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彩钢卷卷取过程

返回列表 来源: 发布日期: 2019.11.27

彩钢卷卷取过程

过去,彩钢卷取过程中的内应力计算是以钢卷为弹性厚壁圆筒或弹性组合圆筒的计算为基础的。事实上,彩钢线圈的厚度普遍较大,而且彩钢线圈沿圆周具有明显的非圆特性。按圆曲线处理彩钢卷,计算误差较大。
彩钢卷在热轧彩钢卷取过程中,随着带钢厚度的增加,卷内带钢沿周向的非圆特性更加明显。然而,以往采用的环向对称的封闭圆柱模型不仅与板带的实际状态有较大偏差,而且不能准确预测层间滑移。根据热轧彩钢卷取过程中设备和工艺的特点,考虑到应力和变形沿圆周分布的不均匀性以及盘头与卷筒不完全接触的事实,采用螺旋开环,建立了一套适用于热轧彩钢卷取的应力分布模型提出了热轧彩钢卷取工艺,给出了相应的层间滑移判断条件,开发了相应的卷取内应力和层间滑移预测软件,并应用于生产实践
彩钢卷在卷取过程中,随着卷径的增大,某一层彩钢卷的径向压力增大,特别是彩钢卷的内层即头部,使层间粘附的概率增大;而对于卸卷,径向压力则逐层减小从内到外分层。但是,环向应力的规律是不一样的。最小值通常出现在线圈内部的某一层。线圈头部的环向应力随压力的增加而减小。线圈中间的一些层降低了最大值。如果初始卷取张力较大,则可能出现负值。

In the past, the calculation of the internal stress in the coiling process of color steel coil was based on the calculation of the steel coil as an elastic thick wall cylinder or an elastic combined cylinder. In fact, the thickness of color steel coil is generally large, and color steel coil has obvious non-circular characteristics along the circumference. If color steel coil is treated according to circular curve, the calculation error will be large.

In the process of coiling hot-rolled color steel, with the increase of the thickness of the strip, the non-circular characteristics of the strip inside the coil are more obvious along the circumferential direction. However, the closed cylinder model with symmetrical circumferential direction used in the past not only has a large deviation from the actual state of the strip, but also can not accurately predict the interlayer slip. Based on the characteristics of the equipment and technology in the process of coiling hot-rolled color steel, the spiral open circle is adopted Considering the uneven distribution of stress and deformation along the circumference and the fact that the coil head is not in full contact with the drum, a set of stress distribution model suitable for coiling of hot-rolled color steel coil is put forward, the corresponding judging conditions of interlayer slip are given, and the corresponding prediction software for the internal stress and interlayer slip of the coil is developed, which is applied to the production practice 。
In the process of coiling, with the increase of coil diameter, the radial pressure of a certain layer of color steel coil increases, especially for the inner layer of color steel coil, i.e. the head, which results in the increase of the probability of adhesion between layers; however, for the coil unloading, the radial pressure decreases layer by layer from the inside to the outside. However, the law of hoop stress is not the same. The minimum value usually occurs in a certain layer inside the coil. The hoop stress at the head of the coil decreases with the increase of its pressure. Some layers in the middle of the coil decrease the maximum value. If the initial coiling tension is large, negative value may appear.
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