一种新的PDM技术方案

提出了一种新的PDM技术方案——C/B/S体系结构,论述了这种新方案的原理并论证了其可行性,分析了它的创新点,最后比较了C/B/S结构的PDM系统与传统PDM系统的优缺点,并大胆地预测了PDM的发展方向。     

分布式存储环境下CAx模型的一致性策略

现有分布式存储环境在维护主、副本的一致性时,无法避免冗余的副本建立或更新,在存储较大且无法对副本进行局部更新的CAx模型时,主、副节点之间的网络带宽浪费严重,为解决该问题,提出了一种一致性策略。该策略能够跟踪主本的变化,当且仅当副本被访问且与主本不相同时,副本才会被更新。基于有限自动机和自动机乘积,给出了策略的形式化定义。通过分析状态图,确定策略是完备的和安全的,并给出了策略的技术实现。最后,通过实例证明了该策略的有效性。     

基于PDM的CAx集成技术研究

信息共享在产品开发过程中十分重要,基于ＰＤＭ的ＣＡｘ信息集成为开发者提供一个协同的工作环境,确保ＣＡｘ产生的数据的唯一性。本文根据作者参加了在西安飞机制造（集团）有限公司并行工程的实施和对ＩＢＭ公司ＰｒｏｄｕｃｔＭａｎｇｅｒ的认识,初步探讨了ＣＡｘ与ＰＤＭ的集成方案,以及ＣＡｘ信息集成管理的内容,并介绍了ＣＡｘ分系统之间的信息集成途径与技术。     

分布式CAx集成平台的研究

分布式CAx集成平台是将图形用户界面（GUI）、数据库系统和网络技术综合起来共同为CAx应用软件系统集成服务的通用集成系统，它采用客户／服务器体系结构，中间件技术实现了三层网络结构，重点阐述了该平台的关键技术及集成实例。     

BEE—DAE系统的设计与实现

ＢＥＥ—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、以及数据访问接口和数据库与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。     

CAx Process Chain for Automated Laser Drilling of Tool Molds

Rotation sintering, also known as slush molding, is used to manufacture molded skins, such as dashboards or door interior panels for cars. At present, approximately 80% of such molded skins are manufactured using electroforms to achieve the complex free-form surfaces, and surface structures, such as leather graining that the industry demands. The manufacture of these electroforms is, however, time-consuming and expensive. This project aims to replace conventional electroforms with laser-drilled molds. Holes in tool molds should be drilled by using laser radiation as part of an automated process. The system consists of a robot with a fiber-laser beam source. A CAx （computer-aided x） process chain has been developed for this purpose in which the CAD （computer-aided design） data of the tool molds are processed, drill hole fields generated, and a machine-specific RC （robot control） program created. Process-specific fundamentals, such as suitable process windows and process control, have been devised to manufacture holes using fiber laser radiation The advantages of the new laser-drilled tool molds may result in substituting them for conventional electroforms, allowing old markets to be re-entered or additional markets to be created and targeted through new molds or lower costs.     

基于PDM技术的CAx集成和管理的研究

基于PDM技术的集成化应用平台，为飞机结构件生产的CAx集成和管理应用提供了全面的支持。对PDM进行的二次开发功能，使不同CAx系统的应用人员在不熟悉PDM的情况下，也能方便地从中读取所需要的信息，又能将各自应用的结果放回PDM中去，实现企业内现有CAx的集成和管理，达到与车间管理系统ERP和车间DNC信息共享。     

SDAI的实现及应用研究

讨论了标准数据存取界面（ＳＤＡＩ）的功能、特点和实现方法，并给出了基于Ｗｏｒｋｉｎｇ－Ｆｏｒｍ（工作格式）、Ｃ语言迟联编的ＳＤＡＩ实现机理与系统结构，在已实现的ＳＤＡＩ操作函数基础上开发出ＳＴＥＰ文件前、后置处理器开发工具。同时给出了一个产品数据管理（ＰＤＭ）原型系统的系统结构和模块划分，以及ＳＤＡＩ在这一系统中的作用及在ＣＡｘ系统间的数据交换中的应用。     

IGES后处理器的实现研究

CAx之间的差异性,导致产品数据信息难以进行共享、集成.IGES作为一个对此解决方案的规范,是一种实现不同CAD /CAM系统之间数据转换的中性文件标准规范.IGES后处理器是一种为了将数据从该规格定义的交换文件格式,翻译成本地CAD系统的数据、其他图形系统的数据或另标准交换格式的工具.介绍IGES的主要特点以及使用Direct 3D技术实现IGES的CAD/CAM后置处理器设计思路与基本过程.     

Engineers'' CAx education—it''s not only CAD

The general product development can be divided into three phases: creative, conceptual and engineering phase. All phases of the complete life cycle of a product are supported by various IT-systems often called ‘CAx’¹-systems. Therefore CAD-education should be extended to ‘CAx-education’ and pay attention to all phases of the life cycle.

When looking at today's process chain many different jobs related to CAx can be identified. All of them require different levels of knowledge about subjects like information technology, design procedures or CAGD^{, 2}-functionalities.

The methods to teach those subjects vary from simple autodidactic, via computer supported training methods to interactive person to person training. In industry, the training methods are primarily depending on the company's size and branch. The bigger the company is, the more complex are the training methods and the more specialized is the CAx-education.

Enterprises specialised on CAx-training but also in-house education departments are concerned. Other possibilities for CAx-education are internships, technical colleges and universities. All of those suffer from the complexity of the subject and result often in broad but superficial education.

Apart from knowledge about CAx-systems and their usage, the students have to learn also about the organisation of the CAx-process and its structures including the cooperation of enterprises.

Following these experiences the students or employees will at first be trained in fundamental CAS/CAD/CAM. In a second step they will attend special courses for PDM, Data exchange, FEM, or others. On higher level there will be courses dealing with PLM^{, 3}, process- and company networks, with future trends and techniques. During the whole education the application aspect has to be dominant.