钢结构架空管道支架的设计

管道支架属于特种结构,管架和管道两者形成一个空间体系而共同工作。根据不同管架的结构特征,合理选择管架类型,确定管架荷载、允许长细比及计算长度,正确分析计算管架内力,选择与管架匹配的管托和基础形式,对管架设计的科学性、安全性、经济性十分重要。     

转向齿条接触式感应淬火技术

根据试验及生产实践经验，简述了汽车转向齿条接触式感应淬火的操作方法。     

PLC控制侧窗自动冲孔模设计

采用PLC可编程控制器控制，步进电机分度，实现自动分度、自动冲孔、送料、退料的轴承保持架自动冲孔模，解决了传统的轴承保持架侧孔冲孔模机械方式分度，分度精度低，累积误差大，废品率高，冲裁速度慢，生产效率低等问题。     

三维紧致化存储系统中货架尺寸的优化研究

目的当存储系统出入口位于货架底端中点位置并采取双命令周期存储模式时,对系统尺寸进行设计,以使仓储的空间得到最大化利用。方法建立三维紧致化存储系统双命令周期行程时间数学模型,假设系统出入口位于货架底端的位置,分6种情形展开讨论,研究自动化仓储系统出入口位置的设计问题。结果通过模型优化求解,确定选择类型5(使a*=1.1,b*=0.63),系统的长高宽比例为1.1∶0.71∶1.2时,堆垛机运行效率最高。结论通过仿真得出,当三维紧致化存储系统中货架尺寸长高宽比例为1.1∶0.71∶1.2时,双命令周期下的系统期望行程时间最小,即三维紧致化存储系统在该比例下执行双命令存取操作,耗时最短。     

三峡升船机齿条及螺母柱间隙灌浆工艺试验

为了选择出合适的灌浆材料和灌浆工艺并模拟升船机齿条、螺母柱间隙灌浆的实际情况,分别进行了灌浆工艺试验与原型灌浆试验。灌浆工艺试验对比了3种国产灌浆材料和德国PAGEL灌浆材料,试验结果表明德国PAGEL灌浆材料物理性能指标和力学性能指标优于国产灌浆材料。在原型灌浆试验中,对灌浆设备选型、搅拌时间、模板密封、灌浆方式、灌浆流速参数控制等方面进行了试验研究,优选出适用于三峡升船机齿条、螺母柱接缝灌浆的材料和合适的灌浆工艺。以上试验效果明显,解决了灌浆密封难度大、易堵管等施工难题。     

含损伤缺陷的大型钢结构架极限承载预测方法研究

为了能够准确预报出大型钢结构架的极限承载,提高大型承载钢结构架的安全性,提出基于双重非线性理论和测试应力为基准的大型钢结构架极限承载预测方法。推导出以测试应力为参考真实反映钢结构架损伤缺陷的修正模型,实现了对大型钢结构架极限承载的预测。以实验室大型钢结构架模型为例,进行了极限承载实验研究,模型压溃实验所得数据与理论预测值进行了对比,比较结果十分接近,验证了该方法的正确性。     

Optimal storage rack design for a multi-deep compact AS/RS considering the acceleration/deceleration of the storage and retrieval machine

This paper explores the optimal storage rack design for a multi-deep compact Automated Storage and Retrieval System (AS/RS) considering the acceleration and deceleration of storage and retrieval (S/R) machine. The expected travel time under the single-command cycle and dual-command cycle for a random storage strategy is derived. Based on the travel time, the general models we propose calculate the optimal ratio between three dimensions that minimises the travel time under different speed profile scenarios. From the result, it is proven that the optimal storage rack design model in the constant speed situation can be treated as a special case of the model considering the acceleration and deceleration of S/R machine. Finally, this study investigates the effect of speed profile of S/R machine and fixing dimensions by various numerical experiments.     

h型钢冷床防扭技术改进

针对H型钢冷床在高温段运行中存在的变形扭钢问题展开研究,对步进梁冷床齿条进行改进,提高步进梁冷床齿条运行过程中的稳定性,克服了型钢冷却中的扭曲现象,提高了产品的合格率和生产效率。     

海洋平台用高强度齿条钢的研制

自升式海洋平台桩腿用厚规格A517Q高强度结构钢,要求具有高的强度及优良的低温冲击韧性。为了满足上述要求,在工艺上采用模铸、初轧及厚板轧制,并采用淬火加回火的调质工艺;在成分设计上,为得到回火后组织,保证高的强度和一定的淬透性能,主要通过Mo、B、Cr等元素的作用,同时加入一定数量的Ni。通过成分与相应的调质工艺配合,保证A517Q钢具有高的强度、高的冲击韧性及良好焊接性能。宝钢生产的127、152.4 mm厚的A517Q钢板制造的齿条已经成功应用在中海油923、924自升式海洋平台。     

Electroslag Remelting Withdrawing Technology for Offshore Jack-up Platform Rack Steel Manufacturing Process

Offshore jack-up platform rack steel must exhibit high strength and toughness as well as excellent welding properties.A high-quality large ingot is a prerequisite for obtaining a high-performance rough part.The electroslag remelting withdrawing(ESRW)technology using a T-shaped mold and bifilar mode was introduced to replace casting technology.Numerical simulation of the ESRW process was performed to determine the distribution of the temperature and velocity fields and to determine the optimum process for producing rack steels.Several A514 Qslab ingots with dimensions of 0.32m×1.40m×4.00 m were produced using ESRW technology in an industrial plant.The industrial test indicated that slab ingots produced by the ESRW method exhibited uniform chemical compositions and compact macrostructures.A 115.4mm thick plate was produced from the rough ingot after 11 rolling passes.Samples were obtained from different positions in the steel plate to test the mechanical performance and examine the microstructure,and the results revealed that the properties of the steel plate satisfied ASTM standards.The ESRW process improved the tensile strength and toughness of the slab ingot,enabling significant improvements in the anisotropy and low temperature toughness,which are critical for the development of rack steel for offshore platforms.