catia汽车毕业设计
【篇一：汽车逆向设计毕业设计】
摘 要
本文主要介绍了基于catia软件将汽车发动机盖板数据点云通过逆向工程技术设计成零件实体的过程，以及其数控模拟加工。在设计过程中涉及到点云整理、数字编辑、自由曲面造型、快速曲面造型等技术。在建模过程中，遇到桥接出现错误、拼接无法完成等问题，都得到了较好的解决。
在具体逆向设计中，为了建好曲面模型，运用了不同的方案，经过多次的失败和改正后，最终获得了较好的曲面模型。
关键词：逆向工程；引擎盖；catia；曲面造型；
abstract
the article is about basing on catia software to design the part entity with point cloud
of automobile engine hood data by reverse engineering and its numerical control simulation processing. technologies such as cloud arranging, the digitized shape editor, the free curved surface model and quick surface reconstruction are being used in the process of designing. in the process of building model, the problem of blend-surface error and join surface has been resolved ，which has been resolved on higher level.
in the specific reverse design, i used different plans in order to build good surface model and got good surface model in the end ,after facing many times of failure and correcting them.
key words ： reverse engineering；hood; catia; surface modeling;
目 录
摘 要 ..........................................................................................................................................................
i abstract ......................................................................................................................................................ii
1 逆向工程概述 ....................................................................................................................................... 1
1.1 逆向工程定义及其应用 ........................................................................................................... 1
1.2 逆向工程系统 ........................................................................................................................... 2
1.2.1 产品实物几何外形的数字化系统 ................................................................................. 2
2 catia v5介绍 ...................................................................................................................................... 4
2.1 catia 在制造业的应用.......................................................................................................... 4
2.2 catia v5概貌 ......................................................................................................................... 4
3 catia逆向工程建模基础 ................................................................................................................ 13
3.1 catia曲面的逆向重构 ........................................................................................................ 13
3.1.1由曲线构造曲面的方法 ................................................................................................ 13
3.1.2 由曲面派生曲面的方法 ............................................................................................... 14
3.3 catia逆向工程的特点 ........................................................................................................ 16
3.4 catia用于逆向工程的主要模块功能简介 ........................................................................ 16
3.4.1 dse数字编辑器模块 .................................................................................................. 16
3.4.2 qsr快速曲面重构模块 .............................................................................................. 16
3.4.3 gsd通用曲面造型模块 .............................................................................................. 17
4 汽车发动机盖板逆向数字建模过程 ................................................................................................. 19
4.1发动机盖板点云的处理 ........................................................................................................... 19
4.2（方法一）发动机盖板外形曲面的制作 ................................................................................ 24
4.3（方法一）发动机盖板孔的制作 ............................................................................................ 34
4.4 （方法一）对称曲面 .............................................................................................................. 39
汽车发动机盖 4.5（方法一）实体的生成 ............................................................................................................ 41
4.6 (方法二）点云的再处理 .......................................................................................................... 42
4.7（方法二）利用强力匹配生成右半面 .................................................................................... 43
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