Investigation of twist in curved hat channel products by elastic-plastic finite element analysis

Abstract

This study concerns twist phenomena occurring in curved hat channel products and aims to clarify the causes of twist using physical quantities obtained by finite element analysis. Several drawing heights were examined. We evaluated the torque around the longitudinal axis, which can be regarded as the driving force of the twist. In addition, transitions of the torque during the process of tool removal were analyzed. After removing the die and blank holder, the twist torque in models with larger drawing heights became negative, accounting for the positive twist, which occurs after punch and pad removal. On the other hand, the twist torque in models with smaller drawing heights remained positive, accounting for the negative twist. Such analyses of the transition of twist torque provide useful information when considering measures for reducing twist.

Influence of the Curvature of the Multipoint Die for Flexible Multipoint Stretch Bending on the Quality of Aluminum Profile

“…With the improvement of people's living standards, low cost and small batch production of various components will become the main way of industrial manufacturing in the future [3,4]. Flexible multipoint stretch-bending technology is a flexible and rapid manufacturing technology, which can use the way of the MPD adjustment method that is used to change the curvature of the MPD in order to compensate springback after unload [5].…”

Analysis and Control of Twist Defects of Aluminum Profiles with Large Z-Section in Roll Bending Process

“…They proposed solutions for reducing twist defects by transversely displacing the stands and adjusting the pressure applied to strips during forming using a pair of rollers for over-forming on a bend. Takamura et al [11] concerned the occurrence of twist phenomenon in curved hat channel products and aimed to clarify the causes of twist using physical quantities obtained by simulation. Chatti et al [12] investigated a novel rolling-based process for three-dimensional bending of pipes with asymmetrical sections and proposed a simple compensation system for twisting of asymmetrical profiles.…”

Effect of Flexible 3D Multipoint Stretch Bending Dies on the Shape Accuracy and the Optimal Design

“…However, the traditional stretch bending is only suitable for mass production rather than small batch production. On one hand, with the improvement of people's living standards, low-cost and small batch production of many kinds of parts and components will be the main way of industrial manufacturing in the future [13,14]. On the other hand, it is difficult for complex cross-sectional profiles to bend in the horizontal direction and vertical direction without unloading condition through the traditional die [15,16].…”