低成本高比重细长钨钉配重零件的研制

本文采用传统的粉末冶金压制成形工艺,通过混料、压制、脱胶、烧结和机加工,可生产出完全符合要求的高比重细长钨钉零件。与注射成形工艺相比,简化了生产工艺,提高了生产效率,大大降低了生产成本,取得了良好的经济效益。     

浅谈钢板桩围堰的设计与施工

主要阐述傍海大桥水中承台施工中钢板桩围堰的设计与施工,指出采用理论计算法进行钢板桩围堰的设计能够较为真实地反映钢板桩的实际受力状态,从而具有较大的安全性,确保了承台的施工质量,有效加快了施工进度。     

基于Eclipse框架的嵌入式IDE实现

可扩展性框架为软件开发提供了统一的机制，使软件开发者能更专注于软件本身的功能和实现，从而大大缩短软件的开发周期，提高软件的移植性和扩展性。该文介绍了Eclipse的插件，扩展点以及插件发现机制，并探讨了如何利用Eclipse的可扩展性框架进行IDE开发，在此基础上完成了基于Eclipse框架的嵌入式IDE的实现。     

不同方法制备的温压粉末形貌及工艺性能

温压粉末质量是温压工艺成败的关键，应据成品件的用途和成本要求选择不同的制粉方法。针对高密度高性能温压零件要求，研究和分析不同制粉方法对Fe-2Cu-2Ni-1Mo-1C（质量分数，％）温压粉末形貌及流动性和松装密度的影响之后，发现：用不同方法制备的粉末在形貌上有很大差异，在室温与130℃均有良好的松装密度与流动性，且多次循环加热对其流动性和松装密度都没有不良影响，而部分扩散预合金粉末的综合特性最佳。     

Mechanical properties and tribological behavior of a cast heat-resisting copper based alloy

Mechanical properties and tribological behavior of a novel cast heat-resisting copper based alloy are investigated. The corresponding properties of a commercial aluminum bronze C95500 (ASTM B30) are compared with the alloy. The results show that the alloy possesses better mechanical properties and tribological behaviors than that of C95500 at elevated temperature. The tensile strength, elongation and hardness at 500℃ are 470MPa, 2.5% and HB220, respectively. The wear rate of the developed alloy at ambient and elevated temperature is about one-sixth and one-fortieth of that of C95500, respectively. The alloy is very suitable for ma-nufacturing heat-resisting and wear-resisting parts. Major strengthening mechanisms for the alloy are solution strengthening and the second phase strengthening.     

引水隧洞TBM拆卸洞室开挖施工方法

某无压引水隧洞TBM拆卸室由于断面尺寸过大,围岩较为软弱,复杂多变,文章对于其开挖方法及工艺流程进行概述,可为同类工程施工作业提供借鉴。     

低碳高强度Q620D结构钢研制

通过合理的组织、成分设计,并根据成分特点及钢种级别确定了合理的冶炼及加热工艺,轧制及热处理工序采用TMCP(Thermo mechanical Controlled Process)+回火工艺,成功开发了Q620D级低合金高强度结构钢板。该钢种组织以贝氏体为主,还有少量针状铁素体,晶粒细小,具有较高的强度和优良的冲击韧性。     

圆柱磁致伸缩棒在交变磁场中的力学行为研究

以设计的超磁致伸缩换能器的实物模型为基础,建立了换能器的轴对称的有限元模型,对主要在磁-机耦合场作用下,其中的超磁致伸缩棒在交变磁场中的力学行为进行有限元分析,从而为超磁致伸缩换能器的深入研究提供了依据.     

交叉开发环境中的目标机代理设计

当进行嵌入式应用开发时，需要利用宿主机开发环境中的多种工具，例如交叉编译器、远程调试器、命令解析器和实时资源浏览器。不同的主机端工具需要支持主机-目标机通信，并会产生许多不一致性，使得目标系统的设计变得相当复杂。该文提出了一种实现主机端工具与目标系统交互的通信机制，在自主嵌入式实时操作系统ReWorks中，设计开发了一个目标机代理。     

Die wall lubricated warm compaction of iron-based powder metallurgy material

Lubricant is harmful to the mechanical properties of the sintered materials,Die wall lubrication was applied on warm compaction powder metallurgy in the hope of reducing the concentration level of the admixed lubricant.Iron-based samples were prepared by die wall lubricated warm compaction at 175℃,using a compacting pressure of 550MPa.Emulsified polytetrafluoroethylene(PTFE) was used as die wall lubricant.Admixed lubricant concentration ranging from 0 to 0.5% was tested.Extremely low admixed lubricant contents were used.Results show that in addition to the decrease in ejection forces,the green density of the compacts increases with the decrease of admixed lubricant content until it reaches the maximum at 0.06% of lubrcant content,then decreases with the decrease of admixed lubricant content.The mechanical properties of the sintered compacts that contain more than 0.06% admixed lubricant are better than those of the samples that contain lesser lubricant.No scoring was observed in all die wall lubricated experiments.