【作者】 潘斌；

【导师】 夏链；

【作者基本信息】 合肥工业大学 ， 机械电子工程， 2006， 硕士

【摘要】 随着现代计算机技术及测量技术的发展,利用CAD/CAM技术,先进制造技术来实现产品实物的逆向设计制造,已成为CAD/CAM领域的一个研究热点,并成为逆向工程技术应用的主要内容。覆盖件作为汽车的重要组成部分,是汽车的整体性能和形象的最重要的决定因素之一,具有材料薄、形状复杂、结构尺寸大、表面质量要求高等特点。为此,本文着重研究了汽车覆盖件的快速原型设计及有限元分析的相干理论和方法。 首先论述逆向工程两大环节:测量和后处理,测量是逆向工程的首要任务,采用非接触式三维激光扫描仪对覆盖件进行扫描得到引擎盖的扫描数据,以用于后续模型的重建。后处理是逆向工程中最重要,最繁杂的一环,主要有点数据的处理,曲面的拟合、构建等组成,本文是在CATIA平台下对扫描得到的点云数据进行曲面重构。然后通过对重新建立的模型进行一些必要的有限元应力应变分析,获得零件在应力应变方面的性能数据,通过分析结果,对原来的零件进行结构或者材料方面的改进,提高覆盖件的质量。 利用逆向工程作为产品制造的一种手段,可以将符合要求的汽车覆盖件零件进行测量并反求出零件和模具的CAD模型,提高汽车覆盖件模具的生产效率,减少修模量,降低了模具制造成本,为吸收国外先进技术来加快汽车工业的发展提供一种途径。更多还原

【Abstract】 With the development of modern computer technology and measuring technology, the reverse design and manufacture using the CAD/CAM technology and advanced manufacturing technology has become the hot point of research. Automotive panel, the critical part of automobile is one of the most significant determinants in the overall performance and image of the automobile. Automotive panel have to be equipped with such characteristics as thin materials, complex shapes, considerable physical dimensions as well as high-quality surface. Accordingly, in this paper, the theories and methods concerning the rapid original design and finite element analysis of automobile panel are studied in detail and depth.First of all, two respects of reverse engineering are introduced: measure and post-processing. Measure is the principle task of reverse engineering, that is, getting the scanned data of the engine cover by scanning automotive panel via non-contact three-dimensional laser scanner in order to reconstruct the subsequent models. Post-processing is the most pivotal and complex part of reverse engineering, including the handling of point data, surface fitting, reconstructing and border trimming. In this paper, the point cloud data gained by scanning are utilized to reconstruct the curved face. Then through several indispensable finite element stress-stain analysis of the model reconstructed, all the data concerning such characteristics as stress and strain can be gained. By analyzing the results, the original structure and materials of the part can be meliorated.Reverse engineering, a method of manufacturing products could gain the CAD model of the parts and moulds, enhance the efficiency of manufacturing the moulds, reduce mold-repair quantity, and diminish the cost of manufacturing moulds by the way of measuring those automobile automotive panel with standard quality. Therefore, this paper presents a new method of assimilating the outside technology to accelerate the development of national automobile industry.更多还原