Integration of a service CAD and a life cycle simulator

This paper proposes ISCL, Integrated Service CAD and Life cycle simulator. ISCL plays the role of CAD/CAE tools for product design in Product Service Systems (PSSs) design. In ISCL, the service CAD supports systematic generation of alternative PSSs based on service modeling, and the life cycle simulator analyzes their economic and environmental performances. The current study applies ISCL to the design of a PSS that includes functional upgrading service of a product, whose life cycle costs are sensitive to both its functional obsolescence and physical deterioration. Performances of alternative PSSs are investigated under different market and technology conditions.     

An integrated computational support for design of system architecture and service

System architecting of mechatronic systems is to develop system decomposition and to define specifications of subsystems and interfaces. This study integrates a CAD for system architecting with a service CAD and life cycle simulation to model and reason about systems architecture and maintenance-related services as well as monetary flows between the manufacturer and user of systems in a life cycle. Such an integrated computational support promotes engineering design of life cycles and services in practice and useful to leverage mechatronics systems as service channels of product-service systems.     

面向并行设计的级进模集成信息模型

将并行工程思想应用于级进模设计,是提高级进模设计效率、降低设计开发成本的 效手段。针对目前特征技术和级进模ＣＡＤ／ＣＡＭ系统的研究现状,提出了面向并行设计和产品全生命周期的特征定义;根据级进模设计的特点,建立了由产品特征模型、冲压工艺特征模型和模具结构特征模型组成的级进模集成信息模型。在此模型的基础上进行了从板金产品特征到冲压工艺特征的特征映射、从冲压工艺特征到模具结构特征的特征映射的研究,所取得     

产品全生命周期建模技术研究

在介绍产品模型的基础上,通过对常规机械ＣＡＤ／ＣＡＭ采用串行工作方式所产生弊端的分析和应用并行工程、虚拟制造等先进技术来缩短新产品开发周期的阐述,证明建立产品全生命周期模型在新产品开发过程中具有重要意义,最后介绍了在建立全生命周期模型中所用于的基于特征、参数化、自顶向下设计、面向装配设计、基于ＳＴＥＰ产品数据交换标准等新技术。     

Product modularity for life cycle design

Modular design is an important elemental technique in life cycle design for improving, e.g., maintainability, upgradability, reusability, and recyclability. Appropriate modular structure differs according to applied life cycle options; e.g., while the modular structure for recycling should be based on material kinds, the structure for upgrading should be based on functions to be obsolete. This paper proposes a method for determining modular structure by aggregating various attributes related to a product life cycle and evaluating geometric feasibility of modules. This paper also illustrates the prototype system that implements the proposed method and a case study of a printer.     

Computer aided manufacturability analysis: Closing the knowledge gap between the designer and the manufacturer

Manufacturing today is marked by increased competition and dispersed global organization, thus necessitating enhanced collaboration among designers and manufacturers. Nevertheless, while Design for Manufacturability (DFM) has been the subject of in-depth research over the past decades, the supporting software solutions have not as yet matured. In this paper we present a holistic approach and supporting software tool, termed the Computer Aided Manufacturability Analysis (CAMA) tool, for capitalizing on available manufacturability knowledge. This is achieved by closing the knowledge loop between the design and manufacturing environments. CAMA captures the knowledge in a structured manner and incorporates this knowledge within the product design tools (CAD systems), thus enabling improved product timeliness and profitability. CAMA represents proof of concept and constitutes a demonstrative prototype of an adaptive and open DFX tool. It is based on industrial surveys of the Knowledge, Information and Data (KID) flows in CAD, CAPP and CAM processes within the manufacturing outsourcing environment. CAMA differs from other approaches in that it is an open system that enables continuous and intuitive capture, modification and implementation of updated manufacturability KID.     

