Honda Giken Kogyo Kabushiki Kaisha

Honda Motor Co., Ltd.

Nissin Kogyo Co., Ltd.

Yusuke Toyoda

Masamune Tabata

Kenji Dosaka

Takahiro Gunji

Katsuhiro Shibata

Takahiro Mizukami

Kenji Hirose

Hiroto Shoji

Takaharu Echigo

Tsunehisa Hata

Satoshi Matsuura

Hiroshi Koinuma

Hiroki Takano

Masashi Hara

Takeo Itou

Hideo Shimizu

Fumiaki Fukuchi

Naoaki Yamamoto

Tsuyoshi Haruhara

Hirohide Shibata

Norito Suzuki

Katuya Nagase

A thin and large high toughness die-cast product is provided that is formed from an Al&#x2014;Mg casting alloy having the composition 3.5 wt %&#x2266;Mg&#x2266;4.5 wt %, 0.8 wt %&#x2266;Mn&#x2266;1.5 wt %, Si&#x3c;0.5 wt %, Fe&#x3c;0.5 wt %, a sum (Ti+Zr) of amounts of Ti and Zr added of equal to or greater than 0.3 wt %, and a ratio (Ti/Zr) of the amounts of Ti and Zr added of at least 0.3 but not more than 2, with the balance being Al.

Die casting having high toughness

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

A slide surface construction is formed of a large number of truncated hexagonal pyramid-shaped metal crystals in a slide surface, with the area rate A of said truncated hexagonal pyramid-shaped metal crystals being in a range of 40%&lE;A&lE;100%. A top face of each of the truncated hexagonal pyramid-shaped metal crystals has a plurality of flat face portions, with a step provided between adjacent ones of the flat face portions. Each of the truncated hexagonal pyramid-shaped metal crystals is a (hhh) oriented metal crystal which has a body-centered cubic structure and whose (hhh) plane (by Miller indices) is oriented toward the slide surface.

Slide surface construction and process for producing the same

An aluminum-based composite member having an increased strength of bond between an aluminum-based body and a cast iron material portion which is incorporated into the aluminum-based body by casting is provided by an improved process. The following steps are employed in the process: a step of removing an oxide film on the surface of the cast iron material portion and activating such surface; a step of forming a protecting plated-layer having a thickness a in a range of 0.8 .mu.m.ltoreq.a.ltoreq.5 .mu.m on the surface of the cast iron material portion; a step of preheating the cast iron material portion in a reducing gas atmosphere and reducing an oxide on the surface of the protecting plated-layer; a step of vanishing the protecting plated-layer by a diffusing phenomenon and forming an aluminum-based alloy plated layer on the surface of the cast iron material portion by immersing the cast iron material portion into a molten aluminum-based alloy; a step of quenching the cast iron material portion in an inert gas atmosphere; and a step of incorporating the cast iron material portion into the aluminum-based body by casting.

Process for producing aluminum-based composite member

A slide surface construction is formed of an aggregate of metal crystals. The area rate A of hexagonal pyramid-shaped metal crystals in a slide surface of the slide surface construction is in a range of A.gtoreq.40%, and the Co (cobalt) content in the aggregate is in a range of Co.gtoreq.13% by weight. The metal crystals are preferably Fe (ferrous) crystals. The slide surface takes on an intricate aspect due to the existing of a large number of hexagonal pyramid-shaped metal crystals and hence, has a good oil retention. In addition, the wearing of the hexagonal pyramid-shaped metal crystals is inhibited due to an increase in hardness resulting from the incorporation of Co and therefore, the oil retention is maintained. Thus, the slide surface construction exhibits an excellent seizure resistance.

Slide surface construction

A slide surface construction of a slide bearing is formed of an aggregate of two different metal crystals. The sliding condition of a first region of the slide bearing is more severe than that of a second region. The (2hhh) oriented metal crystals having a body-centered cubic structure with their (2hhh) planes (by Miller indices) oriented toward a slide surface exist in the first region. The content S.sub.2hhh of the (2hhh) oriented metal crystals is set in a range of S.sub.2hhh .gtoreq.20%. These crystals have a high hardness and are in the form of fish-like metal crystals in the slide surface and hence, an aggregate of these metal crystals has a good oil retention. The (hhh) oriented metal crystals having a body-centered cubic structure with their (hhh) planes (by Miller indices) oriented toward a slide surface exist in the second region. The content S.sub.hhh of the (hhh) oriented metal crystals is set in a range of S.sub.hhh .gtoreq.40%. These crystals are in the form of hexagonal pyramid-shaped metal crystals and hence, an aggregate of these metal crystals has a good oil retention. Thus, it is possible for the two regions with different sliding conditions to exhibit an excellent sliding characteristic.

A slide surface construction is formed of an aggregate of metal crystals on a surface of a slide member. The area rate A of pyramid-shaped metal crystals in the slide surface is in the range of A.gtoreq.40%, and the oxygen (O) content and/or the phosphorous (P) content in the aggregate is in a range of 0.gtoreq.0.2% by weight and P.gtoreq.0.04% by weight. The slide surface takes on an intricate aspect due to the presence of the large number of hexagonal pyramid-shaped metal crystals and hence, has a good oil retention. In addition, the wearing of the hexagonal pyramid-shaped metal crystals is inhibited by an increase in hardness caused by the oxygen contained, and therefore, the oil retention is maintained. Thus, the slide surface construction exhibits an excellent seizure resistance. In addition to oxygen (O) and/or phosphorous (P), the elements that may be added to the aggregate include hydrogen (H), carbon (C) and boron (B).

A slide surface construction is formed of an aggregate of Fe crystals on a surface of a slide member such as a piston, cylinder, piston ring of the like. The area rate A of hexagonal pyramid-shaped Fe crystals in the slide surface is in the range of 40%.ltoreq.A.ltoreq.100%, and the content of Ni in the aggregate is in a range of 1% by weight.ltoreq.Ni.ltoreq.40% by weight. The slide surface takes on an intricate aspect due to the presence of a large number of hexagonal pyramid-shaped Fe crystals and hence, has a good oil retention. The slide surface construction exhibits an excellent corrosion resistance, because it contains nickel (Ni) or chromium (Cr) or both. Thus, the corrosion of the pyramid-shaped Fe crystals is inhibited in a corrosive sliding environment and hence, the oil retention is maintained.

Growing community of inventors

Saitama, Japan

Yusuke Toyoda