基于知识的级进冲模工步排样CAD技术的发展与展望

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。     

级进模智能CAD/CAM原型系统CAMSLS

介绍了新一代基于集成信息模型的级进模智能 CAD/CAM系统— CAMSLS。它采用面向对象的方法来描述基于特征和知识的冲压件集成信息模型 ,综合运用RBR、CBR、ANN等 AI技术 ,实现了造型过程的并行工艺性评价、单特征工艺方案的生成及高度自动化的工步排样 ,及在基于事例推理和参数化标准模具库技术基础上得到模具设计实例 ,输出工程图纸和 NC代码。对集成信息模型、工步排样和模具结构设计等做了进一步阐述 ,对 CAMSLS系统的先进性做了综合性评价     

级进模智能CAD／CAM原理系统CAMSLS

介绍了新一代基于集成信息模型的级进模智能ＣＡＤ／ＣＡＭ系统－ＣＡＭＳＬＳ。它采用面向对象的方法画描述基于特征和知识的冲压件集成信息模型,综合运用ＲＢＲ、ＣＢＲ、ＡＮＮ、等ＡＩ技术,实现了造型过程的并行工艺性评价、单特征工程方案的生成及高度自动化的工步排样,及在基于事例推理和参数化标准模具库技术基础上得到模具设计实例,输出工程图纸和ＮＣ代码。对集成信息模型、工步排样和模具结构设计等做了进一步阐述,对     

级进模工步排样中的组合优化问题研究

级进模工步排样是级进模设计的核心 ,理论上属 NP完全问题。本文在分析一般优化方法的基础上 ,将模拟退火算法应用于工步排样 ,建立了组合优化数学模型 ;同时运用层次分析法获取多目标优化函数的权值向量 ,并通过知识引导有效地提高了算法效率。实际应用表明 ,模拟退火算法在优化结果上明显优于常规方法 ,为智能级进模系统实现工步排样优化探索了一条有效途径。     

黑板原理在级进模工步排样方案构造系统中的应用研究

首先对黑板原理及相关技术进行了简单阐述。全文着重介绍了构造复杂级进模工步排样方案生成系统中，黑板模型的建立，并论述了该模型的推理机制。随后，还介绍了黑板结构的实现，通过原型系统的开发，论证了该理论在系统实现中的合理性和优越性。     

引线框架冲裁级进模工步排样CAD系统

介绍研制开发的集成电路（ＩＣ）引线框架多工位冲裁级进模工步排样ＣＡＤ系统及其应用实例。结出建立该系统的数学模型、数据结构以及能自动完成工步排样优化设计的方法。     

链板级进模概念设计的CAD实现

级进模的概念设计体现了模具设计的战略思想,是级进模CAD系统开发的难点和关键技术.本文应用工程优化技术和模糊推理技术实现了链板级进模的概念设计,充分贯彻了基于工艺和并行设计思想.给出了基于工艺的优化排样建模方法、应用模糊推理技术对跳步排样方案实施模糊决策的CAD实现策略及其实现原理.     

基于图论的高精度级进模跳步排样优化算法

跳步排样是高精度级进模ＣＡＤ中的重要组成部分。提出一种基于图论的跳步排样优化算法。利用工艺规则，通过起始关键点的获取，最少工步数的确定，到排样的优化，来保证级进模的工作精度。     

基于事例推理技术的涡轮叶片精铸模分模设计研究与应用

飞机发动机涡轮叶片的内部结构相当复杂，这给叶片模具的分模设计带来了很大的困难。通过对传统手工分模设计过程的分析，并针对分模设计经验依赖性强的特点，指出基于事例推理的分模设计方法的可行性，构建了基于事例推理的涡轮叶片分模设计系统框架，解决了分模设计的分模知识提取、分模事例描述、分模事例检索、分模事例修改等关键问题。最后给出了系统运行实例，表明能够提高设计效率，减少设计难度。     

前组合灯下安装支架多工位级进模设计

通过对前组合灯下安装支架的冲压工艺性及冲压工艺方案的分析,与单工序冲压模进行比较,确定了采用12工位级进模来进行制件成形的冲压工艺方案。随着工艺方案的实现,模具充分利用工件本身的结构特点,采用了自动卸料、出料冲裁,模具在压力机一次行程中完成自动送料、冲孔、成形、翻边、分离等工序。试冲结果表明,提出的排样方案和设计的12工位级进模是合理可行的,能满足大批量生产需要。     

