Effects of the Fabrication Processes of NC-Si： H Films on Their Mechanical Properties

Studies of nanoindentation were performed on nc-Si：H films to evaluate the effects of the fabrication processes on their mechanical properties. It is observed that with the decrease of the SiH4 contents, the grain size of the films increases gradually, and as does the crystalline volume fraction. The smaller the grains become, the more homogeneous the films, and the more even the hardness as well as the modulus will be. The hardness and the modulus will increase with the substrate＇s temperature rising. The hardness and the modulus of the nc-Si：H films on the Si substrate prove to be higher than those on the glass substrate given the same technology parameters. How- ever, the films on the glass substrate appear to be more homogeneous.     

制造企业正在跨入知识时代

制造企业正在从工业时代跨入知识时代，制（手）造正在转向智造。传统的生产组织必须转变为创造知识的组织，特别是面向全球的学习组织。高水平的智力资源是制造企业的最宝贵的资产。     

片梭织机骨架的制造与装配

本文概述了片梭织机骨架的制造、装配中的难点及所采取的工艺措施。     

倾斜功能材料的制造技术及应用

本文简要介绍了热应力缓和型倾斜功能材料的制造技术及应用。     

超级巨无霸A380正式启动

２ ０００年１２月１９日在世界航空史册上 将具有重要意义。这天，在图卢兹举行的空客公司监事会上，空客公司的股东一欧洲航空防卫航天公司（ＥＡＤＳ）和英宇航公司（ＢＡｅ Ｓｙｓｔｅｍｓ）决定正式批准发起Ａ３８０项目。该机型就是此前被广泛宣传，受到航空制造界和航空运输业人士重点关注，称为是面向２１世纪机型的Ａ３ＸＸ． 在人类航空史上，最近一次宣布生产世界上最大型飞机是 １９６６年 ３月波音公司董事会批准Ｂ７４７的启动。具有鲜明的鹅头特征的Ｂ７４７—４００目前仍然是世界上最大型的飞机，通过垄断这部分最大型飞机…     

HISTORICAL PROCEDURES AND G-DSG METHOD BASED MANUFACTURING PLANNING

Oriented to CAD/CAM seamless integration, this paper presents an idea for synthetically considering the qualitative history model, which represents the whole course of modeling, and the quantitative geometry model, which contains the extended Brep model, CSG and feature pedigree. History model building captures in background the dynamic interactive definition of engineering requirement and then explicitly conveys the original intention to successive application layers, which isc onductive to the decision support of manufacturing planning in not only automatic geometry re-constructing but also machining set-up. G-DSG theory as an earlier achievement is applied to generate the topology-independent generalized mid-model as an input to manufacturing planning, which istherefore simplified and its accuracy is simultaneously improved. Manufacturing planning lays emphasis on optimizing the mapping in both geometry and function from part itself to detail machining scheme. Comparatively, process planning pays more attention to the mapping to those items like tool, fixture, etc. Theoretically, such an idea is also beneficial to realizing the parametric NC machining trajectory generation and maintaining its dynamic consistency with the update of the design model.     

产品生命周期评估的体系结构及其与绿色制造的集成关系

在总结了当前国内外产品生命周期评估研究现状的基础上,建立了产品生命周期评估的体系结构;在对LCA在绿色制造中的重要应用进行分析的基础上,建立了与绿色制造的一种集成关系.     

我国模具先进制造技术的发展

对模具的CAD/CAM技术、先进制造工艺及装备技术、镜面加工技术、测量及反向工程技术的现状和发展方向进行了综述.     

支持产品协同制造的质量管理信息系统

提出了一个基于Intranet/Extranet/Internet和ASP(Application Service Provider)方式的协同质量管理信息系统模型,为产品协同质量管理提供了一个完整的信息平台.介绍了系统体系结构,系统地论述了包含质量策划管理、产品质量管理、项目管理、支持性质量管理活动管理、质量改进管理、客户关系管理、供方关系管理等核心业务的功能模型,并针对开发实现的关键技术进行了讨论.      

闭截面型材的拉弯成形性

拉弯是型材的基本成形方法.截面畸变是型材拉弯成形中的常见缺陷,并对型材的回弹和变薄有交叉影响,型材拉弯成形性的分析评估远比板材成形复杂.提出了型材拉弯成形性的概念,建立了矩形截面型材拉弯成形性分析模型,基于有限元数值模拟研究了截面结构、相对高度和壁厚分布等几何参数对拉弯成形性的影响规律,从提高拉弯成形性出发提出了型材截面优化设计的原则.