11届毕业设计范文

青岛理工大学

毕 业 设 计（论 文）

题目：变速拨叉零件的机械加工工艺及工艺装备

学生姓名： 张小明 学生学号： 200800000 院系名称： 机电工程系 专业班级： 机电一体化 指导教师： 孔令辉

2011年 06 月 16 日

青岛理工大学毕业设计

摘 要

本论文设计的是变速拨叉的加工工序、设计方案、计算过程以及钻孔的夹具设计。拨叉表面加工方法的选择、加工顺序的安排、工序集中与分散的处理、加工阶段的划分、机床和工艺装备的选择、加工余量与工序尺寸及公差的确定等都是编制工艺规程的主要问题。而夹具设计所面临的是设计方案的确定、定位元件的选择、定位误差的分析与计算、夹紧力的计算、夹具体毛坯结构及夹具元件配合的确定。还有拨叉毛坯图、零件图和夹具装配图的绘制，如何保证用拨叉的技术条件是加工过程最为重要的问题，而夹具也起着至关重要的作用。

拨叉的合理结构设计、加工工艺性设计，保证拨叉的加工质量，对提高生产效率有着重要意义，它是保证产品质量的关键所在。通过对拨叉加工过程的设计，可以发现一个产品的设计需要各个加工过程很好的配合才能成功。 通过课程设计达到以下目的：

1、能熟练的运用机械制造工艺学的基本理论和夹具设计原理的知识，正确地解决一个零件在加工中的定位，夹紧以及合理制订工艺规程等问题的方法，培养学生分析问题和解决问题的能力。

2、通过对零件某道工序的夹具设计，学会工艺装备设计的一般方法。通过学生亲手设计夹具的训练，提高结构设计的能力。

3、课程设计过程也是理论联系实际的过程，并学会使用手册、查询相关资料等，增强学生解决工程实际问题的独立工作能力。 关键词：拨叉，工艺，夹具，夹紧，定位

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青岛理工大学毕业设计

ABSTRACT

In this paper, the design of the fork processing speed, design, calculation and design of drilling jig. Fork the surface of the choice of processing methods, processing sequence of the arrangement, process centralization and decentralization of treatment, the division stage of processing, machine tools and process equipment selection, allowance and processes determine the size and tolerance of the preparation process are the main point of order problem. Fixture Design and facing the program is designed to identify, locate component selection, positioning errors of analysis and calculation, the calculation of clamping force, the specific folder structure and the rough with the determination of fixture elements. There are fork blank map, fixture assembly parts diagram and mapping how to ensure the technical conditions fork is the most important process, and fixture also plays a vital role.

Fork reasonable structural design, design process to ensure quality processing fork, to improve the productivity of great significance, it is to ensure that the key to product quality. Fork through the design process can be found in a product design process requires a good co-ordination to succeed.

Through the curriculum design to achieve the following objectives:

1, can skillfully use Machinery Manufacturing Technology of the basic theory and knowledge of fixture design principles, the correct solution to apart in the process of positioning, clamping and reasonable development of process planning and other problems, students analyze and solve problems Ability.

2, part of a road through the fixture design process, learn the generalprocess and equipment design methods.Personally designed by the students training in the fixture to improve the structural design capabilities.

3, the curriculum design process is the process of theory with practice,and learn to usethe manual, check-related information, etc., to enhance students to solve engineering problems Ability to work independently.

KEY WORDS: fork, technology, fixture, clamping, positioning

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青岛理工大学毕业设计

目录

摘 要 ................................................................ I ABSTRACT ............................................................ II 目录 ............................................................... III 第1章 零件的分析 .................................................... 2 1.1零件的作用 ...................................................... 2 1.2零件的工艺分析 .................................................. 2 第2章 工艺规程设计 .................................................. 4 2.1确定毛坯的制造形式 .............................................. 5 2.2 基面的选择 ...................................................... 8 2.3制定工艺路线 .................................................... 9 2.4机械加工余量、工序尺寸及毛坯尺寸的确定 ......................... 12 2.5确立切削用量及基本工时 ......................................... 14 2.5.1工序1：粗镗，半精镗φ55孔 ................................ 14 2.5.2工序2：铣断 ............................................... 14 2.5.3工序3：钻、扩、粗铰、精铰Φ25孔 .......................... 15 2.5.4工序4：粗铣，精铣φ55孔上、下端面 ........................ 18 2.5.5工序5：铣φ40外圆斜面 .................................... 19 2.5.6工序6：粗铣、精铣尺寸为40的外侧面 ........................ 20 2.5.7工序7：铣16×8槽 ......................................... 21 第3章 夹具设计 ..................................................... 22 3.1提出问题 ....................................................... 21 3.2设计思想 ....................................................... 21 3.3夹具设计 ....................................................... 22 总 结 ............................................................... 25 参考文献 ............................................................ 26 致谢 ................................................................ 27 附录1 ............................................................... 28 附录2 ............................................................... 33

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