scholarly journals Twist Springback of Asymmetric Thin-walled Tube in Mandrel Rotary Draw Bending Process

2014 ◽  
Vol 81 ◽  
pp. 2177-2183 ◽  
Author(s):  
Xin Xue ◽  
Juan Liao ◽  
Gabriela Vincze ◽  
Jose Gracio
Keyword(s):  
Rotary Draw Bending ◽  
Bending Process ◽  
Thin Walled Tube ◽  
Thin Walled ◽  
Twist Springback ◽  
Draw Bending

Optimization of an asymmetric thin-walled tube in rotary draw bending process

2013 ◽  
Author(s):  
Xin Xue ◽  
Juan Liao ◽  
Gabriela Vincze ◽  
Jose J. Gracio
Keyword(s):  
Rotary Draw Bending ◽  
Bending Process ◽  
Thin Walled Tube ◽  
Thin Walled ◽  
Draw Bending

Side Wrinkling Characteristics in Rotary-Draw Bending Process of Thin-Walled Rectangular 3A21 Tube

2011 ◽  
Vol 697-698 ◽  
pp. 356-360
Author(s):  
Gang Yao Zhao ◽  
Yu Li Liu ◽  
Shan Tian ◽  
He Yang
Keyword(s):  
Wave Height ◽  
Three Dimensional ◽  
Element Model ◽  
Rotary Draw Bending ◽  
Bending Process ◽  
Dimensional Finite Element ◽  
Thin Walled ◽  
Draw Bending ◽  
Three Dimensional Finite Element ◽  
Aluminum Alloy Tube

Side wrinkling may be produced during rotary-draw bending process of thin-walled rectangular 3A21 aluminum alloy tube if the process parameters are inappropriate. To study the side wrinkling behavior, a three-dimensional finite-element model of the process was developed based on ABAQUS/Explicit code and its reliability was validated by experiment. Then, the side wrinkling characteristics of the tube were investigated. The results show that the side wrinkling wave height in the inner edge of the tube is smaller than that in the out edge of the tube, and the side wrinkling wave height in the neutral layer of the tube is minimal. With the bending process, the side wrinkling wave goes through producing, developing and stabilizing three stages in turn. After bending angle reached 30°, the side wrinkling wave height keeps almost unchanged. Furthermore, the number of the half side wrinkling wave increases evenly.

Plastic Deformation Characteristics Analysis in Rotary-Draw Bending Process of Thin-Walled Rectangular Tube

2010 ◽  
Vol 97-101 ◽  
pp. 320-323
Author(s):  
Gang Yao Zhao ◽  
Yu Li Liu ◽  
He Yang
Keyword(s):  
Plastic Deformation ◽  
Equivalent Stress ◽  
Neutral Plane ◽  
Fe Model ◽  
Deformation Characteristics ◽  
Rotary Draw Bending ◽  
Bending Process ◽  
Rectangular Tube ◽  
Thin Walled ◽  
Draw Bending

The rotary-draw bending process of thin-walled rectangular tube is a complex process with large deformation, large displacement and finite strain which makes the defects, such as wrinkling, distortion and crack be easily produced. To study the complex plastic deformation characteristics, a 3D-FE model for the process was built and validated by experiments. Then simulation and analysis of complex plastic deformation characteristics of the process were carried out. The results show that the distributions of stress and strain are symmetric, and its peak values appear in the edges of tube. With the increase of bending angle, the equivalent stress and equivalent strain initially increase and then reach at a stable value, whereas the fluctuant phenomenon of tangent stress is produced. The moving of the neutral plane of stress can be ignored; however, the moving of neutral plane of strain is more obviously.

Effect of Geometry Parameters on Cross-Sectional Distortion of Thin-Walled Rectangular Tube in Rotary-Draw Bending Process

2011 ◽  
Vol 189-193 ◽  
pp. 2784-2787 ◽  
Author(s):  
Yu Li Liu ◽  
Gang Yao Zhao ◽  
Jin Zhang ◽  
He Yang
Keyword(s):  
Finite Elements ◽  
Geometrical Parameters ◽  
Rotary Draw Bending ◽  
Deformation Degree ◽  
Cross Sectional ◽  
Bending Process ◽  
Rectangular Tube ◽  
Thin Walled ◽  
Draw Bending ◽  
Finite Elements Model

In rotary-draw bending process of thin-walled rectangular tube, cross-sectional distortion is an unwanted byproduct, which is closely related to geometry parameters. To study the effects of geometry parameters on cross-sectional distortion, a 3-D finite-elements model was built under the ABAQUS/Explicit environment, and its reliability was validated by experiments. Then, simulation and analysis of the influence laws of geometrical parameters on cross-sectional deformation degree were carried out. The results show that increases with the increase of b/h and decreases with the increase of R/h when b/h>1. However, R/h has little influence on δh when b/h≤1. And the influence of b on δh is larger than that of h, and the effect of h on δh is larger than that of R.

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