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CAD/CAPP的集成是实现CAD/CAM一体化的关键。本文提出了以统一的特征产品模型为核心,实现CAD/CAPP集成的方法。根据CAD和CAPP对特征的不同要求,作者在SUN和HP工作站上用C++语言开发了特征转换接口,将CAD特征造型系统产生的数据转换为CAPP所需要的数据,实现了CAD与CAPP系统的初步集成,最后,通过一个实例验证了本方法的可行性。 相似文献
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内嵌于UG的基于特征的CAPP系统 总被引:5,自引:0,他引:5
介绍了一个内嵌于UG的CAPP系统,着重研究了基于特征的工艺规程决策机制。在内嵌于UG的特征库 的支持下进行特征设计,并通过UG提供的产品定义和几何公差模块建立了零件的信息模型,用UGAPI实现了特 征的识别、提取、匹配以及到CAPP系统的特征映射,据此开发了一个完整的内嵌于UG的CAPP系统,该系统采用 两种类型(派生式和创成式)、三种模式(编辑模式、检索模式和推理模式)的综合式工艺生成机制,已在多家企业得 到了较好的运行。 相似文献
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针对基于模型定义技术对工艺设计带来的变革,在定义工艺模型、工序模型和工序参考模型的基础上,建立了基于模型定义环境下的三维机加工艺设计模式。以工艺方法为核心,集成工艺参数信息、资源信息和检验信息,构建了一种三维工艺信息标注符号。从标注面、相关性查询、成组标注、限定区域和颜色的使用等方面制定了三维机加工艺信息标注规范。开发了三维机加工艺设计系统,并以某零件为例,验证了方法的有效性。 相似文献
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针对当前计算机辅助设计、计算机辅助工艺设计系统间三维模型信息的集成和共享问题,提出了一种基于轻量化三维模型的信息集成方法。建立了基于轻量化模型的工艺信息模型。提出了基于轻量化模型的制造特征提取方法,通过设计轻量化模型几何信息提取和判断相邻表面间邻接关系的算法,建立了轻量化模型的边界表示(B-rep)模型,然后将边界表示模型与预先定义的形状特征模板进行比较,从而识别出零件的制造特征。最后通过一个实例验证了制造特征提取方法的可行性和有效性。 相似文献
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A feature recognition system with interactive feature inspection and deletion capabilities 总被引:1,自引:1,他引:0
Dr M. W. Park H. Ko 《The International Journal of Advanced Manufacturing Technology》1996,12(3):190-196
A recognition process of the features in a part model uses the knowledge of an application engineer. The knowledge is encoded as rules of the recognition procedure that are applied to the part model during the recognition process. Such a human interaction is difficult to control in extracting the moulding features because the features moulding of the application engineer may change from one engineer to the other and external conditions may change. Instead, we treat the result of the recognition process as a first approximation of the user's intention and let the user interactively modify the result. In this paper, we present a feature recognition system where the user can inspect the result of the recognition and delete the recognised features interactively. 相似文献
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介绍一种基于特征实例的CAD/CAPP系统.在特征库的支持下,用户可完成箱体零件特征造型,形成描述性文件,系统根据描述的特征信息与特征实例库进行匹配,以获得各特征加工链,再利用工艺决策模块进行排序优化,最终获得所需加工工艺. 相似文献
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Jian Gao De Tao Zheng Nabil Gindy Doug Clark 《The International Journal of Advanced Manufacturing Technology》2005,26(4):405-414
It is important for a feature-based system to preserve feature integrity during feature operation, especially when feature interaction occurs. The paper presents a feature conversion approach to convert design features used in a design model into machining features for the downstream applications. This process includes both form features (geometric information) and non-geometric features conversion. Most researchers have concentrated on geometric information extraction and conversion without tackling the important problem of non-geometric feature information. This paper focuses on the extraction and conversion of feature geometric dimensions and tolerances (GD&T) for downstream machining application.The main barrier to the integration of a feature-based CAD/CAPP/CAM system – feature interaction – is discussed in this paper, which alters design features in their geometries and non-geometric information. How to identify and validate these feature dimensions and tolerances is one of the key issues in feature interaction conversion. The development of robust methodologies for preserving feature integrity for use in process planning application is the main thrust of the work reported in this paper. 相似文献
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Z. M. Chen S. M. Gao W. D. Li 《The International Journal of Advanced Manufacturing Technology》2007,32(1-2):99-108
A new approach to converting a design feature model (DFM) to a machining feature model (MFM) step-by-step during a design
process has been proposed. In the approach, the MFM is incrementally set up and updated through performing a local machining
feature recognition on certain areas of a design part’s B-rep when its design features are updated. The areas to be recognized
as machining features are determined through geometric reasoning according to the statuses of the DFM and the dynamically
generated MFM of the part. To facilitate the above geometric reasoning, a dynamic link list (DLL) has been developed to record
the changed topological elements during the design process and the relationships between the DFM and the MFM. Based on the
automatic and effective conversion process from design models to machining feature models, the proposed approach can support
the establishment of a concurrent product development environment to link product design and manufacturing processes seamlessly. 相似文献
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基于特征的零件CAD系统设计 总被引:1,自引:0,他引:1
特征建模技术是实现CAD/CAM集成的核心,根据CAD/CAM集成化的要求,以现有的几何造型CAD系统为基础,建立零件的特征模型,将零件的几何信息与加工工艺信息有机的联系在一起,并介绍了所开发的基于特征的轴类零件CAD系统,该造型系统可以满足CAD/CAPP/CAM集成的要求。 相似文献
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基于产品特征表达的集成化制造系统的研究 总被引:1,自引:0,他引:1
提出了一种并行工程环境下基于特征表达的产品设计和制造的集成化方法。该系统提供了用于工艺规划和可制造性评估的工艺知识库,可以被产品设计的各个阶段所共享,能够确定加工特征组合和加工顺序安排。还提出了一种确定多加工方向的加工特征组合方法,用于加方向的合理选择和特征集合的最少化,获得最优化的加工效率。另外还探讨了特征干涉对加工效率和加工质量的影响,提出了新的特征干涉分类、解决方法和特征干涉条件下加工效率的优化算法。 相似文献
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设计特征在机械产品概念设计过程中的应用 总被引:1,自引:0,他引:1
设计特征能作为功能单元建立用户需求与原理解的关系,也能将设计信息带到下游应用.因此提出了基于设计特征的概念设计过程.功能设计由设计说明书开始,包括功能需求和功能约束,由实现功能的行为方案的不同对功能进行分解,设计问题被描述为功能和实现功能的行为的层次模型.通过功能推理步骤来指导功能设计,包括因果行为推理和功能分解.当功能单元可以在设计特征库中找到实现原型时,功能分解结束,设计信息被带到CAD系统低层.最后结合实例说明了该方法及其原型系统. 相似文献