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青岛理工大学毕业设计

摘 要

论文的题目是发动机箱体的机械加工工艺规程和专用夹具设计。发动机箱体是机器的基本零件，它将机器和发动机中的轴、套、齿轮等有关零件连接成为一个整体，并使之保证正确的位置以传递转矩或改变转速来完成规定的运动。发动机箱体的加工质量直接影响机器的性能、精度和寿命。

本设计说明书是根据机械制造工艺专业教学委员会所制定的教学计划和教学大纲，结合所学专业的理论和实践知识，编写设计处一套机械加工工艺规程和工装夹具。此设计有工作量大、专业知识范围广、要求高等特点，不同于前面所做的课程设计。对我们毕业生来讲，是对我们所学专业知识的一次重大考验，也是对我们参加工作之前的很好的历练。既提高了我们的专业要求，又培养了我们的实际设计意识。

说明书对零件的功用分析、零件的加工工艺过程、夹具工艺设计作了比较系统、完整的分析和论证。对工艺规程的设计作了详细的说明，并制定了合理的加工工艺路线。对关键工序的加工余量、工序尺寸、工序公差、切削用量进行了设计分析，保证整个工艺过程的完整。最后，对夹具精度也进行了校核计算。

关键词：发动机箱体，机械加工工艺，夹具，工序，加工余量

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青岛理工大学毕业设计

Abstract

The topic of thesis is the design of machining technics regulatious and appropriative clamp of the box body of engine .The box of engine is the basic spare of machine,it conecs the staik,set,wheel gear…etc of engine to the whole.And accurate position to transfer torque or complete prescriptive movement.The machining quality of the box body of engine will influence the performance,precision an life of machine.

According to the plan and didactical brief made by machine manufacturing craft profession committee,this design have mainly compiled and designed teachining technics regulations and appropriative clamp using professional theory and practical knowledge.This design is not only a great chanllenge,but also a good exercise for our graduate.It has enhanced our lever of speciality,at the same time,it also has cultived our team sprint.

The design mainly introduces the spare parts craft process,tongs technological design to make comparison system,analysis and argumen integrity.Design craft regulations to make expation,and establishment reasonable of process craft route.In this design,I have analysed and calculated some key working proces,which include the remaining quantity of process,the measure of working procedure procedure the tolerance of working procedure techics cards.Whatmore in the end ,I have designed a appropriative clamp and proof-tested its precision to ensure the quality of workpiece.

Key words: machining quality， the techics of machining， clamp， working procedure

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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 绪论 ................................................................................................. 1

1.1 课题研究的意义及现状 ........................................................................................... 1

1.1.1 发动机的工作原理 ............................................................................................ 1 1.1.2 发动机的结构 .................................................................................................... 2 1.1.2 课题研究的现状及展望 .................................................................................... 4 1.2 论文主要研究内容 ................................................................................................... 5

第2章 发动机箱体工艺设计 ..................................................................... 6

2.1箱体的分析 .............................................................................................................. 6

2.1.1箱体的功用分析 ............................................................................................... 6 2.1.2计算生产纲领，确定生产类型 ...................................................................... 7 2.1.3箱体结构和功用的分析 .................................................................................. 7 2.1.4箱体的技术分析 ............................................................................................... 9 2.1.5箱体的材料分析 ............................................................................................. 10 2.2发动机箱体毛坯的设计 ........................................................................................ 13 2.2.1确定毛坯种类及加工方法的选择 ................................................................... 13 2.2.2毛坯的工艺分析及要求 ................................................................................ 15 2.2.3毛坯余量和公差的确定 ................................................................................ 16 2.3工艺路线设计.......................................................................................................... 18 2.3.1零件图的工艺分析 ........................................................................................... 18 2.3.2加工方法的选择 ............................................................................................... 21 2.3.3箱体的材料及热处理 ....................................................................................... 22 2.3.4阶段的划分 ....................................................................................................... 22 2.3.5工序的集中与分散 ........................................................................................... 23 2.3.6基准的选择 ....................................................................................................... 24 2.3.7 拟定发动机箱体的工艺路线 ....................................................................... 27 2.4 加工设备及工艺装备的选择 .............................................................................. 28 2.5 加工工序设计 ......................................................................................................... 30

第3章 钻床专用夹具设计 ....................................................................... 38

3.1问题的提出 .............................................................................................................. 38

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