170左曲轴箱加工工艺编制及夹具设计

南京理工大学泰州科技学院

毕业设计（论文）

学院(系)： 专 业： 学 生 姓 名： 设计(论文)题目：

起 迄 日 期: 设计(论文)地点: 指 导 教 师: 专业负责人:

机械工程学院 机械工程及自动化

170左曲轴箱加工工艺编制

及夹具设计

2013年02月24日 ~ 05月25日

南京理工大学泰州科技学院

日期: 2013年 月 日

摘 要

本文是对170左曲轴箱零件加工应用及加工的工艺性分析，主要包括对零件图的分析、毛坯的选择、零件的装夹、工艺路线的制订、刀具的选择、切削用量的确定、加工工艺文件的填写。选择正确的加工方法，设计合理的加工工艺过程。此外还对170左曲轴箱零件的工序的加工设计了专用夹具.

本文主要对170左曲轴箱零件一个侧面上的孔尽可能多地一次加工到位，设计了钻底孔专用夹具设计。采用一面二销定位，手工螺旋夹紧方式，经过验证，稳定可靠，可以应用实践当中。

关键词：加工工艺，加工方法，工艺文件，夹具

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Abstract

This article is about the Pump body parts processing application and processing technology and analysis, including the parts of the plan, the choice of blank, the clamping, the craft route making, tool selection, the determination of cutting conditions, processing documents. Choose the correct processing methods, design the reasonable process. In addition to the stuffing box cover part two process designing special fixture.

This paper mainly on one side and 170 holes on the left crankcase parts as much as possible a process in place, design the special fixture design of drill hole. The two side pin positioning, manual screw clamping way, after verification, stable and reliable, and can be applied in practice.

Key words: processing technology, processing method, process documentation, fixture

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目 录

摘 要 ....................................................................................................................................... II Abstract..................................................................................................................................... III 目 录 ...................................................................................................................................... IV 1 绪论 ...................................................................................................................................... 1

1.1机械加工工艺概述 ...................................................................................................... 1 1.2机械加工工艺流程 ...................................................................................................... 1 1.3夹具概述 ...................................................................................................................... 2 1.4机床夹具的功能 .......................................................................................................... 2 1.5机床夹具的发展趋势 .................................................................................................. 3

1.5.1机床夹具的现状 ............................................................................................... 3 1.5.2现代机床夹具的发展方向 ............................................................................... 3

2 零件的分析 ............................................................................................................................ 5

2.1 零件的作用 ................................................................................................................. 5 2.2 零件的工艺分析 ......................................................................................................... 5 3 工艺规程设计 ........................................................................................................................ 6

3.1 毛坯的制造形式 ......................................................................................................... 6 3.2 基准面的选择 ............................................................................................................. 6

3.2.1粗基准的选择 ................................................................................................... 6 3.2.2 精基准的选择 .................................................................................................. 6 3.3 制订工艺路线 ............................................................................................................. 6

3.3.1 工艺线路方案一 .............................................................................................. 7 3.3.2工艺路线方案二 ............................................................................................... 7 3.3.3 工艺方案的比较与分析 .................................................................................. 7 3.4 机械加工余量、工序尺寸及毛坯尺寸的确定 ......................................................... 8 3.5 确定切削用量及基本工时 ......................................................................................... 9

3.5.1 工序Ⅰ：铣削底面 .......................................................................................... 9 3.5.2工序ⅠⅠ：铣顶面 ......................................................................................... 10 3.5.3 工序Ⅴ：精铣E、F端面 ............................................................................. 10

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3.5.4工序Ⅵ：精、粗镗φ62、φ46、φ51.8、φ45mm孔 ............................... 11 3.5.5 工序Ⅳ 钻E、 F面孔 ............................................................................... 12

4 钻孔夹具设计 ...................................................................................................................... 15

4.1机床夹具的分类 ........................................................................................................ 15 4.2工件的装夹方法 ........................................................................................................ 15 4.3工件在夹具中的定位 ................................................................................................ 15 4.4定位误差的分析 ........................................................................................................ 17 4.5夹紧装置的组成 ........................................................................................................ 17 4.6 问题的指出 ............................................................................................................... 18 4.7 定位误差的分析 ....................................................................................................... 25 4.8 定位元件设计 ........................................................................................................... 25 4.9定位误差分析 ............................................................................................................ 27 4.10 钻套、衬套、钻模板及夹具体设计 ..................................................................... 27 4.11 夹具精度分析 ......................................................................................................... 28 4.12夹具设计及操作的简要说明 .................................................................................. 30 总 结 ........................................................................................................................................ 30 参 考 文 献 ............................................................................................................................ 32 致 谢 ........................................................................................................................................ 33

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