共查询到19条相似文献,搜索用时 93 毫秒
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通过引入修正系数m,修正变分法求解辊缝中金属横向流动得出的出口横向位移函数式中的K和N值,以使变形区金属出口横向位移分布接近实际,从而能较准确计算前,后张力的横向分布。m用最不能量原理确定。修正后,前,后张力横向分布的计算值与实测结果基本吻合。 相似文献
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求解冷轧带材金属横向流动和前张应力横向分布的一种新型条元变分 总被引:2,自引:0,他引:2
将变形区划分为许多同条元,根据最小能量原理,通过对单个条件的变分,由欧拉微分方程求得条元上的出口横向位移函数模式,再通过对整个变形区的变分,由一组线性方程直接求得条元节线上的出口横向位移值,进而确定前张应力的横向分布。冷轧窄带和宽带的前张应力横向分布的计量结果与实验结果吻合较好,证明了该理论的正确性。 相似文献
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本文在考虑金属三维变形的基础上,提出了求解轧制压力、两向摩擦力和前后张力等横向分布的条元分析法,为模拟带材轧制过程提供了一个简单、有效的新方法。采用现代测试手段——计算机采样,在300mm四辊可逆式冷轧机上进行了冷轧铝带力参数综合测试:沿轧辊轴向布置九个万能测量装置,测定了单位轧制压力、两向单位摩擦力在变形区内的分布,同时还通过多辊式分段张力检测板形仪,测量了前后张力的横向分布,获得了一些新的规律性认识。在宽、厚比达到620,轧后边浪和中浪、对称 相似文献
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针对以往连退过程中对带钢内部应力横向分布情况无法在线预测,从而对连退过程中的跑偏、瓢曲以及带钢在各工艺段的板形演变无法在线预警、容易造成断带缺陷的问题,充分结合连退机组的设备与工艺特点,在研究了带钢横向温度差、来料板形、炉辊辊型、炉辊水平度与垂直度误差对带钢内部单元变形影响模型的基础上,建立了一套适合于连退过程的带钢内部张力横向分布模型,给出了相应的计算策略,并以宝钢不锈钢有限公司某连退机组为研究对象,定量分析了炉辊原始辊型、来料板形、横向温差以及炉辊水平度与垂直度误差、设定张力等因素对连退过程带钢内部张力横向分布的影响,编制出了相应的"连退机组通板过程带钢内部应力横向分布及板形演变预报软件",并将其应用到生产实践,取得了良好的效果,具有进一步推广应用的价值。 相似文献
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为了探讨利用现有带钢连续退火线生产冷轧钛带产品,基于ABAQUS仿真平台,针对国内某带钢连续退火炉设备条件,建立钛带在退火炉内弹塑性变形的有限元仿真模型,并开展数值模拟研究。结果表明,炉辊辊形、钛带初始板形缺陷及钛带工艺张力大小是钛带张应力横向分布的主要影响因素;钛带的张应力横向分布不均度在凸度辊、单锥度辊和双锥度辊上依次趋于严重;钛带的初始板形缺陷使其张应力横向分布更不均匀,初始有边浪和中浪的钛带都会出现张应力分布不均匀现象;工艺张力对于钛带张应力横向分布均匀性影响不大。针对钛带张应力横向分布的影响因素及其影响规律的研究结果,对于设计炉辊辊形和确定对来料钛带实际板形的要求都具有参考价值。 相似文献
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四辊冷轧带材中张应力横向分布的求解 总被引:2,自引:2,他引:0
以六次偶函数拟合铝带入、出口横向厚度分布,将求解辊系弹性变形的影响函数法与求解金属横向流动的变分法相结合;成功地计算了四辊冷轧机前、后张应力横向分布。计算过程具有较好的收敛性,运算效率高。实验结果与理论计算结果相一致。 相似文献
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Incoldstriproling,thetransversedistributionoftensionstressisadecisivefactorofstripshape.Largenon-uniformtensionstressdistribu... 相似文献
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CVC轧机冷轧宽带材板形控制特性的数值模拟 总被引:11,自引:0,他引:11
以六次偶函数拟合宽带材出口横向厚度分布,计算了CVC轧机冷轧宽带材前张应力横向分布,首次以张应力横向分布的形式,模拟了CVC轧机冷轧宽带材板形控制特性,模拟结果证明:CVC轧机冷轧宽带材时具有很强的板形控制能力。 相似文献
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LIJunhong QIXiang-dong LIANJia-chuang 《钢铁研究学报(英文版)》2004,11(5):32-36
Flatness and profile are important quality indexes of strip. Combining the influence function method to solve the elastic deformation of roll system with the variational method to solve the lateral flow of metal, the flatness and profile of the strip during cold eontinuous rolling were simulated. The B3 spline funetion was used to analogize the lateral distribution of strip thickness. The transverse distributions of the exit thiekness and the front tension stress for eaeh pass were obtained. Compared with the measured results, it is proved that using the spline funetion to analogize the lateral distribution of strip thickness ean improve the ealculation accuraey of flatness and profile largely. 相似文献
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Stream Surface Strip Element Method and Simulation of Three-Dimensional Deformation of Continuous Hot Rolled Strip 总被引:5,自引:0,他引:5
LIUHong-min WANGYing-rui 《钢铁研究学报(英文版)》2004,11(2):18-24
A new method, the stream surface strip element method, for simulating the three-dimensional deformation of plate and strip rolling process was proposed. The rolling deformation zone was divided into a number of stream surface (curved surface) strip elements along metal flow traces, and the stream surface strip elements were mapped into the corresponding plane strip elements for analysis and computation. The longitudinal distributions of the lateral displacement and the altitudinal displacement of metal were respectively constructed to be a quartic curve and a quadratic curve, of which the lateral distributions were expressed as the third-power spline function, and the altitudinal distributions were fitted in the quadratic curve. From the flow theory of plastic mechanics, the mathematical models of the three-dimensional deformations and stresses of the deformation zone were constructed. Compared with the streamline strip element method proposed hy the first author of this paper, the stream surface strip element method takes into account the uneven distributions of stresses and deformations along altitudinal direction, and realizes the precise three-dimensional analysis and computation. The simulation example of continuous hot rolled strip indicates that the method and the model accord with facts and provide a new reliable engineering-computation method for the three-dimensional mechanics simulation of plate and strip rolling process. 相似文献
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