Nippon Steel Corporation

Nippon Steel Sumitomo Metal Corporation

Hiroyuki Mitake

Hiroshi Fukuchi

Kazuto Yamamura

Yasushi Kurisu

Norimasa Yamasaki

Yoshiaki Shia

Yuuichi Ishimori

Tetsuo Shima

Takeshi Kawachi

Shinichi Fukunaga

Masahiro Doki

Tsutomu Haeno

Yoshiaki Kimura

Hiroo Ishibashi

Kazuhisa Tanaka

Junichi Kinoshita

Teruo Kawabata

Kiyoshi Uda

Shizuo Kohinata

Yuji Hiramoto

Kazunori Yasumitsu

Mitsuji Asano

Ryoji Nishihara

Katsuhiro Imanaga

A metal plate material hot molding apparatus is provided for press molding a heated metal plate material. The apparatus may include supply piping for a cooling medium in a mold, and ejection holes penetrating from a molding surface of the mold to the supply piping. The exemplary apparatus may also include discharge piping for the cooling medium situated in the mold, and discharge holes penetrating from the molding surface of the mold to the discharge piping, and cooling piping. Molding procedure can be performed while the cooling medium is ejected from the ejection holes to a gap between the metal plate material and the mold.

Metal plate material hot press molding apparatus and hot press molding method

Apparatus for hot press-forming metal plate material

This invention provides a bending roll apparatus capable of preventing barrel-like deformation of a pipe occurring during a roll bending work and of manufacturing a small diameter elongated pipe. In an apparatus for manufacturing a pipe by pushing rolls to a core roll, feeding a metal sheet to their contact portions and performing a bending work, the bending roll apparatus comprises a core roll formed of a metal and a plurality of push rolls having a surface portion thereof formed of an elastic material and disposed around the core roll. The invention further provides, in a bending roll apparatus, a core roll formed of a metal, a plurality of push rolls formed of a metal and disposed around the core roll, and holding the core roll when a metal sheet is bent, and a guide belt formed of an elastic material, interposed between the core roll and each of the push rolls, contacting on a core roll surface on a side opposite to an entry side of the metal sheet and driven in synchronism with the core roll.

Bending roll apparatus

A plasma torch used for heating a molten steel has an outer cylinder is provided. The torch includes a double tube, the bottom of which is blocked annularly. The torch also includes a bottomed cylindrical anode electrode that is installed within the outer cylinder with a gap existing between the anode electrode and the inside of the double tube. The plasma torch is provided such that pure copper is not used as a material for the anode electrode, the material has a softening point exceeding 150&deg; C., and the ratio of an electric conductivity D of the anode electrode to an electric conductivity N of the outer cylinder satisfies the formula: 0.2&lE;D/N<1.0. The plasma torch prevents the melting loss and wear of the anode electrode caused by the splashes and the heat produced in the anode electrode, suppresses generation of a side arc, shows an extended life, and stabilizes the casting operation and improves the quality of the slab.

Plasma torch used for heating molten steel

A transferred plasma heating anode for heating a molten metal in a container by applying Ar plasma generated by passing a direct current through the molten metal, the transferred plasma heating anode comprising; an anode, composed of a conductive metal, that has an internal cooling structure, a metal protector having an internal cooling structure that is placed outside the anode with a constant gap between the anode and the protector, and a gas supply means that supplies an Ar-containing gas to the gap, is characterized by the central portion on the external surface of the anode tip end being inwardly recessed.

Transfer type plasma heating anode

Growing community of inventors

Chiba, Japan

Hiroyuki Mitake