硅对GD钢下贝氏体组织形态及力学性能的影响

本文研究了不同硅含量的高强韧低合金冷模具钢(代号GD钢)经马氏体—下贝氏体复相处理后下贝氏体的组织形态、亚结构和数量,讨论了GD钢的成分、组织和性能之间的关系。结果表明,GD钢的硅含量对下贝氏体的相变过程和显微结构起决定性的作用。当GD钢的硅含量达到1.82％时,复相组织中下贝氏体呈准下贝氏体形态,且复相组织表现出最佳的强韧性配合。     

高密度三维封装技术

简要介绍为满足日益增长的低功耗、轻重量、小体积系统的应用需求而涌现出的多种裸芯片封装与多芯片叠层封装技术。详细讨论三维封装的垂直互连工艺。主要分析三维封装技术的硅效率、复杂程度、热处理、互连密度、系统功率与速度等问题。     

牵引式钢模台车在压力管道混凝土施工中的应用

针对压力管道混凝土的特点及技术要求,选择应用牵引式钢模台车对压力管道混凝土进行施工,取得了较好的效果.     

三维冲压成形客车件模具设计系统软件开发与研究

基于Solidworks三维平台，采用Access,Sql Server及VB编程语言，通过调用SolidWorks的API应用编程接口进行客车件冲压成形模具软件系统的设计和开发。论述了三维冲压成形模具的设计过程，并给出了三维冲压成形模具设计系统的体系结构和系统的设计实例。     

The effects of die shapes and additives on the physical and biodegradable properties of biodegradable cushioning extruded foams

In this study, efforts were focused on the effects of the operating parameters, i.e. die shapes (DS), PVA ratio (PR), additives (AT) on the physical and biodegradable properties of the corn/PVA extrudates. We also evaluated the extrudates as cushioning materials. The process variables were the operating, conditions, die shapes (○, ∞, ? and O ), PVA ratio (40%, 50%, 60%) and additives [sodium bicarbonate (NaHCO₃), calcium carbonate (CaCO₃) and calcium hydroxide (Ca(OH)₂)]. The experiment is a 4 × 3 × 3 factorial design. Samples of each treatment were collected and the physical, mechanical and chemical properties were measured and analysed using the PROC ANOVA and PROC CORR of the SAS 6.0 software package. 35 The experimental results indicated that: (a) The change of die shapes (DS) had a significant effect on the longitudinal expansion, bulk density, compressibility and biodegradability properties of the extrudates; (b) the change of PVA ratio (PR) had a significant effect on the longitudinal expansion, bulk density and compressibility, but no effect on the biodegradability properties of the extrudates; and (c) the change of additives (AT) had a significant effect on the longitudinal expansion, bulk density and compressibility, but no effect on the spring index of the extrudates. Copyright © 2003 John Wiley & Sons, Ltd.     

冰箱防护板冲孔模设计

介绍了防护板的结构特点 ,多孔冲模以及斜面冲孔模具的设计要点 ,并对斜面冲孔结构做了一定的改进 ,使模具的使用寿命和可靠性大大提高 ;加工精度的控制和保证 ,装配技术的改进 ,从而大大缩短了模具装配时间和制造周期。     

车厢内装饰件压形切口模设计

分析了车厢内装饰件的冲压工艺 ,着重介绍了车厢内装饰件压形切口模的结构。     

一种复杂空心叶片外形模具的改进

通过对某机一级涡轮叶片陶瓷型芯收缩的分析，介绍了一种在外形中调整型芯位置，从而达到调整蜡模叶片壁厚目的的机构，增加了壁厚调整机构的外形模具，在继承了原模具全部优点的基础上操作大为简化，壁厚调整准确，生产效率和蜡模叶壁厚合格率均有所提高。     

矩形拉伸件切边模设计

以DVR面壳为例介绍了矩形拉伸件切边模的结构设计及其计算方法。     

圆管冲圆弧模具CAD软件的研究与开发

本文介绍了利用VBA开发的圆管冲圆弧模具CAD软件及其程序设计问题。