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介绍了一个非回转体零件的工艺设计专家系统,讨论了系统的组成,基于特征的零件建模方法,工艺知识库的构造及推理机制问题。系统可由CAD系统输入零件的有关信息,自动进行零件的工艺规程设计。 相似文献
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介绍了一个非回转体零件的工艺设计专家系统,讨论了系统的组成,基于特征的零件建模方法,工艺知识库的构造及推理机制问题。系统可由CAD系统输入零件的有关信息,自动进行零件的工艺规程设计。 相似文献
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基于实例推理和专家系统的综合工艺决策方法 总被引:7,自引:0,他引:7
将基于实例的推理和专家系统创成法相结合,构造了一个实用的综合工艺路线决策方法。实例的推理是根据结构和工艺的相似性,按特征矩阵和进级匹配提取最相似实例,对相似实例的工艺进行变异设计,即可完成新零件的工艺过程设计;专家系统创成法是由专家系统的推理机依据知识库和信息库进行推理决策,自动创成得到零件的机械加工工艺过程。该方法非常适用于多品种、小批量生产类型的机械制造厂进行零件的机械加工工艺过程设计。 相似文献
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基于零件特性表和关键机床的工艺实例检索 总被引:7,自引:2,他引:7
针对基于实例推理的CAPP系统中的工艺实例提取,提出了一种基于零件特性表和关键机床的工艺实例检索提取方法,阐述了应用该方法进行工艺实例检索的原理和过程,定义和构造了零件特性表,详细介绍了基于零件特性表进行工艺实例快速检索,以及基于关键机床启发信息进行工艺实例详细检索的方法。 相似文献
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夹具是一种在加工过程中能准确稳定地定位及夹紧加工工件的工艺装备,好的夹具设计方案能提高产品质量和生产效率.针对目前客户需要产品零件干变万化的背景,夹具快速设计系统具有重要的研究意义.本文利用Visual Basic对SolidWorks进行二次开发,采用基于规则推理技术(RBR)及基于实例推理技术(CBR)的混合推理技术,开发了一种槽系组合夹具CAD系统.通过集合两种推理技术的优点,在夹具设计过程中,强理论部分运用RBR,具有推理能力强、推理效率高的优点;而在弱理论部分则运用CBR,检索过去的类似设计案例,从而快速完成组合夹具设计,系统具有较高的实用价值. 相似文献
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利用VisualBasic可视化编程技术建立了回转体零件工艺规程设计专家系统HCAPPEXPS ,经检验 ,系统运行稳定可靠 ,知识库维护扩充方便 ,操作界面友好 ,可满足一般回转体零件工艺规程设计自动化的要求 相似文献
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《Computer Integrated Manufacturing Systems》1995,8(3):173-184
Process planning establishes the methods and means of converting the raw material into a finished part. The planning function interacts with the manufacturing system through (a) the design specification, (b) manufacturing resources, and (c) the process plan. Similarly, computer aided process planning (CAPP) establishes the links with its application environment through the analogous models. Though much attention is paid to the modelling of the part and manufacturing resources, modelling of the process plan has been an ignored topic to-date. The present paper discusses the need for modelling the process plan, and proposes a framework for process plan internal representation (PPIR) for the effective integration of CAPP and CAM functions. The implementation of the proposed framework in GIFTS — a CAPP system for rotational parts — is also discussed. 相似文献
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A Dynamic Programming Based Process Planning Selection Strategy Considering Utilisation of Machines 总被引:1,自引:0,他引:1
H.-C. Chang F.F. Chen 《The International Journal of Advanced Manufacturing Technology》2002,19(2):97-105
Computer-aided process planning (CAPP) has been recognised as a key element in computer-integrated manufacturing (CIM). Despite
the fact that tremendous efforts have been made to develop CAPP systems, the benefits of CAPP in real-life manufacturing environments
are not obvious. One of the main difficulties in applying CAPP in real manufacturing settings is the missing link between
generated process plans and shop-floor activities. The assumptions that the shop floor remains static and there are unlimited
resources available have caused a typical CAPP system to make a repetitive selection of the same most desirable machines for
manufacturing different parts. When process plans for various parts are finally sent to the shop floor, process bottlenecks
normally arise, making the generated plans ineffective.
