CDRS系统在车身逆向工程设计方面的应用

北汽福田公司在引入三维CAD软件后,已初步具备了实施逆向工程的能力。但一般三维CAD软件虽然在汽车车身结构设计方面的功能很强,但在曲面光顺方面却比较繁琐,因此,曲面光顺一直成为制约车身开发进度的重要因素。为了进一步加快车身的开发速度,使逆向工程深入实施,北汽福田公司引入了PTC公司的CDRS工业造型软件,经过两次人员培训及两次应用示范工程后,在微卡前面罩上成功应用,并解决了CDRS与现有三维CAD软件之间的接口问题,实现了数据的可靠传递,形成了新的逆向工程开发流程,使设计效率及质量得到了很大的提高。一、 原…     

产品CAD/CAM逆向工程

本文阐述了CAD／CAM逆向工程的关键技术和过程，介绍了两个应用事例，说明了该技术是CAD／CAM重要组成部分，并可大大缩短模具设计和加工的周期。     

6110气缸盖的三维建模

采用逆向工程的方法，应用当今流行的Pro／Engineer软件对我厂主导产品6110柴油机的气缸盖进行了三维建模，并提出了企业中应用CAD／CAE／CAM技术的一些思路。     

Geomagic Fashion在逆向工程快速曲面造型中的应用

曲面重建是逆向工程中最为关键的环节之一,其处理速度和质量最终制约着下游CAD再设计等作业进程.     

基于UGNX的高速摩托艇设计与数字化制造的集成应用

该文以UG NX作为开发平台,以某高速摩托艇产品研发过程中涉及的产品逆向工程、装配设计、模具设计、数控加工编程和塑性成型模拟分析等核心关键技术应用研究为对象,简略讲述了UGNX作为CAD/CAM/CAE集成平台的应用过程及其在提高企业新产品开发设计制造效率,为企业创造巨大经济效益中所发挥的作用。     

逆向工程中IGES数据接口的实现

逆向工程是当前先进制造技术研究的热点之一,通过对IGES标准及曲面实体数据的结构分析,进行逆向CAD软件的IGES接口设计,实现逆向软件与通用CAD造型软件之间曲面数据转换。     

基于CATIA逆向工程的减震垫设计

简要介绍了逆向工程在工业设计中的应用及逆向工程在CAITIA中的实现,并应用CATIA软件提供的逆向工程模块对航空发动机涡轮叶片减震垫进行建模,最后提出了对逆向工程设计的几点体会。     

马路科技与PolyWorks CAV快速计算机辅助检测

1.公司概况 马路科技顾问股份有限公司成立于1996年,在RE/RP/CAD/CAM/CAV应用领域中,它是UGS最高白金级代理商,并整合多家欧美软、硬件大厂之尖端研发平台,是RE(逆向工程)加RP(快速原型)的领导者,为国内外企业提供从概念工程、工业设计、逆向工程、结构设计、加工制造到检测工程的全方位解决方案,其客户群遍及汽车、航天、3C、工艺等产业,并以完善之技术服务享誉全国.     

基于层析数据的CAD模型三维重构的实现

本文阐述了逆向工程的基本概念,介绍了作者开发的基于层析数据的CAD模型三维重构逆工程系统。该系统读入实物原型的层析数据,经过预处理和特征识别后,输出特征数据,在SolidWorks97的支持下实现三维重构。最后给出了两个重构实例。     

基于三坐标测量机的曲面零件逆向设计研究

逆向工程也称反求工程,是对现有三维实物(样品或模型),利用三维数字化测量设备准确、快速测得轮廓的几何数据,并加以建构、编辑、修改生成通用输出格式的曲面数字化模型,从而生成三维CAD实体数模、数控加工程序或快速原型制造所需的模型截面轮廓数据。介绍了逆向设计,以波轮零件为例,分析了曲面零件特征,说明了应用三维CAD软件建立零件模型过程和方法,论述了基于三坐标测量机的曲面零件的逆向设计和验证过程。     

基于实体的特征反求技术研究

反求工程是当今CAD建模技术的一种重要途径,它极大地提高了设计人员的设计效率.然而仅包含曲面信息的三维重构限制了反求工程与CAD/CAPP/CAM系统的集成.针对这一问题,本文提出了基于多色图表示子特征之间空间约束关系的集合运算思路,可以较好地得到反求实体的特征信息以及特征树的结构利于其后的CAD模型的再设计、设计分析和加工.     

