连轧管机组发展历程及生产技术

近40年连轧管机组得到大力发展,设备年生产能力已达2000万t。介绍了连轧管机组的应用范围及特点、发展历程及生产技术的发展情况;主要介绍了锥形辊穿孔机、三辊连轧管机、张力减径机在质量控制技术等方面的新工艺,探讨了连轧管机组进一步发展的方向。     

Φ90mm圆盘延伸机前卡钢分析

探讨了造成Φ90mm圆盘延伸机前卡钢的原因,分析了轧件轧制过程中的第一、第二次咬入的受力情况,提出了预防前卡钢的措施。该措施实施后,基本消除了前卡钢现象。     

双燕尾快装导卫在连轧线上的应用

为了快速安装棒线材轧机的导卫装置,自行设计了双燕尾快装导卫装置,该装置具有结构简单、操作容易、更换迅速、安全性高等优点,更换导卫时间由每次4－5min降至不足15s。     

热连轧精轧宽度控制技术的研究及应用

在热轧带钢其他尺寸精度普遍较高的情况下,宽度控制精度的提升变得越来越重要。提出了一种新的精轧带钢宽度控制综合解决方案：针对带钢头部宽度控制,开发精轧机架冲击速降自学习模型,以减少带钢头部拉窄现象;通过合理配置精轧活套张力稳定因子,减少带钢中部宽度波动现象;通过精轧宽度反馈控制和宽展预测模型修正功能,提高带钢全长宽度精度。相关研究成果已成功应用于宝钢集团某热轧产线三电自主集成改造项目中,改造后带钢宽度控制精度得到显著提高。     

湿式陶瓷球磨机设计中经验数值选取的研究

湿式陶瓷球磨机是广泛用于生产陶瓷原料的细磨设备,根据多年陶瓷机械设计的实际经验,在保证生产效率的同时,为节约电能消耗、提高设备的可靠性和降低设备成本,对湿式陶瓷球磨机设计中主要技术参数选择、主要尺寸设计、传动方式选定和结构设计的经验数值选取进行了深入研究和归纳总结,以供参考。     

基于风资源测评的化德风电场二期工程的风机选型初选规划

大规模利用可再生能源,是世界各国发展的重要战略规划.其中,发展最快的是风能.占全国风力资源量39.9%的内蒙古自治区,成为了我国风能开发的前沿阵地.位于内蒙古化德县内的华能国际化德大地泰泓风电场,在已有风电场建设的基础上,规划建立二期工程.本规划运用风资源测评方法,借助化德县气象站作为风电场测风的参证气象站,利用多年的气象数据,对1260号测风塔的数据进行了修正,同时把风资源测评和风电场经济性统一起来,完成了化德风电场二期工程的风机选型初选规划.     

Multi-objective optimization of rolling schedule based on cost function for tandem cold mill

In terms of tandem cold mill productivity and product quality, a multi-objective optimization model of rolling schedule based on cost fimction was proposed to determine the stand reductions, inter-stand tensions and rolling speeds for a specified product. The proposed schedule optimization model consists of several single cost fi.mctions, which take rolling force, motor power, inter-stand tension and stand reduction into consideration. The cost function, which can evaluate how far the rolling parameters are from the ideal values, was minimized using the Nelder-Mead simplex method. The proposed rolling schedule optimization method has been applied successfully to the 5-stand tandem cold mill in Tangsteel, and the results from a case study show that the proposed method is superior to those based on empirical formulae.     

基于惩罚项的热连轧轧制规程多目标函数优化

为了解决传统热连轧负荷分配优化普遍采用约束方法进行求解时求解步骤繁琐、不容易获得最优解的问题,提出了一种惩罚函数算法.通过引入函数惩罚项,将多目标函数约束求解问题转化为无约束求解问题.建立了带有惩罚项的轧制力、板形、功率和温度的单目标函数,进而采用线性加权求和法建立了综合多目标函数.利用Nelder和Mead单纯形解法则进行求解,简化了求解的步骤,最终得到了兼顾轧制力平衡、板形最优及温度合理的负荷分配方案.实际应用效果表明,与传统负荷分配方式相比,基于多目标优化得到的轧制规程更符合实际生产要求,具有良好的应用前景.     

Algorithm design and application of novel GM-AGC based on mill stretch characteristic curve简

As the spring equation is limited to the accuracy of mill stiffness and the linearity of the mill spring curve, the traditional gaugemeter automatic gauge control （GM-AGC） system based on spring equation cannot meet the requirements of practical production. In allusion to this problem, a kind of novel GM-AGC system based on mill stretch characteristic curve was proposed. The error existing in calculating strip thickness by spring equation were analyzed first. And then the mill stretch characteristic curve which could effectively eliminate the influence of mill stiffness was described. The novel GM-AGC system has been applied successfully in a hot strip mill, the application results show that the thickness control precision is improved significantly, with the novel GM-AGC system, over 98.6% of the strip thickness deviation of 3.0 mm class can be controlled within the target tolerances of ±20 μm.     

Influence of surface roughness on flotation kinetics of quartz

Surface roughness of quartz particles was determined by measuring the specific surface area of particles. The wettability characteristics of particles were determined by measuring the flotation rate using a laboratory flotation cell. Experimental results show that the rod mill product has higher roughness than the ball mill product. For the particles with larger surface roughness, the flotation kinetics constant is also higher. Finally, empirical relationships between surface roughness (r) and the flotation kinetics constant (k) of quartz particles as k=A+Br+Cr ^0.5lnr+D/lnr+E/r and k=A+Br are presented, in which A, B, C, D and E are constants related to experimental conditions and mineralogical properties of mineral.