Kawasaki Steel Corporation

The Furukawa Electric Co., Ltd.

Toyota Motor Corporation

Toagosei Chemical Industry, Co., Ltd.

Furukawa Aluminum Co., Ltd.

Yoshihiro Matsumoto

Koichi Hashiguchi

Motohiro Nabae

Masatoshi Shinozaki

Takaaki Hira

Nobuo Totsuka

Makoto Imanaka

Yasuji Uesugi

Naoki Nishiyama

Rinsei Ikeda

Toshio Irie

Yoichi Tobiyama

Masaaki Kurihara

Nobuyuki Morito

Yoichiro Bekki

Tadahiro Wakui

Toshiro Hirose

Tomoshige Ono

Toshio Okuyama

Yoshiki Aoyagi

Toru Uno

Kazuhisa Kojima

Yasunobu Uchida

An aluminum alloy sheet combining excellent press formability and spot weldability is disclosed. A chromate film of about 1.0 to 50.0 mg/m.sup.2 expressed in terms of metallic chromium is formed as a first layer on an aluminum alloy sheet, and an organic resin film containing about 60-95% by weight of organic lubricant and having a thickness of 0.02 to 0.90 .mu.m in terms of dry thickness is formed as a second layer on the chromate film. As the organic lubricant, a high-density polyethylene having a mean molecular weight of about 900 to 15,000 and a density of about 0.93 g/ml or more is preferable. This aluminum alloy sheet can be effectively used for automobile body applications.

Aluminum alloy sheet having excellent press formability and spot

A method including preparing an aluminum scrap containing a total of about 0.3 to 2.0 wt % of Fe and Si; melting and then adjusting the material composition so as to attain an Mg content of about 3 to 10 wt % or a composition further containing at least one of the elements Cu, Mn, Cr, Zr and Ti, each in the amount of 0.02 to 0.5 wt %; subjecting the material to casting, hot rolling, cold rolling and continuous annealing to obtain an aluminum alloy sheet having a tensile strength of about 31 kgf/mm.sup.2 or more; and applying a lubricant surface coating to impart a coefficient of friction of not more than about 0.11.

Method of producing an aluminum alloy sheet excelling in formability

Aluminum alloy sheet with improved formability and method of production

A resin composition for a composite-type vibration-damping material which comprises a saturated copolyester having a weight average molecular weight of at least 10,000 and a softening point of 50.degree. to 150.degree. C. and a polyfunctional isocyanate compound as a cross-linking agent and which, when cross-linked, has a degree of gelation (degree of cross-linking) of at least 10% and a composite-type vibration-damping material produced by use of the resin composition, have excellent adhesive strength and formability. When the resin composition is admixed with a conductive substance, a vibration-damping material produced by use of the admixture has excellent spot-weldability in addition to the above-mentioned excellent properties.

Resin composition for composite-type vibration-damping material,

Disclosed is a vibration damping composite laminate of the type comprising a viscoelastic polymer composition layer interposed between two layers of metal, which is high in the damping effectiveness and can readily be spot-welded to metal structures. Essentially the polymer composition is a blend of a polyvinyl acetal resin and particulate carbon which amounts to 10-80 wt % of the composition, on condition that the ratio of the mean particle size of the particulate carbon to the thickness of the polymer composition layer is from 0.5 to 1.7. Optionally the polymer composition may further comprise a polyolefine resin and/or a plasticizer.

Vibration damping composite laminate

A lightweight composite material consisting of two metal sheets and an intermediate layer consisting of a mixture of resin and graphite and held between the metal sheets. The intermediate layer has a specifically limited thickness and a specifically limited graphite content, and the graphite has a specifically limited particle size distribution. The composite material is excellent in the spot weldability, bending rigidity, vibration-damping property and heat insulating property, and can be expected to be widely used as a material for automobile and further materials for industrial machine and architecture.

Spot-weldable lightweight composite material

Growing community of inventors

Chiba, Japan

Yoshihiro Matsumoto