Bumper reinforcement and method for manufacturing the same

A technology for bumper reinforcements and manufacturing methods, applied to bumpers, vehicle parts, vehicle safety arrangements, etc., to achieve the effects of increasing reaction force and energy absorption, increasing hardness and strength, and preventing cracking

Active Publication Date: 2015-03-18
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the aluminum alloy is a heat-treated aluminum alloy such as 6000 or 7000 series, it is possible to prevent the damage caused by the flattening process by performing a regression treatment on the end of the bumper reinforcement before the flattening process and performing an age hardening treatment after the flattening process. The resulting cracks, and the overall strength of the bumper reinforcement increased, but this did not substantially improve the problem

Method used

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  • Bumper reinforcement and method for manufacturing the same
  • Bumper reinforcement and method for manufacturing the same
  • Bumper reinforcement and method for manufacturing the same

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Embodiment Construction

[0034] Below, refer to Figure 1~5 The bumper reinforcement of the present invention and its manufacturing method will be described in detail.

[0035] figure 1 The shown bumper reinforcement 1 (semi-finished product before flattening) is obtained by bending a heat-treated aluminum alloy hollow extrusion with a rectangular cross-sectional profile, and includes a central portion 2 parallel to the vehicle body width direction, Left and right end portions 3 bent toward the vehicle body side, and a bent portion 4 connecting the central portion 2 and the end portions 3 . The boundary between the central portion 2 and the curved portion 4 and the boundary between the end portion 3 and the curved portion are indicated by dotted lines. A bumper bracket is provided at the end 3 . Bumper reinforcement 1 is made of T1 quenched and tempered material, which is usually in a slightly hardened state overall due to natural aging. It should be noted that the bending process may be performed...

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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.

Description

technical field [0001] The present invention relates to a bumper reinforcement made of a heat-treated aluminum alloy extrusion and a method of manufacturing the same. Background technique [0002] Patent Documents 1 to 4 describe that, in the end region of an aluminum alloy extruded product composed of a pair of opposed flanges and a plurality of connecting plates connected to the pair of flanges, the Flattening is performed in a direction perpendicular to the flange surface to manufacture automotive reinforcement members such as door beams and bumper reinforcements. Among them, Patent Document 2 describes that a 6000-series (A1-Mg-Si-series) aluminum alloy extruded product subjected to prior quenching is age-hardened and then crushed. In addition, Patent Document 4 describes that a 6000-series or 7000-series (A1-Zn-Mg-series) aluminum alloy extruded product that has been previously quenched is pressed in a state of T1 quenching and tempering after extrusion. Flat machinin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60R19/03C22F1/05C22F1/053
CPCB21D53/88B60R19/18B60R2019/182
Inventor 桥本成一津吉恒武下赤真吾梶原博之
Owner KOBE STEEL LTD
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