Some efforts have been made in the integration of process planning and shop floor activities; however, the problems associated
with the lengthy time and impractical attempts at the generation of process plans, remain unsolved. Since in most cases, it
is possible that several alternatives exist for machining a part by using different equipment, a stage-type network structure
can be constructed. This paper introduces a dynamic programming based process plan selection strategy, enabling the efficient
solution of this stage-type network prob-lem. In this proposed strategy, the use of workstations is also taken into consideration
so that the resulting plan is valid for the conditions that exist on the shop floor at the time an order is released. A case
study has been provided to substantiate the effectiveness of this proposed strategy. 相似文献
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介绍一个CIMS或FMS环境下的集成化CAPP系统-THCAPP,该系统以非回转体零件为加工对象,利用IGES实现与CAD/CAPP/CAM的信息集成。工艺路线生成核心是创成式专家系统,推理机的控制策略以启发式搜索的估价函数为主,可自动选择定位夹紧面。工艺知识库为独立的、可维护的形式,根据CIMS车间的实际环境可获得多种工艺方案。 相似文献
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Dr Rui-Rong Wu He-Ming Zhang 《The International Journal of Advanced Manufacturing Technology》1998,14(6):406-411
Set-up planning is not only a key element of computer-aided process planning (CAPP), but also a key factor for the integration of CAPP with computer-aided fixture planning (CAFP) and production planning and scheduling (PPS). In this work, an object-oriented and fuzzy-set-based approach is developed for set-up planning. Object-oriented technology is employed to represent set-up planning knowledge and generate alternative set-ups which can respond to the dynamic manufacturing resource and facilitate the CAPP/PPS integration. Based on fuzzy-set theory, a fuzzy evaluation function is proposed to produce optimal set-ups. Combined with a real project, a set-up planning system is developed to generate alternative and optimal set-up plans for the machining of prismatic parts. 相似文献
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现代CAPP技术及其发展研究 总被引:12,自引:0,他引:12
企业信息化工程推动了CAPP技术的发展和应用,本文通过CAPP的发展过程、信息技术的发展以及企业信息化工程对CAPP的需求等进行深入分析,从体系结构、系统功能、信息组织、工艺设计模式、系统性能等方面分析了现代CAPP技术的发展趋势。(1)CAPP系统的体系结构由单机模式、C/S模式向C/S模式与基于Web技术的B/S模式相结合、组件化、层次结构化方向发展;(2)CAPP系统的功能覆盖企业整个工艺领域,向集成化制造数据管理方向发展;(3)工艺设计模式向基于知识的分布协同决策的综合智能化设计技术发展;(4)CAPP的应用更加强调系统的集成性和开放性等。文中还简要介绍了相关关键技术。 相似文献
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多转子系统弯、扭耦合作用时临界转速的研究 总被引:3,自引:2,他引:3
导出了轴的弯、扭耦合传递矩阵和轴间的弯、扭耦合矩阵。在文[1]的基础上编制了多转子弯、扭耦合临界转速的通用程序。采用等效刚度、等效阻尼方法编制了多转子弯、扭耦合稳态不平衡响应的通用程序;研究了扭振、畸形结构、油膜刚度、油膜阻尼等因素对临界转速的影响;并对某型发动机转子进行了计算和分析 相似文献
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APPROACHTOINTEGRATEDPROCESSPLANNINGSYSTEMARCHITECTUREAPPROACHTOINTEGRATEDPROCESSPLANNINGSYSTEMARCHITECTUREYanJunqi;LuoLinhuaS... 相似文献