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Title:
TORSIONAL SEVERE PLASTIC DEFORMATION METHOD FOR METAL BAR, EMPLOYING SURFACE POLISHING TO IMPROVE MECHANICAL PROPERTIES OF METAL BAR
Document Type and Number:
WIPO Patent Application WO/2018/174405
Kind Code:
A1
Abstract:
The present invention relates to a torsional severe plastic deformation method for a metal bar, to which surface polishing is applied to improve the mechanical properties of the metal bar. Provided according to an embodiment of the present invention is a torsional severe plastic deformation method for a metal bar, comprising the steps of: applying torsion to a metal bar; and removing surface defects on the surface of the metal bar, which are caused by the torsion application step, wherein the surface defect removal step is carried out by a continuous method in which the surface defect removal step is performed together with the torsion application step or by a discontinuous method in which the torsion application step is paused and then the surface defect removal step is performed, and the surface defect removal step increases the amount of torsional rotation or the shear strain applied to the metal bar.

Inventors:
KIM, Hyoung-seop (9-703, 155 Jigok-ro,Nam-gu,Pohang-si, Gyeongsangbuk-do, 37673, KR)
MOON, Ji-hyun (101- 4501, 195 Gongwon-ro,Seobuk-gu, Cheonan-si, Chungcheongnam-do, 31168, KR)
UM, Ho-yong (3-105, 37 Bupyeongmunhwa-ro,Bupyeong-gu, Incheon, 21387, KR)
YOON, Jae-ik (1-502, 77 Cheongam-ro,Nam-gu, Pohang-si, Gyeongsangbuk-do, 37673, KR)
BAEK, Seung-mi (2102-1203, 55 Convensia-daero 274beon-gil,Yeonsu-gu, Incheon, 22009, KR)
Application Number:
KR2018/001541
Publication Date:
September 27, 2018
Filing Date:
February 06, 2018
Export Citation:
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Assignee:
POSTECH ACADEMY-INDUSTRY FOUNDATION (77 Cheongam-ro, Nam-gu Pohang-si, Gyeongsangbuk-do, 37673, KR)
International Classes:
B21D11/14; B21D11/22; B24B5/22; B24B27/033
Foreign References:
KR20160052985A2016-05-13
JPH1099929A1998-04-21
KR100349074B1
KR20050073125A2005-07-13
KR20070021163A2007-02-22
Attorney, Agent or Firm:
IAM PATENT FIRM (403224, Bongeunsa-roGangnam-gu, Seoul, 06135, KR)
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