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基于知识的CAPP中工艺知识管理与应用策略研究 总被引:2,自引:0,他引:2
通过对制造业工艺工作领域的调研,对制造企业在工艺设计过程中对CAPP系统的功能需求进行分析,总结制造企业工艺设计的共同特点,并以此为依据开发了基于知识的CAPP系统。本文对系统中的工艺知识在工艺方案设计和零部件工艺设计中的应用作了系统的研究,提出了一系列的实现办法。阐述了系统中知识管理的方法。分析了基于知识的CAPP系统的主要特点。 相似文献
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基于模型的工艺及其在零件加工工艺设计中的应用 总被引:1,自引:0,他引:1
《计算机集成制造系统》2014,(6)
针对当前基于模型的定义技术在工艺设计中的应用现状,提出了基于模型的工艺的概念,并以工序模型为基本单位,通过加工特征对工序模型信息进行组织,建立了基于模型的零件工艺管理体系。以工序模型为载体,建立了基于模型定义的零件工艺信息模型。提出一种三维加工方法标注符号,并对三维加工方法标注符号的组成进行了分析。开发了三维工艺信息标注模块,并以某零件三维标注为例,验证了所提方法的有效性。 相似文献
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随着我国"三农"政策的实施,我厂生产的大中轮拖拉机销量不断攀升,原有的工艺设计纲领已不能满足市场需求,提升我厂生产能力已成为推动企业快速发展的关键因素,而提高工艺设计的效率及正确性是提高生产能力必须解决的重要问题.为此,我厂引进了计算机辅助工艺设计(CAPP)系统. 相似文献
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在目前的版本管理系统中,主要提供面向文件的版本管理,把文件作为管理对象的核心,管理产品零件某个版本相关的各种数据,包括CAD模型、各种文档等。版本属性主要反映产品的外部属性信息,不能提供版本的内部知识以及文件之间在内容上的区别和联系。设计知识共享是企业开发新产品、增强竞争力的关键。根据版本设计信息,采用面向对象记述,建立版本知识体系和获取机制,并实现了一种基于设计知识的版本管理方法。 相似文献
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本文简要介绍了为某机械厂研究开发的—套计算机辅助工艺设计(CAPP)系统。该系统以VFP6.0为主要开发工具,界面友好,操作方便,使用后提高了工作效率.受到该厂工艺部门的欢迎。本文还介绍了CAPP系统的设计原则、软件开发平台和工具、工艺信息的查询等相关内容。 相似文献
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为解决摩托车振动问题,建立了基于知识的摩托车振动分析与控制的系统结构,提出了面向对象的知识表达的方法,建立了基于事例的推理和基于规则的推理的混合推理机制,结合具体实例进行应用研究,结果表明应用本系统可以有效地对摩托车振动进行分析与控制。 相似文献
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Process planning is the function within a manufacturing facility that establishes the machining processes and parameters to
be used so as to convert a piece-part from its initial form to the final form predetermined on an engineering drawing. Computer-aided
process planning (CAPP) has become a major focus of manufacturing automation as it forms the interface between computer-aided
design (CAD) and computer-aided manufacturing (CAM). Issues in CAPP include part representation, process selection, alternative
process-plan generation, intermediate surface and tolerance determination, and operation sequencing. This paper focuses on
quantitative models for determining cutting dimensions and tolerances for intermediate surfaces, and on a heuristic for sequencing
cutting operations. 相似文献
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为实现导管数字化集成制造模式,分析了导管数控弯曲过程中工艺知识的内容、特征及其存在形式,采用基于重用的方法将工艺知识分为两类:重用型工艺知识和决策型工艺知识;针对其内容结构特点,研究了工艺知识的表示与存储方法,建立了它们的关系数据库存储模型,进而构建了导管工艺知识管理系统的结构模型;研究了知识推理技术,建立了基于关系数据库技术的正向和反向推理方法,实现了导管工艺设计过程中的可加工性分析和制造资源选择;针对导管工艺的特点实现了基于实例的工艺参数设计(CBR),提高了导管数控弯曲工艺设计的效率。 相似文献
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基于知识的智能装配规划系统 总被引:6,自引:0,他引:6
为了保证装配工艺的合理性和实用性,提出了基于知识的智能装配规划方法。该方法利用联接件装配工艺的特点和知识,进行装配序列规划,建立了基于联接件知识的装配实例库,生成装配序列的途径有典型实例的匹配、标准实例的匹配和运用有向联接件知识的装配序列规划。为了使产品的装配周期最短,并提高装配系统的柔性和可靠性,提出了基于多代理的装配任务规划方法,该方法综合考虑了装配操作时间和装配工具变换时间等因素。 相似文献
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面向工艺设计的制造过程建模 总被引:8,自引:0,他引:8
基于工艺设计对产品制造成本、质量和效率的重要影响,提出了一种基于工艺设计的制造过程建模方法,以通过对过程模型的仿真,预测、分析和优化工艺设计效果。基于对制造过程的特征分析,采用面向对象的方法,首先将制造过程定义为一组成对象,并划分为制造活动、过程控制和制造资源3类成分对象,建立了制造过程类结构模型和动态过程模型。分别定义了工序类、制造资源类和过程控制类的类结构模型,以及各类对象的方法和属性。基于这些模型开发了一种计算机辅助工艺设计系统,可快速、自动地构建工艺设计定义的制造过程模型,并对过程参数(成本、时间)、切削加工、工件物流进行计算和仿真。 相似文献
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Agent technology for collaborative process planning: a review 总被引:1,自引:1,他引:1
W. J. Zhang S. Q. Xie 《The International Journal of Advanced Manufacturing Technology》2007,32(3-4):315-325
Agent technology has been considered as a promising approach for developing process planning systems and optimizing process
plans in a distributed environment. A number of researchers have attempted to use agent technology in process planning for
the purpose of integrating systems, tools and algorithms which are geographically distributed. In this paper, the historical
