共查询到20条相似文献,搜索用时 125 毫秒
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现在CAX系统多是以单元自动化为目标来开发和应用的,各系统的数据在逻辑结构和物理结构上均存在较大差异,产品数据交换就成为一亟待解决的问题.在今后较长时期内多种数据交换标准并存的事实条件下,提出利用三维几何模型的中性文件格式之间的数据交换来解决该问题.简介了中性文件交换的接口方案及交换过程,详细讨论了中性文件格式的数据交换方法并给出了应用中性文件格式的数据交换方法实现三维几何模型的转换实例. 相似文献
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异构CAD系统的零件库几何信息接口的研究 总被引:2,自引:0,他引:2
指出了遵循零件库标准PLIB开发几何信息接口所存在的问题及原因 ,进而给出了具体的解决方法 :( 1)扩充EXPRESS语言的编程支持功能 ;( 2 )重构零件库几何形状表达的逻辑模型。并在此模型基础上给出了开发接口的实例 ,实现了异构CAD系统零件库信息的共享 相似文献
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三维几何模型的中性文件格式的数据交换方法研究 总被引:4,自引:0,他引:4
现在CAX系统多是以单元自动化为目标来开发和应用的,各系统的数据在逻辑结构和物理结构上均存在较大差异,产品数据交换就成为一亟待解决的问题。在今后较长时期内多种数据交换标准并存的事实条件下,提出利用三维几何模型的中性文件格式之间的数据交换来解决该问题。简介了中性文件交换的接口方案及交换过程,详细讨论了中性文件格式的数据交换并给出了应用中性文件模式的数据交换方法实现三维几何模型的转换实例。 相似文献
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基于Web的零件库系统关键技术的研究与实现 总被引:10,自引:0,他引:10
基于Web的零件库系统对建立基于Web的供应链管理系统和实现网络化制造都具有十分重要的意义。本文对基于Web的零件库系统的关键技术进行了研究 ,包括网络环境下零件库信息的共享、异构CAD系统零件几何模型的中性表达以及零件几何模型的可视化等 ,并给出了具体的解决方案 ,实现了基于Web的零件库信息的共享。 相似文献
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异构CAD系统零件库几何信息交换的研究 总被引:4,自引:0,他引:4
给出了实现异构CAD系统间零件库几何信息共享的一种新思路和有效途径 :分析主流通用三维CAD系统的共性 ,补充PLIB标准中零件几何信息模型的高层实体定义 ,进而考虑零件参数化信息和特征信息 ,建立基于特征的零件精确几何表达机制。在此基础上开发的接口实现了异构CAD系统间零件几何信息以及设计意图的共享。 相似文献
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文章详细讨论了旧的数控编程接口标准ISO6983的缺点,研究了基于新数控编程接口标准STEP-NC的数控系统中的NURBS插补技术.详细讨论了NURBS插补算法,并进行了误差分析.STEP-NC数控系统能够直接处理由NURBS表示的几何信息和加工工艺信息,通过采用STEP-NC新数控编程接口,确保零件的NURBS曲线曲面几何信息和加工信息完整的输入到数控系统.NURBS插补程序量少,速度快,精度高,有利于提高生产率和改善产品质量.NURBS插补技术的研究为进一步研究STEP-NC数控系统奠定了基础. 相似文献
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J. Gao D.T. Zheng N. Gindy 《The International Journal of Advanced Manufacturing Technology》2004,24(7-8):573-581
Feature-based CAD/CAM integration is a technology used to realise automatic transmission and conversion of component information among CAD, CAPP and CAM applications. A feature is the medium of information transmission in the integration. Since a process planning downstream application has a different viewpoint from the component designer, feature conversion or feature extraction methodology is used to create a machining feature model based on the design feature model. One of the major difficulties in generating machining features is the preservation of feature integrity because of feature interactivity. The most current research, therefore, focuses on the planar-type form feature conversion. This paper discusses the problem of feature interactivity and proposes a feature-based approach to generating hole-series machining features from a design feature model. Hole-series features are important machining features for gearbox components used in machine tools. These kinds of features cannot be obtained directly from a design feature database. A constraint-based method is developed in this paper to define a hole-series feature model based on the geometric and topological information extracted from the design database. In addition, a STEP file is generated to interface the converted machining feature model with the downstream CAPP application. The implemented feature conversion system is verified by considering its application to some component examples and the developed prototype CAPP system. This revised version was published online in October 2004 with a correction to the issue number. 相似文献
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Chua Chee Kai Gan G. K. Jacob Tong Mei 《The International Journal of Advanced Manufacturing Technology》1997,13(8):571-576
The STL (STereoLithography) file format, as developed by 3D Systems, has been widely used by most Rapid Prototyping (RP) systems and is supported by all major computer-aided design (CAD) systems. However, it is necessary to improve the STL format to meet the development needs of RP technologies. In Part 1, several existing and proposed formats have been discussed. This paper, Part 2, will present an improved interface between CAD and RP systems. The new interface is a file format that supports the STL format, removes redundant information in the STL format and adds topological information to balance storage and processing cost. In addition to supporting facet boundary models, the new interface supports precise models by using the edge-based boundary representation. This paper discusses the design considerations of the new interface and data structures for both facet models and precise models. Finally, a comparison of the new interface and the STL file format will be made. 相似文献
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设计一种较经济的基于以太网接口的数据采集器,使WINDOWS主控机能通过以太网接口可靠地实现对DOS采集器的控制,以完成瞬态信号的采集。目前,利用该机制设计的采集器已成功地应用于实际中,并充分验证了所制订的信息交互机制及设计思路的正确性。 相似文献
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