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1、摘 要 本文介绍了吊钩的逆向造型过程，通过激光扫描仪的非接触测量获取零件表面的云状数据，并由测量数据逐步生成扫描曲线，型值曲线，通过曲面拟合形成光滑自由曲面，最终实现零件的重构。 逆向工程的概念：逆向工程（Reverse Engineering,RE）是对产品设计过程的一种描述。在工程技术人员的一般概念中，产品设计过程是一个从无到有的过程，即设计人员首先在大脑中构思产品的外形、性能和大致的技术参数等，然后通过绘制图纸建立产品的三维数字化模型，最终将这个模型转入到制造流程中，完成产品的整个设计制造周期。这样的产品设计过程我们称为“正向设计”过程。逆向工程产品设计可以认为是一个“从有到无”的过程。
2、简单地说，逆向工程产品设计就是根据已经存在的产品模型，反向推出产品设计数据（包括设计图纸或数字模型）的过程。从这个意义上说，逆向工程在工业设计中的应用已经很久了。早期的船舶工业中常用的船体放样设计就是逆向工程的很好实例。随着计算机技术在制造领域的广泛应用，特别是数字化测量技术的迅猛发展，基于测量数据的产品造型技术成为逆向工程技术关注的主要对象。通过数字化测量设备（如坐标测量机、激光测量设备等）获取的物体表面的空间数据，需要利用逆向工程技术建立产品的三维模型，进而利用CAM系统完成产品的制造。因此，逆向工程技术可以认为是将产品样件转化为三维模型的相关数字化技术和几何建模技术的总称。逆向工程的实施
3、过程是多领域、多学科的协同过程。逆向工程的整个实施过程包括了从测量数据采集、处理到常规CAD/CAM系统，最终与品数据管理系统（PDM系统）融合的过程。关键词：逆向工程，点云，CATIA软件，激光测量，曲面建模SUMMARYThe paper introduces the digitizing reconstruction of diesel engine modeling. Surface cloud data comes from laser scanner. The scan curve , the style curve are created from above measuring
4、 data. , And then the surface is fitted from the style curve. At last ,the part modeling can be reconstructed. The concept of the contrary engineering：The contrary engineering( Reverse Engineering, RE) designs the process to the product a kind of to describe. In the technical personnels general conc
5、ept in engineering， product design process is a process from having no to having technique parameter etc. that shape, function, then design the personnel to conceive outline the product in brain first with mostly, then pass to draw the diagram paper establish the product of three the arithmetic figu
6、re turn the model, end turn into this model to make the process inside, whole design manufacturing period that complete the product. Such product designs the process we call face the design process. The contrary engineering product design can think that is a process for from having no. Say in brief,
7、 contrary engineering product design be according to already the product model that exists, reversal the process that announce new products design the data( include to design diagram paper or arithmetic figure models). Say from this meaning, contrary engineering is in industry design of the applicat
8、ion was already and for a long time. The in common use ship in inside in industry in ships of the earlier period puts kind design be very solid example in contrary engineering. Along with the extensive application of calculator technique at make realm, especially the arithmetic figure turns the tech
9、nical and fast fierce development in diagraph, according to the product shape technique of the diagraph data becomes the main object that contrary engineering technique payattention to. The arithmetic figure that pass the diagraph equipments( if sit the mark measure the machine, laser measures equip
10、ments etc.) turns the superficial space in object data obtains, needing the contrary engineering in exploitation technique establish the product of three the model , then make use of the manufacturing that the system of CAM complete product. Therefore, the contrary engineering technique can think is
11、 product kind a conversion is three the related arithmetic figure of the model turn the technique with several set up why the technical gross in mold call. The contrary engineering puts into practice the process is many realms, many course is in conjunction with the process. Whole a process for putt
12、ing process into practice including from the diagraph data collect, handles normal regulations the system of CAD/CAM, endly with product data management system( the system of PDM) fusion of the contrary engineering.KEY WORDS: Contrary engineering, order cloud, the software of CATIA, the laser measur
13、es, the curved face sets up the mold 目 录前 言5第一章 逆向工程的概述61.1 逆向工程的定义61.2 逆向工程的应用61.3 逆向工程系统组成71.4 CAD模型重建技术 71.5 曲面造型技术 9第二章 逆向工程软件CATIA 1921 概述192.2 CATIA 软件 202.3 点处理过程202.4曲线创造过程242.5. 曲面创建过程26第三章基于逆向工程的吊钩的造型273.1 曲面云状数据的获取283.2 曲面的划分及特征线的提取 283.3 曲面重构29附图33结论 42参考文献 42致谢43前 言 逆向工程技术（Reverse Engineering ,RE ）,也称反求工程、反向工程等，它的思想最初是来自从油泥模型到产品实物的设计过程，随后发展形成一项以先进产品、设备的实物、样件、软件（包括图样、程序、技术文件等）或影像（图像、照片等）作为研究对象，应用现代设计方法学、生产工程学、材料学和有关专业知识进行系统分析和研究、探索掌握其关键技术，进而开发出同类的更为先进的产品的技术。作为消化吸收先进技术的一种手段，在21世纪90年代初，逆向工程技术开始引起各国工业界和学术界的高度重视，特别是随着现代计算机技术及测试技术的发展，利用CAD/CAM技术、先进制造技术
