Honda Motor Co., Ltd.

Noriyuki Miyazaki

Michiharu Hasegawa

Naoji Yamamoto

Kazuo Ueda

Masafumi Nakamura

Hiroaki Koyama

Masahito Hasuike

Yasuhiro Shimamura

Toshihiro Miyauchi

Hiroaki Tohyama

Providing a metal mold repair method and a metal mold repair paste agent which are capable of repairing cracks with simple work. A repair paste agent containing components that become an alloy is directly applied to a surface of a metal mold having a crack so as to cover the crack part, subsequently a surface of the repair paste agent is coated with an oxidation inhibitor and the repair paste agent is made to penetrate the inside of the crack by heating and becomes an alloy, thereby filling up the crack.

Metal mold repair method and metal mold repair paste agent

A mold for casting primarily of SMC420, wherein a cavity forming portion comprising maraging steel, which has the toughness and the resistance to heat shock superior to those of SMC420, is provided in a vertical wall heading for a cavity surface from a molten metal inlet and a portion nearest to the molten metal inlet in the cavity surface, which are portions suffering relatively large heat shock in the contact with a molten metal. Also provided is a method for providing the cavity forming portion, which comprises filling a concave portion of the mold with a molten metal prepared by melting a welding rod by arc welding, in other words, carrying out an overlaying welding, and then cooling and solidifying the molten metal.

Mold for casting and method for manufacture thereof

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Tokyo, Japan

Noriyuki Miyazaki