二十辊轧机振痕振动激励机理与振动特征识别方法研究

发布时间：2018-03-20 04:41

本文选题：二十辊轧机　切入点：振痕振动激励机理　出处：《重庆大学》2015年博士论文　论文类型：学位论文

【摘要】：不锈钢广泛应用于航空航天、通信、汽车工业以及生活的各个方面。随着我国制造业的飞速发展,其对钢铁产品需求量持续增加,同时其制造精度的需要对不锈钢性能和质量的要求越来越高。然而,带钢在轧制过程中,表面会产生明暗交替的振痕,严重影响带钢表面质量,严重时必须进行重新加工或切除,大幅度地增加了企业生产成本,造成巨大的经济损失。因此,深入研究轧机振痕振动特征和激励机理,研究有效识别振痕振动的方法,提出减少振痕产生的控制措施,对提高带钢表面质量,具有重要的理论意义和工程价值。为有效地识别和监测振痕振动,本文针对诱发森吉米尔二十辊轧机振痕振动的激励机理和振痕振动特征进行了研究,基于轧机扭振打滑模型,分析了不同工况时轧辊扭矩变化特征,揭示了轧机扭振激励与振痕振动特征的关系;在分析前后滑区轧制力变化特征及不同轧制参数加载方式对轧机振痕振动特征影响的基础上,究明了轧制参数变化激励与振痕振动特征的关系;建立了轧辊缺陷时变接触刚度模型和轧机有限元模型,解明了轧辊和轴承局部缺陷诱发轧机振痕振动的激励机理和振动特征的问题。基于熵、自适应小波和小波包分解能量分布信号处理方法,提出了振痕振动识别方法,并以Labview软件为平台开发了轧机振痕振动实时在线监测系统。现场试验数据分析结果与理论分析结果的一致性,验证了理论分析的正确性和合理性。论文的主要研究工作如下:①基于轧机传动系统扭振动力学模型,将轧辊之间打滑引入到轧机传动系统扭振模型中,分析了轧机传动系统扭振激励与振痕振动特征的关系;通过对不同轧制速度,不同轧辊之间摩擦系数对轧机扭振特性影响的分析,揭示了轧制速度,摩擦系数对轧辊扭矩的影响特征,并研究了轧机扭振的控制方法。试验结果与仿真结果的一致性,不仅验证了理论分析轧机振痕振动特征的正确性,而且为轧机机扭振诱发轧机振痕振动特征的有效识别提供了理论与实践依据。②针对轧制参数变化激励与轧机振痕振动特征关系的问题,分析了轧制过程中前滑区和后滑区变化对轧制力的影响和轧制力变化规律;基于森吉米尔二十辊轧机垂向横向耦合的动力学模型,研究了轧制力和轧机速度对轧机振痕振动特征的影响,揭示了轧制参数变化激励与轧机振痕振动特征的关系。同时通过试验验证了轧制力变化规律和森吉米尔轧机动力学模型的正确性和有效性,为分析和识别振痕振动提供了理论与实践依据。③针对轧辊和轴承局部缺陷诱发振痕振动的激励机理和振动特征的问题,在考虑轧辊局部缺陷时轧辊之间的边缘接触效应基础上,分析了轧辊之间接触刚度变化过程,揭示了轧辊局部缺陷诱发轧机振痕振动的激励机理和振动特征;建立了轧机三维有限元模型,分析了轴承局部缺陷时轧机振痕振动特征。通过试验数据验证了仿真结果的正确性和模型的有效性,为研究轧机局部缺陷诱发振痕振动的激励机理和振痕振动特征识别方法奠定了基础。④针对轧机振动信号非平稳特征和轧机振痕振动特征识别问题,引入了包络谱信息熵和排列熵方法,分析了振痕振动时轧机加速度信号及扭矩信号的特征;基于自适应小波方法,分析了轧辊表面缺陷尺寸大小对轧机振痕振动特征的影响;提出了小波包分解能量分布的方法,研究了振痕特征频率分布特征。通过试验结果与仿真结果的对比,验证了包络谱信息熵和排列熵,自适应小波方法,以及小波包分解能量分布对振痕识别的有效性。⑤通过对轧机传动系统扭振、轧制参数变化、轧辊表面局部缺陷和轴承局部缺陷诱发轧机振痕振动激励机理与振痕振动特征关系的研究,揭示了不同激励机理时振痕振动特征的表现形式;另外,证实了采用振动加速度信号获得振痕振动特征的有效性,在结合最佳监测测点选择研究的基础上,利用Labview软件开发了一套森吉米尔二十辊轧机振痕振动实时在线监测系统,该系统具有无线与有线发射信号,信号采集与信号分析,以及数据回放等功能。通过对森吉米尔二十辊轧机长期监测,取得了较为满意的报警监测效果,为实时在线监测,及时发现振痕振动提供了切实可行的工具。
[Abstract]:Stainless steel is widely used in aerospace, communication, automobile industry and all aspects of life. With the rapid development of China's manufacturing industry, the demand for steel products continued to increase, while the manufacturing precision of the need for stainless steel performance and quality have become increasingly demanding. However, the strip in the rolling process, the surface will produce light and shade alternate oscillation marks seriously affect the surface quality of the strip, which must be reworked or removed, greatly increased production costs, resulting in huge economic losses. Therefore, in-depth study of rolling mill vibration mark vibration characteristics and incentive mechanism, method of effective identification of oscillation mark vibration, puts forward the control measures to reduce vibration. To produce, to improve the surface quality of the strip, which has important theoretical significance and engineering value. In order to effectively identify and monitor the vibration mark vibration, this paper induced by Jimmy, Sen twenty roller rolling mill vibration Mark vibration mechanism and vibration characteristics of vibration marks were studied. The torsional vibration of rolling mill based on slip model, analyzed the change characteristics of roll torque in different working conditions, reveals the relationship between the vibration excitation and vibration characteristics of the vibration mark; based on the analysis of characteristics of rolling force variation before and after sliding and effects of different loading modes on the rolling parameters the vibration characteristics of the rolling mill vibration mark, the relationship between rolling parameters and study to understand the vibration characteristics of the excitation vibration mark; a roll defect time-varying contact stiffness model and finite element model of rolling mill, including the roll and bearing defects induced by rolling mill vibration mark vibration mechanism and vibration characteristics of the problem. Based on adaptive wavelet entropy. And the energy distribution of the wavelet packet signal processing method, put forward the vibration mark vibration method, and Labview software as a platform to develop the online real-time monitoring system of rolling mill vibration. The vibration mark The consistency of data analysis results of the test results and theoretical analysis, verify the correctness of the theoretical analysis and rationality. The main works of this paper are as follows: the torsional vibration of rolling mill drive system based on the model, will roll into slipping between the torsional vibration model of rolling mill drive system, analyzes the relationship between torsional vibration and