The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 20, 2016
Filed:
Nov. 30, 2012
Postech Academy-industry Foundation, Gyeongsangbuk-do, KR;
Hyoung-Seop Kim, Gyeongsangbuk-do, KR;
Ho-Yong Um, Gyeongsangbuk-do, KR;
Eun-Yoo Yoon, Daejeon, KR;
Dong-Jun Lee, Daejeon, KR;
Seong Lee, Daejeon, KR;
POSTECH ACADEMY-INDUSTRY FOUNDATION, Pohang-Si, Gyeongsangbuk-Do, KR;
Abstract
The present invention relates to a torsional extreme-plastic processing method. In other words, a processing method in which severe plastic deformation based on torsion and compressive force is applied to a material by using a mold to produce miniaturize and nano-size crystal particles in a conic pipe. According to the severe plastic deformation method of the present invention, a punch that matches an inner shape of the conic metal pipe is mounted inside the conic metal pipe, and then a mold that matches an outer shape of the conic metal pipe is mounted outside the conic metal pipe. Thus, microstructures of the conic metal pipe may be ultra-finely crystallized or nano-crystallized through shearing by applying compression and torsion to the conic metal pipe.