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辽宁生产彩钢卷厂家对彩钢卷受力与变形研究

返回列表 来源: 发布日期: 2020.07.17

辽宁生产彩钢卷厂家对彩钢卷受力与变形研究

天物彩板专注彩板行业16年——辽宁彩钢卷生产厂家_彩涂板受力研究请拨打网站上方电话详细咨询

辽宁彩钢卷生产厂家_彩涂板受力研究_天物彩板

过去,钢卷取过程中的内应力计算都是以钢卷为弹性厚壁圆筒或弹性组合圆筒为基础的。事实上,彩钢卷的厚度一般较大,而且彩钢卷沿圆周具有明显的非圆形特征。彩钢卷按圆曲线处理,计算误差较大。
因此,在热轧彩钢板卷取过程中,随着带钢厚度的增加,带钢沿周向的非圆特性更加明显。然而,以往采用的具有周向对称性的封闭圆柱模型不仅与带材的实际状态偏差较大,而且不能准确预测层间滑移。根据热轧卷取工艺的设备和工艺特点,采用螺旋开口圆筒模型,提出了一套适用于彩钢热轧卷取的钢卷内应力分布模型,考虑到卷取过程中沿周向应力和变形的不均匀性,以及卷头线圈与卷筒接触不完全的特点,并给出了相应的层间滑移判断条件,开发了相应的钢卷内部应力和层间滑移预测软件,并应用于生产实践。
在卷取过程中,随着卷径的增加,某一层彩钢卷的径向压力增大;对于彩钢卷内层,即头部部分增加较多,层间结合概率明显增大;但对于卸料卷,环向应力在钢卷内层的径向应力随层内压力的增加而减小,而层间的周向应力往往随着层间压力的减小而减小,线圈中间的一些层最大值减小。如果初始卷取张力较大,可能出现负值。
对于软质薄的彩钢板卷,当彩钢板卷的张力小于初始设定值而没有抱箍时,钢卷内部的径向应力过小,容易导致层间滑移,造成卷料塌陷。虽然采用较大的张力可以避免卷盘塌陷缺陷,但对于彩钢卷头来说,卷取张力过大,导致前几卷卷产生切向压应力,当钢卷在提升或放置过程中受到冲击干扰时,往往会出现心形缺陷;
针对目前采用的锥形控制的硬核卷取技术,当钢卷出筒时,线圈内层向内收缩。当拉锥曲线下降过大时,拉应力过大有可能引起抽芯。

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

Therefore, with the increase of the strip thickness, the non-circular characteristics of the strip along the circumferential direction are more obvious in the coiling process of the hot-rolled color steel coil. However, the closed cylinder model with circumferential symmetry 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 equipment and process characteristics of hot rolling coiling process, a set of internal stress distribution model of steel coil suitable for hot rolling color steel coiling is proposed by adopting spiral opening cylinder model, considering the nonuniformity of stress and deformation along circumferential direction during coiling process and the feature of incomplete contact between coil head coil and drum, and corresponding judgment conditions of interlayer slip are given The corresponding prediction software of internal stress and interlayer slip of steel coil is developed and applied to production practice.
In the coiling process, with the increase of coil diameter, the radial pressure of a certain layer of color steel coil increases; for the inner layer of color steel coil, that is, the head part increases more, which results in the obvious increase of the bonding probability between layers; however, for the unloading coil, the radial pressure decreases layer by layer from the inside to the outside; and the circumferential stress law is different, The minimum value often occurs in a certain layer inside the coil, and the circumferential stress at the head of the color steel coil decreases with the increase of the pressure, and some layers in the middle of the coil decrease the maximum. If the initial coiling tension is large, negative value may appear.
For the soft and thin color steel coil, when the tension of the color steel coil is less than the initial set value without hooping, the radial stress inside the coil will be too small, which will easily lead to slippage between layers and cause coil collapse. Although the large tension can be used to avoid the coil collapse defect, for the head of the color steel coil, the coiling tension is too large, resulting in the tangential compressive stress on the first few coils, When the steel coil is disturbed by impact during lifting or placing, heart-shaped defects often occur;
In view of the current hard core coiling technology with cone control, when the coil is discharged from the drum, the inner layer of the coil shrinks inward. When the taper curve of tension drops too large, the core pulling is likely to be caused by the too large tensile stress.

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