Bumper reinforcement and method for manufacturing the same
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United States of America Patent
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Jul 26, 2016
Grant Date -
Mar 12, 2015
app pub date -
Aug 6, 2014
filing date -
Sep 9, 2013
priority date (Note) -
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status (Latency Note)
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Abstract
A bumper reinforcement is formed of a 7000 series aluminum alloy hollow extrusion and has crushed end portions. A portion of the end portions is heated to a temperature of 400° C. or more for reversion treatment, the heated portion is subjected to cold crushing, and then the whole bumper reinforcement is subjected to age hardening. Because of the age hardening, the heated portion has higher Vickers hardness than non-heated portions by Hv 10 or more. This compensates for a decrease in reaction force in a collision of an end portion resulting from a decrease in the section modulus of the crushed portion and thereby suppresses a decrease in energy absorption.
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