带钢"起筋"成因分析与对策

对热轧带钢在冷轧过程中产生的"起筋"缺陷进行了分析.通过大量统计数据,分析了"起筋"位置、成因、"起筋"卷局部高点、凸度以及楔形之间的关系,并对热轧工艺进行了改进,取得了很好的效果,保证了断面适当的大凸度、小楔形和适当的局部高点,大大降低了带钢"起筋"率,改善了产品质量.     

热轧板形对冷轧钢带起筋的影响研究

针对热轧板形不好导致冷轧带钢起筋问题,从热轧工序分析原因,得出凸度小楔形大、轧辊磨损不均匀等问题是导致起筋的重要原因,并对热轧的辊形配置、窜辊模型、工艺制度等进行优化。优化后热轧带钢断面形状有很大的改善,带钢板形质量明显提高,带钢在冷轧中出现起筋缺陷的比例明显下降。     

冷轧边部鼓包缺陷分析与对策

分析了带钢冷轧过程中出现的边部“鼓包”缺陷以及对应的测量统计数据,认为热轧带钢局部高点是导致缺陷的主要原因,此外热轧板形凸度、楔形和轧制公里数对缺陷产生也有一定影响.从组织和轧制应力方面分析了带钢局部高点产生的原因,通过改进生产工艺使“鼓包”缺陷明显减少.     

热轧带钢局部高点产生机理及控制研究

冷轧带钢生产过程中出现的"起筋"缺陷问题与热轧带钢局部高点产生有密切关系,加强热轧工序板形控制,可减少局部高点对冷轧带钢生产的影响。本文通过对热轧带钢局部高点产生机理分析,提出优化策略,为热轧带钢局部高点控制研究提供依据。     

冷轧基板起筋成因分析及控制实践

针对1 450、2 032 mm热连轧线生产的冷轧基板在下游工序出现的批量起筋缺陷，结合两条热轧线的装备控制特点,从板形控制、轧制工艺规范管控的变化对其产生原因和机理进行分析，得出热轧带钢凸度控制失稳是导致起筋的重要原因。通过进行HVC板形控制模型的优化及生产工艺管理制度的调整，实现轧制过程的“均匀变形、板凸度一致”控制，保证带钢断面质量及凸度命中效果，冷轧产品起筋缺陷发生率同比下降95.12%，产品质量得到明显改善。     

热轧辊型技术对冷轧钢卷局部突起缺陷的抑制

为解决由热轧带钢不良断面形状遗传到冷轧带钢而引起的钢卷局部突起缺陷,在分析猫耳形磨损辊型对热轧带钢断面形状不良影响的基础上,提出了以抑制热轧带钢边部增厚和局部高点相对高度为目的的工作辊余弦辊型.模拟计算和实验表明,余弦辊型明显改善了带钢断面形状、降低了边部增厚和局部高点的相对高度,解决了冷轧钢卷局部突起缺陷问题,并为现场解决类似问题提供了新思路.     

热连轧带钢断面形状的修正模型及其应用

 为实现热轧带钢断面凸度和局部高点的准确预报,基于模型、传递和遗传等多因素考虑,从轧机承载辊缝对带钢断面形状的传递效应角度出发,建立起热轧带钢断面形状修正模型,定量分析了带钢厚度和压下率等条件对修正系数的影响。数学模型的有效性得到了生产试验验证,不仅提高了带钢断面形状仿真系统的计算精度,而且为热轧带钢断面形状的准确预报与控制提供了重要的技术支持,并将其应用到鞍钢1 580 mm七机架热连轧机的生产实践中,取得了良好的使用效果。     

宽薄规格冷硬卷起筋原因分析与改进

介绍了宽薄规格320GD酸轧过程中出现的起筋缺陷的宏观形貌,并分析了热轧原料和冷轧参数对轧制的影响.认为酸轧过程中手动增加正弯辊力、轧机自学习参数设定不合理,导致了窜辊值逐步增大,从而引起带钢中部延伸过大,卷取过程中产生起筋缺陷.通过控制原料凸度和楔形,开发轧制力弯辊力跟随程序,降低冷轧生产过程中各机架弯辊力、4#机架...     

武钢CSP带钢断面局部缺陷产生原因与改进

以武钢条材总厂CSP分厂冷轧用热轧带钢的局部高点缺陷为研究对象,分析了局部高点产生的原因,并提出了采用轧制工艺控制手段的改进措施。改进后,工作辊窜辊范围更广,窜动位置分布曲线更合理,轧辊的磨损量和不均匀磨损明显减小,磨损曲线也趋于平滑;避免了带钢局部过冷现象,消除了带钢断面＂猫耳朵＂,提高了板形控制效果,延缓了局部高点缺陷的产生。     

冷轧用钢隆起缺陷原因分析与控制

针对河钢唐钢1 810线供冷轧用钢(DD11)深加工时容易产生隆起缺陷的问题,通过现场统计,研究隆起的位置、特征,系统分析了热轧、冷轧工艺过程对隆起缺陷的影响。研究认为,冷轧卷产生隆起缺陷主要与原料卷的局部高点有关。从河钢唐钢1 810线实际装备条件出发,通过合理优化编排轧制计划、严格控制轧辊使用吨位及公里数、设置合理的轧辊原始凸度、严格执行轧制带钢冷却制度,避免了热轧带钢形成过大的局部高点,从而使供冷轧用钢隆起缺陷大幅降低,产品质量满足冷轧需求。     

