面向对象的CAD／CAM集成技术的研究

将面向对象方法应用于ＣＡＤ／ＣＡＭ集成的研究，提出面向对象的ＣＡＤ／ＣＡＭ集成的思想和方法；利用面向对象方法建立够集成产品设计和制造信息的产品定义模型－面向对象的产品定义模型，集成表达零件的设计，工艺规划，数控编程等活动所需信息，在此基础上开发ＣＡＤ／ＣＡＭ集成系统。介绍利用该思想方法所开发的回转类零件ＣＡＤ／ＣＡＭ集成系统。     

An integrated intelligent process planning system for prismatic parts using PC-based CAD and CAM software packages

Traditional machining process planning relies heavily on human decision making and manual calculations. The utilisation of CAM software and computers to aid machining reduces errors and planning time. A fully integrated planning system using CAD and CAM software would further increase the efficiency of process planning. The goal of this research is the automation of machining process planning for prismatic parts by integrating Autocad and Mastercam software packages using the Autolisp programming language and artificial intelligence techniques. Using only a 3D representation of the prismatic part geometry drawn in Autocad as input, the integrated system will be capable of producing NC code for the machining of the part with minimal human intervention. This system would greatly enhance the productivity of machining process planning.     

A feature-recognition knowledge base for process planning of rotational mechanical components

A computer-aided process-planning (CAPP) system is a key factor in CAD/CAM Integration. In recent years, expert-system techniques have been introduced into this area. An increasing number of AI-based generative process-planning systems have been developed to automate machine process selection and tools selection. Of these, EXCAP, an integrated knowledge-based system developed at UMIST, distinguishes itself by its flexibility and ease of use. This paper gives an overview of EXCAP and focuses on the feature-recognition knowledge base.     

集成环境下特征基工艺过程设计系统

介绍集成环境下的飞机结构件数控加工的工艺过程设计系统ＦＡ－ＣＡＰＰ，包括ＦＡ－ＣＡＰＰ系统同ＣＡＤ、ＣＡＭ系统的集成，层次化零件特征模型，工艺设计专家系统，系统的结构等。     

非球曲面数控机床图形自动编程系统

介绍了一种适用于非球曲面零件加工的数控机床的自动编程系统。该系统以AutoCAD所设计和绘制图形的数据文件为零件信息输入，自动生成数控加工程序，并进行加工过程的动态仿真，从而实现了CAD／CAPP／CAM／NC的真正意义上的集成。系统具有高度的集成化和智能化，极大地提高了数控加工的效率和质量。     

车身覆盖件虚拟制造系统的开发与研究

介绍了利用通用机械ＣＡＤ软件ＣＡＤＤＳ５和非线性有限元分析程序ＤＹＮＡ３Ｄ进行ＣＡＤ／ＣＡＥ／ＣＡＭ一体化的车身覆盖件虚拟制造系统的开发与研究，给出了车身前翼子板的曲面造型、模具实体生成、成形过程模拟分析及数控加工过程仿真实例，该系统具有良好的应用前景。     

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.     

基于微机CAD/CAM数控网络系统设计

CAD/CAM数控网络系统是一种以windows为操作平台,以CAD/CAM软件为操作方式,并利用中央计算机集成控制和网络数据通信来实现DNC数控加工和数控编程的网络系统。该系统主要适用于企业生产数控化和相关教学、研究单位。     

基于工业PC机的通用化数控系统研究

重点介绍以工业PC机为核心的通用型数控系统的设计思想，硬件结构，系统的软件设计。分别给出了软硬件的结构框图。该数控系统已配置在一台数控车床上，实现了复杂回转类模具工件CNC／CAD／CAM的集成化加工。     

逆向工程集成数据处理系统

在分析研究集成逆向工程系统的特点、关键技术及实现方法的基础上，提出了一种基于商品化CAD／CAE／CAM系统，通过一数据转换器建立集成逆向工程系统的方法，其组成框架包括测量路径规划、数据处理、基准重建、格式及代码转换、CAD／CAE／CAM系统等。根据下游的应用需求。操作者可以选择不同实物测量方式、路径规划和采样点。在完成测量数据的除噪、光滑、对齐、分块和分层后。测量数据可以以IGES格式或系统要求的格式输入CAD系统进行模型重建，建立CAD模型；也可选择直接生成数控代码和STL文件。这种集成方式能提高测量及模型重建的效率。适应不同的应用需求。并能充分利用成熟的CAD／CAE／CAM系统的功能，缩短产品的开发周期。具有柔性及灵活的特点．已成功应用于实践。     

CNC programming system for complex components based on KBE within integrated environment of CAD/CAPP/CAM

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.     

