GHCAD：一个产品模型为基础的CAD／CAM集成系统

ＳＴＥＰ是关于产品数据表达和交换的国际标准，如何将ＳＴＥＰ的方法和规范应用于系统开发是解决计算机集成制造系统（ＣＩＭＳ）开发的关键问题之一。集成化ＣＡＤ／ＣＡＭ系统是ＣＩＭＳ的核心，实现将ＣＡＤ的工程设计功能和ＣＡＭ的制造功能的结合。本文介绍一个产品模型为基础的ＣＡＤ／ＣＡＭ集成系统－ＧＨＣＡＤ。系统采用ＳＴＥＰ的数据交换、建模思想，以产品模型为核心，通过ＳＴＥＰ的标准数据接口ＳＤＡＩ实现了系统的集成。     

采用标准数据接口SDAI的CAD／CAM系统集成

如何将ＳＴＥＰ的方法和规范应用于系统开发是解决计算机集成制造系统（ＣＩＭＳ）开发的关键问题之一。集成化ＣＡＤ／ＣＡＭ系统是ＣＩＭＳ的核心，实现将ＣＡＤ的工程设计功能和ＣＡＭ的制造功能的结合。本文讨论通过ＳＴＥＰ的标准数据接口ＳＤＡＩ实现系统集成的集成方法，采用ＳＴＥＰ的数据交换、建模思想，实现了一个产品模型为核心的ＣＡＤ、ＣＡＭ集成系统－ＧＨＣＡＤ（高化ＣＡＤ）。     

基于PDM的CAD/CAPP、CAM集成

该文以８６３／ＣＩＭＳ示范工程的实践和开发为依据,对基于产品数据管理（ＰＯＭ）的ＣＡＤ／ＣＡＰＰ、ＣＡＭ集成进行了深入研究。文章首先给出了系统集成的原则,随后提出了ＰＤＭ的框架体系结构和基于ＰＤＭ的集成技术,最后讨论了基于ＳＴＥＰ的产品数据交换和基于ＳＤＡＩ标准数据接口技术。     

面向应用协议的CAD／CAM集成模式

本文提出以ＳＴＥＰ为核心，直接支持ＣＡＤ后续各应用系统的特征造型方法和ＣＡＤ／ＣＡＭ集成模式，不仅在一般意义上实现基于ＳＴＥＰ的信息集成，而且是对于ＳＴＥＰ利用应用协议实现ＣＡＤ／ＣＡＰＰ／ＣＡＭ信息集成方法的拓展。     

STEP信息集成软件工具的设计和实现

ＳＴＥＰ是国际标准化组织ＩＳＯ正在组织开发的应用于计算机集成制造系统（ＣＩＭＳ）信息集成的产品数据表达与交换标准，ＳＴＥＰ不仅是一种规范，更是一种信息集成技术，本文以ＣＡＤ／ＣＡＰＰ／ＣＡＭ系统集成为背景，提出了ＳＴＥＰ信息集成支持工具ＥｘＴｒａ的设计和实现技术，该软件工具已成功且有效地应用于ＣＡＤ／ＣＡＰＰ／ＣＡＭ系统集成中。     

基于STEP的曲线曲面造型技术

ＳＴＥＰ做为新一代的产品数据交换标准，正在被越多越多的ＣＩＭＳ系统所青睐，本文介绍了ＳＴＥＰ的特点，特别是对ＳＴＥＰ中作为曲线面造型系统设计基础的几何与拓扑集成资源做了较深入的解剖和分析，并在此基础上提出了一个基于ＳＴＥＰ的曲线曲面造型系统ＡＤＤＳＳ。     

基于STEP的曲线曲面造型技术

ＳＴＥＰ做为新一代的产品数据交换标准，正在被越来越多的ＣＩＭＳ系统所青睐，本文介绍了ＳＴＥＰ的特点，特别是对ＳＴＥＰ中做为曲线曲面造型系统设计基础的几何与拓扑集成资源作了较深入的解剖和分析，并在此基础上提出了一个基于ＳＴＥＰ的曲线曲面造型系统ＡＤＤＳＳ。     

基于STEP的CAD/CAPP集成工具的研究

长期以来,ＣＡＤ／ＣＡＰＰ信息集成一直是ＣＩＭＳ系统的难点之一,且没有得到较好的解决。ＳＴＥＰ标准的发展和应用,使其成为ＣＡＤ／ＣＡＰＰ／ＣＡＭ系统信息集成的基础。随着越来越多的ＣＡＤ系统支持ＳＴＥＰ标准,开发基于ＳＴＥＰ的ＣＡＤ／ＣＡＰＰ集成工具成为当务之急。     

DEE_DAE系统的设计与实现

ＤＥＥ＿ＤＡＥ是一个基于数据库且支持ＳＴＥＰ／ＳＤＡＩ的数据交换软件系统本文讨论了其设计和实现,包括设计思想,结构组织,以及数据访问接和数据库与ＳＴＥＰ中性文件转换器等功能模型。该软件的开发为集成环境中ＣＡｘ系统的共享数据管理提供了方便和有效的工具。     

STEP标准与CAD／CAM数据管理

ＳＴＥＰ标准与ＣＡＤ／ＣＡＭ数据管理北京航空航天大学制造工程系张彦平香港城市大学ＪｏｈｎｎｖＰｏｏｎ一、引言ＳＴＥＰ（ＳｔａｎｄａｒｄｆｏｒｔｈｅＥｘｃｈａｎｇｅｏｆＰｒｏｄｕｃｔｍｏｄｅｌｄａｔａ）是国际标准化组织ＩＳＯＴＣ１８４／ＳＣ４正在组织开...     

