Influence of different mandrels on cross-sectional deformation of the double-ridge rectangular tube in rotary draw bending process

2016 ◽  
Vol 91 (1-4) ◽  
pp. 1243-1254 ◽  
Author(s):  
Chunmei Liu ◽  
Yuli Liu ◽  
He Yang
Keyword(s):  
Rotary Draw Bending ◽  
Cross Sectional ◽  
Bending Process ◽  
Rectangular Tube ◽  
Draw Bending ◽  
Double Ridge

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.

A New Method to Accurately Describe Cross-Section Distortion in Rotary Draw Bending Process of Thin-Walled Rectangular Tube

2011 ◽  
Vol 117-119 ◽  
pp. 1839-1842
Author(s):  
Gang Yao Zhao ◽  
Rang Yang Zhang ◽  
Yu Li Liu ◽  
Zheng Hua Guo ◽  
Ping Fang
Keyword(s):  
Current Model ◽  
New Method ◽  
Rotary Draw Bending ◽  
Cross Sectional ◽  
Bending Process ◽  
Rectangular Tube ◽  
Side Walls ◽  
Thin Walled ◽  
The Cross ◽  
Draw Bending

To obtain the cross-sectional distortion of thin-walled rectangular tube in rotary draw bending process accurately, a new method to exactly describe the distortion has been proposed. The coupling between the convex of the tube side walls and the concave of the tube flanges is considered in the distortion modeling. Combined with the experiments, the cross-sectional distortion obtained using the new distortion model are compared with the previous ones obtained without considering the convex based on numerical simulations. The results show that cross-sectional distortion obtained by current model is closer to reality than the previous ones. The distortion by current model is more safety in the practical bending process.

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