论文标题:面向装配的CAD建模技术在覆盖件设计中的研究与实践
Research and Practice on Assembly-oriented CAD Modeling Technology of Panels
论文作者 王巍
论文导师 郭钢,论文学位 硕士,论文专业 机械制造及其自动化
论文单位 重庆大学,点击次数 485,论文页数 81页File Size5165k
2003-05-10论文网 http://www.lw23.com/lunwen_365802/ 数字样机;覆盖件;装配建模;曲面
Digital Mock-up;Panels;Assembly modeling;Surface
进入二十一世纪以来，随着以计算机信息技术为基础的高新技术的迅猛发展，传统的制造业已经进入了一个新的发展领域。数字样机技术作为现代化的产品设计方法，已经越来越广泛地在制造业领域得到了应用。在利用数字样机技术进行产品开发的过程中，面向装配的CAD建模技术是重要的实现手段。本文针对覆盖件产品的开发特点，对面向装配的CAD建模理论和方法进行了深入研究。对面向装配的设计的原理和方法进行了研究。阐述了面向装配的设计方法的运行模式和体系结构；详细探讨了装配建模的主要内容，分析了装配模型的装配关系、装配层次关系以及装配约束，对装配模型的信息组成进行了介绍，提出了自下向上的装配建模方法和自顶向下的装配建模方法。通过对覆盖件造型特点的分析，对自由曲线曲面造型技术进行了理论研究。对覆盖件曲面造型中的关键技术曲面拼接和曲面过渡的算法进行了分析。以装配建模理论为基础，针对覆盖件产品的开发特点，对面向装配的CAD建模技术进行了深入研究。对覆盖件产品的装配模型进行了描述；提出了覆盖件装配建模的一般流程；详细研究了覆盖件的CAD装配建模技术；对面向装配的CAD建模技术在覆盖件产品反求设计中的应用进行了研究，介绍了产品覆盖件的反求流程，提出了基于装配的数据测量方法，分析了面向装配的曲面重构技术。结合某摩托车集团改型开发新款摩托车的项目和某汽车有限公司实施数字样机技术的项目，通过理论联系实际，在工程实践中验证了本文的研究内容和研究方法。
With the development of high-tech, manufacturing industry has been come into a new field. As important design method of product, the technology of digital mock-up has been widely applied to manufacturing field. In the process of product development making use of digital mock-up, assembly-oriented CAD modeling technology are very important. The thesis addresses the theory and methods of assembly-oriented CAD modeling technology according to the characteristics of panels.A study of DFA (design for assembly) is presented. The running mode and system of DFA are discussed. The content of assembly modeling is provided. Assembly relationships, assembly hiberarchy and assembly restraints are analyzed. The assembly modeling methods of bottom-up and top-down are put forward. The author summarizes the characteristics of panels, investigates the modeling technology of free-form curve and surface; The algorithm of surface joining and surface blending is also analyzed.Assembly-oriented CAD modeling technology based on assembly modeling theory is analyzed and investigated in panels product design. The assembly model of panels is indicated. The general flow of assembly modeling of panels product is put forward. The key technology of Assembly-oriented CAD modeling in panels product design is analyzed. The application of assembly-oriented CAD modeling technology in reverse engineering is also presented; The assembly-oriented data measure method is put forward; The assembly-oriented surface reconstruction technology is analyzed.With the project "The Construction of digital mock-up for a mini-car" supported by an automobile corporation, Ltd. and the project " The Rapid Development and Variant Design of some brand of motorcycle" supported by a motorcycle corporation, the author summarizes the experience of assembly modeling for digital prototyping, and provides sound proof for the viewpoints in the thesis.
|
