基于等离子弧焊的金属零件直接制造系统设计

金属零件直接制造技术目前已成为快速成形技术的研究热点和重要发展方向.基于等离子弧焊的金属零件直接制造技术是一种非常实用而且制造成本较低的直接快速制造金属全密度零件的方法.在分析金属零件直接制造原理的基础上,设计并开发了基于等离子弧焊的金属零件直接制造软、硬件系统,并采用该系统进行高温合金中空零件制造实验.实验结果表明,采用等离子弧焊直接制造系统可以得到成形良好、组织细密的金属零件.     

集成产品特征映射与可制造性分析

设计与制造的集成是实现集成产品设计的关键,采用制造特征的产品模型定义可以完整准确地表示零件的加工制造信息.提出采用加工过程"切削特性"的制造特征的表示方法,建立了零件制造特征的动态模型.通过对特征间映射规则的研究,实现了形状特征向制造特征的映射.开发的特征映射与可制造性分析系统,验证了制造特征的表达与特征映射技术的可行性,为CAPP中产品模型的表达提供了有效解决途径.     

折弯零件面向加工的基于特征设计系统

本文提出了一套新的特征信息描述方法和系统结构，据此建立了折弯零件的设计特征库，实现了零件的基于特征设计。根据并行工程设计方法的特点，提出了面向加工的设计系统结构，总结了折弯零件的工艺约束和可制造性规则，通过将这些约束条件引入产品设计阶段，使产品设计和可制造性评估成为并行的活动，实现了面向加工设计的功能。     

折弯零件面向加工的基于特征设计系统

本文提出了一套新的特征信息描述方法和系统结构，据此建立了折弯零件的设计特征库，实现了零件的基于特征设计。根据并行工程设计方法的特点，提出了面向加工的设计系统结构，总结了折弯零件的工艺约束和可制造性规则，通过将这些约束条件引入产品设计阶段，使产品设计和可制造性评估成为并行的活动，实现了面向加工设计的功能。     

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。     

面向可制造性评价的航空发动机叶片零件信息模型研究

针对可制造性评价的工程需求,基于广义特征和STEP标准建立叶片零件信息模型,并在UG软件二次开发的基础上,实现了一个基于特征的CAD系统.基于所建立的零件信息模型,系统可自动生成STEP文件,为设计的后续可制造性评价提供丰富的叶片零件信息,便于实现CAD与后续过程的集成和并行.利用建立的叶片零件信息模型,实现了CAD/CAPP/DFM的信息集成.     

基于微束等离子熔覆的直接金属快速成形系统设计

金属零件直接制造技术目前已成为快速成形技术的研究热点和重要发展方向.提出一种基于微束等离子熔覆工艺的直接金属成形方法,介绍该方法的工作原理和系统构成,设计并开发基于等离子熔覆的金属零件直接制造软、硬件系统,并采用该系统进行中空零件成形实验.实验结果表明,并采用微束等离子熔覆直接制造系统可以得到成形良好、组织细密的金属零件.     

模具工作零件表面强化技术应用研究

对表面强化技术在模具工作零件制造过程中的应用进行了研究,分析了该技术的功能性、环保性和增效性等优势在模具制造成本、模具质量和模具寿命等方面的重要作用。结果表明,选择众因素的最佳匹配点,可以在一定程度上弥补目前模具材料的不足,可显著改善模具寿命和质量。     

一种基于遗传算法的钣金零件排样算法

钣金类零件是通过压力成形技术制造的一种应用广泛的零件,现今钣金件的数字化制造手段日益广泛。钣金工艺设计是钣金设计和制造之间的重要连接环节,科学合理的工艺是生产优良产品的重要因素。但钣金产品的工艺设计水平却远远落后于其设计和制造水平,成为了制约产品质量和成品的瓶颈。本文以一种复杂的锂电池箱体为例,对钣金件的数字化制造进行研究。首先提出了钣金件数字化集成制造的总体流程,研究了钣金件的设计、展开、板材的排样、激光切割、数控冲压和折弯等技术,实现了锂电池钣金箱体的集成制造。     

硬铝材料的微小零件切削加工

微小型轴类零件是微小型机械系统中最为常用的零件，其加工过程的可行性和可靠性研究是切削加工技术中非常重要的内容。试验结果表明，应用车削技术加工硬铝材料的微小型轴类零件是一种有效的办法，但还有一些问题值得研究。     

