Abstract
In order to obtain a basic understanding of the unwanted distortions in the pipe wall during the press cutting process, the deformation of a thin-walled round pipe to form a curvilinear end was numerically and experimentally studied. Vector analysis was used to study the relationship between the punch shape and the collapse of the cut-end. Stamping experiments on AISI 1020 steel pipe were conducted using different angles α and β defining the shape of the punch. The elasto-plastic finite element method that allows consideration of a ductile fracture was also employed to study the process. The results show that the deformation of the pipe end after press cutting is influenced mostly by the shape of the punch. A satisfactory quality of the curvilinear end of the pipe can be obtained if the appropriate geometric parameters of the punch are chosen. The pipe-wall collapse in the upper part of the section is decreased when α and β increase. The recommended values for α and β lie within 30°–50°. The hole on the underside of the punch has less influence on the quality of the cut-end, and the wall distortion and the generation of burr on the cut-end can be satisfactorily simulated using the fracture criterion of Brozzo or the normalized criterion of Cockcroft and Latham.
Similar content being viewed by others
References
ALVES M L, ALMEIDA B P P, ROSA P A R, MARTINS P A F. End forming of thin-walled tubes [J]. Journal of Material Processing Technology, 2006, 177: 183–187.
ZHAO G Y, LIU Y L, YANG H, LU C H, GU R J. Three-dimensional finite-elements modeling and simulation of rotary-draw bending process for thin-walled rectangular tube [J]. Materials Science and Engineering A, 2009, 499: 257–261.
SUN Zhi-chao, YANG He. Free deformation mechanism and change of forming mode in tube inversion under conical die [J]. Journal of Material Processing Technology, 2006, 177: 171–174.
WEN Tong. Stamping technology of pipe [J]. Metal forming Technology, 1998, 2(16): 33–35. (in Chinese)
GOODARZI M, KUBOKI T, MURATA M. Deformation analysis for the shear bending process of circular tubes [J]. Journal of Material Processing Technology, 2005, 162/163: 492–497.
KASUGA Y, MACHIDA T, KATO N. Effect of cutting conditions on press cutting of a square pipe [J]. Journal of Material Processing Technology, 2003, 143: 716–722.
WEN Tong, WANG Xiao-pei. Geometric parameters analysis of the punch in stamping die of thin wall pipe with arc shaped end [J]. Journal of Chongqing University: Natural Science Edition, 1999, 1(22): 13–17. (in Chinese)
HUSSON C, CORREIA J P M, DARIDON L, AHZI S. Finite elements simulations of thin copper sheets blanking: Study of blanking parameters on sheared edge quality [J]. Journal of Material Processing Technology, 2008, 199: 74–83.
PU Shi-hong, WEN Tong, WU Wei. Theoretical and experimental research on choosing criterion and critical value of ductile fracture [J]. Hot Working Technology, 2009, 3(38): 18–21. (in Chinese)
Author information
Authors and Affiliations
Corresponding author
Additional information
Foundation item: Project(CDJZR10110029) supported by the Fundamental Research Funds for the Central Universities in China
Rights and permissions
About this article
Cite this article
Wen, T., Chen, X. Press cutting of thin-walled round pipe for producing curvilinear end. J. Cent. South Univ. Technol. 19, 304–311 (2012). https://doi.org/10.1007/s11771-012-1005-6
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11771-012-1005-6