本文選題：鋼板帶 + 板形　； 參考：《北京科技大學》2015年博士論文

【摘要】：隨著航天航空、汽車、家電等高端制造業(yè)對板帶產品質量要求日趨嚴格,板形成為影響產品競爭力和市場占有率的主要質量指標,板形生成理論與控制技術成為國內外研究前沿和熱點。本文依托國家自然科學基金項目“超高強度鋼板平整與矯直加工過程殘余應力控制的基礎研究”,采用解析、仿真和實驗相結合的方法,對鋼板帶板形瓢曲和翹曲的生成機理與變形行為進行研究,以期發(fā)展和完善板形理論與技術。本文的主要內容及研究成果如下。 (1)針對板形平直性缺陷,依據(jù)其產生的力學機理,提出新的概括和分類,抽象建立板形瓢曲和翹曲的生成過程力學模型,推導建立可考慮鋼板各向異性的通用解析計算模型及求解算法和初應變與外載荷作用下的樣條有限元法計算模型及求解算法,編制MATLAB平臺計算軟件。經計算對比,兩種方法的計算結果相互吻合并且都能滿足板形研究需要。 (2)針對鋼板帶塑性壓力加工初應變導致的板形平直性缺陷,應用所建立板形瓢曲和翹曲計算模型,深入研究了板形缺陷生成領域的三個重要問題。 ①研究軋后鋼板各向異性及其對于板形平直性缺陷的影響,獲得了瓢曲變形的屈曲臨界載荷、臨界波長、后屈曲路徑和翹曲變形與鋼板各向異性程度的關系,揭示了鋼板各向異性對板形平直性缺陷的影響規(guī)律。 ②針對板帶生產中多種不同板形斜向瓢曲現(xiàn)象,研究提出基于初應變或端部反對稱拉伸疊加剪應力或中浪初應變疊加端部反對稱拉伸或中浪初應變疊加剪應力等四種不同的生成機理解釋,建立各自力學模型并實現(xiàn)求解,獲得了斜向瓢曲的屈曲臨界條件與后屈曲路徑及其影響因素與變化規(guī)律。 ③針對一種復雜板形翹曲——反向C翹,建立力學模型,分析翹曲行為,獲得吻合工業(yè)生產現(xiàn)象的變形規(guī)律,提出控制技術措施并取得成功。 (3)針對鋼板帶裁切加工過程結構改變導致板形變化,建模研究板形的演變規(guī)律。提出表觀平直但有“潛”板形缺陷鋼板裁切后翹曲變形的力學機理,計算獲得裁切后各條翹曲與“潛”板形缺陷的關系；建立在線C翹切分后轉化為離線L翹的力學模型,推導出轉化關系公式,并獲得實驗驗證。
[Abstract]:With the increasingly stringent requirements for the quality of strip products in high-end manufacturing industries such as aerospace, automobile, home appliances, and so on, flatness has become the main quality index affecting the competitiveness of products and market share. Flatness generation theory and control technology have become the research frontier and hot spot at home and abroad. Based on the National Natural Science Foundation project "basic Research on residual stress Control in Ultra-high strength Steel Plate leveling and straightening process", the method of combining analysis, simulation and experiment is adopted in this paper. The forming mechanism and deformation behavior of plate shape buckling and warping are studied in order to develop and perfect the shape theory and technology. The main contents and results of this paper are as follows: (1) according to the mechanical mechanism of flatness defects, a new generalization and classification is proposed, and a mechanical model of the generating process of plate shape buckling and warping is established abstractly. A general analytical calculation model and algorithm for plate anisotropy and spline finite element method under initial strain and external load are derived and the MATLAB software is developed. By calculation and comparison, the results of the two methods are consistent with each other and can meet the needs of shape research. (2) aiming at the flatness defect caused by the initial strain of plastic pressure working of steel plate, In this paper, three important problems in the field of shape defect generation are studied by using the calculation model of plate shape buckling and warping. 1 the anisotropy of rolled steel plate and its influence on flatness defect are studied. The critical buckling load, critical wavelength, post-buckling path, warping deformation and anisotropy of steel plate are obtained. The influence of anisotropy of steel plate on flatness defect is revealed. Based on four different generation mechanisms of initial strain or end antisymmetric tensile superposition shear stress or middle wave initial strain superposition end antisymmetric tension or intermediate wave initial strain superposition shear stress, the mechanical models are established and solved. The critical buckling conditions and post-buckling paths of oblique buckling are obtained, and the influencing factors and changing rules are obtained. 3 for a complex shape warpage-reverse C-warping, a mechanical model is established to analyze the warpage behavior. The deformation law consistent with the industrial production phenomenon is obtained, and the control technical measures are put forward with success. (3) in view of the shape change caused by the structural change in the cutting process of the steel strip, the shape evolution law of the plate shape is studied by modeling. This paper puts forward the mechanical mechanism of the warpage deformation after cutting the steel plate with apparent straight but "submerged" shape defects, calculates the relationship between the warpage after cutting and the "submersible" shape defect, and establishes a mechanical model that can be transformed into off-line L warping after on-line C-warping. The formula of transformation relation is deduced and verified by experiment.
【學位授予單位】：北京科技大學
【學位級別】：博士
【學位授予年份】：2015
【分類號】：TG334.9

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