基于均布的群孔加工CAD/CAM系统的研究与开发

为了解决蜂窝陶瓷挤出模具在使用过程中的挤出问题,提出了一种基于均匀分布理论的钻孔路径规划策略;利用VB对AutoCAD软件的二次开发技术,开发了基于群孔加工的计算机辅助设计与制造系统,实现了零件参数化绘制、走刀轨迹规划及NC代码的自动生成等功能,从而大大减少了设计人员的工作量,提高了工作效率。     

An integrated expert operation planning system with a feature-based design model

A framework of a knowledge-based expert operation planning system, TURNPLAN, is described. The system incorporates a feature-based part representation scheme to smooth the essential information flow from design intent to manufacturing practice. Its main functions initially consist of the determination of machining sequence, cutting parameters and cutting tools. To make this system a complete working module for full integration of CAD/CAM, its knowledge base has been further upgraded so that determination of work-holding methods, and generation of tool paths and the associated NC part programs, are included in the system. This integrated system is developed on a PC-based computer using PROLOG, which is found suitable in a batch-type job shop environment for industrial applications. A practical example is included to highlight certain features of the system and the paper concludes with implications for further research.     

Implementation of a “backwards planning” technique in the automation of process planning

It is essential to automate the process-planning function to achieve true integration of CAD and NC machining for computer-integrated manufacturing. Several planning techniques have been used for this purpose and the popular method called the “bottom-up” approach or “backwards planning” has been successfully used in developing an expert process-planning system called EXCAP. This paper describes the implementation of this approach, providing details and examples of the model-updating module which enables the planning to be executed automatically for turned components.     

基于组件NC代码转换关键技术的研究

数控加工仿真是CAD/CAM领域的研究重点。不同的控制系统具有不同的NC代码定义和解释方式,使数控仿真系统支持多种格式的NC代码的仿真,必须对NC代码进行转换。针对这一问题,主要介绍NC代码转换的几个关键技术,包括中间文件的格式、数据结构的定义,转接点处线段夹角的计算,直线拟合圆弧的算法以及刀具半径补偿时刀具中心轨迹的确定。采用组件化程序设计方法,以Fanuc代码为组件对象,实现了仿真系统NC代码的转换组件。     

集成化机床大件工艺系统结构研究

论述了并行工程环境下,集成化机床大件工艺设计系统的体系结构及其实现策略,并且介绍了其在国家计算机集成制造系统（ＣＩＭＳ）推广应用工厂秦川机床厂计算机辅助设计／工艺规划／制造（ＣＡＤ／ＣＡＰＰ／ＣＡＭ）系统中的应用情况。     

回转类零件NC加工智能编程系统

阐述了我公司自行研制开发的回转类零件NC加工智能编程系统,该系统是基于Esprit-X11数据应用软件,利用其二次开发语言Language Programming研究开发的智能化编程系统,主要应用于汽轮机关键零件－－整体转子的NC加工的程序编制。该系统运用CAD／NC全集成的系统原理,在CAD模型接口、CAD几何信息的择取、NC模型转换、NC工艺规范、中间数据转换、NC指令生成以及仿真加工等方面进行了研究和开发。     

基于知识的车灯模具编程模板的开发及应用

分析了车灯注塑模具的工艺结构特征分类及其加工工艺,基于Cimatron E软件环境开发了车灯模具各种结构的高速铣削数控加工工艺及模板,以提高NC编程质量和效率,规范模具加工的工艺路线与工艺参数。实际应用证明了该编程模板具有可行性和实用性。     

CAD/CAM技术在星轮加工中的应用

通过对数控加工中自动编程和手工编程各自的优势及使用条件进行对比,指出了CAD/CAM技术已经广泛应用于各行各业,是加速产品更新、提高产品质量和增强市场竞争力的强大工具.以工件星轮的CAD建模过程和CAM加工过程作为例证进行分析,给出了如何运用CAD/CAM软件生成产品三维模型,刀路轨迹,加工程序及进行产品加工的整个过程,指出了计算机辅助造型及辅助制造的关键技术及操作过程,表明现代企业进行产品加工中使用CAD/CAM技术的必要性,并给出了建模、仿真、加工各个过程的细节问题及注意事项,为数控加工爱好者使用为CAD/CAM过程提供了一种研究方法.     

面向数控加工CAPP的工艺资源和工艺文件的研究

针对数控技术在制造自动化系统(MAS)中起着越来越显著的作用，提出了数控加工CAPP系统的信息流程着重阐述了面向数控加工CAPP系统的工艺资源库和工艺文件的设计内容、设计方法，为实现CAD/CAPP/CAM系统集成奠定了基础。