Deformation Analysis for the Rotary Draw Bending Process of Circular Tubes: Stress Distribution and Wall Thinning

Rotary draw bending is a CNC tube bending process widely used in industry. Compared with pure bending, rotary draw bending involves a much more complex loading condition. In addition to the bending moment, an axial force is generated in the process even if no drawing force is externally applied. Taking this axial force into account, this paper presents an analysis of tube bending. The stress distribution and wall thinning are calculated. Calculations are compared with experimental and numerical results and a good agreement is shown.

[1]  Stelios Kyriakides,et al.  On bend-stretch forming of aluminum extruded tubes — II: analysis , 2001 .

[2]  Stelios Kyriakides,et al.  Effect of yield surface evolution on bending induced cross sectional deformation of thin-walled sections , 2004 .

[3]  Makoto Murata,et al.  Effect of hardening exponent on tube bending , 2008 .

[4]  David A. Field,et al.  Finite element bending analysis of oval tubes using rotary draw bender for hydroforming applications , 2005 .

[5]  Minfeng Chen,et al.  Numerical Solution of Thin‐walled Tube Bending Springback with Exponential Hardening Law , 2010 .

[6]  E Daxin.  Minimum relative bending-radius of tube-bending without mandrel , 2007 .

[7]  Chang-Kyun Oh,et al.  Effects of local wall thinning on net-section limit loads for pipes under combined pressure and bending , 2009 .

[8]  N. C Tang,et al.  Plastic-deformation analysis in tube bending , 2000 .

[9]  L. Brazier.  ON THE FLEXURE OF THIN CYLINDRICAL SHELLS AND OTHER SECTION , 1927 .

[10]  Thomas B. Stoughton,et al.  A general forming limit criterion for sheet metal forming , 2000 .

[11]  Jyhwen Wang,et al.  Tube Bending Under Axial Force and Internal Pressure , 2006 .

[12]  Mei Zhan,et al.  Coupling effects of material properties and the bending angle on the springback angle of a titanium alloy tube during numerically controlled bending , 2010 .

[13]  H. Yang,et al.  Analysis of wrinkling limit of rotary-draw bending process for thin-walled rectangular tube , 2010 .

[14]  Stelios Kyriakides,et al.  On bend-stretch forming of aluminum extruded tubes - I: Experiments , 2001 .