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

doi:10.3901/JME.2023.08.121

Abstract

Abstract: 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.

Key words: thin silicon steel strip, heart-shaped buckling, compression plate stack experiment, coreless, assisted winding

CLC Number:

TG335

WANG Xing-dong, WANG Zi-yang, TANG Wei, LI Jun, LIU Bei, BAI Hao-ke. Study on Heart Shaped Buckling Mechanism and Prevention Method of Thin Silicon Steel[J]. Journal of Mechanical Engineering, 2023, 59(8): 121-131.

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