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从腐蚀与保护学上分析了热连轧精轧工作辊的磨损机理,根据腐蚀的相关因素对传统的热连轧轧制单元设计进行了改进,有效地解决了热轧带钢三次氧化铁皮质量缺陷问题,并在保证带钢表面质量的前提下增加了轧制单元的轧制总长度,降低了轧辊消耗。 相似文献
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CVC工作辊辊形自发明以来在全球150多条热连轧生产线上得到应用,以控制带钢的板形。实际应用中,与CVC工作辊配对使用的支承辊无论采用平辊还是CVC辊形均存在非均匀磨损甚至轧辊剥落失效的问题,主要原因是CVC支承辊辊形和平支承辊与CVC工作辊配置时存在接触压力集中。为了解决此问题,设计并应用了一种均压支承辊辊形与CVC工作辊配置使用。此辊形是变接触支承辊辊形(VCR)与CVC支承辊辊形的组合,具有变接触辊形的优点,同时又能更好地与CVC工作辊配置使用。均压支承辊辊形应用后,改善了CVC工作辊与支承辊辊间接触状态,解决了轧辊剥落问题,并改善了带钢凸度质量。 相似文献
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《钢铁冶炼》2013,40(8):633-640
AbstractDuring the first year of production in the 2250 mm hot strip mill of Qian'an Iron and Steel Company of Shougang Steel Corporation, roll spalling and broken rolls were frequent occurrences, especially on the second stand of roughing mill (R2), and resulted in enormous economic losses. In addition, improvements to strip shape were required. One of the factors resulting in strip shape defects after finish rolling is that the transfer bar usually had an unsound profile such as a large wedge, camber or negative crown after roughing rolling. To solve these problems, a variable contact back-up roll contour curve with six order of polynomials and negative crown contour was designed and applied to the back-up roll and work roll of roughing mill stands R1 and R2 instead of a conventional flat roll contour. After the application, roll spalling, crown and wedge quality of the transfer bar and strip quality all improved. 相似文献
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边部线状缺陷是热轧带钢易发缺陷,不仅严重影响成材率,还可能对热轧下游工序生产过程造成影响。边部线状缺陷的影响因素复杂多变,建立精确的机理预报模型十分困难。为此,首先分析边部线状缺陷的主要影响因素;然后以智能方法为基础,分别建立了基于逻辑回归与神经网络的边部线状缺陷智能预报模型,并分析了2个模型的精度与泛化能力;最后,以神经网络智能预报模型为基础,对加热工艺参数进行优化,使缺陷发生率与封闭率均大幅降低。研究结果对提高热轧带钢表面质量具有实践意义,可推广应用于同类轧线。 相似文献
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介绍了济钢1700 mm热连轧厂热轧带钢板型缺陷产生的原因。济钢热轧厂投用板型自动控制系统后,带钢的板型得到显著改善,有利于产品的尺寸控制及提高外观质量,为生产更高级别的产品打下基础。 相似文献
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针对唐钢冷连轧机轧制1 700热轧线供料板形良好而轧制1 580热轧线供料出现双边浪缺陷的问题,对比分析了两种热轧原料的板形和组织,发现1 580原料边部和中心组织不均匀性过大,在其他轧制条件相同且采用同一目标板形曲线的情况下,在轧制过程中带钢在宽度方向上产生的变形热不同,引起带钢沿横向不均匀的热延伸,进而导致双边浪缺陷;结合1 580线供料的特性,根据板形目标曲线系数的设定原理,制定了一系列目标板形曲线,消除了双边浪缺陷,很好地满足了镀锌工艺对板形的要求,显著提高了产品的板形质量。 相似文献
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热轧板带无头轧制技术 总被引:5,自引:1,他引:4
分析介绍了热带无头轧制技术在板带高效、高精度轧制中的作用,国外在常规热连轧线上实现无头轧制的技术特点、应用效果及进展,以及最新的ESP技术的特点和最新发展。同时,也简要介绍了国内对热带无头轧制技术的关注以及初步研究探索情况。实践证明,热带无头轧制在减量化板带生产,即低成本大批量生产薄和超薄规格板带,提高板带的组织性能稳定性、均匀性、成材率及板厚板形精度、实现部分“以热代冷”等方面效果显著,是推动节能减排和现代板带轧制技术发展的方向,具有重要的研究开发价值和应用前景。 相似文献
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《钢铁研究学报(英文版)》2016,(6):547-552
The cooling process following hot rolling has a significant effect on the shape quality of a hot-rolled strip.The temperature and stress fields in the cooling process for a 14 mm thick strip with yield strength of 500 MPa grade were analyzed by the finite element method and actual test data,and the relationship between residual stress and shape defects was described.Subsequently,the small-crown rolling process and the coil slow cooling process were investigated.The results indicate that these processes improved the shape quality of the final product significantly. 相似文献
