计 ...............................................21 4.1 问题的提出 .................................................21 4.2 工序 V 钻夹具设计 ...........................................21 4.2.1 工件定位面的选择 ......................................21 4.2.2 夹具定位元件选择 ......................................21 4.2.3 定位元件限制自由度分析 ................................21 4.2.4 计算切削力和夹紧力 ....................................22 4.2.5 定位误差分析 ..........................................23 4.2.6 零部件的设计与选用 ....................................24 4.3 工序 VII 铣夹具设计 .........................................25 4.3.1 工件定位基准的选择 ....................................25 4.3.2 计算切削力及夹紧力 ....................................25 4.3.3 定位误差分析 ..........................................26 4.3.4 定位键与对刀装置设计 ..................................28 致 谢 .............................................................30 参考文献 ...........................................................31
Key words：fork fixture design process route
目录
摘要 ................................................................I Abstract ...........................................................II 第 1 章 绪论 ........................................................1
I
Abstract
The graduation design into the undergraduate period to learn some important theoretical knowledge, such as machine speed, feed and processing margins and tooling and other parameters of the selection,but also noted that the parts to consider the surface accuracy and location accuracy requirements.
The complete set includes the shift fork parts of the preparation process, the design of the fork for the fixture and write the design manual.
Processing technology and fixture design is an important process in the factory production process. The processing technology includes the machining process and the processing parameters of each process. The good machining process can simplify the processing flow and improve the quality of the workpiece. Fixture design is part of the process, it is an important part of process equipment, in addition to the machine tool is the most important auxiliary equipment.
1.1 引言 ........................................................1 1.2 本课题背景及发展趋势 ........................................2 第 2 章 零件的分析 ..................................................3 2.1 零件的作用 ..................................................3 2.2 零件的工艺分析 ..............................................3 第 3 章 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 ..................................................4