Honda Motor Co., Ltd.

Nissin Kogyo Co., Ltd.

Masashi Hara

Hiroto Shoji

Takaharu Echigo

Katsuhiro Shibata

Yusuke Toyoda

Satoshi Matsuura

Takahiro Mizukami

Hiroki Takano

Naoaki Yamamoto

Tsuyoshi Haruhara

Hirohide Shibata

A forming method wherein a billet (B,C) comprising a metal-based composite material () prepared by mixing an aluminum alloy () and a ceramic () is subjected to pressure forming to manufacture a formed article, which comprises carrying out the pressure forming by the use of different compression ratios for different portions of the formed article, wherein a compression ratio means the ratio of the height of a billet before the pressure forming to height of the billet after the pressure forming. The above forming method allows the manufacture of a formed article having different volume contents 8Vf) of the ceramic for different portions thereof.

Method of forming a product of metal-based composite material

A brake drum has its strength elevated in its disk portion. The brake drum is formed from a composition having ceramics dispersed in a matrix. The disk portion has a high ceramic content and thereby a high strength. The brake drum has a disk portion and a cylindrical portion. The disk portion has a first ceramic content by volume and the cylindrical portion has a second ceramic content by volume that is less than the first ceramic content by volume as a result of the application of a higher compression ratio to the disk portion.

Brake drum and process for manufacturing the same

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Sayama, Japan

Masashi Hara