vibration excitation mark the vibration characteristics of different rolling speed; through the analysis of the influence of different roll, the coefficient of friction between the torsional vibration characteristics of rolling mill, reveals the influence on the rolling speed, roll torque characteristics of friction coefficient, and the control method of torsional vibration of the rolling mill. The consistency of test results and simulation results verify the correctness of the theory, not only analysis of vibration characteristics of rolling mill vibration mark, and provides the theoretical and practical basis for the effective recognition of rolling mill torsional vibration of rolling mill vibration induced vibration mark characteristics. The rolling parameters The relationship between excitation and vibration characteristics of rolling mill vibration mark problem, analysis of the rolling process before the slide change zone and backward slip zone influence on rolling force and rolling force; Sendzimir twenty roller mill vertical dynamics model based on transverse coupling, the rolling force and rolling speed influence on the vibration characteristics of rolling mill vibration mark and reveals the relationship between rolling parameters change excitation and vibration characteristics of rolling mill vibration mark. At the same time to verify the correctness and effectiveness of the rolling force variation and dynamics model of Sendzimir mill through experiment, provides the theoretical and practical basis for the analysis and identification of oscillation mark. The vibration of roller and bearing defects induced by local vibration vibration mark mechanism and vibration characteristics of the problem, considering the effect of roll edge contact based local defects between the rolls and rolls are analyzed between contact stiffness change process, revealing The roller mill vibration mark induced local defects of vibration mechanism and vibration characteristics of rolling mill; established a three-dimensional finite element model, analyzes the local defects of rolling mill vibration mark bearing vibration characteristics. Through the test data to verify the correctness and validity of the simulation results, which laid the foundation for the research of local defects induced by vibration mark mill vibration mechanism and vibration characteristics of vibration mark recognition method. According to the non-stationary characteristics and vibration characteristics of rolling mill vibration mark recognition of rolling mill vibration signal, introduces the envelope spectrum entropy and permutation entropy method, analyzes the characteristics of mill acceleration signal and the torque signal when oscillation vibration; adaptive wavelet method based on the analysis of the impact of roller surface defect size on the vibration characteristics of rolling mill vibration mark; put forward the wavelet packet decomposition energy distribution method, studied the vibration mark characteristic frequency distribution. Through the test Comparison of test results and simulation results, verify the envelope spectrum entropy and permutation entropy, adaptive wavelet method, and wavelet packet decomposition energy distribution on the effectiveness of the identification marks. Through the vibration of drive system torsional vibration of rolling mill, rolling parameters, study the local defects of roll surface and bearing vibration mechanism and vibration mark relationship mark the vibration characteristics of the local defect induced by vibration mill, reveals the different forms of incentive mechanism of oscillation mark of vibration characteristics; in addition, confirms the validity of the obtained oscillation vibration characteristics using vibration acceleration signal, on the basis of the optimum monitoring point selection research, developed a set of real-time online monitoring system of twenty roll of Sendzimir mill rolling mill vibration mark vibration using Labview software, the system is wired and wireless transmission signal, signal acquisition and signal analysis, and data playback. On the two by gelmir Sen The long-term monitoring of ten high rolling mill has obtained a satisfactory alarm monitoring effect. It provides a practical tool for real-time on-line monitoring and timely discovery of vibration trace vibration.

【学位授予单位】：重庆大学
【学位级别】：博士
【学位授予年份】：2015
【分类号】：TG333

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