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

Yi Li,Jicai Liang,Rui Li,Fei Teng,Ce Liang

doi:10.1155/2020/5960973

Abstract

The finite element numerical simulation method was used to study the stretch-bending process of asymmetric L-section aluminum alloy profiles. The geometrical parameters of the multipoint dies (MPDs) are studied to influence the shape accuracy and springback of the L-section profile after bending. The results show that the profile curvature of the MPD after the profile is bent has a great influence on the stress-strain distribution, springback value, and shape accuracy. In order to obtain uniform stress-strain of the profile and reduce the springback and shape error, the MPD is optimized by numerical simulation analysis, which has a certain reference value of providing a theoretical basis for the rational design of the flexible stretch-bending.

Highlights

Lightweight is an important issue for the current automotive industry and rail transit system
In the flexible multipoint bending process, the stress-strain distribution, shape accuracy, and springback of the formed part are affected by the different multipoint dies (MPDs) surfaces. erefore, the design of the MPD in the multipoint stretch bending process is crucial
MPDs have a radius of curvature of 100 mm, 500 mm, 1000 mm, 2000 mm, 2500 mm, 2600 mm, 2700 mm, 3500 mm, 4500 mm, 5500 mm, and 6500 mm

Summary

Introduction

Lightweight is an important issue for the current automotive industry and rail transit system. The target shape of the profile in the same section is not much different, a set of MPDs can be shared to reduce the production cost. It is difficult for complex cross-sectional profiles to bend in the horizontal direction without unloading condition to meet accuracy requirements through the traditional solid die [6, 7]. Lin et al determined the suitable number of MPDs for complex cross section profiles in stretch bending to reduce springback [8]. For the asymmetric L-section aluminum alloy profiles, the numerical simulation technology is used to simulate the flexible stretch-bending process. We determine the selection range of curvature of MPD surface for workpiece with a bending radius of 2700 mm

Flexible Multipoint Stretch-Bending Process and Finite Element Model

Numerical Simulation Results and Discussion

Experiment

Conclusion