Design for machining using expert system and fuzzy logic approach

Design for machining is an essential part of design for manufacturability (DFM). This paper presents a fuzzy logic expert system, SMARTDFM, to help designers obtaining technical information about design for machining. It can help design engineers to consider various machining aspects in the early stage of product design. A hierarchical structure has been established for the knowledge base. This expert system can classify all the components into different component shapes. The design guidelines and their justifications have been built into the expert system. This system also offers graphic display for visualization of the product design. Backward chaining is used in the inference engine. This system solves the uncertainty of the classification of component shapes using fuzzy reasoning. The design engineers can obtain very specialized guidelines and explanations about design for machining, such as component shapes, accuracy and surface finish, work material and standardization, kinematic design, component assembly, etc. Furthermore, SMARTDFM offers the shortest path for all the questions so that design engineers can get the information about design for machining very quickly. In simple words, SMARTDFM can be used by design engineers to apply design for machining principles efficiently and effectively.     

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.     

支架自动攻丝级进模设计

介绍了带自动攻丝机构的级进模,通过分析支架零件的工艺性,设计了排样图与模具结构,并对模具结构特点进行了说明,模具上、下模板具有高精度和长寿命,重复装配精度高。实践证明:模具结构可靠,加工的零件质量合格,生产效率高,对此类零件的级进模设计具有一定的参考作用。     

An approach to integrate manufacturing process information in part design phases

Design for Manufacturing (DFM) is the integrated practice of designing components while considering their manufacture (O’Driscoll, M., 2002. Design for manufacture. Journal of Material Processing Technology, 122, 318–321). The benefits of this practice have been widely acknowledged in the industry. Several techniques fall under the umbrella of Design for Manufacturing, and their implementation depends heavily on the context in which they will be applied. How to enhance their use by designers is still an issue. The use of a formalized design process, in which a software application is used to bring manufacturing knowledge to the forefront, would improve DFM implementation. In such a context, a fundamental issue is to define the manufacturing information that should be presented to the designer.This work addresses the capture and documentation of essential DFM information to make design decisions. Essential manufacturing information is that which can affect the fulfilment of functional requirements and product constraints. The proposed approach combines DFM techniques and principles of Axiomatic Design (AD) theory. The manufacturing information is represented by the concepts of Process Property (PP) and process Execution Variable (EV). The ultimate aim of the approach is to define manufacturing knowledge structures and develop a knowledge-based application for DFM.The approach was applied to a case study in which a connecting rod was the part to de designed and manufactured. The manufacturing processes selected were forging and powder metallurgy. The DFM information about these manufacturing processes, related to the connecting rod, was identified and formalized in a table-based data structure.     

护板多工位级进模设计

分析了护板件的冲压工艺性,介绍了护板级进模总体结构和排样方案。实践证明:该模具结构可靠,能保证产品质量,对此类零件的级进模设计有重要参考价值。     

不规则主体压铸模设计

通过对主体压铸件的结构工艺性分析,确定了模具结构设计方案,介绍了台阶分型面选择、立式缝隙浇口浇注系统设计、预复位推出机构设计和镶块镶拼结构设计。实践证明:模具结构可靠,满足铸件质量要求,对不规则压铸件的模具设计有一定的借鉴作用。     

支架件精密级进模设计与制造

分析了支架零件的工艺性和排样设计方案,介绍了模具结构及特点,并简要介绍了模具主要制造工艺。该模具结构不但解决了倒U形弯曲件出模困难问题,而且模具的可靠性、安全性及使用寿命显著提高。     

铰链垫片多工位级进模设计

分析了铰链垫片的工艺性,介绍了铰链垫片级进模总体结构设计和排样方案。实践证明:该模具结构合理、可靠,并能保证产品质量,对此类零件的级进模设计有参考价值。     

透明水箱热流道注射模设计

根据透明水箱表面质量要求高的特点,通过对塑件结构和工艺性进行分析,对不同浇口位置、普通流道与热流道方案的对比分析,确定了单点浇口的热流道模具设计方案,对模具设计要点及工作过程作了介绍,实践证明,生产的塑件合格,对同类产品的模具设计具有一定的借鉴作用。