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薄规格花纹板试轧与工艺改进 总被引:1,自引:0,他引:1
为提高薄规格花纹板的生产能力与产品质量,扩大市场份额,对2.3 mm厚的花纹板进行了试轧.根据试轧过程中出现的问题,如轧制的不稳定、带钢出末机架后易跑偏、在热输出辊道上易上飘、板形出现严重边浪与中浪,考虑到花纹的纹高,平整生产时又不能进行平整,对精轧轧辊辊型匹配、末机架上下辊的辊压及层流冷却的工艺参数进行了调整与优化,从而提高了产量,稳定了质量,降低了生产成本,有效满足了用户的需求. 相似文献
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3.2 轧辊性能要求 粗轧机架工作辊3.2.1 由于粗轧机架轧辊承受着较高的轧制力和扭矩要求轧辊具有较高的机械强度同时轧材对其传,,热率高要求其具有良好的耐热疲劳性。粗轧段轧,制相对速度较低,对工作辊耐磨性要求不高,但粗轧后段即~架工作辊对耐磨性相对较高。R34 精轧段3.2.2 精轧段轧制条件变化较大,要求精轧前段和精轧后段工作辊具有不同性能。精轧前段承受较高 的轧制力和较后段高的轧材传热率,同时轧制相对速度亦较高,因而要求精轧前段工作辊具有较高的强度、耐磨性、抗热裂性。精轧后段轧制速度较高,轧辊承受着较高的单位面… 相似文献
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超薄热轧花纹板可实现“以热带冷”,特别是普通材质超薄花纹板,力学性能和机械性能要求较低,性价比高,应用领域广泛。超薄热轧花纹板的生产瓶颈体现在生产过程,因其在精轧工序变形量大、轧制力高、轧制速度快,易发生堆卡钢、甩尾事故。1580热轧线使用Q235B铸坯生产厚度1.2~1.8 mm的花纹板,初期使用常规轧制工艺,精轧机甩尾频繁,热轧线堆卡钢率超过5%,通过控制加热温度及两炉温差,制定合理的粗轧除鳞道次控制中间坯温度,提升卷箱速度改善中间坯头尾温差,对精轧轧辊、轧制速度、轧机负荷和弯窜辊的轧制参数进行优化,以及冷却卷取等工序的工艺进行优化,结合合理的轧制排程及轧制节奏控制,解决了轧制超薄极限规格花纹板堆卡钢率高的问题,实现了花纹板极限规格的小批量稳定生产。 相似文献
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针对轧制电工钢时,精轧下游机架CVC工作辊不均匀磨损产生的各种质量问题,通过在精轧下游机架采用常规工作辊(平辊)辊形,结合L2周期性的往复窜辊策略,充分发挥精轧工作辊的长行程窜辊功能,解决精轧下游机架工作辊不均匀磨损导致的局部高点、楔形等异常断面轮廓形状等板形问题,进一步延长轧制公里数。 相似文献
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针对某四机架六辊高精度控制辊型(HC)冷轧机组大压下率轧制时弯辊力时常饱和的问题,可将末机架工作辊辊型优化为六次多项式曲线,赋予工作辊正凸度,并适当降低承载辊缝的二次凸度和四次凸度,这样既可以增强轧机板形控制能力,也可以实现对中间辊磨损凸度的在线补偿,降低工作辊弯辊力。工作辊最大凸度优化值应根据轧制品种、轧制厚度和宽度规格、中间辊辊期长短进行综合考量。轧制试验结果表明,在1个中间辊辊期的初始阶段采用平辊型工作辊,中后期阶段采用凸辊型工作辊,可实现中间辊磨损凸度和工作辊初始凸度的良好匹配;连续轧制时弯辊力始终处于良好的调控区间,且对轧制品种和宽规格的适应性明显增强,板形综合值小于8 IU的比例可提升10%以上。 相似文献
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分析薄规格钢板镰刀弯成因,最终确定3个主要因素。调整工作辊轴承座滑板间隙,提高了辊系稳定性;改造工作辊挡水器,减少了精轧过程钢板表面残余积水;优化16 mm及以下规格品种轧制工艺。通过以上措施实施,有效抑制了镰刀弯问题,比例降低为10.78%,滑板更换每年减少为25块。 相似文献
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莱钢1500 mm热轧宽带生产线在生产部分品种规格时,出现塌卷缺陷,造成下道工序及客户使用时钢卷开平困难。结合现场工艺设备特点,根据钢卷缺陷特征与分布规律,分析缺陷产生原因。通过优化卷取设定张力、改善带钢断面形状和层冷温度、增加花纹板卷径补偿等措施,塌卷缺陷得到有效控制,卷形质量明显改善。 相似文献
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HU Yu GONG Dian-yao JIANG Zheng-yi XU Jian-zhong ZHANG Dian-hua LIU Xiang-hua 《钢铁研究学报(英文版)》2009,16(5)
Based on the influence coefficient method, the effect of entry strip crown on the shape of hot rolled strip was analyzed using the software of roll elastic deformation simulation. According to the practical condition of a domestic hot roiled strip plant, the unit strip crown change from the first stand to the last stand was calculated when the entry crown of hot strip varies. The calculated result shows that the entry strip crown does not significantly affect the target strip crown at the exit of the last finishing stand in respect to a fixed strip shape control reference (such as bending force). The calculation was analyzed, and the research is helpful in modeling strip shape setup and shape control. 相似文献
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It is a complicated problem for cold-rolled strip to improve asymmetric strip shape in strip production. A roll system and strip coupled model of six-high cold rolling mill was established with finite element method to estimate the effect of intermediate roll shifting, tilting, symmetric and asymmetric bending technologies on strip profile. To reduce asymmetric defects of strip shape as much as possible, some control strategies were proposed, including tilting and asymmetric bending of intermediate roll and work roll. The combinations of these three control strategies can effectively eliminate asymmetric strip shape defects. Finally, the closed-loop control model of asymmetric flatness at the last stand was given, and the flatness control system with the function of asymmetric strip shape control was also designed for cold tandem mill. 相似文献
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HU Yu GONG Dian-yao 《钢铁研究学报(英文版)》2009,16(5):32-34
Based on influence coefficient method, using the software of roll elastic deformation simulation, the effect of entry crown on hot rolled strip shape was researched and analyzed. According to the real condition of certain domestic hot rolled strip factory, the unit crown change from the first stand to the last was calculated when entry crown of hot strip alters. The calculation result shows that the entry crown effect not obviously on the target strip crown at the exit of last stand with the strip shape control reference such as bending force keeping fixed. The reason of calculation was analyzed, the research work refers theory support to strip shape setup modeling and shape control. 相似文献