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双语推荐：轧制节奏

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工作辊热凸度与轧制时间、轧制速度、轧制节奏、轧辊冷却水等有着密切的关系,充分了解轧辊热凸度在轧制过程中的变化,不仅可以提高宽带钢热连轧机组热辊形的模型控制及预报精度,而且可以通过及时调整轧制节奏,轧辊冷却水系统的工作情况调整轧辊热凸度,对于板形控制具有重要意义.
@@@@Working roller hot protruding degree and rolling time, rolling speed, rolling rhythm and roller cooling water etc. have close re-lation, know fully roller hot protruding degree the change in rolling course, the model control and forecast precision that can not only raise the broadband steel hot group hot roll forming of rolling mill can also have important meaning through adjusting the working condition adjustment roller hot protruding degree of rolling rhythm and the roller system of cooling water in time and controling for board shape.

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将概率神经网络建模方法与预测思想相结合用于热轧轧制节奏评价,研究并建立了基于PNN神经网络的热轧轧制节奏评价模型。基于涟钢2 250mm热轧厂的实测数据,将建立的PNN网络轧制节奏评价模型用于生产实际,并将结果与BP神经网络进行对比。结果表明,该模型具有便捷、快速、预测精度高、泛化能力强的特点,可代替现有的基于经验公式和经验数据的评价方法,同时为轧制节奏的优化和生产效率的提高提供了参考,具有重要的现实意义。
The probabilistic neural network (PNN) and prediction thought are combined to evaluate mill pacing of hot rolling mill .A model based on PNN is established .To verify the validity of the model and predicted results ,the model is applied to practical production of a hot strip mill and compared with the BP network .The results prove that the model has the advantage of simple structure ,fast calculation ,high prediction accuracy and strong generalization ability ,which is able to substitute for the existing evaluation model based on the empirical formula and empirical da-ta .Meanwhile ,it provides a reference for the optimization of the mill pacing and production efficiency ,so it has an important practical significance .

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以舞钢宽厚板4100mm生产线粗轧机TDC控制为例,通过对存在的问题进行分析,对控制系统不断地优化完善,提高了轧制节奏,保障了轧制成功率和设备的安全。
Take the tdc control of Wugang wide and heavy plate 4100mm production line on rounging mill for an example,Based on the analysis of the existing problems,continuous improvement had been done on the control system,the rolling rhythm had been improved,rolling success rate and equipment safety were protected.

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连铸轴承钢缩孔、碳化物液析和显微孔隙缺陷,主要决定于连铸、加热时的高温扩散和轧制初始的变形量。将连铸过热度控制在20~30℃范围内,使用末端电磁搅拌并确保其在理想的位置,保持加热温度为1 180~1 220℃,连铸坯150mm×150 mm断面的轧制节奏控制在1.0支/min,180 mm×220 mm断面的轧制节奏控制在2.0支/min,控制压缩比≮12,且将初轧7道次的轧制压缩比控制在5.0以上,可减轻或消除缩孔、碳化物液析和显微孔隙。
The shrinking hole, carbide fluid precipitation and micro cavity defects in continuous casting bearing steel process mainly decided the continuous casting process, high temperature diffusion at heating and initial deformation quantity at rolling. Through controlling continuous casting superheat temperature within 20-30 ℃, using electromagnetic stirring and ensuring their end in the ideal position, keeping heating temperature in 1 180-1 220 ℃, controlling rolling rhythm in 1.0 piece/min for 150 × 150 mm continuous casting billet and rolling rhythm in 2.0 piece/min for 180×220 mm continuous casting billet, controlling compression ratio big than 12 and controlling rolling compression ratio in 5.0 above at 7 initial rolling passes, the shrinking hole, carbide fluid precipitation and micro cavity can be relieved or even eliminated.

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热轧精轧机换辊、轧制中断、轧制节奏明显变化等工艺条件下,容易出现较大偏差,导致轧制不稳定、板形有质量缺陷等问题。对首钢某热轧1580生产线工作辊冷却方式进行改造,由辊身均匀冷却方式改为中段集中冷却方式,以便降低工作辊中部温度、减小中部与端部的温差,从而获得较好的工作辊热凸度轮廓曲线,轧制出板形和表面质量良好的带钢产品。
The hot rolling finishing mill changing rolls, interruption of rolling and rolling rhythm changing process conditions have a bigger deviation, lead to instability of rolling and some trip shape quality defects, etc.Now the work roll cooling way of the Shougang 1580mm hot rolling production line would be corrected from a roll uniform cooling way to a middle centralized cooling way.In order to decrease the work roll′s temperature in the middle, and reduce the difference between the middle and end′s temperature.This method had gained a better work roll thermal crown and a contour curve.The good flatness and surface quality of rolled strip steel products of 1580mm hot rolling were achieved in Shougang.

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宽厚板项目ACC水处理控制系统是MULPIC区域的水处理系统。研究了ACC水处理淬火变频自动化控制系统,提出了一个新的控制方案,达到了稳定产品质量和轧制节奏的目的,为提高中厚板厂的效益创造了有利条件。
Heavy plate project''s ACC water treatment control system is mainly responsible for MULPIC regional water treatment system . This paper makes a study on the control system of quenching treatment ,and puts forward a new control method .The good control effect has been obtained ,which can make product quality and rolling rhythm stable ,to improve the benefit of the plate factory .

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武钢1 580mm生产线粗轧R2入口推床在日常生产过程中出现多次油缸底层基础松动、地脚螺栓断裂的情况,造成设备损坏频繁,严重影响正常的生产和产品质量。虽做了几次修复加固,但仍无法彻底解决基础松动螺栓损坏的问题。为了彻底消除隐患,保证正常生产,针对粗轧R2入口推床基础螺栓断裂的问题,从根源入手分析查找原因,分别对油缸基础强度进行校核,液压系统进行综合分析以及电气控制程序进行全面分析优化,最终查找出问题根源,彻底解决了推床基础的问题,有效确保了R2入口推床的使用可靠性,保证了轧制节奏和稳定性,效果十分理想。
Defects such as looseness of foundation of the oil cylinder bottom and fracture of the foundation bolt frequently occur in the pushing lathe located at the R2 entry of the roughing line of 1 580 mm rolling mill in the daily production and thus accidents of the equipment damage take place repeatedly and the normal production and product quality are seriously affected.The problems of foundation looseness and bolt fracture could not be thoroughly solved even though repair and stiffening work ever conducted for a few times.In order to solve the hidden trouble completely and ensure the daily production properly,in light of the problem of the bolt fracture at the R2 entry of the roughing mill the strength of the oil cylinder bottom foundation was calibrated and the hydraulic system was comprehensively analyzed and the electrical control program fully checked and optimized and in the end the origin of the trouble was found out and the problems of foundation of the pushing lathe was thoroughly

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