带钢板形应力非接触检测方法研究

发布时间：2018-05-23 23:17

本文选题：板形应力 + 检测　；参考：《北京科技大学》2016年博士论文

【摘要】：高强/超高强度热轧和冷轧带钢产品的“暗”板形也即板形应力问题,是当前制约该类产品的规格品种发展和板形质量提高的突出技术问题。实现对无张力钢板和有张力但不平直带钢的“暗”板形的在线连续检测,是解决该板形问题的基础条件,但也是一个始终未能解决的技术难题。本文借鉴移植近年来针对铁磁材料内应力的磁性检测方法,提出板带钢板形应力的磁弹效应透射式检测新方法和技术方案,设计搭建原理样机实验系统,验证研究其技术可行性,并开展关键技术的理论与实验研究,研制开发工业应用级正样五测量点式板形应力检测样机系统,进一步研究和验证新方法的可行性。本文的主要研究工作及成果如下：(1)针对高强及超高强度钢板带的“暗”板形检测问题,提出透射式钢板内应力检测方法和技术方案,并设计搭建检测原理验证实验系统,比较研究了单侧式与透射式两种检测方案,验证了磁弹效应透射式新方法的技术可行性,确定了磁性原理板形应力检测技术方案。(2)针对基于磁弹效应的透射式带钢应力检测方法,利用ANSYS有限元软件分析了内应力透射式检测过程中钢板磁场的分布与演变；运用磁路理论和磁致各向异性理论建立了考虑磁气隙影响的磁力学数值模型,得到了检测过程中系统输出电压与钢板外加单向应力的关系式,通过原理验证实验系统对关系式中主要参数进行的规律性试验,验证了所建立数学模型的正确性。(3)提出了基于磁弹性效应的相位差信号应力表征方法,研究改进了基于材料磁致各向异性特性的电压幅值表征方法,开发设计出可用以实际测试的基于嵌入式ARM+FPGA的双参数透射式钢板板形应力检测仪,实现了电压幅值和相位差值两种不同类型信号对钢板板形应力的表征；使用开发设计的检测仪和磁弹性传感器对以Q235和无取向硅钢的取样带钢进行测试实验,获得磁通量与主应力之间基本稳定的定量关系及影响规律,验证两种信号与试样板形应力之间的敏感相关性,深入研究传感器参数对应力测量结果的影响规律。(4)开展磁原理板形应力检测的若干关键技术研究。研究采用正弦波低频谐振技术对电路励磁供电,降低了磁弹性应力传感器功耗,提高了信号抗干扰能力；对传感器非接触测量过程中提离影响展开了讨论,提出了解决提离值变化引起的系统稳定性波动的方法；研究了温度对系统检测的影响,采用合理的温度补偿方法实现了传感器温度漂移的补偿；为实现多通道传感器的同时励磁检测,系统地研究了弱磁场检测传感器的电磁屏蔽处理技术。(5)为了实现对大尺寸带钢在承受工艺张力和高速运行状态下的高速动态检测,研制了带钢快速高精度板形应力检测样机,并将所设计的传感器及透射式检测系统应用到该检测样机,实现了对接近于生产工况条件下带钢的内应力检测,为进一步实现磁弹性透射式板形应力检测系统的冷轧产线生产现场应用奠定了基础。
[Abstract]:The "dark" plate shape of high strength / super high strength hot rolling and cold rolled strip is the problem of plate stress, which is a prominent technical problem that restricts the development of specifications and shape quality of this kind of products. The on-line continuous detection of the "dark" shape of the tension free steel plate and the tension but not straight strip is to solve the problem of the shape. The basic conditions, but also a technical problem that has never been solved. This paper draws on the magnetic testing method of the internal stress of ferromagnetic material in recent years, and puts forward a new method and technical scheme for magnetic elastic effect transmission detection of plate stress of plate and plate, and designs a prototype experiment system to verify its technical feasibility and open up. The theoretical and experimental research of the key technology is developed and the five measuring point type plate stress testing prototype system is developed to further study and verify the feasibility of the new method. The main research work and results of this paper are as follows: (1) the transmission type steel is proposed for the "dark" plate detection problem of high strength and ultrahigh strength steel strip. The testing method and technical scheme of internal stress are designed and built, and the test system is designed and built. Two detection schemes of unilateral and transmission are compared and studied. The technical feasibility of the new transmission method of the magnetoelastic effect is verified. The magnetic principle plate stress detection technique is determined. (2) the transmission type strip based on the magnetoelastic effect should be used. The force detection method is used to analyze the distribution and evolution of the magnetic field in the process of internal stress transmission detection by using the ANSYS finite element software. The magnetic field theory and the magnetic anisotropy theory are used to establish the magnetomechanical numerical model with the influence of the magnetic gap, and the relationship between the output voltage of the system and the unidirectional stress of the steel plate is obtained. The principle verifies the regularity of the experimental system on the main parameters in the relationship and verifies the correctness of the established mathematical model. (3) the phase difference signal stress characterization method based on the magnetoelastic effect is proposed and the voltage amplitude characterization method based on the magnetic anisotropy of the material is improved. A double parameter transmission plate type stress detector based on embedded ARM+FPGA is tested and the stress of two different types of signals with voltage amplitude and phase difference are characterized. The test experiments on the sample strip with Q235 and non oriented silicon steel are obtained by using the developed designed detector and magnetoelastic sensor. The quantitative relationship between the magnetic flux and the main stress and the influence law of the basic stability, verify the sensitive correlation between the two kinds of signals and the plate stress of the sample, and deeply study the influence law of the sensor parameters corresponding to the force measurement results. (4) research on some key technology of the plate stress detection of the magnetic principle. The operation of power supply to circuit excitation reduces the power consumption of magnetoelastic stress sensor and improves the anti-interference ability of the signal, discusses the effect of lift off in the non contact measurement of the sensor, puts forward a method to solve the stability fluctuation of the system caused by the change of the lift off value, and studies the influence of temperature on the system detection, and uses a reasonable temperature supplement. Compensation method is used to compensate the temperature drift of the sensor. In order to realize the simultaneous excitation detection of multi channel sensors, the electromagnetic shielding processing technology of the weak magnetic field detection sensor is systematically studied. (5) in order to realize the high speed dynamic detection of the large size strip under the process tension and high speed running state, the rapid and high precision of the strip is developed. The prototype of the degree plate stress detection is used, and the designed sensor and transmission detection system are applied to the prototype. The internal stress detection of the strip near the production condition is realized, which lays a foundation for the further realization of the field production field application of the magnetoelastic transmission type stress detection system.
【学位授予单位】：北京科技大学
【学位级别】：博士
【学位授予年份】：2016
【分类号】：TG115

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