Nippon Steel Corporation

Isao Arikata

Hirokazu Taniguchi

Toru Ono

Michio Endo

Hiroto Imamura

Mitsuji Hirata

Syoichi Sekiguchi

Koji Akafuji

Shigeki Ogura

The present invention aims to provide a metal mold for glass, which needs not apply any swab in molding of glass, enabling no-swabbing glass forming. The alloy for the mold comprises by weight Cu: 10 to 80%, Al: 4 to 11%, Cr: 3 to 16%, Ni: 2 to 36%, and at least one rare earth element: 0.02 to 2.0% with the balance consisting of Fe and further comprises at least one member selected from the group consisting of Ti: Al%.times.0.5 to 2, V: Al%.times.0.2 to 1, Zr: Al%.times.0.1 to 0.3, and Nb: Al%.times.0.1 to 0.3. The alloy is gradually cooled from the solidification initiation temperature to 50.degree. C. at a cooling rate of 10.degree. C./ min. The surface of the mold is coated with an Al-containing coating or roughened to an average roughness of 0.3 to 5 .mu.m. A solid lubricating film is provided in a fitting portion of the mold, or alternatively a self-lubricating solid is embedded in the fitting portion of the mold.

Metal mold for glass forming

The present invention aims to provide a metal mold for glass, which needs not apply any swab in molding of glass, enabling no-swabbing glass forming. The alloy for the mold comprises by weight Cu: 10 to 80%, Al: 4 to 11%, Cr: 3 to 16%, Ni: 2 to 36%, and at least one rare earth element: 0.02 to 2.08 with the balance consisting of Fe and further comprises at least one member selected from the group consisting of Ti: Al %.times.0.5 to 2, V: Al %.times.0.2 to 1, Zr: Al %.times.0.1 to 0.3, and Nb: Al %.times.0.1 to 0.3. The alloy is gradually cooled from the solidification initiation temperature to 500.degree. C. at a cooling rate of 10.degree. C./min. The surface of the mold is coated with an Al-containing coating or roughened to an average roughness of 0.3 to 5 .mu.m. A solid lubricating film is provided in a fitting portion of the mold, or alternatively a self-lubricating solid is embedded in the fitting portion of the mold.

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Kitakyushu, Japan

Isao Arikata