UNDERBRACKET FOR TWO-WHEELED VEHICLE AND THREE-WHEELED VEHICLE, AND PRODUCTION METHOD FOR SAME

WIPO Patent Application WO/2015/111438

A1

　Provided are an underbracket for a two-wheeled vehicle and a three-wheeled vehicle, which has exceptional strength and stress corrosion cracking resistance (SCC resistance); and an advantageous production method for the same. An underbracket for a two-wheeled vehicle and a three-wheeled vehicle which achieves the intended purpose is obtained by: preparing, through hot extrusion at a hot extrusion temperature of 400°C or above, an extruded Al alloy material that comprises an Al alloy containing Zn, Mg, Cu, Mn, and Zr, each in prescribed proportion, that has a microstructure which is a fibrous structure, and that has a surface recrystallized structure layer 0.1 mm or less in thickness; under conditions in which a predetermined temperature is selected as the forging start temperature, and a predetermined temperature is selected as the forging end temperature, hot-forging the extruded Al alloy material to a prescribed shape; and then carrying out a quenching process at an average cooling rate of 3°C/second or faster, until the temperature of the obtained forging reaches 200°C.

MINODA TADASHI (JP)
NAKAI YASUHIRO (JP)
KANEKO RYUICHI (JP)
HIRANO KATSUYA (JP)
YAMAMOTO NOBUJI (JP)

PCT/JP2015/050346

July 30, 2015

January 08, 2015

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UACJ EXTRUSION CORP (JP)
KAYABA INDUSTRY CO LTD (JP)

C22C21/10; B21C23/00; B21K7/12; B62K21/18; C22F1/053; C22F1/00

JPS63297180A	1988-12-05
JP2006316303A	2006-11-24
JPH1030147A	1998-02-03
JPH08144031A	1996-06-04
JPH1171624A	1999-03-16
US20130146183A1	2013-06-13
JPS55500767A	1980-10-09
JP2006316303A	2006-11-24

See also references of EP 2987881A4

NAKASHIMA, Michio et al. (JP)
Nakajima Michio (JP)

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