background of agent technology is systematically reviewed. A comprehensive review of agent technology and its applications
in manufacturing is presented including the applications of agent in scheduling, control, and enterprise integration and supply
chain management. The focus of the paper is on how agent technology can be further developed in the support of collaborative
process planning as well as its future research issues and directions in process planning. The current research directions
in computer aided process planning (CAPP) and issues in traditional CAPP approaches are also discussed. Three agent-based
approaches for process planning are presented. Finally, the key issues in developing agent-based collaborative process planning
systems are summarized. 相似文献
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D. Jovanoski H. Muthsam 《The International Journal of Advanced Manufacturing Technology》1995,10(6):404-410
Different concepts can be applied for representation of workpiece data for CAPP. Instead of waiting for future standards, a practical method is required, which can be used for actual workpieces or those that have been designed in the past by using already existing CAD systems. Therefore, for developing the CAPP system an approach has been chosen which consists of (1) a structure and geometry recognition of the workpiece and (2) an editor for technological data.This paper shows the main characteristics of a workpiece model which can be used for process planning. The results of an analysis of workpieces in industry give an overview of the topological relationships between geometrical elements which is an essential part of workpiece modelling for future design and planning systems. Also, a link between the workpiece model and the CAPP system is presented and briefly discussed. 相似文献
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A geometrical approach to computer-aided process planning for computer-controlled machine tools 总被引:6,自引:0,他引:6
A. M. Luscombe D. J. Toncich 《The International Journal of Advanced Manufacturing Technology》1996,11(2):83-90
This paper documents part of a research program which has been under way at the CIM Centre at Swinburne University of Technology since 1989. The purpose of the research program was to develop an open-architecture machine tool control system and then to see how that system could be used to change the distribution of traditional manufacturing design, planning and control functions. This paper examines one part of that research program and focuses on a methodology which could prove to be useful in the machine tool selection, cutter selection and cutter path generation phases of process planning for cutting operations on workpieces in computer-controlled machine tools.It is suggested that a configuration space transform be used for each cutter/machine tool combination to find the volume that the combination could remove from the uncut workpiece without removing any of the material that will form the final workpiece. A method of comparing these volumes from different combinations is then outlined. The output of this method is a reasonable sequence of machine tools and cutters. Path planning can then be carried out for each of the chosen combinations using a method similar to the one used to find the possible volume to be removed.Possible implementation techniques, and their limitations on existing computer hardware, are discussed and the most promising of these are identified, based upon some properties of configuration space transforms. 相似文献
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为实现自动化的装配序列规划,提出了一种应用面向对象和Petri网技术定义的产品装配模型.该模型由静态模型和动态模型构成.基于模型定义,提出了局部装配可行性的判定依据,并据此建立了一种基于静态模型的动态模型构造算法.该算法通过逐层分析可能状态的变迁,最终获得装配体所有几何可行的装配序列.通过实例验证了该建模方法的有效性. 相似文献