Research On Optimization In NC Bending Process Of Thin-walled Tube Based on Orthogonal Experiment

A definition of forming limit is given with minimum centerline radius min R before wrinkling for NC bending process of thin-walled tube. Based on the developed FEM wrinkling prediction system TBWS-3D, an effective searching algorithm of wrinkling limit is proposed and forming limit can be obtained conveniently. Thus influence laws of main forming parameters on wrinkling limit are investigated and revealed. Measures to improve forming limit is put forward consequently. The achievements may help to both practice of thin-walled precise tube bending and research of plastic wrinkling.

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A study on a 3D FE simulation method of the NC bending process of thin-walled tube

Journal of Materials Processing Technology ◽

10.1016/s0924-0136(02)00664-7 ◽

2002 ◽

Vol 129 (1-3) ◽

pp. 273-276 ◽

Cited By ~ 16

Author(s):

M. Zhan ◽

H. Yang ◽

Z.Q. Jiang ◽

Z.S. Zhao ◽

Y. Lin

Keyword(s):

Fe Simulation ◽

Simulation Method ◽

Bending Process ◽

Thin Walled Tube ◽

Thin Walled ◽

Nc Bending

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The interactive effects of wrinkling and other defects in thin-walled tube NC bending process

Journal of Materials Processing Technology ◽

10.1016/j.jmatprotec.2006.11.100 ◽

2007 ◽

Vol 187-188 ◽

pp. 502-507 ◽

Cited By ~ 32

Author(s):

H. Li ◽

H. Yang ◽

M. Zhan ◽

R.J. Gu

Keyword(s):

Interactive Effects ◽

Bending Process ◽

Thin Walled Tube ◽

Thin Walled ◽

Nc Bending

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DEVELOPMENT OF FEM SIMULATION SYSTEM FOR THIN-WALLED TUBE NC BENDING PROCESS

Journal of Mechanical Engineering ◽

10.3901/jme.2003.08.101 ◽

2003 ◽

Vol 39 (08) ◽

pp. 101 ◽

Cited By ~ 5

Author(s):

Yan Lin

Keyword(s):

Fem Simulation ◽

Simulation System ◽

Bending Process ◽

Thin Walled Tube ◽

Thin Walled ◽

Nc Bending

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Optimal Design of the Shape of a Non-Ball Mandrel for Thin-Walled Tube Small Radius Cold Bending

Metals ◽

10.3390/met11081221 ◽

2021 ◽

Vol 11 (8) ◽

pp. 1221

Author(s):

Lu Bai ◽

Jun Liu ◽

Ziang Wang ◽

Shuanggui Zou

Keyword(s):

Ideal Point ◽

Small Radius ◽

Grey Wolf Optimizer ◽

Forming Quality ◽

Hollow Section ◽

Cold Bending ◽

Bending Process ◽

Before And After ◽

Thin Walled Tube ◽

Thin Walled

In the field of cold bending, it is necessary to use ball mandrels, especially to bend thin-walled tubes with a small radius. However, the bending process with a ball mandrel is complex and expensive, and it is easy to jam the core ball inside the tube. To solve these issues, we designed two kinds of hollow non-ball mandrel schemes with low stiffness that were suitable for the small radius bending of thin-walled tubes. We evaluated the forming quality of cold bending numerically and the influence of the hollow section length and thickness on the forming indices. Our results showed that the thickness of the hollow section has a greater influence on forming quality than the length. As the hollow section’s thickness increased, the wrinkling rate first declined by approximately 40% and then increased by above 50%. When the thickness was 11 mm in scheme 1 and 13 mm in scheme 2, the wrinkling rate reached minimum values of 1.32% and 1.50%, respectively. As the hollow section’s thickness increased, the flattening rate decreased by more than 60% and the thinning rate increased by about 40%. A multi-objective optimization of forming indices was carried out by ideal point method and grey wolf optimizer. By comparing the forming results before and after optimization, the feasibility of using the proposed hollow mandrel was proved, and the hollow mandrel scheme of standard cylinder is therefore recommended.

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