Aisin Seiki Kabushiki Kaisha

Aisin Takaoka Co., Ltd.

Norihiro Akita

Masami Ishii

Wataru Yagi

Masuo Yamada

Yukuo Makimura

Tsutomu Kurikuma

Masahiro Kito

Masahiko Abe

A disc rotor formed of flaky graphite cast iron in which the natural frequency of the disc rotor is set by the graphite length in the flaky graphite cast iron structure. For preventing resonant vibrations ascribable to the self-excited vibrations of the component parts of disc brakes, such as pads, the natural frequency of the disc rotor are shifted from the frequency of excited vibrations of the component parts of disc brakes, such as pads.

Disc rotor

A casting is produced by centrifugal casting in which molten metal of gray cast iron is poured into a cavity formed in a mold during rotation of the mold under centrifugal force. The casting comprises a gray cast iron region and a spheroidal graphite cast iron region from which the graphite structure is gradually transformed toward the gray cast iron region through an intermediate region of vermicular graphite. The spheroidal graphite region and the intermediate region are formed by a reaction of the molten metal with spheroidizing agent in the cavity during rotation of the mold and solidification of the molten metal. The spheroidizing agent is provided in the cavity to a position where the casting is to be increased in strength and abrasion resistance. The spheroidizing agent can be introduced along with the molten metal through the pouring gate into the mold cavity to a defined position of casting.

Method for producing casting with functional gradient

Growing community of inventors

Aichi, Japan

Norihiro Akita