共查询到19条相似文献,搜索用时 125 毫秒
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研究了基于知识的级进冲模工步排样CAD技术,分析、总结了基于模型和基于规则两种工步排样设计知识的处理方式,提出了将基于知识的工程(KBE)思想引入工步排样设计领域的方法,并建立了系统框架。 相似文献
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基于KBE的工程设计——理论、方法与实践 总被引:24,自引:1,他引:24
工程设计是一个知识驱动的创造性过程 ,KBE技术是促进工程设计智能化的重要途径。本文提出了 KBE的定义 ,分析、总结了 KBE与 CAD、专家系统等的区别 ;提出了基于 KBE的工程设计方法 ,并按设计知识的几何相关性 ,对知识处理的工具与方法进行分类 ;介绍了 KBE技术的应用现状 ,并以冲压模具设计为例建立了基于 KBE的设计系统框架。 相似文献
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四、冲模类型及其结构 冲制板料弯曲件的冲模,绝大多数为单冲模和连续模,复合模使用较少。近年来,随着冲压技术的迅速发展,特别是冲模设计与制造技术的提高,原有冲模正逐步为高精度、高效率、高寿命的“三高”多工位连续模所取代。这种冲模依其结构与动作特点有如下几种类型: (1)工位沿送料方向直线布置,采用携带法实现工位间送进,弯曲件的冲弯只需沿冲压方法施力 相似文献
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冲模作为一种加工工具具有生产效率高、节约原材料等特点,但其制造多为单件小批量生产,故冲模成本较高。降低冲模成本的主要手段是提高冲模的寿命。冲模寿命是以冲出合格冲件的冲裁次数来衡量的,它分为刃磨寿命即冲模每修磨一次能冲裁的次数,和总寿命即冲模报废前能冲裁的总次数等两种。影响冲模寿命的因素较多,本文提出一些提高冲模寿命的方法与同行共同探讨。 相似文献
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多点冲模技术是一种新颖的金属板材加工模具制造技术,属柔性冲模。所谓柔性冲模是指这种冲模在结构上具有一定的柔性,虽然它只是一副冲模,但它可以通过快速调整而使之产生出形状不同的多种冲压零件。这种冲模特别适合于多品种小批 相似文献
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本文针对冲模CAD/CAM系统的特点,阐述了利用DBASE系统建立冲模数据库,并根据(.dbf)文件的内部结构,阐述用高级语言直接访问DBF的方法和应用实例。 相似文献
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本文针对冲模CAD/CAM系统的特点,阐述了利用DBASE系统建立冲模数据库,并根据<.dbf>文件的内部结构,阐述用高级语言直接访问DBF的方法和应用实例。 相似文献
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舒雨锋 《机电产品开发与创新》2011,24(1):79-80,68
产品的设计是其迅速投入市场的关键,KBE系统的实现可以大大优化产品的设计方法,缩短设计开发周期.本文以蒂凡尼灯具产品为基础,以Rhinoceros为开发平台,深入研究了KBE技术,以及提出利用逆向工程技术实现实例库的建立和基于实例推理机制的实现,构造出灯具设计KBE系统构架,利用RhinoScript程序和ADO技术,... 相似文献
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基于KBE门式启闭机的快速设计技术 总被引:1,自引:0,他引:1
分析了门式启闭机结构和传统设计过程,针对传统设计方法存在的问题,提出并研究了基于KBE门式启闭机快速设计技术,主要包括CAD和CAE集成技术、基于KBE参数化建模技术、基于KBE门式启闭机快速设计框架以及门式启闭机快速设计的流程。通过集成CATIA和ANSYS软件,以及运用数据库技术和编程语言VC#.NET开发了门式启闭机快速设计系统。 相似文献
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网络化KBE系统框架研究 总被引:4,自引:0,他引:4
KBE技术是近年来在产品设计领域的研究热点之一,它是下一代智能化CAD系统的核心技术。在研究KBE的内涵的基础上,结合网络技术和数据库技术,讨论了网络化KBE系统的体系架构和系统的知识流向以及实现系统的关键技术。结合起重机的设计实践,开发了网络化的KBE系统。 相似文献
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Shengwen Zhang Guicheng Wang Liang Zhang Xifeng Fang 《Frontiers of Mechanical Engineering in China》2009,4(1):97-102
To promote the research and development of modern digital and intelligent manufacturing technology and overcome shortcomings
of computerized numerical control(CNC) programming for complex components, an innovative idea has been proposed to introduce
knowledge based engineering (KBE) into the field of CNC programming within the integrated environment of CAD/CAPP/ CAM. This
paper constructs the architecture of CNC programming based on KBE within CAD/CAPP/CAM and explores the key technology of applying
KBE to CNC programming — knowledge representation, knowledge acquisition, knowledge reasoning, and generalized knowledge base
system of CNC programming. The integration of the CAD/CAM system and the CAPP system of enterprises has been achieved by taking
the powerful CAD/CAM system of UG NX as a platform. The prototype system of CNC programming for complex components based on
KBE within CAD/CAPP/CAM has been developed by means of UG/Open,VC ++ 6.0, and SQL Sever 2000. Finally, a frame example, one
of the complex components of a marine diesel, is presented, and the academic production and the intelligence of the system
are verified. 相似文献
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目前梁结构类型产品的配置开发仍然停留在零部件级,这种零部件级的固定配置往往很难满足企业对多种产品型号的需求。结合KBE(knowledge based engineering)技术,利用NX软件和Visual Studio对其特征级的配置开发展开研究。首先,将梁结构类型产品单元化处理,并设计了一种控制其在三维空间自由度的方法,建立了单元模型库。其次,根据KBE开发框架完成二次开发,以更灵活和自动的方式生成梁结构类型产品模型,与传统参数模型相比,基于知识的库可以产生更多的几何拓扑变化。最后,以某梁结构为例验证,表明该技术对提高梁结构类型产品设计质量和设计效率具有重要意义。 相似文献
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KBE-based stamping process paths generated for automobile panels 总被引:1,自引:2,他引:1
Jinqiao Zheng Yilin Wang Zhigang Li 《The International Journal of Advanced Manufacturing Technology》2007,31(7-8):663-672
As automobile body panels are one kind of sheet metal part with groups of free form surfaces, the process planning is more
complicated than common sheet metal stamping to implode effectively and practically. Based on KBE, new frameworks have been
presented as intelligent master model at the system level and as procedure model at the activity level. In accordance with
these frameworks, an intelligent CAPP system has been specifically developed. Based on feature technology, features have been
extracted and represented by the object-oriented method. Stamping features and their parameters have been defined and extracted
based on feature technology and stamping process rules. The whole product knowledge has been represented by frames which directly
map to objects (or features) in the object-oriented sense. Relevant appropriate operations features have been assigned to
stamping features of a product based on feature-operation criteria, parameters of the stamping feature and their correlativity.
This assignment is a decision-making activity using a set of rules with a decision-making tree and model-based reasoning methods.
With knowledge between operations, such as operations order constraint (do-after) and operations combination constraint, process
paths have been improved based on relevant intelligent reasoning methods. Based on the relationships (preferred-to) between
processes and machines/dies, the structure of die and machine for each process can be identified, since the process route
has been determined. In this stamping process planning, the procedure and information have been controlled by a process control
structure that is associative and integrated. 相似文献
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