反求工程CAD建模技术研究

将设计思想或实物原型迅速、直接、精确地转变为可以再加工的CAD模型,是产品创新设计和快速原型制造面临的关键技术,综合国内外反求工程CAD建模的研究和应用现状,分析了反求工程CAD建模问题的特点和需要进一步解决的主要问题,讨论了目前工程界普遍采用的反求工程CAD建模技术与思路,以及作者在解决这一系列问题中取得的进展情况。     

Overview of 3D printing technologies for reverse engineering product design

With the rapid development of computer and information automatics, advanced manufacturing technologies (such as numerical control technology and computer-aided manufacturing) have been invented and matured. In the face of fierce competition in the international market of 21st century, high-tech application becomes one of the main battle fields. In recent years, reverse engineering technology has developed rapidly, through which the digital computer-aided design (CAD) models of products can be obtained rapidly and accurately; in association with optimization design, computer aided design and finite element analysis, reverse engineering technology significantly improves the development efficiency of new products. As one of the representative technologies of the third industrial revolution, three-dimensional (3D) printing technology is adopted in reverse engineering to realize rapid manufacturing of products in a lot of fields; in addition, 3D printing is gradually penetrating into each link of product design, attracting more and more attention from industrial and investment communities.     

参数化设计综述

参数化设计是当前CAD技术中的一个研究热点。对参数化技术进行深入的研究,对于提高我国企业的CAD自动化程度以及竞争力有着重要的现实意义。该文对当前的参数化设计技术做了综述,并结合笔者对参数化的理解与观点,阐述了参数化设计技术的现状以及一些相关研究内容,同时分析了目前研究中所存在的不足,指出了参数化技术的未来发展趋势。     

Structural optimization of as-built parts using reverse engineering and evolution strategies

In industry, some parts are prone to failures or their design is simply sub-optimal. In those critical situations, one would like to be able to make changes to the part, making it lighter or improving its mechanical resistance. The problem of as-built parts is that the original computer-aided design (CAD) model is not available or is lost. To optimize them, a reverse engineering process is necessary to capture the shape and topology of the original design. This paper describes how to capture the original design geometry using a semi-automated reverse engineering process based on measurement provided by an optical 3D sensor. Following this reverse engineering process, a Fixed Grid Finite Element method and evolutionary algorithms are used to find the optimum shape that will minimize stress and weight. Several examples of industrial parts are presented. These examples show the advantages and disadvantages of the proposed method in an industrial scenario. Presented at the 7th World Congress on Computational Mechanics, Los Angeles 2006.     

VLSI design and CAD technology in Korea

An overview is given of Korean VLSI and CAD technology, which did not develop naturally as it did in more advanced countries. Korean engineers had no electronic systems developed domestically for studying bipolar and MOS IC design. Consequently, they had to apply reverse engineering to the problem, which slowed development considerably. In 1982, the Korean government initiated the national project specifically to speed the progress of electronic technology development. Since then, VLSI design and CAD technology have begun to spread throughout the country. A prototype CAD system, called EDAS, was developed this year, and the project's goal has become the establishment of fully domestic VLSI CAD technology by 1991     

Reverse engineering in the design of turbine blades – a case study in applying the MAMDP

This paper presents a case study on the reverse engineering of turbine blades used in nuclear power generators. Reverse engineering has been widely recognised as a crucial step in the product design cycle. However, major problems with current reverse engineering technology are the inefficient surface reconstruction process, lack of digitising accuracy control in the data digitisation process, and bottlenecks resulted from huge amounts of digitised surface points in the surface modeling process. Moreover, under this limitation, modern concurrent engineering concepts are difficult to implement to obtain optimal product design. This study applies a developed reverse engineering approach – the modified adaptive model-based digitizing process (MAMDP) to the 3D geometric design of turbine blades. The approach integrates surface digitising and modeling processes of turbine blades into a single surface reconstruction process. Using the approach, accurate product CAD models can be efficiently generated and the product design cycle of turbine blades can be successfully linked.     

基于IGES的数据交换接口实现

文章通过对IGES中性标准的分析,设计了一个逆向工程数据处理软件数据交互接口的框架。在此框架基础上,实现了重构模型与各种工程设计软件之间的数据信息交换,并应用于相关软件的编制中。     

服装CAD技术现状及发展趋势

近几年,服装CAD系统在服装企业中的应用得到了迅速的发展。综述了国内服装CAD系统的发展及服装CAD技术在企业应用中存在的问题,对其中制约其发展的因素进行了阐述,特别是关于3D服装CAD技术方面,并对服装CAD技术的发展趋势进行了分析。     

The recovery of design intent in reverse engineering problems

This article presents a method of reverse engineering applied to the particular case of a cam in order to recover the form and dimensions of the design of the original piece, which take into account: design intent, general knowledge of the problem, different geometric and dimensional restrictions, and the digitized point cloud. Rather than by employing complex mathematical algorithms, a fit is achieved by drawing a parametric outline that complies with the design intent, and by adjusting the different parameters through successive approximations using commercial CAD software commands.