Suppression of Excess Deformation on Top Portion of Steel Tube after Cold-Reducing through Die

概要

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Deformation of a steel tube was investigated when its outside diameter was cold-reduced through a die. Numerical analyses by axi-symmetric elastic-plastic finite element analysis (FEA) were carried out. When a conventional die with a single die angle was used, the outside diameter of the top portion of the tube became slightly larger, and the wall thickness became thinner than the middle portion. The influences of the wall thickness of the tube and the die angle were investigated. To check the validity of the result, an experiment was carried out. Then, numerical investigation by FEA was carried out to determine the optimum geometry of a die that would decrease the degree suppress this phenomenon followed by an experiment to check validity. The optimum die geometry happened to have the same geometry as that proposed by the authors for suppressing the undershooting phenomenon and the bending phenomenon. It is able to decrease the different level of deformation between the top and the main portion of the tube.
The Japan Society for Technology of Plasticityの論文