汽車(chē)車(chē)身覆蓋件逆向工程技術(shù)

機(jī)械論文編號(hào):JX860  論文字?jǐn)?shù):15231.頁(yè)數(shù):37   附圖

 目  錄
中文摘要 i
英文摘要 ii
目錄 iii
第一章     緒論 1
1.1   本課題研究背景 1
1.2   逆向工程介紹 2
1.3   逆向工程發(fā)展?fàn)顩r 3
第二章    逆向工程開(kāi)發(fā)與設(shè)計(jì) 4
2.1   逆向工程四個(gè)過(guò)程 4
2.2   逆向工程常用軟件 4
2.3   逆向工程中常用的測(cè)量方法 5
2.4   測(cè)量機(jī)蓋板點(diǎn)云數(shù)據(jù) 7
2.5   IMAGEWARE 調(diào)點(diǎn)云 7
第三章     CATIA V5 軟件介紹 8
      3.1   CATIA V5 簡(jiǎn)單介紹 8
      3.2   CATIA V5基礎(chǔ) 8
      3.3   零件設(shè)計(jì) 10
      3.4   創(chuàng)成式曲面設(shè)計(jì) 11
第四章     三維建模 13
      4.1   點(diǎn)云 13
      4.2   坐標(biāo)系的建立 16
       4.3   三維建模 19
         4.3.1  曲線擬合造型 19
         4.3.2  曲線插值過(guò)程 21
      4.4   建立外板的曲面  22
       4.5   曲面直接擬合 25
      4.6   曲面重構(gòu)的特點(diǎn) 30
       4.7   三維出模 31
第五章    總結(jié)  32
致謝 33
參考文獻(xiàn) 34
 三維圖（另附）

摘要
    在20世紀(jì)90年代，國(guó)際汽車(chē)界興起一種逆向工程的汽車(chē)產(chǎn)品開(kāi)發(fā)新方式。經(jīng)過(guò)幾年的發(fā)展，積累了很多經(jīng)驗(yàn)，取得巨大進(jìn)步，可以說(shuō)已成為現(xiàn)代汽車(chē)產(chǎn)品開(kāi)發(fā)的主流形式。
 本文首先介紹下逆向的四個(gè)過(guò)程和所用的CATIA軟件，對(duì)CATIA軟件的兩個(gè)重要模塊有所了解。以車(chē)前蓋板逆向工程設(shè)計(jì)為例主要以CATIA軟件為平臺(tái)建模的實(shí)例來(lái)說(shuō)明逆向的整個(gè)過(guò)程。用三維測(cè)量機(jī)測(cè)得三維數(shù)據(jù)，形成點(diǎn)云并網(wǎng)格化。根據(jù)網(wǎng)格后的大面或局部特征建立適當(dāng)?shù)娜�維坐標(biāo)，在快速成形模塊，拉成大的面。選取點(diǎn)云的邊線，拉升相交面，相交減，形成外輪廓線。用這種方法完成一個(gè)車(chē)前蓋板的三維模型。
    實(shí)施逆向工程的目的是為了更好地實(shí)現(xiàn)汽車(chē)產(chǎn)品設(shè)計(jì)的并行工程，使產(chǎn)品設(shè)計(jì)與其它相關(guān)過(guò)程實(shí)行同步作業(yè)，并使之優(yōu)化，大大提高產(chǎn)品設(shè)計(jì)的一次成功率，從而縮短周期，降低成本，減少風(fēng)險(xiǎn)，提高質(zhì)量，增強(qiáng)企業(yè)競(jìng)爭(zhēng)力。
 逆向工程不僅僅是反制的過(guò)程，更是一個(gè)學(xué)習(xí)與交流的平臺(tái)。中國(guó)的汽車(chē)制造業(yè)起步相對(duì)來(lái)說(shuō)比較晚，與發(fā)達(dá)的國(guó)家比起來(lái)有一點(diǎn)的差距，根據(jù)實(shí)際情況說(shuō)明逆向工程對(duì)我國(guó)汽車(chē)設(shè)計(jì)方向有指導(dǎo)性的意義。
 
關(guān)鍵詞：逆向工程  車(chē)前蓋板  點(diǎn)云采集   三維建模
                         
 
 
 
　 Auto body reverse engineering
 Abstract
 In the 1990s, the international automobile industry develop a new way which is named reverse engineering of automotive products . After several years of development,accumulated a lot of experience and achieved tremendous progress, it can be said the method has become the mainstream form of product development.
 This article first introduces the four process of reverse and the use of CATIA software which has two important models. As an example,the front cover of reverse engineering design,it is used to illustrate reverse during the whole process.We use three-dimensional measuring machines to get the data. And then it is form of cloud formation and grid.According to the grid and features，we can establish an appropriate three-dimensional coordinates and form a big surface. Select the point cloud the lines and then elevate intersection face.After the intersection,it forms the outline of the product. In this way, the establishment of three-dimensional model is founded.
    The implementation of reverse engineering is designed to better concurrent engineering .In order to enhance the success rate and reduce the cost, you should keep all the steps at the same time.If you put it in practice, you can shorten the cycle of product and increase the competitiveness of enterprises.
 Reverse engineering is not only get the objects,but also it is a learning and communication platform. Automobile manufacturing industry in China starts relatively lately compared with the developed countries. According to the actual situation , reverse engineering in the design leads the direction.
Keywords:   Reverse engineering  The front cover of car   Point acquisition   Three-dimensional modeling