悬臂筛网振动筛在烧结成品整粒系统中的应用

莱钢烧结成品整粒系统的三次筛分和四次筛分，一直用直线振动筛。随着烧结矿产量的增加，原直线振动筛因其处理能力低、筛分效率低、运行成本高等已不能满足生产要求。悬臂筛网振动筛具有动态筛孔，且可使物料充分接触筛面，体积小、耗能低、筛粉效率高，经现场适应性改造代替了原直线振动筛。应用表明，筛分指数由8％降低到了6％，满足了生产工艺要求，年效益为1394万元。     

盘条和钢丝国际标准现状及我国标准与国际标准接轨的思考

综述了ISO TC17 SC17秘书处制定的最新盘条和钢丝国际标准的内容和特点 ,提出我国盘条和钢丝国家标准与国际标准接轨的“双向原则”及具体实施方法。     

Effect of Rare Earth Element Ce on Microstructure and Properties of Aluminum Rod for Electrical Purpose

The effect of rare earth element Ce on microstructure, electrical conductivity and mechanical properties was studied.Using optical microscope, scanning electron microscope, transmission electron microscope and X-ray diffractometer, the microstructure and phase composition of aluminum rod for electrical purpose were measured and analyzed.The results indicate that rare earth element Ce can considerably refine grain size of aluminum rod for electrical purpose,improve the regular distribution pattern of the impurity, such as silicon and iron which present in the aluminum matrix,form stable metal compound with pernicious impurity.This metal compound precipitates on the crystal boundary.As a result, the solid solubility of impurity in aluminum reduce, and the electrical conductivity of aluminum rod for electrical purpose is improved.It is found that the mechanical properties of aluminum rod for electrical purpose are improved by rare earth element in certain range of RE addition.     

Analysis of NEA C5MOX benchmark with computer code “cohint” based on interface current approach

Interface current approach to solution of neutron transport equation has been earlier used for LWR lattice problems. The analysis of the C5MOX benchmark is a opportunity to test its applicability to heterogeneous reactor problem. Computer code COHINT, which incorporates a routine for solution of neutron transport equation in X-Y geometry by interface current approach was used for this analysis by representing the fuel rod as a square one. Region interface angular fluxes are represented by a four-term expansion. It is found that the average pin power error is about 2.28 % (peak pin error 4.1 %) relative to reference calculations. Further improvement is possible by introduction of the capability to represent circular rods with in a square cell in COHINT.     

一种典型齿形紧配合面微动损伤机理研究

结合对连杆的动力学分析，对16V280ZJ型柴油机连杆齿状紧配合件结合面的损伤进行了分析研究，结果表明，齿面间复杂的微动疲劳作用加速了齿表面裂纹的萌生与扩展，是降低使用寿命的主要原因，研究结果对其它类型的柴油机连杆（如16V240）或其它类似的紧结合面损伤机理研究具有指导意义。     

辙叉贝氏体焊条连接修复组织性能研究

针对现场焊补及修复不便问题,本文提供了一种铁路钢轨及组合辙叉专用贝氏体焊条,该堆焊焊条焊前不用预热,焊后不用热处理。通过对该焊条连接及修复的组织性能特征分析,结果表明,无论是堆焊修复还是连接其焊缝组织都是粒状贝氏体,堆焊层显微硬度与基体基本一致,连接焊缝的冲击强度达到70J/cm2,焊条的组织性能满足贝氏体辙叉钢修复要求。     

解四阶杆振动方程的精细时程积分法

对于四阶杆振动方程初值和周期边界值问题,提出了截断误差阶为O(Δx6)的精细时程积分法.由于该方法是半解析方法,在时间域上可以精确计算,本方法不仅精确度高,还无条件稳定.数值算例进一步验证了上述结论,而且对大的时间步长和长时间计算均有效,是一种很实用的方法.     

发动机连杆裂解加工初始裂纹槽几何参数研究

分析比较了裂纹槽的设计位置、几何形状以及预制方法;对含有预制裂纹槽的C70S6钢连杆的裂解加工过程进行了数值模拟分析和连杆断裂剖分实验,给出裂纹槽几何参数对裂解力水平的影响规律.结果表明,在其他参数不变的条件下,裂纹槽深度对裂解力的影响最为显著,随着槽深增大裂解力锐减;提高锐度及减小张角可降低裂解力,但曲率半径为0.1~0.3 mm或张角>30°时,裂解力增幅较小且趋于稳定.研究结果对合理设计裂纹槽、降低切槽成本、提高连杆裂解质量具有参考价值.     

矿用汽车车桥推拉杆寿命预测分析

为准确预测矿用汽车车桥推拉杆的疲劳寿命,研究了路谱载荷与多轴疲劳理论相结合的有限元寿命分析方法.在实测路谱载荷下分析得出推拉杆的仿真寿命为354.98d,与实际使用寿命(270～540d)较为接近,表明应用该预测模式来估算推拉杆寿命的方法是可行的.     

RH真空室烘烤装置的改进

原 RH真空室烘烤装置升降小车采用齿轮齿条传动方式或链轮链条传动方式 ,都曾多次发生事故 ,改用液压推杆——链条传动方式后使用效果很好。