UG环境下直接适应性切片方法

适应性分层是解决快速成型的成型精度和成型速度这一对矛盾体的最好方法之一.文中利用了UG二次开发技术,通过比较切片的轮廓数目和面积来综合判断层厚,提出了一种基于CAD模型的直接适应性切片方法.针对算法中的关键问题,进行了深入探讨.最后给出了分层实例,并对结果进行了分析.     

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。     

一种新的快速成型方法--木粉分层喷胶

介绍了一种新的快速成型方法——木粉分层喷胶,对木粉分层喷胶快速成型方法的工作原理,软件、硬件配置,以及快速成型技术的发展前景作了介绍,本方法在一定程度上解决了目前快速成型成本高的问题.     

基于层合速凝技术的陶瓷件快速成型研究

结合快速原型制造技术的原理提出了一种新的陶瓷制件快速成型技术,即层合速凝快速成型技术.该技术特别适用于复杂陶瓷制件的快速制造,具有高效率、高精度、低成本等特点.主要介绍了层合速凝快速成型技术的原理和应用于陶瓷制件的研究现状,比较分析了该技术三种不同工艺的优缺点,并对该技术今后的发展作了展望.     

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。     

SolidWorks环境下快速成型工艺的虚拟评价方法

为解决快速成型工艺方案选择困难及成型以后才能进行评价的问题,提出了基于SolidWorks环境的快速成型工艺虚拟评价方法.该方法在SolidWorks环境下,利用SolidWorks的应用程序接口函数,采用VB编程和二次开发技术,实现了三维复杂形状零件快速成型工艺的虚拟仿真.该方法可针对不同类型和参数的分层方案进行加工过程的仿真,在SolidWorks中直接生成不同工艺条件下的可视化虚拟成型结果,并可对误差结果进行颜色渲染和量化分析.通过对可视化结果的分析和计算,可选择出最适合的快速成型工艺方案,从而提高快速成型制件的成型效率和精度,减少失败次数.     

改进的激光快速成型自适应分层算法

激光快速成型技术中,截面轮廓数据的计算和处理是高效分层算法的关键环节.在分析基于有向加权图分层算法的基础上,提出了一种改进的快速自适应分层算法,即去掉原算法中耗时的建立有向加权图的过程,在保证轮廓精度的同时,删除冗余的结点数据,根据处理后的结点数据,直接计算满足最小台阶误差下一层的分层厚度,使得分层厚度随轮廓数据的改变成为可变的.实验数据表明,改进后的算法提高了轮廓数据处理的效率,较好的满足了激光快速成型制造技术对成型精度和实时性要求.     

快速成型技术中分层算法的研究与进展

根据对零件制造精度和效率的关注程度的不同,开发出了多种分层算法.在同等加工时间的情况下,根据加工精度的不同,将这些分层算法分为等层厚分层算法和适应性分层算法两类.通过对STL模型、原始CAD模型和点云数据的分析,讨论了两类分层算法的研究和发展,然后介绍了斜边分层算法和曲面分层算法等先进分层算法的原理和成果,最后讨论了快速成型分层算法的研究方向和趋势.     

.Net技术在快速成型制造系统中的应用

基于Microsoft.Net平台的快速成型制造系统,运用B/S三层框架结构,实现了进行远程的快速成型制造系统的各个工作流程,具有适应性强、安全性好、整体性能好的优点.最后介绍了建立这一系统的关键支撑技术.     

人工骨个性化定制与激光快速成型

复杂曲面的人工骨个性化定制与激光快速成型一直是人工骨设计与制造的难点,针对此问题提出了一种由自然骨CT切片数据构建STL模型并采用激光快速成型的方法。首先对自然骨CT切片进行目标边缘提取,并采用八邻域跟踪算法获取自然骨的轮廓数据;然后,为满足激光快速成型对层片厚度的加工要求,建立相邻断层切片上的轮廓匹配点对,根据轮廓匹配点对,线性插值得到中间过渡轮廓数据,并采用三次样条曲线对自然骨轮廓进行拟合;最后采用最小对角线三角剖分法生成自然骨的STL模型,并通过激光快速成型机打印出人工骨。试验验证了方法的可行性与有效性。     

Direct Slicing from PowerSHAPE Models for Rapid Prototyping

Rapid prototyping processes produce parts layer by layer directly from CAD models. An efficient method is required to slice the geometric model of a part into layers. Several slicing methods are introduced in this paper: slicing from STL files; tolerate-errors slicing; adaptive slicing; direct slicing; adaptive and direct slicing. PowerSHAPE is a powerful package for building models, and it provided macro language and picture files for its secondary development work. To meet rapid proto-typing slicing demands, the author proposes a direct slicing approach based on PowerSHAPE models. In this method, lines, arcs and Bezier curves are used to describe the section contours. This approach can be used in stereolithography, selective laser sintering, fused deposition modelling, and other rapid prototyping processes, e.g. laminated object manufacturing. It may be the future solution to existing slicing problems.     

