【摘要】：隨著家電、國防、航天等工業(yè)的迅猛發(fā)展,尤其是我國轎車行業(yè)的飛速進步,市場對薄規(guī)格板帶材的需求量越來越多,質(zhì)量要求也越來越高。對于有浪形的板帶材,當(dāng)經(jīng)過輥式矯直機時,浪形會不斷的延展壓縮,板帶材內(nèi)的殘余應(yīng)力會不斷加載與卸載,達到矯直浪形與均衡分布殘余應(yīng)力的效果。當(dāng)前,對于中浪、邊浪等不可展開板形缺陷的矯直研究沒有形成完善的系統(tǒng)理論,尤其薄規(guī)格金屬板帶材板形缺陷復(fù)雜,對矯直模型和技術(shù)的研究更加困難。本論文選取了中浪進行針對性的研究,來得到浪形的矯直規(guī)律�？紤]實際條件的限制,在研究中對中浪進行了簡化,取一塊板材上的單獨中浪進行研究,把中浪看作板材局部的瓢曲變形,這樣便于制作想要的浪形效果。在實驗中根據(jù)中浪的特點對其進行了浪高、浪寬、波長三個參數(shù)進行了定義,圍繞不同參數(shù)的浪形進行各項對比。得到以下幾點結(jié)論:(1)通過矯直對比可以得出浪高與波長對浪形的矯直效果影響較大,浪高、波長越大其矯直難度越大。對于浪高過大的浪形,在矯直后會在原浪形區(qū)域形成連續(xù)的微型浪,且其波長近似為矯直機輥距的二分之一。(2)在矯直過程中浪形區(qū)域會同時向板寬方向和板長方向延展而產(chǎn)生壓縮變形,板材矯直過程主要是縱向纖維的變化,進而改善板材縱向殘余應(yīng)力,對橫向殘余應(yīng)力的改善較小,導(dǎo)致中浪板材矯直后其橫向殘余應(yīng)力大于縱向殘余應(yīng)力。浪形特征對浪形區(qū)域附近的縱向應(yīng)力有影響,對橫向應(yīng)力影響不大。(3)通過有限元建模研究矯直過程的應(yīng)力應(yīng)變演化,研究不同彎輥量與壓下量對矯后板材應(yīng)力和延伸的影響,得到負彎輥矯后板材會呈現(xiàn)中間小兩邊大的應(yīng)力趨勢,且隨著彎輥量的增加板材邊部與中部延伸量差值逐漸增大。
[Abstract]:With the rapid development of home appliances, national defense, aerospace and other industries, especially the rapid progress of China's car industry, the market demand for thin plate and strip is more and more, and the quality requirement is becoming higher and higher. For the plate and strip with wave shape, when it passes through the roller straightening machine, the wave shape will be continuously stretched and compressed, and the residual stress in the plate and strip will be loaded and unloaded continuously, thus achieving the effect of straightening the wave shape and distributing the residual stress evenly. At present, there is no perfect systematic theory on the straightening of the inexpandable plate defects such as medium wave, edge wave, etc. Especially, the defects of thin sheet and strip are complicated, so it is more difficult to study the straightening model and technology. In order to get the straightening rule of wave shape, this paper selects the middle wave to carry on the pertinence research. Considering the limitation of practical conditions, the mid-wave is simplified in the study, and the single mid-wave on a plate is taken to study, and the mid-wave is regarded as the local deformation of the plate, which is convenient for making the desired wave shape effect. In the experiment, the three parameters of wave height, wave width and wave length are defined according to the characteristics of the middle wave, and the wave shapes of different parameters are compared. Some conclusions are obtained as follows: (1) through straightening comparison, it can be concluded that wave height and wavelength have great influence on the straightening effect of wave shape, the higher the wave height, the greater the difficulty of straightening. For waves that are too high, a continuous mini-wave is formed in the original wave area after straightening. The wavelength is approximately 1/2 of the roll distance of the straightening machine. (2) in the process of straightening, the wave region will expand to the width direction and the length direction of the plate at the same time, resulting in compression deformation, and the process of plate straightening is mainly the change of longitudinal fiber. Then the longitudinal residual stress is improved, and the transverse residual stress is slightly improved, which leads to the transverse residual stress being greater than the longitudinal residual stress after the plate is straightened. The characteristics of wave shape have an effect on the longitudinal stress near the wave region, but not on the transverse stress. (3) the evolution of stress and strain in straightening process is studied by finite element modeling, and the effects of different bending roll and reduction on the stress and extension of straightening plate are studied. The results show that the plate will show a large stress trend after the negative bending roll straightening, and the difference between the edge and the middle extension will increase gradually with the increase of the roll bending volume.
【學(xué)位授予單位】：太原科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TG335.5

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