通过成型工序解决彩偏磁芯产品船效应的工艺原理及探讨

为方便DY生产厂家调试、装配，彩偏磁芯的形状上（切割筋两侧）设计有两个弹簧夹槽，弹簧夹槽的设计造成了磁芯槽向和非槽向的体积压缩比差异，在毛坯压制过程中，形成槽向、非槽向的密度差异，最终在烧结时由于密度的差异致使收缩不同而产生船效应废品。本文针对彩偏磁芯产品在生产过程中船效应废品的出现原因及解决方法等做了系统的阐述，提出了通过改变模具形状、粉料分布来解决弹簧夹槽造成的密度差异，分析了在生产中通过模具及成型方法的调整来控制彩偏磁芯船效应的途径。     

深水抛投砂砾石料的渡汛保护研究

 三峡工程大江截流是一、二期工程的转折点，平抛垫底是确保大江安全截流的重要举措。由于戗堤部位平抛石渣料、围堰防渗墙区平抛砂砾石料数量巨大，需在1997年汛前抛投一部分，因此存在安全渡汛问题。从现场实际情况出发，运用动、定床模型试验，并从理论上加以分析论证，提出了付诸工程实践的高低坎渡汛保护措施，得到了较好的原型验证效果。     

鞍钢铁路跨线桥预弯复合梁的施工与应力控制

鞍钢铁路跨线桥改造采用型钢预弯复合梁，降低了梁高，使桥下净空满足工程要求，本文介绍预弯复合梁的结构组成、施工工艺及应力控制。     

基于DELPHI的卷接机组MLP部分的实现

卷接机组MLP部分的实现包括人机界面和接口两部分,均用DELPHI语言来编写,由于卷接机组的整套系统采用CANBUS的总线通讯方式,所以MLP的接口即为PC机与CAN控制器之间的并行接口,采用的是内嵌汇编的方法来实现。     

The potential for mechanical design compilation

Significant potential exists for engineering design research to produce viable approaches to automatic compilation of mechanical systems.     

我国淀粉油田化学品的研究进展

综述了淀粉油田化学品在我国的研究状况，反映了这一领域的主要内容、存在问题及其发展动向。     

灌注桩施工监理控制

结合灌注桩监理各个阶段的工作实践，从预控、防控、补充控制等角度对桩基施工进行了论述，提出了主动控制模式，解决了桩基监理中的常见问题，以达到质量优良、业主满意的程度。     

小浪底工程排沙洞环形预应力混凝土施工

小浪底水利枢纽工程的３条排沙洞，洞身７０％以上采用后张法无粘结预应力混凝土衬砌。其张拉系统的施工主要包括钢绞线的就位，固定，锚具槽，锚具及张拉设备的安装，张拉等步骤，施工工艺严谨。三维有限元分析结果表明，张拉时锚具槽附近将出现明显的应力集中，为此，采取了分步张拉，加箍筋等措施，达到了对预应力的控制，也避免了产生贯穿性裂缝。     

Bake Hardening of Hot Rolled Multiphase Steels under Biaxial Pre‐strained Conditions

Multiphase steels show a strong bake hardening effect being of importance for shaping of car body structural parts. The raised yield strength is exploited for improved crash resistance. Especially the automotive industry has a growing interest in using this effect. Normally the bake hardening effect is examined in tensile tests whereas under industrial conditions shaping of structural parts shows a wide spread of stress strain behaviour, from uniaxial conditions over plain strain to biaxial ones. So it is obvious that the bake hardening behaviour of a material cannot be described with results of the uniaxial tension test only. To give a first answer to this question, the dependence of the bake hardening effect on different biaxial prestrains was investigated for several hot rolled multiphase steels using various baking temperatures and holding times whereas the bake hardening effect under uniaxial prestrain had already been examined in [5]. Considering the choices to generate biaxial strain, a Marciniak forming tool with a diameter of 250 mm mounted on a 2500 kN hydraulic press was chosen. For control of plastic deformation and adjustment the non‐contact measuring system ARGUS, was used. To reduce the quantity of experiments “Design of Experiments” and statistical methods were applied for a martensitic steel, a dual phase steel, a complex phase steel, a ferrite‐bainite steel, and a retained austenite steel known as TRIP, all in hot rolled condition. As a result, a formula for yield stress, tensile strength and residual deformability was developed. Furthermore, a method was found to predict easily whether a steel under investigation is qualified for additional experiments in regard to bake hardening or more exactly its response to different baking temperatures and holding times.     

白石水库工程建设中新技术的研究与应用

白石坝坝址位于气候条件恶劣的北方严守地区，坝体结构复杂，为此开展了一系列攻关课题的研究，并应用到白石水库工程建设中，其内容包括：（１）对施工导流进行风险决策分析；（２）将ＲＣＣ配合比用于ＲＣＤ施工，发展了碾压混凝土筑坝技术；（３）底孔采用全过程仿真计算技术进行设计；（４）溢流坝采用异型宽尾墩挑流消能；（５）在坝体越冬层面上下游采取预留缝措施；（６）对旧ＳＤＭＱ１２６０／６０型门机进行技术改造；（７