Lateral Bending and Stress Redistribution of High Strength Steel Strip after Longitudinal Slitting

doi:10.3901/JME.2020.18.043

Abstract

Abstract: TMCP has been widely used in the production of high strength steel. Due to the demand for fine grain strengthening, high strength steel strip's fast cooling rate, uneven lateral temperature and unsynchronized cooling, make the control of the internal stress along the transverse during rolling and cooling difficult, and it is easy to cause lateral bending defect after longitudinal slitting, which is a common problem in the production of high strength steel strip. A finite element model is established by ABAQUS combined with FORTRAN subroutine, which is verified by analytical model. The results show that the relationship between the lateral bending and the stress redistribution after longitudinal slitting is closely related. The lo ngitudinal slitting breaks the equilibrium of the initial stress of the strip, and the stress redistributes and reaches the second equilibrium. Combined with the research conclusions, the process optimization of high strength steel levelling in rolling mill is applied, and the outer lateral bending defect of the first and fourth strips of the M510L is well solved, further verifying the validity of the rese arch process and results. The research on the stress redistribution during longitudinal slitting provides theoretical guidance for the prevention of slitting defects.

Key words: high strength steel strip, longitudinal slitting, lateral bending, stress redistribution, finite element method

CLC Number:

TG335

ZHOU Bingying, SHAO Jian, HE Anrui, SI Xiaoming, CUI Yuxuan, WEN Chengcai. Lateral Bending and Stress Redistribution of High Strength Steel Strip after Longitudinal Slitting[J]. Journal of Mechanical Engineering, 2020, 56(18): 43-50.

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