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学位论文

摘 要

毕业设计的课题基本分为三大类，即工艺工装设计类、组合机床设计类和计算机课题类。本课题所涉及的是第一类，设计任务为汽车后桥壳体的工艺工装设计，在壳体内部装有主传动器、差速器、半轴等传动机构。

壳体起保证和支撑的作用，其主要加工表面为端面外圆、法兰平面、弹簧座平面、以及内孔等。

本次设计主要包括工艺规程、夹具、刀具和量具的设计。此次设计共分三个阶段，即：（1）毕业实习阶段（2）课题设计阶段（3）考核答辩阶段。结合本次设计零件的特点，在设计中完成工艺规程一套，夹具两套：（1）铣床夹具（2）钻床夹具，其中，前者为手动夹紧。另外还据任务书分别设计刀具——铣刀一把和量具——单头双极限卡规一套，共完成图纸近5张，基本完成老师所交给的任务。

关键词：汽车后桥；工艺分析；设计任务

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学位论文

ABSTRACT

The subject of the graduation project is divided into three big classes,namely the frock designing type of craft ,making up the designingtype of lathe and comper subjects basically.What this subject involved is the first kind,designing the task for the rear axle of automobile,the craft frock of the shell is designed.Equipped with the organizations of the transmission,such as main hammer mechanism actuator,differential mechanism,semi-axis,ect,within the shell.The shell plays a role in guatanteeing and support,it processes flange,spring seat plane,and interior hole round for outside of the terminal surface of surface,ect,mainly.

This design includes the design of rules of craft,jig,cutter and measuring tool mainly.This design divides three stages altogether,namely:(1)Graduation field work stage(2)Ddeign phase of subject(3)Examine the stage of replying.Combine this charateristic of designing the part,finisshes one set of rules of craft in the design,two sets of jigs:(1)Jig of the milling machine(2)The jig of the drilling machine,among them,the former,in order to clamp manually.Still design the cutter sepatately according to the task book in addition—One milling cutter is with measuring,finish drawing amount nearlu 5 altogether,finish the task that a teacher assigns basically.

Key word:The rear axle of automobile；the crafu analuses；designs the task

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学位论文

目录

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

1.1 我国汽车后桥制造业的现状及其发展趋势 ............................................................ 1 1.2 汽车后桥壳体的构造 ................................................................................................ 1 1.3 汽车后桥壳体的性能要求 ........................................................................................ 1 2 零件的分析 .......................................................................................................................... 3

2.1 零件的作用 ................................................................................................................ 3 2.2 零件的工艺分析 ........................................................................................................ 3 2.3 生产类型的确定 ........................................................................................................ 4 2.4 确定毛坯的制造形式 ................................................................................................ 4 2.5 基面的选择 ................................................................................................................ 4 3 械加工工艺路线 .................................................................................................................. 6

3.1 工艺方案 .................................................................................................................... 6 3.2 工艺方案比较分析 .................................................................................................... 7 3.3 加工阶段的划分和检验工序的安排 ........................................................................ 7 4 加工余量、工序、毛坯尺寸的确定 .................................................................................. 9 5 工时定额 ............................................................................................................................ 10

5.1工序六的工时定额 ..................................................................................................... 10 5.2工序十三的工序定额 ................................................................................................. 11 6 夹具设计 ............................................................................................................................ 12

6.1 铣床夹具设计 .......................................................................................................... 12

6.1.1 工件的加工工艺分析 .................................................................................... 12 6.1.2 定方案，设计定位元件 ................................................................................ 12 6.1.3 确定夹紧方式和设计夹紧结构 .................................................................... 13 6.1.4 定位误差的分析 ............................................................................................ 14 6.1.5 夹紧元件的强度校核 .................................................................................... 14 6.1.6 夹具体的设计 ................................................................................................ 15 6.1.7 夹具体设计及其操作的简要说明 ................................................................ 15 6.2 钻床夹具的设计 ...................................................................................................... 16

6.2.1 定位基准的选择 ............................................................................................ 16 6.2.2 夹紧力的确定 ................................................................................................ 16 6.2.3 钻削力的计算 ................................................................................................ 16 6.2.4 动力源设计 .................................................................................................... 17 6.2.5 夹具体的设计 ................................................................................................ 18 6.2.6 夹具设计及操作简要说明 ............................................................................ 19

7 CAD绘图简介 ................................................................................................................... 20 8 量具设计 ............................................................................................................................ 21 9 刀具设计 ............................................................................................................................ 24 结 论 ........................................................................................................................................ 26 致 谢 ........................................................................................................................................ 27 参考文献 .................................................................................................................................. 28

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