基于实例推理的拉深工艺设计系统

介绍了应用基于实例推理技术建立的拉深工艺设计系统,详细介绍了拉深工艺设计实例的表达和组织方法以及实例的匹配机制和相似实例的调整策略。     

New algorithm for CBR-RBR fusion with robust thresholds

The case-based reasoning(CBR) and rule-based reasoning(RBR) fusion systems include a diverse range of fusion methods and their tasks are characterized by interleaving combination of the reasoning procedures. Existing approaches cannot clarify the complex relationships between data from the knowledge sources nor uniformly represent the heterogeneous case and rule knowledge in one fusion space. As a result, existing approaches fail to solve system fragility due to knowledge uncertainty and reasoning unreliability. For the purpose of addressing the difficulties, a novel algorithm for CBR-RBR fusion with robust thresholds(CRFRT) is proposed. Heterogeneous case and rule knowledge are uniformly represented in one defined fusion unitary space. The robust thresholds have been achieved to distinguish the complex relationships between meta-knowledge in the fusion space and to enhance system capacity of knowledge identification. Furthermore, fusion reasoning strategies are constructed for CRFRT and its procedure based on which robust solution of the fusion reasoning problem is obtained. Finally, CRFRT is validated by benchmark problems in machine learning. Compared with other CBR and RBR approaches, the reasoning efficiency and accuracy are increased by 5% and 2.2% respectively. The variations of system accuracy are decreased by 2% to 3.8%. The above results show that the CRFRT algorithm boosts the system’s effectiveness and robustness. The proposed CRFRT can solve the fragility of complex intelligence decision system and give quality performance for fault diagnosis.     

结合BFO及CBR的层流冷却水量优化设定方法

层流冷却过程控制目标是保证带钢卷取温度进入目标范围内并尽量提高精度以保证带钢质量,其本质是目标优化问题。同时,层流冷却过程处于频繁变化操作工况的动态环境之下,现有控制方法很难实现有效的实时控制。本文针对现有层流冷却过程控制方法很少引入优化思想这一问题,提出基于改进菌群优化算法(BFO)的层流冷却过程冷却水量优化设定方法。并针对动态变化工况,引入案例推理(CBR)机制,提出离线优化——在线推理双层结构的动态优化设定控制结构。基于实际运行数据的实验结果说明,本文提出的方法能够有效搜索冷却水量的优化设定值,而且在变更带钢规格的变化工况条件下,能够及时调整冷却水量的设定值,最终使带钢卷取温度进入目标范围内。     

DESIGN TECHNOLOGY FOR INJECTION MOLD PARTING SURFACE BASED ON CASES AND KNOWLEDGE

On the basis of the comprehensive analysis about the automatic generation of the injection mold parting surface,the parting surface design method which introduces knowledge and case-based reasoning (CBR) into the computer-aided design is described by combining with the actual characteristic in injection mold design,and the design process of case-based reasoning method is also given.A case library including the information of parting surface is built with the index of main shape features.The automatic design of the mold parting surface is realized combined with the forward-reasoning method and the similarity solution procedure.The rule knowledge library is also founded including the knowledge,principles and experiences for parting surface design.An example is used to show the validity of the method,and the quality and the efficiency of the mold design are improved.     

Research of knowledge-based system for stamping process planning

This paper gives a brief introduction to establishing a knowledge-based system for intelligent stamping process planning. Studies on the system’s framework, knowledge model and reasoning mode are introduced. Some key technologies such as the feasibility of the stamping process, an optimal algorithm for blank layout, intelligent strip layout and force calculation are researched. The efficiency of stamping process planning can be improved by the system.     

A Case-Based Computer-Aided Process-Planning System for Machining Prismatic Components

This article deals with a process-planning system that uses case-based reasoning methodology. Briefly, case-based reasoning is an intelligent problem-solving technique which works by searching through a database for previously solved problems for one or more cases whose identifying features closely resemble the current problem. The case-based reasoning system used in this article to develop a process plan, typically consists of three modules, i.e. the part input and representation module, the case retrieval, and case adoption module. In this paper, new approaches have been proposed in all three modules. By incorporating a multiparametric and absolute-matching technique, the case retrieval module especially has become more powerful. A practical approach has been suggested in this research to compute the similarity between part input and case. An illustrative example is included to demonstrate the proposed system.     

基于知识的汽车发动机故障诊断系统的开发

阐述了基于知识的汽车发动机故障诊断系统的原理.总结了汽车发动机故障诊断专家的经验知识.依据基于知识的诊断推理原理,采用产生式规则和框架的知识表示方法,选取深度优先的搜索策略,实现汽车发动机的故障诊断.     

基于事例推理的装配顺序规划研究

就现有的计算机辅助装置顺序规划研究中存在的不足，提出基于事例推理（ＣＢＲ）的装配顺序规划思路，研究基于ＣＢＲ的装配顺序规划中的关键技术，开发出产品装配分析原型系统ＰＡＡＳ。系统包含装配数据建模，装配顺序规划和综合ＤＦＡ分析等功能。结合原型系统实例讲解基于ＣＢＲ的装配顺序规划的实现方法。