薄带硅钢心形屈曲机理及预防方法研究

Study on Heart Shaped Buckling Mechanism and Prevention Method of Thin Silicon Steel

为改善薄带硅钢卸卷后出现的心形屈曲缺陷,建立计及层间摩擦力和料卷各向异性的无芯筒工况收卷-卸卷内应力模型。硅钢表面存在涂层,故进行压缩板叠试验得到0.23 mm硅钢径向模量公式。基于压力埋管理论分析料卷心形屈曲机理,并计算了屈曲层数,计算值与现场26组测量值相吻合,验证了理论的正确性。系统分析助卷张力、助卷层数和稳定张力对屈曲层数的影响。研究表明,屈曲层数随助卷张力增加先减小后增加,助卷张力为30MPa时屈曲层数最少,仅35层;助卷张力与稳定张力之差较大时,层间应力差迅速下降,之后由下降转为上升,最后趋于稳定;助卷层数从10层增加到70层,屈曲层数仅减少7层;稳定张力对屈曲层数影响最显著,稳定张力从26 MPa减小到14 MPa屈曲层数减少40层。

In order to prevent the heart-shaped buckling defect of the steel strip after stripping,an internal stress predict model based on elastic theory is developed for the winding and stripping of the coreless coil.In the model,the interlayer friction is taken into account as well as the anisotropy of the coil.Due to the coating layer on silicon steel strips,a plate stacking experiment was performed for strips with a thickness of 0.23 mm in order to determine their radial modulus.Based on the buried pressure tube model,the heart-shaped buckling mechanism is analyzed.Buckling parameters predicted by the model are consistent with the measurements.The influences of assisted winding tension,assisted winding layers,and the stable winding tension on the buckling layers were investigated.It is found that,The number of buckling layers decreases first and then increases with the increase of coiling tension,and the number of buckling layers is the least when the coiling tension is 30 MPa,only 25 layer.When the difference between assisted winding tension and stable tension is large,the interlayer stress difference curve appears sinking section,and the larger the tension difference is,the more obvious the sinking section is.The number of assisted winding layers increases from 10 layers to 70 layers,while the number of buckling layers decreases only by 7 layers.The stable tension has the most significant effect on the number of buckling layers.When the stable tension decreases from 26 MPa to 14 MPa,the number of buckling layers decreases by 40 layers.