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《钢铁冶炼》2013,40(7):548-554
AbstractHot and cold rolled strip samples with surface defects such as black pockmark, sliver and central cracking were collected from a compact strip production line followed by cold rolling. Microstructures and chemical compositions of the strip with defects were studied by scanning electronic microscopy and energy dispersive X-ray spectroscopy. Four typical types of defects on strip including surface spherical mould powder entrapment, centre spherical mould powder entrapment, surface linear mould powder entrapment and centre linear mould powder entrapment were studied by hot and cold rolling experiment in laboratory. It was observed that spherical mould powder entrapment was transformed into the surface black pockmark after the hot rolling and cold rolling process. Centre spherical mould powder entrapment led to central fracture in the hot and cold rolling process. Surface linear mould powder entrapment resulted in sliver and centre linear mould powder entrapment led to severe sliver. 相似文献
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V. M. Salganik D. O. Pustovoitov S. V. Denisov A. V. Fomichev V. L. Kornilov S. I. Platov 《Steel in Translation》2012,42(10):738-740
Improvement of relatively thick strip (16–20 mm) produced on the OAO MMK 2000 broad-strip mill is considered. Artificial neural networks may be used to optimize broad-strip hot rolling, so as to obtain the required mechanical properties of the strip produced. High surface quality of the strip may be ensured on the basis of finite-element models for predicting the behavior of surface defects on rolling and hence identifying effective rolling conditions. 相似文献
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铝合金热轧过程中因摩擦产生大量铝粉,如果过多的铝粉不加于控制,很容易在铝板带表面形成黑条缺陷,影响最终产品表面质量,导致批量不良。本文主要分析因热轧铝粉过多导致的黑条缺陷,分析其产生的根本原因,并从乳液过滤、轧机清洁和工艺控制等方面入手,并给出行之有效的解决方案。 相似文献
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对取向硅钢冷轧过程出现的断带缺陷进行了跟踪,明确了从起皮到形成孔洞,再到断带的演变过程,采用扫描电镜对翘皮缺陷进行研究,结果表明:翘皮缺陷中主要元素是Fe、Si、Al,与基体一致,另外还有微量的Ca、Mg、K、Na等元素。冷轧起皮、断带主要是由于热轧边裂缺陷遗传而成。热轧过程部分边部掉肉飞溅至热轧板表面被压入,在冷轧过程由于伸长率与基体不一致而起皮剥落。通过降低铸坯加热温度、缩短高温段在炉时间、优化轧制模型,有效抑制了热轧板边裂的产生,从而解决了冷轧断带问题。 相似文献
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在带钢热连轧机组上开展TA10钛合金带的轧制工艺优化研究,结合带钢轧制工艺设计,提出多组不同钛带轧制工艺规程,然后直接在带钢热连轧机上进行TA10钛合金带的热连轧生产试验。通过比较研究不同轧制工艺所生产产品的微观组织、力学性能及其他质量状态,揭示了不同热连轧工艺与组织性能的相关性,掌握TA10钛合金带热连轧变形特点,优选确定了TA10钛合金带的轧制工艺及参数,并投入生产应用后使该带钢热连轧机稳定生产出了基本满足相关技术标准要求的TA10钛合金带产品。 相似文献
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边损是不锈钢热轧黑卷生产过程中常见的质量缺陷,通过统计、分析边损产生原因,制订了相应的技术措施,优化铁索体不锈钢加热温度、在炉时间和出炉温度等热轧工艺制度,以降低边损质量缺陷数量和比例。结果表明:边损缺陷数量由2006年的1909.630t减少至113.431t,减少1796.199t,边损缺陷比例由1.469下降至0.050%,下降幅度为96.58%。 相似文献