基于STEP标准的通用有限元数据基的构成

在进行工程设计和产品设计时,通常需要应用有限元技术进行设计对象的力学分析,在这个过程中不仅会生成大量的数据,还需要在不同的有限元软件之间,不同的有限元前后处理软件之间,或者有限元软件与ＣＡＤ／ＣＡＭ软件之间进行数据交换,针对目前有限元软件主要采用点对点数据交换模式所存在的缺点,提出了建立为适的交换模式－有限元数据基的设想,并基于ＳＴＥＰ标准构建了有限元数据基的中性文件的表述形式及其ＥＸＰＲＥＳＳ描     

The new role of intranet/internet technology for manufacturing

Information processing is essential in manufacturing, where products are produced based on available information from various sources. A number of techniques and methodologies have been developed and utilised to achieve efficient exchange of information, such as the adoption of turnkey systems, neutral standards, e.g. PDES, STEP (ISO-10303). In recent years, the Internet has become the worldwide information platform for the sharing of all kinds of information, and Intranet, which is based on Internet technology but is used within an organisation, has become a preferred platform for data sharing. This change provides a new role of Intranet/Internet technology for manufacturing, particularly for those companies struggling to gain a competitive edge in the global manufacturing area. This paper describes how an Intranet can be established within an organisation, and analyses the future role of this new technology in the manufacturing community.     

A PDES/STEP-based information model for computer-aided process planning

Computer Aided Process Planning (CAPP) constitutes one of the most essential elements in Computer Integrated Manufacturing (CIM). Although many CAPP systems have been reported in literature during the last two decades, few of them are compatible enough to integrate easily with other systems in the CIM environment. One major reason is the lack of an effective method to represent the information required by CAPP, and to unify such information with the information of other systems in the CIM environment. Indeed, this problem has received relatively inadequate attention in the recent research of CAPP systems. In this paper, an information model for CAPP is developed by using the object-oriented modeling and the Product Data Exchange Step/STandard of Exchange Product data (PDES/STEP) techniques. The model consists of the part information model, the process plan information model, and the production resource information model. The EXPRESS language or the EXPRESS-G diagram is used to represent these models. Indeed, the proposed information model will greatly improve the CAPP system's capability of effective integration with other systems in the CIM environment, and, ultimately, to facilitate the implementation of the whole CIM strategy in manufacturing enterprises.     

Concurrent engineering with delta files

We describe a test system in which we used a data management system and delta files to communicate engineering changes between two modeling systems: an ACIS-based solid modeling system running on a Sun Sparc workstation to create a part, and a CATIA system running on an IBM RS/6000 to design a fixture for it. The test system communicates the first version of the MBB part between the two engineers as a PDES/STEP (Product Data Exchange Standard/Standard for the Exchange of Product-Model Data) exchange file. The ACIS engineer then makes an engineering change to the part, thus creating, the second version (V2) of it, and a delta file communicates the V2 changes to the CATIA engineer. The CATIA engineer can use this delta file to highlight the changes to the part between the two versions. Although our test system/scenario is simple, it demonstrates the advantages of delta files. It also helped us identify several important issues for developing the method further. We first outline the STEP standard and how we used it to implement data exchange in our test system, then we discuss delta files and describe how we implemented them. We conclude with a discussion of the lessons learned from the test system and scenario     

以OOEDB为核心的集成化CAD/CAPP/CAM 系统GS-ICCC的设计与实现

ＧＳ－ＩＣＣＣ是一个以自行研制开发的面向对象工程数据库管理系统ＯＳＣＡＲ为核心的集成化ＣＡＤ／ＣＡＰＰ／ＣＡＭ系统，它的主要特点是按照ＳＴＥＰ标准在全局产品数据模型基础上实现ＣＡＤ，ＣＡＰＰ，ＣＡＭ的信息集成，本文围绕着这一原则介绍了ＧＳ－ＩＣＣＣ的系统总体结构，ＯＳＣＡＲ功能组织，全局产品数据建模框架以系统集成的设计与实现。     

A STEP-BASED CAD/CAPP INTEGRATION

ＡＳＴＥＰ－ＢＡＳＥＤＣＡＤＩＣＡＰＰＩＮＴＥＧＲＡＴＩＯＮＺｈｅｎｇＬｉａｎｙｕ；ＤｕＰｅｉＡＳＴＥＰ－ＢＡＳＥＤＣＡＤＩＣＡＰＰＩＮＴＥＧＲＡＴＩＯＮ￥ＺｈｅｎｇＬｉａｎｙｕ；ＤｕＰｅｉＡｂｓｔｒａｃｔＴｈｅｉｎｆｏｒｍａｔｉｏｎｉｎｔｅｇｒａｔ...     

Intelligent front-ends and product models

Research efforts in two separate areas, intelligent user interfaces and product data models have in the past been carried out almost totally independently from each other. It would, however, seem that product models could be integrated into Intelligent Front-Ends and that results from Intelligent Front-End research could be used for building the user interfaces to database information stored according to product model schemas.The paper starts with an introduction to data base theory and then moves on to present general features of product models. The presentation is on a general level but the examples are picked from the building domain. The international effort to define a standardized basic product model framework, the PDES/STEP project, and the data modeling methods used in it are also described. Work with prototype interfaces to product data models for the building domain is described as an example of the role Intelligent Front-Ends could play in product model based applications. The paper ends with a short discussion of the role product models could have in Intelligent Front-Ends.