Postech Academy-industry Foundation

Agency for Defense Development

Ho-Yong Um

Seong Min Lee

Seong-Ho Yang

Hyoung-seop Kim

Dong-Jun Lee

See-Am Lee

Hak-Jun Kim

Hyoung-Seop Kim

Lee-Ju Park

Eun-Yoo Yoon

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.

Localized torsional severe plastic deformation method for conical tube metals

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.

Torsional extreme-plastic processing method of conic metal pipe

Growing community of inventors

Incheon, South Korea

Ho-Yong Um