Research on ridge buckle of high accuracy cold rolled thin strip at local high points during the coiling process

摘要

Small, narrow waves accompany ridge buckle after a thin strip is uncoiled. The two reasons for this can be judged as: 1) The existence of local small waves after a strip has been cold rolled; 2) Longitudinal deformation due to a second buckling after local high point superposition during the coiling process. The phenomenon presents as a narrow wave shape after the strip is uncoiled. Based on the fundamental theory of elastic mechanics in analyzing the relation between local high points and ridge buckle during the coiling process, this article sets up a three-dimensional model for the coiling process through ANSYS/LS-DYNA Finite Element software. This model simulates well the appearance of local high points during coiling, and the Finite Element model for coiling can truly reflect deformation due to force in the coiling process of a strip. This article also analyzes the changes to local high points during the coiling process, and the dependent variable of the second buckling on a strip, caused by different local high points. A control range is then found of local high points for strips of different thicknesses; in order to reduce the generation of local plastic deformation, and to indicate the forming mechanism of the second ridge buckle after rib point stress superposition during the coiling process. The article provides theoretical and data support for the control of ridge-buckle and ridge buckle on high accuracy cold rolled thin strip during the coiling process.