面向制造的箱体零件CAD/CAPP/CAM集成系统的研究与实现

CAD/CAPP/CAM集成是CIMS环境中一项极其重要的工程.本文在分析传统的CAD/CAPP/CAM集成系统的基础上,详细地叙述了面向制造的箱体零件CAD/CAPP/CAM集成系统的设计与开发.整个系统包括箱体零件的特征造型、制造性能评价、工艺设计及NC自动编程与仿真四个子系统.     

PDM平台下CAD/CAPP/CAM系统集成

阐述应用PDM作为集成平台 ,实现对CAD、CAPP、CAM ( 3C)的系统集成。在此基础上对基于特征技术的CAD/CAPP/CAM集成体系结构进行分析和探讨     

基于特征的CAD/CAPP/CAM集成方法的研究与应用

对CAD/CAM/CAPP系统的结构及CAM工艺信息处理流程进行了分析。对Pro/E进行二次开发 ,实现了CAPP与CAD/CAM的无缝连接 ,完成零件的自动加工过程仿真和NC代码生成 ,大大减少了技术人员的工作量。实际应用表明 :此方法集成度高 ,柔性大。     

楔横轧模具CAD/CAPP/CAM集成系统的研究

详细阐述了楔横轧模具CAD/CAPP/CAM集成系统开发的总体思想及各主要功能模块的开发机制.应用特征技术构造了不同模块间模具特征信息模型,从而实现模具信息在不同状态空间的信息转换及传递,保证了系统整体信息集成.     

基于特征的零件信息模型

特征建模技术是CAD/CAPP/CAM集成的关键技术之一,特征模型使CAD、CAPP、CAM等系统共享统一的产品模型成为可能。文章介绍特征的概念和分类以及基于特征的零件信息模型的结构和构造方法。     

CIMS系统中CAD/CAPP/CAM集成研究

探讨CIMS中 ,在网络环境下 ,采用并行工程的思想 ,基于特征建模的CAD/CAPP/CAM的系统集成 ,因为它是CIMS系统的核心 ,这有利于制造系统的整体集成。     

CAD/CAM集成中产品定义模型研究与应用

产品定义数据(PDD)是定义产品性能、结构及制造要求等的产品内部数据,是CAD/CAPP/CAM的研究对象,也是 CAD/CAPP/CAM集成的基础。本文提出了基于特征的产品定义模型,通过统一的产品定义模型,驱动各应用子系统。介绍了研制的回转体零件的特征库、产品定义模型和数据结构,并以中性文件的形式输出产品信息,实现了CAD/CAPP的集成.     

应用STEP和STEP-NC实现CAD/CAPP系统集成

CAD和CAPP系统的集成一直是一个研究中的难题，其原因在于由于信息表达的不一致，使CAPP系统需要针对不同的CAD系统设计专门的信息提取模块，而对于CAPP下游来说，CAM也不能利用全部的产品设计和工艺信息。STEP标准作为CAD系统的输出，可以为OAPP系统提取信息提供一个统一的接口。而STEP—NC作为新一代数控标准，继承了STEP标准的属性，可以作为CAD／CAPP／CAM／CNC集成的桥梁。应用STEP中性文件，CAPP提取产品的制造特征和加工工步，生成工艺文件，并以STEP—NC中性文件形式输出，便于后续CAM和CNC系统的调用，从而达到CAD／CAPP／CAM／CNC信息集成的目的。     

CAD／CAPP／CAM系统中的图形数据库开发

阐述零件图形数据库开发原理和方法,解决CAD/CAPP/CAM系统中零件设计和制造信息处理、传递的关键问题.将类零件设计和制造信息定义为设计特征、管理特征、工艺特征,借助交互式参数化设计方法进行特征识别,构造零件设计模型、管理模型、加工模型,从而建立供CAD/CAPP/CAM系统使用的类零件图形数据库.     

整体式刀具CAD/CAPP/CAM集成系统的设计与实现

计算机辅助设计与制造技术（CAD/CAM）在制造业的各个领域中发挥着越来越重要的作用,为提高整体式刀具的设计和制造效率,对整体式刀具CAD/CAPP/CAM集成的理论和方法进行了研究和探索,并在此基础上开发了基于Pro/E的整体式刀具CAD/CAPP/CAM集成系统。     

Extraction/conversion of geometric dimensions and tolerances for machining features

It is important for a feature-based system to preserve feature integrity during feature operation, especially when feature interaction occurs. The paper presents a feature conversion approach to convert design features used in a design model into machining features for the downstream applications. This process includes both form features (geometric information) and non-geometric features conversion. Most researchers have concentrated on geometric information extraction and conversion without tackling the important problem of non-geometric feature information. This paper focuses on the extraction and conversion of feature geometric dimensions and tolerances (GD&T) for downstream machining application.The main barrier to the integration of a feature-based CAD/CAPP/CAM system – feature interaction – is discussed in this paper, which alters design features in their geometries and non-geometric information. How to identify and validate these feature dimensions and tolerances is one of the key issues in feature interaction conversion. The development of robust methodologies for preserving feature integrity for use in process planning application is the main thrust of the work reported in this paper.     

