公开(公告)号：US20180056378A1

公开(公告)日：2018-03-01

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: B22D13/02 ,  B22F5/10 ,  B22F5/00 ,  B22F3/00

CPC classification number: B22D13/02 ,  B21D22/02 ,  B21D31/00 ,  B21D51/10 ,  B22F3/00 ,  B22F5/007 ,  B22F5/106 ,  E21B43/126 ,  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.