CAD与CAM系统集成研究与实现

介绍了CAD模型数据的检取技术和格式转换技术,描述了CAD/CAM的总体框架,并对实现该框架所涉及的内容及其实现技术进行了深入研究,同时给出了在Solidworks环境下所实现的CAD/CAM系统集成的实例.     

基于XML的CAD/CAPP/CAM信息集成技术

在比较目前几种流行的系统集成技术的基础上 ,通过采用基于特征、面向对象的方法为产品几何数据和非几何数据建立信息模型 ,结合以计算机内部模型表达的产品定义数据 ,提出了一种基于 XML 标准的信息集成解决方案 ,并首次将 JDOM技术和 XQL查询技术珠联璧合地结合在一起实现对 XML文档高效地访问、操作 .该方案以灵活的数据模式、可重用的信息模块、易扩展的数据接口有效地、可靠地解决产品在设计和制造过程中信息的交换和共享 .     

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。     

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。     

The role of interfaces,product models and data formats for the integrated use of CAD and for the integration of CAD/CAM

A reference model is presented, which describes the global functionality of a CAD system in a manufacturing environment. The different interfaces in such a model, their functionality and their contribution to the integration of CAD in a given environment are presented as well. Some standards (existing or under development) to be located in such a framework (e.g. IEEE 488 Bus, PDV Bus, ETHERNET Bus, GKS, VDM, VDI, IGES, etc.) are addressed, and the role of product models and dialogue programming based on dialogue cells is discussed in detail.     

Merging Functional Form Feature into GT Codes to Enhance the CAD/CAM Integration

The TangShan Research Institute of Group Technology has been engaged in the develop-ment of GT for the light industry machinery building factories since 1980.Under its overall supervisionmore than 8 factories have applied GT to drawing control and process planning,while 4 of them reorga-nized their machine shops into GT cells and the throughput capabilities were raisd immediately by 15 toeven 49%.Since the existing GT coding systems predict only the global characteristics of machine parts,theirapplication alone is unable to transfer all the information needed for the CAD/CAM integration in aCIM environment.From the very beginning of 1989,we started to study the feasibility of introducingconcepts of Functional Form Features into GT codes.Based on the exhaustive study of nearly 100,000part drawings from machineries for making pottery and porcelain appliances,cigarette,paper pulp,glass bottles,plastics moulding,beer and beverage filling etc.,a new GT/FFF coding system wasworked out and a corresponding set of standard drawings assembled from FFF primitives Was formulat-ed which can cover up to 65—75% of existing parts from light industry machineries.FFF based GTcodes greatly facilitate the standardization control of released drawings,accelerate the engineering de-sign and process planning,and certainly will play an important role in the future CIM organization.     

A study on product modelling for integration of CAD/CAM

Modelling capability for products to be designed and manufactured plays an important role in order to effectively construct and utilize CAD/CAM systems. Product models should represent all the information about products, which is utilized in manufacturing processes. Therefore it is required that they describe functional structures of machine products, and include not only geometric information but also various non-geometric data, such as physical, technological and management data. Presently there do not seem to exist definite methods or theories for constructing product models. In this paper, we first investigate the whole manufacturing process, and propose a system structure for integration of CAD/CAM, in which product modelling plays a fundamental role. Then requirements for product modelling are studied thoroughly, and a new representation framework for product models is proposed. It consists of an object concept called frame, relations among frames and attributes, and it can incorporate the existing various modelling capabilities, such as solid modelling. We use this representation framework in combination with our solid modelling package GEOMAP-III, and show the effectiveness of this approach by performing illustrative design experiments.     

Integrated information processing for manufacturing—from CAD/CAM to CIM

The trend to integrated information processing (CAD/ CAM) leads to some new requiements. Consistent information processing in the presparation of production and in the production process demands an efficient division of labour between man and machine, the future-oriented engineer having to be especially prepared for this. In the present paper the resulting new demands on training and education are formulated. The essential features of integrated systems of automated information processing are characterized, and fundamental problems of the complex decision findings are explained from the angle of the manufacturing engineering. The paper is concluded by examples of solutions for the fully automated preparation and execution of production.     

