公开(公告)号：US10661335B2

公开(公告)日：2020-05-26

申请号：US15610764

申请日：2017-06-01

Applicant: AGENCY FOR DEFENSE DEVELOPMENT

Inventor： Seong Lee ,  Seong-Ho Yang ,  Lee-Ju Park ,  Hak-Jun Kim ,  Hyoung-Seop Kim ,  See-Am Lee ,  Ho-Yong Um

IPC: B21D22/16 ,  B22D13/02 ,  B21D51/10 ,  B21D22/02 ,  B21D31/00 ,  B22F3/00 ,  B22F5/00 ,  B22F5/10 ,  E21B43/12 ,  E21B43/26

Abstract: In a localized torsional severe plastic deformation method for conical tube metal, a desired region of a conical tube metal can be subjected to severe plastic deformation using molds in which roughness is formed at predetermined regions. The method includes roughening a predetermined region of each of the molds; sticking the conical tube metal only to the roughened regions of the molds; moving the lower mold toward the upper mold to apply a load to the conical tube metal; and rotating the molds to apply severe plastic deformation to the conical tube metal only at the regions stuck to the roughened regions of the molds.