發(fā)布時間：2018-05-23 23:17

  本文選題：板形應力 + 檢測��； 參考：《北京科技大學》2016年博士論文

【摘要】：高強/超高強度熱軋和冷軋帶鋼產(chǎn)品的“暗”板形也即板形應力問題,是當前制約該類產(chǎn)品的規(guī)格品種發(fā)展和板形質(zhì)量提高的突出技術問題。實現(xiàn)對無張力鋼板和有張力但不平直帶鋼的“暗”板形的在線連續(xù)檢測,是解決該板形問題的基礎條件,但也是一個始終未能解決的技術難題。本文借鑒移植近年來針對鐵磁材料內(nèi)應力的磁性檢測方法,提出板帶鋼板形應力的磁彈效應透射式檢測新方法和技術方案,設計搭建原理樣機實驗系統(tǒng),驗證研究其技術可行性,并開展關鍵技術的理論與實驗研究,研制開發(fā)工業(yè)應用級正樣五測量點式板形應力檢測樣機系統(tǒng),進一步研究和驗證新方法的可行性。本文的主要研究工作及成果如下：(1)針對高強及超高強度鋼板帶的“暗”板形檢測問題,提出透射式鋼板內(nèi)應力檢測方法和技術方案,并設計搭建檢測原理驗證實驗系統(tǒng),比較研究了單側式與透射式兩種檢測方案,驗證了磁彈效應透射式新方法的技術可行性,確定了磁性原理板形應力檢測技術方案。(2)針對基于磁彈效應的透射式帶鋼應力檢測方法,利用ANSYS有限元軟件分析了內(nèi)應力透射式檢測過程中鋼板磁場的分布與演變；運用磁路理論和磁致各向異性理論建立了考慮磁氣隙影響的磁力學數(shù)值模型,得到了檢測過程中系統(tǒng)輸出電壓與鋼板外加單向應力的關系式,通過原理驗證實驗系統(tǒng)對關系式中主要參數(shù)進行的規(guī)律性試驗,驗證了所建立數(shù)學模型的正確性。(3)提出了基于磁彈性效應的相位差信號應力表征方法,研究改進了基于材料磁致各向異性特性的電壓幅值表征方法,開發(fā)設計出可用以實際測試的基于嵌入式ARM+FPGA的雙參數(shù)透射式鋼板板形應力檢測儀,實現(xiàn)了電壓幅值和相位差值兩種不同類型信號對鋼板板形應力的表征；使用開發(fā)設計的檢測儀和磁彈性傳感器對以Q235和無取向硅鋼的取樣帶鋼進行測試實驗,獲得磁通量與主應力之間基本穩(wěn)定的定量關系及影響規(guī)律,驗證兩種信號與試樣板形應力之間的敏感相關性,深入研究傳感器參數(shù)對應力測量結果的影響規(guī)律。(4)開展磁原理板形應力檢測的若干關鍵技術研究。研究采用正弦波低頻諧振技術對電路勵磁供電,降低了磁彈性應力傳感器功耗,提高了信號抗干擾能力；對傳感器非接觸測量過程中提離影響展開了討論,提出了解決提離值變化引起的系統(tǒng)穩(wěn)定性波動的方法；研究了溫度對系統(tǒng)檢測的影響,采用合理的溫度補償方法實現(xiàn)了傳感器溫度漂移的補償；為實現(xiàn)多通道傳感器的同時勵磁檢測,系統(tǒng)地研究了弱磁場檢測傳感器的電磁屏蔽處理技術。(5)為了實現(xiàn)對大尺寸帶鋼在承受工藝張力和高速運行狀態(tài)下的高速動態(tài)檢測,研制了帶鋼快速高精度板形應力檢測樣機,并將所設計的傳感器及透射式檢測系統(tǒng)應用到該檢測樣機,實現(xiàn)了對接近于生產(chǎn)工況條件下帶鋼的內(nèi)應力檢測,為進一步實現(xiàn)磁彈性透射式板形應力檢測系統(tǒng)的冷軋產(chǎn)線生產(chǎn)現(xiàn)場應用奠定了基礎。
[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.
【學位授予單位】：北京科技大學
【學位級別】：博士
【學位授予年份】：2016
【分類號】：TG115

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本文編號：1926778