高速铝箔轧制的润滑

铝箔轧制的特点要求轧制油具有低粘性和高油膜强度。铝箔轧制润滑属于混合摩擦范围。以混合好的轧制油补充油的消耗，可以稳定地维持轧制油成分，减小添加剂的消耗量。合理设计油箱尺寸，是缩短轧制油停留时间，避免轧制油失效的主要途径。     

轧制润滑对冷轧机振动的影响

以冷轧机系统的振动现象为研究对象,结合近年来的冷轧机振动问题的研究成果,探讨了轧制润滑液与冷轧机振动之间的关系,得出适当增加润滑液的摩擦系数,可以起到消振和减振的目的。轧制润滑液的摩擦系数主要受到压下量、轧制速度、润滑液浓度和温度、固体微粒的含量的影响,并指出对于增加轧制液的摩擦系数,从压下量和润滑液浓度两个方面进行调节更为合理,在以上调节未能达到所需摩擦系数的情况下可从固体微粒含量方面进行调节。     

混合润滑轧制入口膜厚模型

运用平均流动模型求解混合润滑轧制变形区入口膜厚问题时,提出了混合因子φm,它综合了流动因子φx和接触因子φc对入口膜厚的影响,简化了轧制润滑模型,计算和实验表明,在流体润滑条件下,表面粗糙效应形膜亦有一定的影响,也即混合因子φm还适用于流体润滑轧制,且修正了未考虑表面粗糙效应而引起的不足。     

铝板带轧制过程中的工艺润滑及影响因素

铝板带轧制工艺润滑不仅可以减摩降磨、节能降耗,而且可以改善轧后产品表面质量。在分析铝板带轧制工艺润滑机制的基础上,讨论轧制过程中润滑效果的影响因素,对铝板带轧制润滑工艺和润滑剂的改进有参考意义。     

轻金属的轧制润滑

由于铝材需要量的迅速增加,导致了铝材轧制技术的诞生.这种情况正与钢材轧制技术产生的情况相似.厚度为200～600毫米的半连续铸锭(为得到优质表面将铸锭铣面)在可逆式轧机上热轧成18～25毫米厚的板料.这种板料或相同厚度的连铸连轧板在400～200℃下温轧成2～6毫米厚的板材,然后卷卷.热轧带卷以高达600米/分的速度在单机架轧机(也可是可逆式的)或二重到四重轧机的串联式轧制生产线上轧到较薄厚度.通常带卷的最薄厚度(罐毛料)为0.15～0.25毫米.更薄的箔材通常是将其毛料退火,然后在不     

高速轧制中的摩擦与润滑

在日常生活中利用和防止摩擦的现象到处可见,如汽车行驶就是利用了轮胎和路面之间存在的摩擦,汽车的制动也是将摩擦原理用于制动器上。当大件货物放在地面上拖行时,如果地面上有许多水,移动起来就比较容易;假若撤上油再把滑动改为滚动,搬动起来会更加方便。古代劳动人民建造埃及的金字塔和中国的古长城时就利用了以上减小摩擦的原理,实现巨大建筑材料的搬运。 国民经济生产的每一个领域内,摩擦与润滑的应用都很普遍。在钢     

宽带钢热连轧机组润滑轧制技术研究

采用ＰＣ控制器控制给油时序多种控制技术，实现了在宽带钢热连轧机组Ｆ１￣Ｆ７机架上的润滑轧制，以每吨钢消耗０．２Ｌ油量使精轧机组总功率平均下降１０％，轧制力降低８％￣２５％，轧辊消耗降低３０％左右。     

铝板带轧制润滑作用机理及对轧后质量的影响

针对铝板带冷轧过程中的润滑状态、润滑作用机理及对轧后表面质量的影响进行深入研究。在四球摩擦磨损实验中测试分析了轧制油的摩擦学性能,进而在轧制实验中获得了轧制润滑特征曲线以及不同的润滑条件下轧后表面形貌和粗糙度。结果表明:铝板带冷轧变形区润滑状态为边界润滑,可以获得优异的轧后表面质量,同时与无润滑轧制相比,在边界润滑状态下轧制,其最小可轧厚度最大可降低50%,表面粗糙度Ra最大可减小53%。     

太钢1549mm热连轧机工艺润滑技术的开发

介绍了太原钢铁(集团)有限公司热连轧厂在热轧工艺润滑技术开发中进行的各项准备工作和技术改进；并选择不锈钢、硅钢、普碳钢，从轧制力、轧制公里数、轧辊磨损情况等方面进行试验，得出采用工艺润滑后，轧制力降低、轧制量增加且轧辊表面及板形有明显改善。     

冷轧轧制油特性的探讨

本文介绍了窄带钢冷轧机组在现场生产中,使用乳化状轧制油遇到的一些情况,同时讨论了冷轧轧制油的几个工艺特性及理化指标。     

Two novel rolling processes of porous metal preforms prepared by spray deposition technique using conventional rolling mill

For the spray deposited preforms with the porosity up to 10–15%, densification processing is necessary to produce fully dense products. In this paper, two novel processes named as “Frame-Confined Rolling” and “Ceramic Rolling” are presented. The experimental results show that these two methods can improve the workability of the porous preforms without forming cracks on surface and edge during rolling.     

