精选资料
减速箱体机械加工工艺及夹具设计
学生姓名： 学生学号：
院（系）： 机电工程学院 年级专业：2004级机械设计制造及其自动化 指导教师：
二〇〇八年六月
可修改编辑
精选资料
摘 要
箱体零件是一种典型零件，其加工工艺规程和工装设计具有典型性。该箱体零件结构复杂，零件毛坯采用铸造成形。在加工过程中，采用先面后孔的加工路线，以保证工件的定位基准统一、准确。为了消除切削力、夹紧力、切削热和因粗加工所造成的内应力对加工精度的影响，整个工艺过程分为粗、精两个阶段。通过被加工零件的分析完成了机械加工工艺的设计及各加工工序机动时间的计算。根据箱体零件的结构及其功能，运用定位夹紧的知识完成了夹具设计。
关键词 箱体，工艺，夹具
可修改编辑
精选资料
ABSTRACT
This box machine element is typical, the manufacturing process and tooling design of it is typical.The structure of this box machine element is complicated, the machine element’s blank adopt casting shape. In the process of
manufacture, in order to ensure th -e location datum accurate and unity, I adopt the manufacturing line from face to hole.In order to clear away the influence for machining accurate of internal stress, cutting force, clamping force, heat in cutting from coarse manufacturing, the whole manufacturing pro -cess is made of coarse and accurate manufacturing. Parts were processed through the a -nalysis of the complete machining process design and the manufacturing processes for mobile time calculations. According to the box components and the function and structu -re, the use of the knowledge positioning clamp completed the fixture design.
Key words Box machine，Processing，Jig
可修改编辑
精选资料
目 录
摘 要 .............................................................................................................. I ABSTRACT ..................................................................................................... II
1 绪论 ........................................................................................................... 1
1.1 课题背景 ............................................................................................... 1 1.2 制订工艺规程的意义与作用及其基本要求 ..................................................... 1 1.3 夹具的设计 ............................................................................................ 1
2 零件的分析 ................................................................................................ 2
2.1 箱体零件的功用和结构特点 ....................................................................... 2 2.2 箱体零件图样分析 ................................................................................... 2 2.3 箱体零件工艺分析 ................................................................................... 3 2.4 箱体零件的主要技术要求 .......................................................................... 4 2.5 主要设计内容 ......................................................................................... 5
3 工艺规程设计 ............................................................................................. 7
3.1 箱体的材料及毛坯 ................................................................................... 7 3.2 减速箱箱体加工的主要问题和加工工艺过程设计所应采取的相应措施 ................. 8 3.3 减速箱体加工定位基准的选择 .................................................................... 8 3.4 制定箱体的工艺路线 ................................................................................ 9 3.5 机械加工余量、工序尺寸及毛坯尺寸的确定 ................................................. 13 3.6 确定切削用量及基本工时（机动时间） ....................................................... 15 3.7 时间定额计算及生产安排 ......................................................................... 29
4 夹具设计 .................................................................................................. 36
4.1 镗床夹具设计 ........................................................................................ 36
4.1.1 工件加工工艺分析 .......................................................................... 36 4.1.2 定位方案及定位元件设计 ................................................................. 36 4.1.3 夹紧方案及夹紧元件设计 ................................................................. 36 4.1.4 镗杆的直径与长度 .......................................................................... 37 4.1.5 夹具体的设计 ................................................................................ 37 4.1.6 镗套的设计 ................................................................................... 37 4.1.7切削力及夹紧力计算 ....................................................................... 39 4.1.8 夹具精度分析计算 .......................................................................... 41
可修改编辑
精选资料
4.1.9 镗孔夹具的装配说明 ....................................................................... 42 4.2 钻床夹具设计 ........................................................................................ 43
4.2.1 工件结构特点分析 .......................................................................... 43 4.2.2 工件定位方案和定位元件的设计 ........................................................ 43 4.2.3 夹紧方案和夹紧元件的设计 .............................................................. 43 4.2.4 夹具体的设计 ................................................................................ 44 4.2.5 钻模板的设计 ................................................................................ 44 4.2.6 钻套的选择与设计 .......................................................................... 45 4.2.7 切削力及夹紧计算 .......................................................................... 46 4.2.8 夹具精度分析计算 .......................................................................... 47 4.2.9 钻床夹具的装配说明 ....................................................................... 49
结 论 ........................................................................................................... 50 参 考 文 献 .................................................................................................. 52 致 谢 ........................................................................................................... 53
可修改编辑
减速箱体机械加工工艺及夹具设计说明书
