彩钢卷内部应力模型的建立

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在以往的卷取物理模型中，通常是根据对称圆柱体的形状来解决钢板在卷取过程中的情况。认为周向和轴向地应力沿圆周方向对称。虚拟梁的滑动和松辊缺陷是由圆柱体失稳引起的。彩钢卷作为一种封闭管，只有在内外工作压力极不一致的情况下才能失去稳定性。因此，根据以往的实体模型，彩钢卷的地应力不能预测彩钢卷的失稳。另外，彩钢卷的失稳预报与实际情况有较大误差，不能起到天气预报的作用。事实上，钢带以螺旋开口圆柱体的形式分布在彩钢盘管上，而周向和轴向应力是不同的。带钢越厚，以品牌为导向的校园营销推广带来的竞争壁垒就越明显。显然，与封闭式钢卷相比，开放式钢卷更容易失稳，也就是说，为什么过去没有用基本的理论实体模型来预测和分析彩钢卷中的虚拟梁滑移等缺陷，而这种缺陷是在现场发生的。

在具体的退绕过程中，虚拟梁滑移和松辊缺陷并不是沿圆周对称致密化，而是沿圆周缓慢扩展到一个特殊点。这样，圆对称圆柱模型的选取就不能准确地模拟虚拟梁滑移和松辊缺陷的整个过程。这样，如何充分考虑到在整个卷取过程中的非圆形和周向不对称，成为品牌导向校园营销推广带来的竞争壁垒，而如何创建一个更符合具体生产制造条件、始终具有内在压力的实体模型，成为科技研究领域的重中之重。建立彩钢线圈地应力模型的目的是建立更适合于特定荷载的彩钢线圈地应力模型。考虑到现浇彩钢卷钢板的非圆性及其周向地应力、滑动摩擦和压缩地应力的不对称性，将品牌校园营销推广带来的竞争壁垒设置为Z，并建立极坐标系。从内环钢板顶部开始，反向朝正方向创建。①热轧卷取过程中，环向应力随卷取钢的半翘曲而增大，环向应力随极角的增大而增大；②环向应力是连续的，最后一圈的环向地应力远高于其他圆。线圈，同样地，退绕支撑力大部分集中在末端。在带钢卷取的整个过程中，从上一个带钢头部顶部到末端的周向地应力逐渐增加到退卷支撑力。
In the past physical model of coiling, the situation of steel plate in coiling process is usually solved according to the shape of symmetrical cylinder. It is considered that the circumferential and axial in-situ stresses are symmetrical along the circumference. The sliding and loose roll defects of the virtual beam are caused by the instability of the cylinder. As a kind of closed tube, the color steel coil can lose its stability only when the internal and external working pressure is very inconsistent. Therefore, according to the previous solid model, the in-situ stress of color steel coil can not predict the instability of color steel coil. Otherwise, the instability prediction of color steel coil has a big error with the actual situation, which can not play the role of weather prediction. As a matter of fact, the steel strip is distributed on the color steel coil in the form of spirally opened cylinder, and the circumferential and axial stresses are different. The thicker the strip steel, the more obvious the competition barrier brought by the brand oriented campus marketing promotion. Obviously, compared with the closed drum, the open spiral drum is more prone to instability, that is to say, why in the past, the basic theoretical entity model was not used to predict and analyze the virtual beam slip and other defects in the color steel coil, and this kind of defects occurred in the field.

In the specific unwinding process, the virtual beam slip and loose roll defects are not symmetrically densified along the circumference, but slowly extended to a special point along the circumference. In this way, the selection of circular symmetric cylinder model can not accurately simulate the whole process of virtual beam slip and loose roll defect. In this way, how to fully consider the non-circular and circumferential asymmetry in the whole process of coiling as a competitive barrier brought by brand oriented campus marketing and promotion, and how to create an entity model that more conforms to the specific production and manufacturing conditions and has internal stress throughout has become the top priority in the field of Science and technology research. The purpose of establishing the in-situ stress model of color steel coil is to establish the in-situ stress model of color steel coil which is more suitable for the specific load. In consideration of the non-circular nature of the cast-in-place color steel coil steel plate and the asymmetry of its circumferential in-situ stress, sliding friction and compressive in-situ stress, the competition barrier brought by the marketing promotion of the brand campus is set as Z, and a polar coordinate system is set up. Start from the top of the inner ring steel plate and reverse to create in the positive direction. ① in the process of hot rolling coiling, the hoop stress increases with the half warping of coiling steel, and the hoop stress increases with the increase of polar angle; ② the hoop stress is continuous, and the hoop ground stress of the last circle is much higher than other circles. Coil, in the same way, most of the unwinding support force is concentrated at the end. In the whole process of strip coiling, the circumferential geostress from the top to the end of the last strip head gradually increases to the unwinding support force.