Adaptive direct slicing of a commercial CAD model for use in rapid prototyping

Slicing a 3D graphic model into layers of 2D contour plots is an essential step for all rapid prototyping (RP) machines. Various methods are available, such as stereo lithography (STL) file slicing, direct slicing and adaptive direct slicing. Amongst these, adaptive direct slicing is the most advanced for its capability of adapting the slicing thickness according to the curvature of any contour. In this study, an adaptive direct slicing method complete with the algorithm for calculating the thickness of each layer is proposed. As an illustration of the method, the algorithm was programmed within the commercial CAD software package, PowerSHAPE. The method was shown to be fast and accurate in comparison with STL file slicing and direct slicing, which both used a constant layer thickness. An erratum to this article can be found at     

Recommended slicing positions for adaptive direct slicing by image processing technique

Build time and accuracy are two contradicting issues that have been a major concern in rapid prototyping, and have led to the development of many slicing approaches including those applying adaptive slicing, direct slicing, and adaptive direct slicing concepts. Presented in this paper is an approach for adaptive direct slicing that applies image processing technique to determine appropriate thickness for each sliced layer and to recommend slicing positions on a 3D CAD model. Two orthogonal views of a model are captured and converted to be edge images before being analyzed, and based on the surface complexity on the two edge images, slicing positions are recommended. These positions are passed to the CAD software for slicing activities. This adaptive direct slicing approach has been implemented on LabVIEW platform and compared with uniform direct slicing approach and uniform cusp height approach. The results show that this slicing approach improved slicing performance by reducing the number of layer which has a direct impact on build time while maintaining surface quality at the same level as the thin uniform direct slicing. Since its inputs are the images of a CAD model instead of the model itself, this adaptive direct slicing supports any CAD software.     

基于3D CAD模型表面Z向特征曲线的自适应分层方法

为提高快速成形中3D CAD模型的分层效率和分层精度,定义了模型表面Z向特征曲线的概念及提取原则,建立了模型表面几何特征到层厚的直接映射关系,提出一种基于模型表面多处兴趣特征的快速自适应分层算法。该算法利用Z向特征曲线提取CAD模型表面的兴趣特征,通过特征曲线几何特征到层厚的直接映射关系快速确定分层点处的适应性层厚,整个层厚计算过程不存在冗余计算。结果表明,该算法能够高效地计算复杂形状3D模型在分层点处的最优层厚,实现3D模型的快速自适应分层。     

DIRECT AND ADAPTIVE SLICING ON CAD MODEL OF IDEAL FUNCTIONAL MATERIAL COMPONENTS （IFMC）

A brand new direct and adaptive slicing approach is proposed, which can apparently improve the part accuracy and reduce the building time. At least two stages are included in this operation: getting the crossing contour of the cutting plane with the solid part and determining the layer thickness. Apart from usual SPI algorithm, slicing of the solid model has its special requirements. Enabling the contour line segments of the cross-section as long as possible is one of them, which is for improving manufacturing efficiency and is reached by adaptively adjusting the step direction and the step size at every crossing point to obtain optimized secant height. The layer thickness determination can be divided into two phases: the geometry-based thickness estimation and the material-based thickness verifying. During the former phase, the geometry tolerance is divided into two parts: a variety of curves are approximated by a circular arc, which introduces the first part, and the deviation error between the contour     

快速成型技术中分层算法的研究综述

作为快速成型技术中必不可少的环节,根据对零件制造精度和装配要求及效率的侧重不同,多年来多种分层算法已被国内外学者开发出来。在同等加工条件下,根据加工精度要求和层厚变化的不同,将分层算法大致分为等层厚分层算法和适应性分层算法两类。从常用的立体光刻(STL)模型、原始计算机辅助设计(CAD)模型和点云数据3种数据模型入手,简述了两类分层算法的研究和发展;介绍了采用斜边的分层算法、基于区域划分的混合算法、曲面分层算法等先进分层算法;讨论了分层算法中待解决的问题:直接分层算法的文件格式标准和轮廓的精确拟合等问题。最后,总结得出了分层算法未来的研究方向和趋势。     

Direct slicing and G-code contour for rapid prototyping machine of UV resin spray using PowerSOLUTION macro commands

Rapid prototyping processes produce parts layer by layer directly from 3D CAD models. An important technique is required to slice the geometric model of a part into layers and to generate a motion code of the cross-sectional contour. Several slicing methods are available, such as slicing from sterolithgraphy (STL) files, tolerate-error slicing, adaptive slicing, direct slicing, and, adaptive and direct slicing. This paper proposes direct slicing from 3D CAD models and generating a G-code contour of each layer using PowerSOLUTION software (Delcam International, Birmingham, UK). PowerSOLUTION includes two main modules: PowerSHAPE is used to build 3D CAD models and PowerMILL is used to produce G-Code tool paths. It provides macro language, picture files and cutting paths for secondary development work.The authors used macro commands to write an interface generating direct slicing from 3D CAD models and G-code contours for all layers. Most well-known controllers in the market accept the G-Code. Therefore, it is easier to apply this scheme in a CNC-machining center to produce rapid prototyping such as laminated object manufacturing (LOM) for complex geometries. The interface was successfully applied the interface to the UV resin spray rapid prototyping (UVRS-RP) machine that was developed to produce RP.     

Adaptive slicing of functionally graded material objects for rapid prototyping

Slicing is a fundamental process planning task and an important procedure in rapid prototyping. However, most research currently focuses on the slicing of homogeneous objects and few approaches for slicing of heterogeneous objects have been reported in the literature. In this article, we present an approach for adaptive slicing of functionally graded material objects. Unlike homogeneous objects, functionally graded material objects contain both geometry and material information. The layer thickness is computed by considering not only geometry but also material variation along the build direction. The continuous material distribution in each layer is discretised into step-wise gradings by subdividing the slice into sub-regions, which can be regarded as homogeneous material regions. An algorithm that summarised the slicing procedure is described and an example is also presented.