冷轧用料“起筋”缺陷分析与产品改进

针对梅钢热轧带钢在冷轧过程中发生的＂起筋＂缺陷,通过分析其形成原因,以及在生产实践过程中,从产品设计、轧制计划编制、制造等环节采取一系列有效的措施,同时通过控制带钢的横断面形状,最终产品的横向板型得到了优化。改进后热轧带钢在后续冷轧过程中出现＂起筋＂缺陷的比例大为下降,产品实物质量得到有效改进。     

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The general cold rolling mill cannot dynamical display and quantitative control the section properties of strip due to lack of profile gaugemeter. To this problem, through a large number of field trials and theoretical studies, taking the general four-roll cold rolling unit as research object, comprehensive considered the equipment and process characteristics in tandem cold rolling process, based on the strip thickness distribution mechanism model of tandem cold rolling, a whole set of design method for the virtual profile gaugemeter and the feedback control technology for section properties was put forward. It make full use of incoming materia??s section configuration data which come from the profile gaugemeter of hot rolling unit, and the real-time rolling process parameters, such as rolling force, tension, roll bending force and roll tilt amount, which come from the level 1 of tandem cold rolling unit. It can not only dynamical display the section configuration of cold rolled product and dynamic forecast the wedge quantity and plate crown, but also feedback control the section properties of strip. The section quality of cold rolled steel strip product was greatly improved. This technology should be used widely.     

热轧带钢轧辊磨损与起筋现象分析

结合2250mm热轧带钢生产线实际情况,对热轧带钢在冷轧过程中产生的“起筋”现象进行了分析。通过对轧辊磨损数据的统计分析,分析了轧辊磨损与带钢“起筋”的对应关系,针对轧辊的“猫耳”磨损情况,进行了原因分析,并采取了有效措施,对热轧工艺和PCFC模型控制进行了优化改进,取得了很好的效果,改善了产品质量。     

Rectangular Section Control Technology for Silicon Steel Rolling

Rectangular section control technology(RSCT)was introduced to achieve high-precision profile control during silicon steel rolling.The RSCT principle and method were designed,and the whole RSCT control strategy was developed.Specifically,RSCT included roll contour design,rolling technology optimization,and control strategy development,aiming at both hot strip mills(HSMs)and cold strip mills(CSMs).Firstly,through the high-performance variable crown(HVC)work roll optimization design in the upper-stream stands and the limited shifting technology for schedule-free rolling in the downstream stands of HSMs,a hot strip with a stable crown and limited wedge,local spot,and single wave was obtained,which was suitable for cold rolling.Secondly,an approximately rectangular section was obtained by edge varying contact(EVC)work roll contour design,edge-drop setting control,and closed loop control in the upper-stream stands of CSMs.Moreover,complex-mode flatness control was realized by coordinating multiple shape-control methods in the downstream stands of CSMs.In addition,the RSCT approach was applied in several silicon-steel production plants,where an outstanding performance and remarkable economic benefits were observed.     

冷轧钢卷凸包缺陷治理

 针对冷轧带钢卷取过程中出现的凸包缺陷造成产品降级甚至报废问题,在开展重卷试验及断面形状实测基础上,分析了形成冷轧钢卷凸包缺陷的原因。通过合理编排轧制计划、控制精轧机组工作辊热凸度、优化精轧机组工作辊辊型曲线以及解决工作辊轧制润滑和冷却不均等技术措施,有效解决了热轧带钢边部增厚带来的冷轧钢卷凸包缺陷问题,凸包缺陷发生率从6.65％降低到0.33％,取得了显著效果。     

Large concave roll technology for hot rolled silicon steel

It has a strict demand for the transverse thickness difference of silicon steel. To reduce the transverse thickness difference of the cold rolled strip, it must reduce the crown and the wedge of the hot rolled strip. 7-Stands continuously variable crown (CVC) hot rolling mills are conventionally applied to roll silicon steel. However, the CVC rolling mills have many defects to roll silicon steel as a result of the strict demands for the crown and the wedge and the characteristics of the CVC rolling mill. The large concave roll (LCR) technology was puts forward to solve that problem. The LCR technology includes the design of the roll contour and the roll free shifting strategies. The results of simulations and experiments show that the LCR technology can not only ensure the crown target of silicon steel, but also enlarge the coil quantity in a rolling schedule and improve the hot rolled strip edge-drop in the late of rolling schedule. This technology provides guidance for the crown control of the hot rolled silicon steel.     

半无头轧制薄规格带钢的组织性能与板形

 介绍了半无头轧制飞剪的工作状态分析与控制、半无头轧制与辊缝润滑的联合应用等关键设备与技术分析,以及半无头轧制对薄规格及超薄规格产品组织性能和板带出口厚度偏差、板凸度及楔形度等板形质量的影响。结果表明：半无头轧制超长带钢的组织性能具有高的均匀性和稳定性,在保证超长带钢板厚精度和板形质量以及扩大薄带钢规格范围方面,半无头轧制比常规短坯轧制具有明显的优势。同时指出,半无头轧制薄规格产品在“以热代冷”方面应用广泛。     

冷轧工作辊热凸度及其对板形影响

冷轧过程中工作辊的热凸度变化是决定带材板形质量的重要因素,研究分析工作辊的热变形及其对板形的影响对于提高带材质量有着重要的意义.以某厂1 450 mm冷连轧生产线为研究对象,运用大型有限元分析软件ANSYS与LS-DYNA分别建立四机架与五机架的工作辊二维热凸度有限元仿真模型和三维有限元轧制仿真模型,并将2个仿真模型相...