Study on ferrous metal electrodes in nitric acid solutions

The electrochemical and spontaneous behaviour of the ferrous metals (iron, nickel, cobalt) in nitric acid depends essentially on the concentration of the acid solutions. Therefore potentiostatic investigations were conducted in a wide range of nitric acid concentrations (1 – 24 M). These metals are active and show strong dissolution in dilute nitric acid solutions. In concentrated nitric acid (14.6 M), iron and nickel are passive. Cobalt passivation occurs only in fuming nitric acid (24 M). In medium concentrations (between the concentrations in which active dissolution and passivation occur) the polarization curves of the metals are complex, showing a hysteresis cycle and exhibiting a multiplicity of steady states. Although all the metals (iron, nickel, cobalt) show some analogous characteristics, it seems that the passivating processes differ, particularly for cobalt which is poorly passivated.     

黑色金属半固态压铸模设计

通过黑色金属零件杠杆的半固态压铸模设计，提出了黑色金属半固态压铸模的设计要点，研究了设计中涉及的压铸机选择，压室的设计，成形部分材料的选择，浇注系统的设计，模具加热，冷却系统的设计等关键技术问题，得出了解决问题的方法。     

四切分棒材轧制技术在连轧厂的应用

介绍了广州钢铁集团连轧厂引进的四切分棒材轧制技术和主要设备概况;并针对原工艺设备存在的问题,采取了多项措施:如改进料形,精心进行速度调整,严格切分箱装配及安装制度等。改进后年效益在500万元以上。     

万能法轧制重轨及其在马钢的应用

简要介绍了国内钢轨的生产现状及与国外的差距．重点介绍了万能轧制法的应用概况、孔型制度、设备特点及发展近况；分析了万能轧制法在马钢应用的可能性及存在的问题。     

Lubricity of volatile lubricants in sheet metal rolling

A series of experiments is carried out by using a rolling type tribometer to investigate the lubricity of the volatile lubricants at high speed forming. The roll material is the die steel alloy SKD11, and the workpiece material is the mild steel SPCE with a rough surface and the aluminum alloy A3004 with a smooth surface. Experimental results show that the friction coefficient decreases with increasing working velocity for both SPCE and A3004, in any lubricant. With an increase of reduction in thickness, the friction coefficient decreases for SPCE, but increases for A3004. Some volatile lubricants have the same lubricity as the generally used mineral oil with low-viscosity by judging from the value of friction coefficient, the surface appearance of rolled workpiece and the roll surface damage.     

极薄带微轧制中的尺寸效应

试验发现冷轧纯铝、纯铜和低碳钢极薄带时,当轧件厚度减薄到特定的阈值以下,发生了抗拉强度随轧件厚度减薄而降低的尺寸效应。介绍了极薄带轧制时发生尺寸效应的现象,简要分析了尺寸效应产生的原因,给出了典型金属材料出现尺寸效应的阈值,并对轧制极薄带时发生尺寸效应所带来的有益效果—超延展现象进行了介绍。     

极薄带微轧制中的系列新发现

在对极薄带微轧制的研究中,陆续发现一系列用传统轧制理论不能解释的新现象,如工业纯铜的超延展现象、脆性材料的非典型塑性现象、异种金属多层复合中的变形诱导反应扩散现象等。这些新现象与微成形中的尺寸效应有关,对其进行深入研究,一方面,能够有助于揭示微成形的深层规律,加深对塑性变形本质的认识;另一方面,有助于在微成形领域产生新思路,开发微成形新工艺,促进微成形产品开发,推动微成形技术的进步。     

Search for filler metal for welding of ferrous alloys to titanium

Abstract

The use of a filler metal to facilitate the gas tungsten arc (GTA) welding of ferrous alloys to titanium alloys has been investigated. Semi-empirical rules have been applied to identify alloying elements that would resolve the important problems of brittle intermetallic formation and weld cracking. Vanadium was found appropriate. The GTA welds between a low carbon steel and Ti–15V–3Cr–3Sn–3Al made with a vanadium filler wire resisted cracking better than comparable autogenous welds. However, the presence of a hard, brittle eutectic microconstituent along the ferrous side of the fusion boundary drastically limited the gain in weldability. As anticipated, analysis of GTA welds produced with vanadium filler wire suggested the presence of a ternary (Fe,Ti,V) single phase. Although cracking was reduced with vanadium, the practical benefit of a vanadium filler wire for GTA welding is small because the weld metals remain very hard and brittle.     

带钢轧制负荷的研究

本文在研究C Mn钢带钢热连轧再结晶软化程度的基础上 ,揭示其对实质应变及轧机负荷的影响 ,与传统的计算轧制压力方法相比 ,考虑奥氏体再结晶软化不充分的影响后预报和实测符合更好 ;对带钢热连轧的轧制压力计算 ,中轧阶段选用Sims式、精轧阶段采用才利柯夫式 ,对发生完全再结晶软化的道次偏差不大 ,但若发生部分再结晶 ,所得结果明显偏低