TY - GEN
T1 - Instability analysis in incremental rotary forming of tube flanges
AU - Krishnamurthy, Bhaskaran
AU - Bylja, Olga
AU - Watt, Kyle
AU - Conway, Alastair
AU - Tuffs, Martin
AU - Blackwell, Paul
PY - 2021/7/11
Y1 - 2021/7/11
N2 - Rotary forming is an exciting route for forming flanges of different angles from seamless tubes of high-strength materials. True to its incremental nature, the process offers great flexibility, but the issues encountered are atypical and complex. One such issue observed in experimental trials is the internal buckling of tubes during specific instances of flange formation. The origin of this instability is non-trivial, and ordinarily, finite-element (FE) models fail to capture this instability. To analyse and understand the problem, systematic experimental trials were carried out using different tube thicknesses, tube materials, and tool kinematics. This paper summarises the results from a critical analysis to establish (1) a criteria for quantifying the instability and identifying the instances of its occurrence, (2) a validation methodology to fine-tune FE models for the process, and (3) use of FE models to understand the influence of tool path in the flange forming stage.
AB - Rotary forming is an exciting route for forming flanges of different angles from seamless tubes of high-strength materials. True to its incremental nature, the process offers great flexibility, but the issues encountered are atypical and complex. One such issue observed in experimental trials is the internal buckling of tubes during specific instances of flange formation. The origin of this instability is non-trivial, and ordinarily, finite-element (FE) models fail to capture this instability. To analyse and understand the problem, systematic experimental trials were carried out using different tube thicknesses, tube materials, and tool kinematics. This paper summarises the results from a critical analysis to establish (1) a criteria for quantifying the instability and identifying the instances of its occurrence, (2) a validation methodology to fine-tune FE models for the process, and (3) use of FE models to understand the influence of tool path in the flange forming stage.
KW - rotary forming
KW - flange forming
KW - incremental bulk forming
KW - process instabilities
KW - tool kinematics
U2 - 10.1007/978-3-030-75381-8_34
DO - 10.1007/978-3-030-75381-8_34
M3 - Conference contribution book
SN - 9783030753801
T3 - Minerals, Metals and Materials Series
SP - 403
EP - 415
BT - Forming the Future - Proceedings of the 13th International Conference on the Technology of Plasticity
A2 - Daehn, Glenn
A2 - Cao, Jian
A2 - Kinsey, Brad
A2 - Tekkaya, Erman
A2 - Vivek, Anupam
A2 - Yoshida, Yoshinori
PB - Springer
CY - Cham, Switzerland
T2 - The 13th International Conference on the Technology of Plasticity
Y2 - 25 July 2021 through 30 July 2021
ER -