汽车覆盖件成形过程及模具制造的数字模拟

介绍了汽车覆盖件冲压成形过程及其模具制造数字模拟一体化的流程设计和方法,给出了设计结构。论述了对冲压成形工序进行几何、材料和工艺的优化设计进行数字模拟的步骤;分析了模具制造数字模拟中应注意的问题;结合实例,阐述了构建汽车车身虚拟制造底层结构和关键技术。     

基于人工制造约束的三维拓扑优化设计方法

为了更好地解决三维拓扑优化工程实用化的问题,提出了基于人工制造约束的拓扑优化设计方法。该方法在拓扑优化过程中实时地监控拓扑优化结果,并借助设计人员的工程经验,实时地加入符合制造工艺成型的约束条件辅助计算进行机拓扑优化设计。钢结构拱桥算例中以有限元软件ANSYS为平台进行二次开发、以双向渐进结构优化法为核心算法通过人为干预实现了在拓扑优化过程中钢结构拱桥斜支撑向竖直支撑的转变。通过对比发现该方法的优化结果与实际拱桥模型结构相似,表明了该方法是有效的和可行的。     

基于Web的中小型制造企业仓储管理信息系统设计与开发

针对中小型制造企业的仓储管理信息系统的现状，利用J2EE架构技术设计了面向中小型制造企业的仓储管理信息系统，该系统具有良好的跨平台性和可移植性，能保证数据的一致性和安全性。     

车间现场信息采集技术研究与系统开发

为了提高制造系统的运行效率和透明度,探讨了具有反馈功能的制造系统控制模型和数控设备运行状态信息的采集原理。采用总线型以太网和串行通信接口相结合的结构实现了针对串口设备的车间现场信息采集网络, 并且提出一种基于PLC的DNC接口开发方法。该方法通过获取PLC中I／O端口的状态达到信息采集的目的,并将这些原始信息映射为管理层和数据库系统易于识别的格式。在以上研究基础上建立的车间现场信息采集系统应用B／S架构的软件开发模式,设计了基于网络的公共数据库,各部门以数据视图的形式共享信息,由此实现了灵活的信息采集与管理,并通过试运行证明了该系统的有效性和实用性。     

Study on manufacturing information sharing and tracking for extended enterprises

To solve manufacturing information sharing and tracking problems, three key issues are discussed. Firstly, templates are used to host manufacturing information, though they differ in their content and capacity. Secondly, the manufacturing information sharing and controlling method (MISCM) locates every information item at a discrete point on the manufacturing information plane according to its invisibility and unusability. And each user has several various privilege areas in the plane. According to the mapping relationship between the information set and the discrete point set, every user is entitled to access some information items. A template that contains these privileges is activated. Thirdly, when the manufacturing process is in progress, templates are instantiated. Then, a time-dependent instantiated template net (TIT-net) emerges. Based on its searching algorithm, information tracking is achieved through the history view and the in-time view. Finally, some examples show how these issues work together to implement a fluent, controllable and dynamic manufacturing information tracking mechanism.     

论金工实习设备维修管理制度的改革

就高等院校实习基地的金工教学设备,在市场经济条件下如何加强维修管理,并提出现行管理制度改革的建议.     

The technological features of manufacturing process for RF CHC TBM

The development of manufacturing technology for the ceramic helium-cooled test blanket module (CHC TBM) is performed in the framework of the concept for RF Federal government program to master the fusion nuclear energy and as a part of the development of DEMO blanket technology.The main technical approach to the development of CHC TBM manufacturing technology is to provide the “combined” analogy with design decisions of DEMO blanket structural elements.The manufacturing technology of CHC TBM structural elements (first wall cramp, load-bearing back cramp, tritium-breeding element and attachment system) has been proposed during the period of 2004-2007. The design details of TBM structural elements and critical issues of manufacturing technology development are also presented in this paper.     

压水堆-回路管道的铸造工艺及其国产化

工艺评定表明,1 000 Mw压水堆核电厂(CPR1000)原选用的主管道铸件Z3CN20-09M(法国牌号)不锈钢的化学成分符合RCC-M采购技术规范,但力学性能并不能完全满足压水堆核岛机械设备设计和建造规范(RCC-M)的要求.本文从金属学角度分析了Z3CN20-09M不锈钢抗蚀性特点和力学性能强化机理,确立了主管道铸件冶炼化学成份的内控标准,使CPR1000核电厂核岛主管道铸件(以下简称主管道铸件)的工艺评定在保持抗蚀性和可焊性特点前提下,各项力学性能指标均满足RCC-M标准,且有较大的裕度,离散度小,质量稳定,综合性能达到领先水平.     

在华跨国制造外包和中国国际物流

从计算在华跨国制造外包容量出发,用统计方法分析了在华跨国制造外包对中国经济与工业发展的影响及其在中国国际贸易出口物流中的地位;在剖析全球贸易物流格局演变的基础上,研究了中国在全球国际物流中的地位演变;阐述了在粤跨国制造外包对广东省经济与工业的影响及其在粤出口贸易物流中地位的演变.     

On the analysis of fracture mechanisms and mechanical behavior of AA5083-based tri-modal composites reinforced with 5 wt.%B4C and toughened by AA5083 and AA2024 coarse grain phases

In this article, the influence of AA2024 and AA5083 coarse grains on mechanical properties and failure mechanisms of AA5083-5wt. %B₄C tri-modal composite has been discussed. AA2024 and AA5083 powders (<100 µm) were added to mechanically milled AA5083-5 wt.%B₄C powders in 25 and 50 wt.% and the mixtures were consolidated using the hot press and hot extrusion techniques. Results indicated that by adding AA2024 and AA5083 powders as coarse grains, hardness and tensile strength of AA5083-5 wt.%B₄C composite decreased but ductility increased. Moreover, by adding AA2024 powders as coarse grains, fracture mode changed and cracks tended to grow through along AA2024/AA5083-5 wt.%B₄C interface rather than being arrested or deflected. It seemed that dislocation mobility and the interface between coarse grains and ultra-fine grains had the main role in determining the mechanical properties and failure mechanisms in tri-modal AA5083-B₄C composites.