Experimental and FE simulation study on cross-section distortion of rectangular tube under multi-die constraints in rotary draw bending process

2014 ◽  
Vol 15 (4) ◽  
pp. 633-641 ◽  
Author(s):  
Kuanxin Liu ◽  
Yuli Liu ◽  
He Yang
Keyword(s):  
Cross Section ◽  
Simulation Study ◽  
Fe Simulation ◽  
Rotary Draw Bending ◽  
Bending Process ◽  
Rectangular Tube ◽  
Draw Bending

Characteristics of Rotary Draw-Bent Tubes for the Hydroforming

2011 ◽  
Vol 213 ◽  
pp. 320-324
Author(s):  
Byeong Don Joo ◽  
Jeong Hwan Jang ◽  
Hyun Jong Lee ◽  
Young Hoon Moon
Keyword(s):  
Cross Section ◽  
Structural Strength ◽  
Dimensional Accuracy ◽  
Thickness Variation ◽  
Important Process ◽  
Rotary Draw Bending ◽  
Higher Dimensional ◽  
Bending Process ◽  
Geometric Size ◽  
Draw Bending

Hydroformed parts have higher dimensional accuracy, structural strength, and dimensional repeatability. The pre-bending process is an important process for the successful hydroforming in the case where the perimeter of the blank is nearly the same as that of final product. At initial pre-bending stage, the variations of wall thickness and cross-section have effects on the accuracy of final products and quality. Because of a relatively excellent productive velocity, geometric size precision and reliance of product qualities, rotary draw bending is widely used. This study shows the bendability such as cross-section ovality, springback ratio and thickness variation in the various conditions of materials.

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.

Sign in / Sign up

Export Citation Format

Share Document