钣金零件CAD/DFM集成原型系统的建立

针对钣金零件的结构特点,采用特征技术,在特征造型的基础上建立了基于Pro／E平台的钣金零件CAD／DFM集成原型系统,从而实现DFM技术在钣金零价加工领域的应用以及产品整个生命周期中设计、制造信息的共享和集成。介绍了钣金零件CAD／DFM集成系统的体系结构、设计原则和采用的关键技术,以及可制造性评价模块的评价过程;以STEP中性文件作为描述产品数据信息的源文件,以产品设计特征数据库和制造特征数据库作为获取传递产品信息的中介,从而实现CAD与DFM的真正集成。采用该系统提供的方法对零件进行工艺性和经济性评价的结果表明,将DFM技术应用于钣金加工领域可以降低产品成本、提高生产率,加快产品的上市速度。     

Die fatigue life improvement through the rational design of metal-forming system

In metal-forming industries, die is an important tool for fabrication of metal-formed products. Die service life, which is defined as the maximum product number produced by die before it fails, and die performance directly determine the quality of metal-formed product and production cost. In cold forming process, die service life basically refers to the die fatigue life. The die fatigue life is determined by the design of metal-formed product and die, forming process configuration, die stress and the entire metal-forming system. In this paper, a methodology for optimization of die fatigue life is developed via the rational design of metal-forming system in such a way that the die stress is optimal and further the die design in terms of its service life is the best. To realize this thought, the S–N approach is employed for evaluation of die fatigue life. The die stress is first identified via the integrated simulation of billet plastic flow and the die deformation during the forming process. The die stress is then optimized via the rational design of the combination of metal-formed product, die and process configuration. The optimal die life is thus determined. Furthermore, a framework for implementation of this methodology is developed and case studies are used for verification and validation of the developed methodology.     

Coevolution of digitalisation,organisations and Product Development Cycle

Over the past 70 years, product design has undergone many important changes due to the impact of contemporary digital technologies (i.e. digital design).To support digital design and information flow throughout the product lifecycle, the digital-driven technologies currently in use rely on the evolution of CAD and PLM systems to address new design and manufacturing challenges generated by the new era of 4.0 digital transformation.This paper will discuss the past and present coevolution and shortcomings within industrial organisations, the digital technologies employed in the product development cycle and will illustrate the current challenges and future prospects of the digital thread for design.     

CAD/CAE/CAM技术在现代塑料模设计制造中的应用

介绍了CAD/CAE/CAM技术在现代塑料模设计与制造中的应用,采用CAD/CAE/CAM技术可提高模具产品的设计质量、缩短模具设计与制造周期、降低产品成本。还简要介绍了并行工程、逆向工程、知识工程在塑料模中的应用,展望了现代塑料模设计制造技术的发展。     

基于Pro/E的缸体侧盖压铸模设计

基于Pro/E的CAD/CAM模块,以缸体侧盖为例介绍了压铸模的设计过程,利用Pro/E进行设计,大大缩短了产品研发周期、模具设计周期和加工周期,同时提高了产品设计的准确性,降低了产品开发和模具设计成本.     

电脑辅助钛合金人工髋关节锻件的开发

人工股骨柄是人工髋关节组件之重要分件 ,又是影响手术后人工髋关节使用寿命的重要因素 .由于人工股骨柄截面形状及细长比差异很大 ,为考虑钛合金锻造特性及省料、预成形之设计相当重要 ;本文针对钛合金人工髋关节股骨柄锻造工艺之设计要项 ,应用电脑辅助设计及锻造工艺模拟解析技术于锻坯和模具设计 ,期能缩短开发时程并降低开发成本     

Life Cycle Simulation System for Life Cycle Process Planning

To realize closed loop manufacturing, it is essential to design product life cycles and to plan life cycle processes property. Life cycle simulation has been recognized as an effective tool in this direction. In this paper, we present a life cycle simulation system developed as a general tool for life cycle design and management. The system includes functions for modelling and controlling each life cycle process in a flexible manner. The system maintains usage history of products and parts independently taking the reuse of parts into account. Examples of the simulation are shown for both a rapid life cycle scenario and for a part sharing scenario over the product generations.     

筒形件拉深模CAD系统的开发

模具CAD系统使模具设计的高质量、低成本、短周期的实现成为可能.本文利用ActiveX Automation技术,以VB6.0为开发工具对AutoCAD进行二次开发,研究出筒形件冲压模具CAD系统,系统采用模块化结构,主要阐述了工艺分析计算模块、模具设计模块、自动绘图模块等主要模块功能及其实现方法,该系统能够对不同规格筒形件的冲压模具进行计算机辅助设计,完全实现人机交互功能,提高了设计效率和质量.     