A framework for extending computer aided process planning to include business activities and computer aided design and manufacturing (CAD/CAM) data retrieval

Computer aided process planning (CAPP) systems have had limited success in integrating business functions and product manufacturing due to the inaccessibility and incompatibility of information residing in proprietary software. While large companies have developed or purchased complex order management and engineering applications, smaller manufacturers continue to use semi-automated and manual methods for managing information throughout the lifecycle of each new product and component. There is a need for reconfigurable and reprogrammable systems that combine advances in computer aided design (CAD/Computer Aided Manufacturing (CAM) technology and intelligent machining with product data management for documentation and cost control. The goal of this research is to demonstrate an architecture in which customer service, CAPP and a costing methodology known as activity based costing (ABC) are incorporated into a single system, thereby allowing companies to monitor and study how expenditures are incurred and which resources are being used by each job. The material presented in this paper is the result of a two year university and industry sponsored research project in which professors and students at the Costa Rica Institute of Technology developed a software application for FEMA Industrial S.A., a local machining and fabrication shop with sixty five employees and both conventional and CNC capabilities. The final results represent not only a significant contribution to local industry and to the students’ education but, also to the continuing growth of CAPP. Implementing better decision making tools and standardizing transactions in digital format would reduce the workload on critical personnel and archive valuable knowledge for analyzing company methods and expertise.     

Advanced production systems (APS) — CAD/CAM systems of the future

The CAD/CAM-area is one of the fastest expanding areas in industry of today. In order to support user- as well as vendor-industry, a Norwegian-German project has been started in the field. It consists of a short term project (1982–1984) and a long term project (1982–1991). The paper deals with the results of the cooperative project (APS).     

CAD/CAM的应用与发展

本文从国内外的应用情况出发,叙述了CAD/CAM技术的发展过程,指出了我国在应用CAD技术上当前存在的主要问题。     

CAD/CAPP/PDM/ERP系统集成研究

在分析我国制造业信息化的现状基础上,文章首先给出了基于PDM的CAD/CAPP/PDM/ERP集成框架,建立了产品设计、制造阶段的集成信息模型,最后分别对CAD与PDM、CAPP与PDM、ERP与PDM的集成进行了阐述。实践证明,通过本集成方案的应用,大大提高了企业产品开发的效率。     

循序渐进掌握CAD/CAE/CAM 技术

根据CAD/CAE/CAM 技术的特点和各教学课程的适应性,采用分课程侧 重学习该技术的某些内容、结合生产实际综合应用各知识点的教学方式,让学生在大学期间 熟练掌握CAD/CAE/CAM 技术,成为具有实际动手能力的工程技术人才。     

The development and application of CAD/CAM workstations in the GDR

For accomplishing low-attended manufacture, step by step, it is necessary that information handling in technological production planning, management and shop control processes is organized economically. This is especially true with respect to computer-aided product development and production planning, faster order throughput, control of production equipment and delivery of information needed for high equipment utilization with a simultaneous increase in the volume of data processed automatically. These complex requirements call for a new type of approach in information handling technology (CAD/CAM) and corresponding layouts of workstations for the designer and manufacturing engineer. Such CAD/CAM facilities should be user-friendly so that they can be adapted to the user's need and not vice versa.     

Strong normalization from an unusual point of view

A new complete characterization of β-strong normalization is given, both in the classical and in the lazy λ-calculus, through the notion of potential valuability inside two suitable parametric calculi.     

Changes in atmospheric radiation from the statistical point of view

Modelling of changes in atmospheric radiation within the last decade is considered. First, vertical atmospheric radiation profiles are considered as a sample of functional variables and the dependence on time is estimated by a non-parametric regression (kernel smoothing). As a main result, parametric functional multiplicative regression models are provided. In particular, non-periodic models are motivated in a straightforward way by the observed data, while periodic proposals respect a hypothetical relation between atmospheric radiation and the 11-years solar cycle. Finally, some remarks on computational aspects and the choice of a suitable function space are given.     

基于STEP和约束机制的CAD/CAP集成技术的研究

提出一种支持用户自定义ＣＡＰＰ数据结构,及与多种ＣＡＰＰ系统集成的方法,通过对ＣＡＰＰ系统的数据模型（用Ｃ／Ｃ＋＋描述）进行分析,获取其词法与语义信息,按照ＣＡＰＰ系统数据模型的数据要求,在集成系统的末端给出工艺数据,以工艺特征树为操作核心,实现了ＣＡＤ系统与多种ＣＡＰＰ系统之间的数据交换。同时,该技术在产品数据的交换中支持ＳＴＥＰ标准,实现了基于ＳＴＥＰ的信息集成。     

点云数据与CAD/CAM软件接口方法研究与实现

测量系统获得的点云数据只有转换成CAD/CAM软件所要求的格式才能被其接受并完成建模。本文针对CAXA、UG、Pro/E三种常用CAD/CAM软件接受点云数据的格式进行了深入研究并实现了数据接口。