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基于混合推理策略的半智能CAFD系统的研究与开发 总被引:4,自引:0,他引:4
针对半智能CAFD系统 ,提出一种基于知识与人类思维的混合推理策略。通过对基于规则、模型与案例推理的分析 ,给出了基于混合推理策略的半智能CAFD系统总体结构。对面向夹具设计的工件的特征表达、基于混合推理的夹具设计决策技术和夹具设计知识表示等关键技术进行了研究。给出了面向夹具设计的工件特征类层次结构 ,对夹具设计知识的表示进行了研究 相似文献
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针对航天大型薄壁件加工过程复杂,加工质量影响因素和加工质量缺陷之间难以建立精确关系的问题,提出一种基于案例推理的航天大型薄壁件加工过程质量追溯方法。首先设计了缺陷案例的表示模型,并建立了多层案例库组织和索引结构;然后提出一种案例综合相似度算法,采用层次分析法确定案例特征权重,并基于灰色关联分析进行案例相似度计算;最后通过案例检索匹配和修改,得到目标问题的质量追溯解决方案。该方法能够从大量历史案例中提取出最相似的案例,为加工质量问题的溯源分析提供决策支持,并通过运行实例验证了该方法的有效性。 相似文献
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为提高激光焊接试验的成功率,将基于案例推理(CBR)技术应用在激光焊接系统中。介绍了激光焊接系统的案例表示、案例检索(包括权重设定和相似度计算)以及实例检索,使用最近邻算法从案例库中找寻最相近的案例。实例表明,CBR技术能够有利于提高激光焊接试验的成功率。 相似文献
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针对基于实例的夹具设计中如何快速检索出相似实例的问题,提出了一种零件结构和工艺特征集合的有向工艺特征关系图概念,定义了有向工艺特征关系图同构属性的判定方法,并采用以零件结构特征和有向工艺特征关系图来构建夹具实例库.给出了零件工艺特征属性相似度计算方法,以零件工艺特征的关系及属性为特征,设计了面向零件结构和工艺特征的夹具实例检索算法.以变速杆零件为对象进行应用验证,证明了该方法在实际应用中的实用性和可行性. 相似文献
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为实现柔性夹具设计过程中的元件感知设计环境,辅助工艺员选件、尺寸驱动与自主装配,提出基于智能夹具元件的设计推理方法。在夹具布局设计完成的基础上生成工件本体,以工件本体模型推理智能柔性夹具元件选择,给出基础元件、支撑元件、定位元件与夹持元件的选件规则。利用工件功能特征与元件功能特征、元件之间的配合特征位置关系驱动智能元件的尺寸规格。利用预定义的装配模式推理元件配合关系,并实现元件之间的自动装配。通过开发柔性夹具设计系统,验证了智能夹具元件在设计过程中的有效性。 相似文献
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传统的夹具设计制造时需要大量的工时消耗和金属材料的消耗。快速组合夹具在许多方面克服了传统的夹具设计的缺点,极大提高了生产效率。随着机电产品向多品种、小批量、更新快的发展,有必要对其进行更深一步的研究。 相似文献
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Fixtures are tooling devices used to locate, support and hold workpieces during a manufacturing process. The major purpose
of a computer-aided fixture design (CAFD) system is to provide a fixture design based on fixturing principles and workpiece
information. Interference checking between the machining tool and fixture units, as well as between fixture units, is one
of the important functions of automated fixture design. This paper presents a fast interference checking algorithm for automated
modular fixture design validation. It is based on the study of the geometric characteristics of modular fixture components
and the machining tool. The fixture component model is simplified into a 2D contour model with height information. The tool-path
model is represented by a moving dot for 3-axis operations, or a moving line segment in 5-axis operations, as the fixture
component model is different from the popular collision detection procedure using swept volume and is more efficient for fixturing
verification. Application of this method will greatly reduce the computation complexity for fixturing interference checking.
The method is implemented with a CAFD system. An example is given at the end of the paper. 相似文献
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Haibo LIU Chengxin WANG Te LI Qile BO Kuo LIU Yongqing WANG 《Frontiers of Mechanical Engineering》2022,17(4):55
During the overall processing of thin-walled parts (TWPs), the guaranteed capability of the machining process and quality is determined by fixtures. Therefore, reliable fixtures suitable for the structure and machining process of TWP are essential. In this review, the key role of fixtures in the manufacturing system is initially discussed. The main problems in machining and workholding due to the characteristics of TWP are then analyzed in detail. Afterward, the definition of TWP fixtures is reinterpreted from narrow and broad perspectives. Fixture functions corresponding to the issues of machining and workholding are then clearly stated. Fixture categories are classified systematically according to previous research achievements, and the operation mode, functional characteristics, and structure of each fixture are comprehensively described. The function and execution mode of TWP fixtures are then systematically summarized and analyzed, and the functions of various TWP fixtures are evaluated. Some directions for future research on TWP fixtures technology are also proposed. The main purpose of this review is to provide some reference and guidance for scholars to examine TWP fixtures. 相似文献
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具有特征信息的三维孔系组合夹具元件库的建立 总被引:3,自引:0,他引:3
从组合夹具元件的功能出发,分析了夹具元件特征的具体定义,构成及分类;讨论了具有特征信息的三维孔系组合夹具元件库的建立方法;介绍了用ARX技术实现特征信息检索的关键程序,支持了夹具自动设计系统。 相似文献