Approximate Product Life Cycle Costing Method for the Conceptual Product Design

Although the product life cycle cost (LCC) is mainly committed by early design stages, designers do not consider the costs caused in subsequent phases of life cycle. The estimating method for the product life cycle cost in early design processes has been required because of both the lack of detailed information and time for a detailed LCC for a various range of design concepts. This paper suggests an approximate LCC method that allows the designer to make comparative LCC estimation between the different product concepts. The product attributes at the conceptual design phase and LCC factors are introduced and the significant product attributes are determined by statistical analysis. Neural network algorithms are applied to estimate LCC by considering the identified product attributes as inputs and the LCC as output. Trained learning algorithms for the known characteristics of existing products will quickly give the estimation of LCC for new product concepts. The estimation for maintenance and energy costs of electronic appliances is shown as an example. The proposed method provides the good estimation for the LCC and gives the guidelines leading to cost-effective design decision-making at the early design stage.     

New Trends in Rapid Product Development

This keynote paper presents an overview of new approaches in rapid product development from the design point of view. The evolution of the market has necessitated the reduction of time-to-market, mainly because the product life cycle is shorter, but also because it is very important to proceed more rapidly from an initial conception to a mass production object. As a result of newly evolved software environments, knowledge-based systems, and product data management, processes for integrated design and manufacturing for new products have emerged. Due to this evolution of rapid prototyping technologies, it has become possible today to obtain parts representative of mass production within a very short time. This keynote paper provides an overview of the actual trends in all the components that affect the speed and efficiency of product development, in particular all the possibilities available to the designer, from the earliest stages of a product's life cycle.     

Assembly and Disassembly Processes in Product Life Cycle Perspectives

Industrial companies change the paradigms of business operations from optimisation of manufacturing processes to optimisation of products life cycles in order to activate the value of products, taking into account the potentials of product services in all phases of each product's life. From design to the end of their life capital intensive products, like manufacturing or assembly systems, are linked to a manufacturer network by global communication systems. This network allows special services even in the phases of usage and recycling. For this new paradigm it is necessary to develop strategies, methods and technologies to manage the business processes and the information and knowledge required in all phases of a product's life and to industrialise the processes of design, assembly, usage, service and remanufacturing by disassembly and recycling. It is the objective of this paper to define the processes for management of life cycle with a focus on assembly, service and disassembly of capital intensive products.     

打印机支架模具设计与编程

阐述了CAD/CAM/CAE技术在塑料模具设计中的应用。以UG5.0为平台进行产品建模及模具设计,以Moldflow为分析软件对产品进行优化,使用Power-MILL对成型零件的制造过程进行设计仿真,通过后置处理输出NC（数控）代码,传输到数控机床上进行产品的加工。整个设计过程实现了无纸化,提高了模具的生产效率,节约了生产成本,并大大缩短了生产周期。     

Toward integrated product and process life cycle planning—An environmental perspective

Life cycle engineering (LCE) is a key concept for promoting environmentally sustainable practices among manufacturing firms. A major hurdle in the implementation of LCE is the lack of a systematic and strategic method to design or plan an entire product life cycle. To address this issue, this keynote provides a framework for life cycle development and proposes the concept of life cycle planning. This paper aims to provide explicit and systematic methodologies for life cycle planning by reviewing this research area. Practical cases that employ life cycle planning are also illustrated. Finally, some research directions are suggested.     

基于异构CAD平台的可参数化Web三维模型库构建

构建网络三维模型库的目的在于实现对大量零部件三维CAD模型资源的规范化组织和高效集中管理。基于异构CAD平台构建了可参数化Web三维模型库系统架构,并对基于OSG的三维模型网络可视化、基于异构CAD系统的三维模型参数化驱动设计及二次开发接口统一封装、三维CAD模型及参数加密等关键技术进行了讨论;给出了原型系统及其在复杂产品——节能抽油机快速虚拟样机设计过程中的应用实例。结果表明:开发的基于异构CAD平台的可参数化Web三维模型库不仅能满足不同CAD用户需求,且支持在线三维模型浏览和参数化驱动设计,提高了产品开发效率。