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针对单机架四辊可逆窄带轧机因工作辊辊径绝对值较小而引起的工作辊水平位移不可忽略、工作辊热凸度偏大、板形构成更为复杂、板形控制难度增大且对轧制规程依赖性更强的问题,充分考虑到单机架四辊可逆窄带轧机的设备与工艺特点,在建立了单机架四辊可逆窄带轧机轧制规程对板形影响模型、分析了特定道次规程参数对板形影响的基础上,以轧制道次相对负荷最均匀为目标,同时兼顾板形控制、轧制稳定性以及表面缺陷防治等因素的影响,提出了一套适合于单机架四辊可逆窄带轧机兼顾板形控制的轧制规程综合优化设定方法,并将相关技术应用到某公司450mm四辊轧机的生产实践,取得了良好的使用效果,机组板形封闭率下降了45.5%。 相似文献
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针对冷连轧机高强钢轧制时出现的轧制力计算模型不准、轧制力超限停机问题,建立了基于Hill公式的显函数轧制力计算模型,分析了高强钢变形抗力、压下分配、辊系配置及轧制润滑等对轧制力的影响。实际生产工况及轧制力数据分析表明,对减小轧制力作用最明显的是轧制规范(压下分配及张力制度)优化,其次是轧制润滑工艺参数改进、降低热卷厚度及减小工作辊辊径等,对轧制力减小的作用基本相同。通过相关工艺参数的优化,解决了高强钢轧制力超限问题。 相似文献
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陈兴国 《金属材料与冶金工程》2000,(3):10-13,16
为了合理、均衡使用350mm三机架冷连轧机组的装备能力,实现大压下的轧制功能,采用“压下量逼近法”,通过计算机模拟计算制定了该机组最优化压下规程,同时还研究了在连轧机上把3#轧机改成单辊传动的异径辊轧机,对于加大机组总的压下能力的影响。结果表明,采用单辊传动异径辊技术,提高了机组的潜在能力,保证了高产,优质和低耗。 相似文献
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为提升国内某1 340 mm HC冷连轧机组的带钢板形质量和生产效率,建立了以带钢板形良好、电机功率平衡和预防打滑为优化目标的四机架HC冷连轧机负荷分配多目标优化模型,采用非支配排序遗传算法(NSGA-Ⅱ)获得Pareto最优解集。按轧制状态将工作辊辊期划分为4个阶段,基于各阶段工作辊的热凸度、粗糙度以及控轧需求,合理确定3个优化目标的权重系数,解决目标函数间的冲突关系,从而获得能适应辊期动态变化的轧制规程。仿真表明:优化后的轧制规程有助于改善板形质量、提高生产效率并减小打滑概率。 相似文献
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硅钢厂自1978年引进日本的森吉米尔轧机以来,一直采用日本专利介绍的生产工艺。低牌号无取向硅钢(主要指W_(201A)、W_(181A))采用与高牌号无取向硅钢相同的生产工艺,但由于低牌号硅钢含硅量低,变形抗力小,轧制时不但负荷低,而且轧出的钢板板形也差。为此,我们研究了改变轧制规程、增加轧制压下量、减少轧制道次的可行性,以提高轧机作业率和产品质量。一、试验参数的确定工艺的改进,首先应考虑钢的变形抗力和轧制负荷,才能确认减少轧制道次后的压下规程是否在设备允许的载荷之内。 1.压下制度的选择为了保证产品的板形良好并充分发挥设备能力,将轧制负荷均匀地分配到各道次, 相似文献
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为了解决采用圆弧模型计算超高强钢冷轧过程轧制变形区轧辊压扁曲线误差较大的问题,充分考虑到超高强钢的轧制特点,通过分析不同压扁半径下轧辊压扁曲线的变化规律,构造出新型轧辊压扁曲线函数模型,给出了该函数中轧制变形区接触弧长特性参数与轧辊压扁曲线特性参数的求解方法。基于此,根据弹塑性理论中的变形与应力关系,推导了入口弹性变形区、塑性压下变形区以及出口弹性变形区单位轧制压力分布计算过程,建立了超高强钢冷轧过程总轧制力计算模型。并将其推广应用到某钢厂2030冷连轧机组,验证了该模型的计算准确度。结果表明,超高强钢冷轧过程轧辊压扁曲线用二次函数表示,更能准确反映轧辊压扁状态,其计算结果与实际值具有较高的吻合度。同时,为冷连轧机组生产超高强钢产品极限轧制能力的评估与轧制规程的制定提供了理论依据。 相似文献
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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. 相似文献
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BAI Zhen- hua LI Bo- yang ZHAO Wei- quan DU Jiang- cheng QIAN Cheng YU Hui- zhong 《钢铁研究学报》2018,30(6):453-460
The small four- high rolling mill of narrow strip has such structural features of small absolute value of working roll diameter, which causes problems like non- negligible horizontal displacement of the work rolls, larger thermal crown of the work roll, and more complicated shape control of the plate. The shape was more dependent on rolling schedule. The equipment and process characteristics of reversible four- high mill of narrow strip were fully considered. The influence model of rolling schedule of small four- high rolling mill on shape was established. The influence of specific path rolling schedule parameter on the shape was quantitatively analyzed. The targets were that the rolling pass was minimum and the relative load was the most uniform. Meanwhile, the influences of such factors as shape control, rolling stability and prevention of surface defects were also considered. A set of comprehensive optimization method for rolling schedule was put forward, which was suitable for small four high mill and taking account of shape control. Relevant technology was applied to the production practice of 450 small four high rolling mill in a company. Good results were achieved after the application in the field. The shape closure rate of the unit decreases by 45. 5%. 相似文献
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Based on rolling feature of continuous tandem cold rolling mill, such as multi-variable, strong coupling, non-linear, analyze and set the equal relative load, preventing slippage and profile well as the multi-objective optimization goal, BP neural network with self-learning function is adopted to replace traditional rolling force models and then Levenberg-Marquardt algorithm is adopted to predict the rolling force. Then use multi-objective fuzzy theory to solve the problem of multi-objective optimization of tandem cold rolling schedule. With the example of 1370mm tandem cold rolling, the rolling schedule of the common rolling, the single-object optimization design and the multi-objective fuzzy optimization design are compared with each other, optimization result shows the proposed optimization method decreases the value of three objective functions simultaneous. The performance of the optimal rolling schedule is satisfying and it is promising. 相似文献
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针对某冷连轧机在高强钢生产中出现的板形问题,以提高机组对高强钢产品的板形控制能力为目标,对中间辊和支持辊辊形进行了优化设计,并对第五机架精细冷却乳化液使用工艺进行了优化研究。新的高强钢板形控制工艺技术在生产中使用稳定,从根本上提高了轧机板形控制能力,0~3 IU的板形控制精度所占比例由83.71%提高到90.86%,轧辊磨损得到明显改善,应用效果显著。 相似文献
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