广西科技大学（筹）

数控加工工艺与编程 课程设计说明书

课题名称 CA10B解放牌汽车前刹车调整臂外壳

加工工艺设计及程序编制

学 院 机械工程学院

专 业 机械工程及自动化 班 级 机自Y093班 学 号 200900104038 姓 名 李珍宝 指导教师 唐清春

2012年 5 月 30

摘 要

机械加工工艺流程是工件或者零件制造加工的步骤，采用机械加工的方法，直接改变毛坯的形状、尺寸和表面质量等，使其成为零件的过程称为机械加工工艺过程。

本设计首先介绍了前刹车调整臂外壳的作用和工艺分析，其次确定毛坯尺寸，然后进行了工艺规程设计，最后进行夹具设计。此次设计是对前刹车调整臂外壳的加工工艺和夹具设计，其零件为铸件，具有体积小，零件结构简单的特点，由于面比孔易加工，在制定工艺规程时，就先加工面，再以面为基准来加工其它，其中各工序夹具都采用专用夹具，其机构设计简单，方便且能满足要求。

关键词: 前刹车调整臂外壳；工艺分析；工艺规程设计

Abstract

Machining process is a part or parts manufacturing and processing steps, mechanical processing methods, directly change the rough shape, size and surface quality, making it part of the process called machining process.

The design first introduced the Former brake slack adjusters shell role and process analysis, followed to determine the rough size, then the process planning, the final fixture design. The design is a Former brake slack adjusters shell processing and fixture design, the parts of casting, with small, simple structure, the characteristics of parts, ease of processing because surface than the hole in the development process of order, it faces the first processing , then the other side as a benchmark to process, in which the processes are using a dedicated jig fixture, their mechanical design is simple, convenient and can meet the requirements.

Keywords: Former brake slack adjusters shell; process analysis; process planning

目录

1. 设计任务及要求 ........................................................................................................... 1 2. 设计目的 ..................................................................................................................... 1 3. 零件的分析 .................................................................................................................. 1 3.1 零件的用途介绍 .................................................................................................... 1 3.2 零件的工艺分析 .................................................................................................... 2 4. 工艺规程设计 .............................................................................................................. 3 4.1 确定毛坯的制造形式 ............................................................................................. 3 4.2 基准的选择 ........................................................................................................... 3 4.3 拟定工艺路线 ....................................................................................................... 3

4.3.1 工艺路线方案一 ............................................................................................ 3 4.3.2 工艺路线方案二 ............................................................................................ 3 4.4 工艺路线的分析和比较 ......................................................................................... 4 4.5 确定最优工艺方案 ................................................................................................ 5 5. 机械加工余量及工序毛坯尺寸的确定 ........................................................................... 5 5.1 确定毛坯尺寸 ....................................................................................................... 5 5.2 确定公差............................................................................................................... 5 5.3 切削余量计算 ....................................................................................................... 5

5.3.1 余量分析计算 .............................................................................................. 5 5.3.2 φ62mm孔的铣削余量 .................................................................................. 7 5.3.3 5.3.4 5.3.5 5.3.6

φ12mm孔的铣削余量 .................................................................................. 7 φ13.8mm和φ13mm两通孔的端面的铣削余量............................................ 7 φ13.8mm和φ13mm孔的铣削余量 ............................................................. 8 键槽?26mm............................................................................................... 8

?0.28?0.146. 确定切削用量及基本工时 ............................................................................................. 8 6.1 工序I切削用量 ...................................................................................................... 8 6.2 工序II切削用量 ..................................................................................................... 9 6.3 工序III切削用量 .................................................................................................. 11 6.4 工序IV切削用量 .................................................................................................. 11 6.5 工序V切削用量 ................................................................................................... 11 6.6 工序VI切削用量 .................................................................................................. 12 6.7 工序XIII切削用量 ............................................................................................... 15 6.8 工序IX切削用量 .................................................................................................. 15 6.9 工序X切削用量 ................................................................................................... 15 6.10工序Ⅺ切削用量 ................................................................................................... 15 7. 夹具设计 ................................................................................................................... 17 7.1 概述 ..................................................................................................................... 17

7.1.1 保证加工精度.............................................................................................. 17 7.1.2 提高生产率 ................................................................................................. 17 7.1.3 扩大机床的使用范围 ................................................................................... 17 7.1.4 保证生产安全.............................................................................................. 17 7.2 机床夹具应满足的要求 ......................................................................................... 17

7.2.1 夹具的总体方案与生产纲领相适应 ................................................................ 17

7.2.2 安全方便、减轻劳动强度 .............................................................................. 17

7.2.3 排屑顺畅 ...................................................................................................... 17 7.2.4 有良好的强度、刚度及结构工艺性 ................................................................ 18 7.3 夹具的选定 .............................................................................................................. 18 7.4 夹具设计的有关计算 ................................................................................................ 18

7.4.1 定位基准的选择 ............................................................................................ 18

7.4.2 切削力及夹紧力计算 ..................................................................................... 18 7.4.3 定位误差分析 ............................................................................................... 18 7.2.1 夹具的总体方案与生产纲领相适应......................................................................... 18 8. 总结体会 ................................................................................................................... 19 9. 参考文献 ................................................................................................................... 21