数据准备软件DPS的开发与设计

对于SMT工艺技术人员来说,一个重要的工作就是从CAD设计系统中获取必要的特征数据,经过相应的整理、转换,使之能成为符合要求的格式。在数据准备过程中我们发现了一些问题,例如CAD设计系统和SMT设备定义的元件角度不一样等等。为解决这些问题,作者开发了数据准备系统DPS,它能自动检查并修正元件角度,此外,DPS能处理多种格式的CAD数据,犬幅度提高生产效率,证明了本解决方案的优越性和高效性。文章详细介绍了DPS软件的设计与开发中的思想、方法和经验,并着重探讨了坐标数据的处理和转换。     

纱线与织物实物模拟技术初探

分析了纺织品CAD中实物模拟技术,分别从纱线和织物角度对纺织品外观的模拟技术进行了介绍、分析,并展示了各种不同模拟技术所产生的外观效果,最后对实物模拟技术的发展进行了展望.     

信息技术对服装行业发展的作用

文章以福建福州市服装业为例,分析了目前服装行业存在的问题及对信息技术的需求,提出信息技术(包括服装CAD技术、服装CAM技术、量身定制系统、ERP系统)对服装企业解决现存问题及长远持续、健康发展的重要性.目的是希望服装企业能够重视先进服装信息技术的应用,提高其在国际市场上的竞争力,将服装行业做强做大.     

SolidWorks软件的薄膜蒸发器虚拟装配

以三维参数化造型软件SolidWorks2005为绘图支撑软件,结合Visual Basic6.0对SolidWorks2005进行二次开发,实现薄膜蒸发器的虚拟装配设计.通过建立薄膜蒸发器的装配模型、装配顺序及装配路径,配合约束关系并对过程装配进行干涉检查,确保薄膜蒸发器虚拟装配过程的高效性和可靠性.薄膜蒸发器虚拟装配设计的开发对缩短产品开发周期、提高产品设计质量、优化产品结构设计具有显著意义.     

纺织服装行业电子和信息化技术应用初探

本文介绍CAD、CAM、ERP系统为主的系统集成和资源整合：服装行业的接单、设计、工艺、生产缝制、管理、控制、仓储、配送、销售及反馈、网络等等信息化和自动化。     

CMOS performance enhancement in Hybrid Orientation Technologies

Possible MOSFET performance enhancement by combining the hybrid-orientation technology (HOT) and process-induced local strain engineering is predicted for sub-45-nm CMOS technology nodes via technology CAD (TCAD) simulation. Mobility enhancements are modeled for both the hybrid orientation and process-induced local strain in CMOS technologies and are used in simulation. RF performance is investigated in detail and peak cutoff frequency, f _T of 524 GHz for n-MOSFETs and 239 GHz for p-MOSFETs are predicted from simulation.     

模架库CAD系统跨零件建模技术研究

比较了几种浇口套特征造型技术,提出基于虚零件的跨零件特征造型方法,建立相关数学模型。通过浇口套与虚零件的布尔运算对浇口套实体模型做局部修改,将装配和建模融于一体,提高了建立模架CAD系统的效率。跨零件建模技术能保持零件的相关性,并且通过虚零件方便地封装知识,实现知识辅助设计。     

变压器CAD系统的总体设计

介绍了智能集成变压嚣CAD系统的总体设计,并将CAE软件集成到该系统中.     

A model-based approach to form tolerance evaluation using non-uniform rational B-splines

Tolerance evaluation is critical to quality assurance in modern manufacturing. In contrast to traditional measurement which relies on specific hard gauges, coordinate measuring machines provide more flexibility for dimensional measurement and tolerance evaluations. To fully automate CMM inspection and tolerance evaluation, CAD/CMM integration is an important key. Although the subject of CAD-directed inspection has been widely researched, CAD model-based tolerance evaluation has received less attention. This paper presents a CAD model-based approach for evaluating general form tolerances using non-uniform rational B-splines. Unlike classical methods which construct substitute geometric features from the measurement data, this method evaluates form tolerances by comparing the measurement data with a nominal CAD model. Non-uniform rational B-spline (NURBS) is used to represent general form features since NURBS offers a common format for modeling different form features. With this unified database, a general best-fit algorithm is developed that can be applied to the evaluation of various form tolerances. Computer simulations have been performed on different form features to study the robustness and efficiency of the algorithm. Application to the profile analysis of turbo charger housing and turbine blade die segments are also presented.