Multi-point forming springback compensation control oftwo-dimensional hull plate

Shaojuan Su,Yeping Xiong,Yuchao Jiang

doi:10.1177/1687814020916094

Shaojuan Su, Yeping Xiong + Show 1 more

Open Access

https://doi.org/10.1177/1687814020916094

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Abstract

Springback is always a technical problem in sheet metal forming. In this article, the rapid springback compensation control of two-dimensional hull plate is realized by theoretical calculation and numerical simulation. For the cylindrical shell, according to the bending forming theory of medium and thick plates, the total elastic-plastic bending moment is established, and the curvature change before and after springback is deduced. The curvature correction coefficient is determined by the precise numerical simulation technology. At the same time, the validity of the method is verified by cold bending experiment. For the shell with variable curvature, it is divided into several cylindrical surfaces according to the curvature gradient of its geometric section line. The compensation curvature array is obtained by the correction compensation algorithm of springback curvature of cylindrical plate, and the algorithm is verified by numerical simulation. The results show that the method is very close to the expected results. Thus, the efficiency and precision of forming will be improved, and the foundation of digitization of sheet metal forming is established.

Highlights

The formation of hull shells, especially of large curved shells, has always been a most difficult problem in the field of plastic hull processing
According to the bending forming theory of medium and thick plates, the inner material elements stress and strain are determined by the width (W )-thickness (t) ratio W =t and the relative bending curvature k
The theoretical calculation model of sheet metal forming is corrected based on the advanced equipment of asymmetric pressure square head CNC cold bending machine

Summary

Introduction

The formation of hull shells, especially of large curved shells, has always been a most difficult problem in the field of plastic hull processing. Keywords Springback compensation, surface reconstruction, numerical simulation, two-dimensional shell, forming theory The accurate numerical simulation method is used to correct the springback curvature to effectively control springback and improve forming precision.

Results

Conclusion