基于特征实体模型上的截面轮廓自动特征识别方法

复杂零件特征实体上的相交特征自动识别问题，仍是CAD／CAPP领域未解决的难点。本文提出了基于特征实体模型上的截面轮廓造型自动特征识别方法，并制定了一系列各类特征的合理识别规则和识别算法。这种方法探索了一条实现自动特征识别的新途径，实现了对复杂箱体类零件的加工加工特征自动识别与信息自动提取，从而实现了CAD／CAPP系统的信息自动传递。     

基于中介信息元的CAD／CAPP信息集成技术研究

提出了中介信息元的概念,利用零件的几何面在CAD和CAPP系统中的一致性,为零件模型的几何构造了信息对象模型来作为形位公差,表面粗糙度,加工基准等非几何信息的载体,为解决单纯以特征为非几何信息载体时无法实现上述信息从CAD系统向CAPP系统的完整传递的问题提出了一种可行的方法。根据CAD系统传递的零件几何信息以及中介信息元库中保存的非几何信息,CAPP系统就能够实现制造特征的识别,加工方法的推理,加工余量推算,工序图生成等模块,使CAD／CAPP的真正集成成为可能。     

Product and manufacturing capability modelling in an integrated CAD/process planning environment

Computer-aided process planning (CAPP) is one of the key components in computer integrated manufacturing (CIM) environment. Fully automatic CAPP systems require information transfer between CAD/CAM systems to be mutual, dynamic, concurrent, automatic and efficient. The difficulty in achieving this is the management of the vast amount of heterogeneous data, knowledge and complicated inference processes encountered in developing automatic planning systems. The objective of the reported research is to develop a framework for modelling and managing engineering product and manufacturing capability information in an integrated feature-based CAD/knowledge-based process planning environment. The feature-based design system is developed with a commercial boundary representation (Brep) solid modeller with additional feature-modelling functions. The process planning system is developed using a knowledge-based system, which is fully integrated with the design system through an information mapping mechanism. Process planning decisions are made by searching for a match between the product requirements and the process capability of available manufacturing systems. This is achieved by invoking the rules coded in an inferencing mechanism (an inference engine). Both the underlying methodologies and the implementation aspects will be addressed in this paper.     

基于Internet的CAD/CAPP/CAM/ERP信息集成系统的研究

基于Internet的CAD/CAPP/CAM/ERP应用系统信息集成有助于跨部门、跨企业、跨行业和跨区域的协同设计、制造以及动态联盟 ,是产品信息一体化的核心技术。通过对目前分布式系统集成方案的比较 ,在对各子系统之间集成关系和方法分析的基础上 ,设计了基于XML和Web服务技术的新型的CAD/CAPP/CAM/ERP应用系统信息集成构架。探讨了系统实现中应解决的XML实体构架、Web服务的实现、系统的集成接口等关键技术 ,同时将JAXM技术和SOAP技术紧密结合来优化对XML信息的传递、交换。该集成方案以灵活的数据模式、可重用的服务模块、易扩展的数据接口有效地、可靠地解决产品在网络中设计、生产、制造和销售过程中信息的交换和共享 ,实现产品交易的信息化、智能化、集成化 ,以更快的速度、更高的准确度和更出色的客户服务满足客户个性化的需求     

Form Feature and Tolerance Transfer from a 3D Model to a Set-up Planning System

Currently, most CAD systems, even the feature-based design systems which were developed for CAPP, cannot provide exact information about an object (e.g. dimensions and tolerances). Some feature-based design systems can provide product data directly or indirectly; however, most CAPP systems still do not have an interface with CAD systems. The product data required by CAPP systems usually has a specific format which is unique to the system. In a CAPP system, it is essential for set-up planning to ensure the precision of the machining processes. Therefore, it is necessary to develop an interface with CAD models, so that the part data file can be obtained directly from the CAD representation. This paper proposes an approach for integrating the set-up planning system with a feature-based CAD system. By using an object-oriented approach – Product Data Translator (PDT), the computer-automated extraction of geometry and complete tolerance information was achieved; and the automated generation of the tool approach direction was developed. RID=" ID=" <E5>Correspondence and offprint requests to</E5>: H.-C. Zhang, Department of Industrial Engineering, Texas Tech University, Lubbock, TX 79409&ndash;3061, USA. E-mail: hzhang&commat;coe.ttu.edu     

Indexing and retrieval in case-based process planning for multi-stage non-axisymmetric deep drawing

This paper presents a case-based reasoning (CBR) methodology for computer-aided process planning (CAPP) for multi-stage, non-axisymmetric sheet metal deep drawing. The methodology addresses the indexing and retrieval of process planning cases. Planning cases are indexed via a feature-based representation of deep drawn parts. Efficient case retrieval is achieved by a feature-based similarity analysis between a new deep drawn part and existing parts in the case library. An illustrative example is included to demonstrate the operation of the proposed approach and show its effectiveness in speeding up CAPP for multi-stage non-axisymmetric deep drawing. This revised version was published online in April 2005 with a correction to the corresponding author’s address.     

基于资源模型和特征模型的创成式CAPP系统的研究

通过对制造资源和零件信息的研究,建立了规范化的制造资源模型和基于特征的零件信息模型,同时研究了基于这两个模型的创成式ＣＡＰＰ 系统的工作原理,提出了决策数据和决策机制相分离的系统结构,解决了ＣＡＰＰ系统的通用性问题     

特征造型系统中的参数化设计技术应用研究

特征造型技术是实现ＣＡＤ／ＣＡＰ／ＣＡＭ集成的关键技术之一，其先进性要求它除了信息完备以外，还应与参数化设计技术有机结合起来，从而实现已建模型的动态修改，提高设计的自动化程度。本文介绍了在一个特征造型系统中参数比设计技术的具体应用与方法。     

基于遗传算法的计算机辅助工艺计划工序决策优化

加工中心在加工复杂零件时,工序复杂,工步多,其顺序直接影响加工质量和工作效率.针对数控加工中心零件加工工步的排序问题,提出了特征排序.以辅助加工时间最短为优化目标,采用数学中的最优化原理,利用惩罚函数建立相关数学模型,并基于遗传算法来解决工艺加工过程的排序问题.将为具体的工程实践起到指导作用.