基于自由曲面点云的快速原型制作技术研究

针对不附加任何拓扑和几何信息的云状数据三维重建问题,提出了对点云直接进行分层处理快速制作原型的新方法。在对点集进行空间结构划分的基础上,采用最小距离关联点对方法提取层面轮廓线数据,并对其加以匀化和精整从而直接生成快速成形机的层片接口文件,避免了常规方法存在的耗时和需要很高的造型技巧等不足,而且片面的错误校验与修补等繁琐工作也将不再进行,提高了快速成形前处理的效率,非常适合分层实体制造(LOM)等成形工艺。     

基于IMAGEWARE风扇叶反求与快速原型制作

以风扇为研究对象,论述了逆向工程技术与快速原型技术相结合的方法.在逆向工程中应用IMAGEWARE软件处理三维激光扫描仪测量得到的风扇点云数据,进而使用三维造型软件Pro/E对其进行了曲面重构,获得了所需的风扇实体模型,并对风扇叶进行了的模具设计,为新产品开发中的预评估、有限元分析等提供了宏观的模型和产品开发依据.     

基于逆向工程的快速原型技术

这里论述了RP技术与逆向工程技术相结合的方法。在逆向工程中应用CATIA软件处理激光测量的方法得到的汽车尾部局部点云数据，进行曲面重构，获昨快速原型所需的实体模型。     

面向快速原型制造的逆向工程三维离散数据点云处理技术

针对基于快速原型制造的逆向工程散乱数据点云,提出了一种先加权中值滤波,再小波分析滤波的新降噪方法。     

造型设计及快速原型制造

反求工程是指用一定的测量手段对实物或模型进行测量,根据测量数据通过三维几何建模方法,重构实物的CAD模型,从而实现产品设计与制造的过程。利用三坐标测量机对水杯表面进行测量,得到的数据,常称为"点云",其经过一定数据处理后,需在Pro/E软件中进行三维实体重构,得到水杯的三维造型图,最后利用快速成型机将水杯的实体三维打印出来,这样不但实现了由实物样品到产品的快速制造,及时发现产品的问题并修改完善产品设计,还缩短生产周期,降低生产成本。     

基于Pro/E的手机外壳三维造型与快速原型制造

叙述了快速原型技术的基本原理,总结出快速原型制造的特点;以iphone 4S手机外壳为例,利用Pro/Engineer对手机外壳和手机实体进行三维造型和装配,并使用Aurora软件和快速原型机制造出手机外壳。     

基于ATOS测量系统原型曲面快速数字测量及处理

随着市场多品种、新产品、短周期日益增长的消费需求,推动着原型曲面快速数字测量及处理的研究。ATOS光栅扫描快速测量获取零件原型曲面的点云数据,并利用ATOS软件系统直接处理测量点云,在实际运用中有效地保证了快捷推出新品的技术需求。     

基于Pro／E的牙列快速原型制造

探讨了Pro/E的牙列快速原型制造过程中的一些关键技术及其医学应用。     

逆向工程中数字化测量与点云数据处理

逆向工程作为新产品开发和消化、吸收先进技术的重要手段,其应用越来越受到重视。本文主要总了逆向工程中数据测量方法及影响测量精度的因素,从噪声去除、多视对齐、数据光顺、数据精简、数据分割等方面讨论了点云数据的处理方法。     

基于Geomagic和Pro/E的逆向工程技术应用

根据原始招财猫扫描的点云数据,经过点云数据处理和NURBS曲面创建,生成招财猫内外表面的CAD模型;再利用Pro/E软件生成薄壁实体,为复杂曲面的实体化逆向工程设计提供了一种简单可行的方法。     

基于快速原形制造的反求工程

探讨了反求工程在快速造型技术中的重要作用,并以缸盖为例,对反求工程中的测量方法作了分析,总结了与快速造型技术相匹配的数据测量的方法及建模技术。     

The design and manufacturing of porous scaffolds for tissue engineering using rapid prototyping

This research paper addresses the issue of developing an efficient methodology to design and manufacture a complex scaffold structure of desired porosity required for tissue engineering applications using a novel approach based on fused deposition modelling (FDM) rapid prototyping (RP) technology. The scaffold provides a temporary biomechanical structure for cell growth and proliferation to produce the required body parts. Conventional techniques of scaffold fabrication (such as fibre bonding, solvent casting and melt moulding) generate scaffolds with unpredictable pore sizes due to their limitations in flexibility and control of pore volume and distribution. Moreover, such scaffolds have poor mechanical strength and structural stability. The paper describes an FDM pre-processor that ensures the fabrication of scaffolds of desired porosity and inter-connectivity on the FDM system.     

从CT灰度图像到快速原型制造的研究

阐述从CT灰度图像到快速原型制造的一种方法,并对这种方法进行了试验性的论证。研究证明,从灰度位图图 像到黑白位图图像、矢量图像,最后实现三维重建的方法在反求工程上的可行性和实用性。     

快速成型数据处理系统研究

简述目前国内快速成型数据处理方面的发展情况，及国外在此领域的发展方向。论述了当前快速成型数据处理技术需要进一步发展完善的现状，尤其在直接切片、边界补偿、分层方案优化方法等方向有待于进一步发展。     

快速成型数据处理系统研究

简述目前国内快速成型数据处理方面的发展情况，及国外在此领域的发展方向。论述了当前快速成型数据处理技术需要进一步发展完善的现状，尤其在直接切片、边界补偿、分层方案优化方法等方向有待于进一步发展。     

Improved intermediate point curve model for integrating reverse engineering and rapid prototyping

Direct integration of reverse engineering and rapid prototyping removes two intermediate steps of surface fitting from point cloud data and STL file generation from CAD models. Therefore errors introduced due to surface fitting and triangulations are eliminated and also the process of STL data validation and repair is avoided. Intermediate point based curve model (IPCM) method is one of the promising approaches for direct integration of reverse engineering and rapid prototyping however this approach has the limitation that it cannot handle objects, which result in multiple contoured slices. Moreover, IPCM based method is implemented with layers of constant thickness slices, and adaptive slicing with this method is not attempted. The present work is an attempt towards improving the capabilities of IPCM based method by overcoming the above-mentioned two limitations. The new system developed here has been tested on many parts, which demonstrates the capability of the proposed system. An erratum to this article can be found at     

基于"RPM"的快速反求工程

反求工程是一种应用非常广泛的新兴技术,在快速成形制造中具有重要作用。介绍了基于快速原型制造的快速反求工程系统的原理、测量方法以及数据处理方法,并指出了关键的问题和发展趋势。     

Direct integration of reverse engineering and rapid prototyping based on the properties of NURBS or B-spline

As product varieties increase and life cycles shorten, the need to reduce product development time becomes more critical to maintain competitiveness in the market. The reduction of the product development time, therefore, requires revolutionary improvements rather than gradual changes in technology. Based on a novel strategy the procedure for integration of reverse engineering and rapid prototyping was developed in this paper. Direct integration of reverse engineering and rapid prototyping is not a new issue and its importance has been demonstrated by many authors. However, all traditional algorithms for integration of RE and RP operate on scattered points directly such that some useful information for example curvature, normal and geometric shape, which are necessary for adaptive slicing in RP, cannot be obtained. To resolve the difficult dilemma a new algorithm is developed to build a bridge between scattered points and adaptive slicing.