旋风铣削——M48～M120大型内螺纹的数控加工

本文从旋风铣削的加工原理、工艺方法、旋风装备、螺纹参数计算到数控程序设计等方面进行了全面的研究,并通过与生产企业结合,该研究成课已进入实际应用阶段并取得了良好的实际效果,这一研究成课对于重大装备制造业中的大型内螺纹的加工具有重要的指导意义及推广价值。     

轧钢开坯车间工作辊道和运输辊道的设计与计算

阐述了轧钢开坯车间的辊道布置、辊道设计、参数的选择以及传动电机功率的设计、计算等方面的基本原则 ,给出了具体实例     

气流磨工艺对烧结NdFeB磁体组织与性能的影响

采用速凝法制备NdFeB薄带,再经氢破制粉、压型、烧结、热处理制备NdFeB永磁体,通过激光粒度分布仪、光学显微镜以及AMT-4磁学特性测量仪等手段表征磁体的组织和性能,考察气流磨工艺对磁体组织和性能的影响规律.研究结果表明:气流磨分选转速越快,磁粉粒度越细小,制备磁体的磁学性能先增加后减小,当气流磨分选转速为3 400 r/min时,制备磁体组织均匀,剩磁、矫顽力、最大磁能积分别达到14.19 kGs、907.44 kA/m和397.28 kJ/m3.     

Effect of controlled rolling/controlled cooling parameters on microstructure and mechanical properties of the novel pipeline steel

The study of controlled rolling/controlled cooling process parameters which affect the microstructure and mechanical properties of a novel pipeline steel has been optimized by the orthogonal experiment with four factors and three levels in this paper. However, the parameters of thermo-mechanical control process （TMCP） optimized by the Gleeble-3500 hot simulator could not satisfy performance requirements of the X100 pipeline steel. In order to improve the performance of this steel, the influence of finish cooling temperature （FCT） on the microstructure and property is studied in detail. It is found that, as this steel is thermo-mechanically treated by this set of parameters （the start heating temperature, finish rolling temperature （FRT）, FCT and cooling rate of 1,180 ℃, 810 ℃, 350 ℃ and 35 ℃/s, respectively）, the micro- structures are mainly composed of granular bainite （GB） and acicular ferrite （AF）. The effective grain sizes are below 20 μm; the steel reaches the optimal balance between the strength and the toughness; the yield strength is 695 MPa; the tensile strength is 768 MPa; the elongation is 16.6 %; the impact energy is 262 J at room temperature. All indexes could meet the requirements of X100 pipeline steel.     

武钢森吉米尔轧机工作辊光纤激光无序毛化试验

利用JGK6180X60-10型轧辊激光毛化/强化机组开展森吉米尔轧机工作辊激光毛化试验,然后直接在工作辊上观察毛化区域表面形貌、测量毛化区域表面粗糙度,并做相应分析;试验结果表明,该机组能够实现森吉米尔轧机工作辊表面的无序毛化加工。在本试验条件下,当激光光斑轴向点间距小于等于0.03mm时,毛化效果开始呈现出无序状态。     

L3在宝钢2050热轧板坯质量管理上的应用

作为热轧单元生产组织最重要的原料,连铸板坯的质量直接影响热连轧产品的最终实物质量水平。宝钢2050热轧产品覆盖范围广,涉及钢种繁多,许多出钢记号的板坯因其生产工艺的特殊性,在质量管理上有较多特殊要求,板坯质量管理的难度很大。2050热轧L3系统改造后,在原有板坯质量管理功能基础上增加了很多新的功能,形成了独具特色的板坯质量管理方法。     

厚板轧机工作辊弯辊液压管路系统改造

采用设计的过渡块消除了阀台出去的管路相对集中和管路复杂、弯头、三通多的问题,便于日常点检和维护。在振动大的部位采用软管连接方式,减少整个管路的受迫振动带来的负面影响。     

基于减聚类ANFIS模型的船舶横摇运动实时预测

为准确高效地预测船舶在波浪中的航行状态以保证人员、货物和船舶的安全,提出一种基于减聚类的自适应神经模糊推理系统(Subtractive Clustering based Adaptive Neural-Fuzzy Inference System,SC-ANFIS)模型.SC-ANFIS模型使用减聚类算法对输入样本进行聚类分析,得到模糊规则数,并建立神经模糊推理系统,再使用结合BP算法与最小二乘估计算法的混合算法对建立的预测系统进行优化训练,得到最优的预测系统模型,并使用自相关分析确定预测系统模型的输入.运用该模型对大连海事大学科研教学船"育鲲"号的横摇运动进行实时预测,结果验证了该方法可行、有效,并具有较高的预测精度.     

Relationships between clubshaft motions and clubface orientation during the golf swing

Since clubface orientation at impact affects ball direction and ball spin, the ability to control clubface orientation is one of the most important skills for golfers. This study presents a new method to describe clubface orientation as a function of the clubshaft motions (i.e., swing plane orientation, clubshaft angle in the swing plane, and clubshaft rolling angle) during a golf swing and investigates the relationships between the clubshaft motions and clubface orientation at impact. The club motion data of driver shots were collected from eight skilled golfers using a three-dimensional motion capture system. The degrees of influence of the clubshaft motions on the clubface orientation were investigated using sensitivity analysis. The sensitivity analysis revealed that the swing plane horizontal angle affected the clubface horizontal angle to an extent of 100%, that the clubshaft angle in the swing plane affected both the clubface vertical and horizontal angles to extents of 74 and 68%, respectively, and that the clubshaft rolling angle affected both the clubface vertical and horizontal angles to extents of -67 and 75%, respectively. Since the method presented here relates clubface orientation to clubshaft motions, it is useful for understanding the clubface control of a golfer.     

液体对轮轨滚动接触疲劳作用下的钢轨表面裂纹扩展机理的影响

为研究液体渗入钢轨表面裂纹对铁路造成的安全问题,通过计算液体介质渗入钢轨表面裂纹后不同接触载荷以及轮轨表面摩擦因数条件下裂纹尖端的应力强度因子,对裂纹扩展方向和扩展速率进行分析,总结滚动接触载荷作用下液体渗入对钢轨表面疲劳裂纹扩展机理的影响.