共查询到17条相似文献,搜索用时 281 毫秒
1.
为了研究带钢局部高点卷取起筋的控制方法,利用三维弹塑性变形基本理论,并引入带钢塑性流动因子,建立了弹塑性卷取应力和起筋量模型.基于应力函数假设、S.Timoshenko最小功原理和伽辽金虚位移法建立了起筋带钢的应力场分布和可用于在线计算的起筋临界卷取张力设定模型.仿真结果表明:局部高点在径向累积叠加所引起的带钢张力不均匀分布和轴向压应力是导致带钢起筋的主要原因;起筋量随局部高点高度、卷径和卷取张力增加而增大,薄带钢比厚带钢起筋量增幅明显;临界卷取张力随卷径、带钢厚度和局部高点高度增大而减小. 相似文献
2.
3.
4.
5.
6.
带卷中的应力计算和卷取张力最佳化 总被引:2,自引:0,他引:2
一种卷取机械模型已开发成功,并对卷取工序的应力分布能作出很好的判读。特别是该模型指明了带钢厚度形状对卷取缺陷有很大影响,并有助于张力给定值的最佳化。 相似文献
7.
8.
针对热轧带钢在下工序冷轧过程中出现的起筋现象,从热轧角度进行分析,从冷轧带钢起筋位置分析出与热轧带钢断面局部高点、凸度和楔形之间的对应关系.通过对热轧工艺参数的调整,实现了带钢断面大凸度、小楔形和适当的局部高点,减少了冷轧带钢起筋现象,改善了产品质量. 相似文献
9.
10.
11.
12.
Modeling of Stress Distribution During Strip Coiling Process 总被引:1,自引:0,他引:1
Many strip materials are coiled after rolling process. The stresses are imposed on the material wound on the automatically controlled collapse mandrel under the coiling tension. The coiling process can be described by three typical cases: winding without automatic adjustment, winding with automatic adjustment and after mandrel removal. A new model of equations for predicting the stresses during the strip coiling process is built by consideration of the three cases respectively. By solving the equations of different typical cases, the radial stresses and tangential stress of the layers of coil can be calculated. Also, the coiling parameters, such as strip thickness, coiling tension and necking critical pressure, affecting the coil performance are investigated. It is believed that the present model can be used for design and control of the automatically controlled collapse mandrel. 相似文献
13.
14.
15.
The tilted waves in steel strip during rolling and leveling of sheet metal can be classified into two different types of buckling, oblique and herringbone buckling, respectively. Numerical considerations of oblique and herringbone buckling phenomena are dealt with by the spline finite element method (FEM). It is pointed out that the shear stress due to residual strains caused by the rolling process or applied non-uniform loading is the main reason of oblique and herringbone buckle. According to the analysis of stress distribution in plane, the appropriate initial strain patterns are adopted and the corresponding buckling modes are calculated by the spline FEM. The developed numerical model provides an estimation of buckling critical load and wave configuration. 相似文献
16.
某薄取向硅钢复卷线采用了恒张力收卷方案,卸卷后无芯筒料卷约有5%的概率发生心形坍塌,经济损失严重。为了研究心形卷产生机理及影响因素,降低坍塌几率,基于弹性力学叠加原理,建立了料卷收卷-卸卷的连续内应力分布模型;进一步基于压力埋管理论分析了无芯筒薄料卷心形坍塌过程,确定了坍塌区层数;测量了12组带厚为0.23、0.283 mm的心形卷的屈曲半圆心角与屈曲区层数,测量值与理论预测值基本吻合,验证了所提理论的准确性。分析了钢带厚度和粗糙度、橡胶层等效径向刚度对内应力的影响。研究表明,随钢带厚度和粗糙度、橡胶层等效径向刚度的减少,料卷心形坍塌概率及坍塌层数增大;该规律与现场观察一致。通过减小橡胶层厚度、增加橡胶层弹性模量可增大等效径向刚度,大幅减小料卷压应力,降低心形坍塌概率和坍塌区层数。 相似文献
17.
针对带钢连退过程中的热瓢曲问题,充分考虑到连退机组的设备与工艺特点,从内力、外力两方面因素分析了热瓢曲以及横向压应力的产生机理,阐述了热瓢曲的发生规律,首次提出了瓢曲指数的新概念,给出了相应的瓢曲临界条件,建立了一套适合于连退过程的带钢热瓢曲指数的计算模型,定量分析了不同工艺段内带钢瓢曲指数分布规律以及相同工艺段内来料板形、横向温差、炉辊辊型、摩擦因数、设定张力、通板速度等因素对带钢热瓢曲指数的影响,并将相关理论应用到生产实践,开发出了“连退机组通板过程带钢瓢曲预报软件”,实现了对连退过程带钢瓢曲的在线预报,为瓢曲缺陷的预防和控制奠定了坚实的理论基础。 相似文献