Study on the influence of different cores on section quality in the process of pure rolling rotary draw bending wrinkling of profiles with "日"-shape section.

Finite element analysis method is used to study the wrinkling of the inner wall of the "日"-shaped profile during the rotary draw bending process in this paper. Based on Abaqus/explicit platform, we establish finite element analysis (FEA) models of rotary draw bending process with flexible core device and rigid core device and discuss the improvement methods of two types of core and the causes of defects in profile forming. Comparing with the forming effect of two kinds of core devices in the rotary draw bending process through FEA, it is proved that adopting a rigid core device can reduce wrinkling obviously. It provides a theoretical basis for the reasonable design of the mold for the "日"-shaped section and has certain reference value for the actual production. [ABSTRACT FROM AUTHOR]