Door beam

Patent metadata

Field	Value
Publication number	US-10843537-B2
Application number	US-201916561659-A
Country	US
Kind code	B2
Filing date	Sep 5, 2019
Priority date	Nov 22, 2017
Publication date	Nov 24, 2020
Grant date	Nov 24, 2020

Abstract

A door beam includes an aluminum alloy extrusion body extended in a longitudinal direction and having a pair of webs and a pair of flanges to be positioned on an inner side and an outer side in a width direction of a vehicle body. The pair of webs connect the pair of flanges at joint portions of each of the pair of webs such that the pair of webs and the pair of flanges form a closed cross section in a direction perpendicular to the longitudinal direction, and the pair of webs do not have a welded portion.

First claim

What is claimed is:

1. A method of producing a door beam, comprising:
pressing an aluminum billet into a hollow die such that pressed aluminum billet is divided by the hollow die; and
welding divided aluminum billets to one another such that an aluminum alloy extrusion body is formed and extended in a longitudinal direction,
wherein the welding forms a pair of flanges in the aluminum alloy extrusion body such that is weld occurs along the longitudinal edge of the divided aluminum billets the welding does not form a welded portion in a pair of webs in the aluminum alloy extrusion body, the pair of webs and the pair of flanges are to be positioned on an inner side and an outer side in a width direction of a vehicle body, and the pair of webs connect the pair of flanges at joint portions of each of the pair of webs such that the pair of webs and the pair of flanges form a closed cross section in a direction perpendicular to the longitudinal direction.

2. The method of claim 1 , wherein the aluminum alloy extrusion body comprises an aluminum alloy including Al, 3-8 mass % of Zn, 0.4-2.5 mass % of Mg, 0.05 to 2.0 mass % of Cu, and 0.005 to 0.2 mass % of Ti, and further including at least one of 0.01 to 0.3 mass % of Mn, 0.01 to 0.3 mass % of Cr, and 0.01 to 0.3 mass % of Zr.

3. The method of claim 2 , further comprising:
applying press-forming on an end portion in the longitudinal direction such that a distance between the pair of the flanges is narrowed.

4. The method of claim 3 , wherein the aluminum alloy extrusion body is formed such that the aluminum alloy extrusion body is extended in the longitudinal direction and has a same closed cross section in the direction perpendicular to the longitudinal direction, except for the end portion where the press-forming is applied.

5. The method of claim 2 , further comprising:
bend forming the aluminum alloy extrusion body along the longitudinal direction such that the aluminum alloy extrusion body is curved in a convex form toward an outer side in a width direction of a vehicle body.

6. The method of claim 1 , further comprising:
applying press-forming on an end portion in the longitudinal direction such that a distance between the pair of the flanges is narrowed.

7. The method of claim 6 , wherein the aluminum alloy extrusion body is formed such that the aluminum alloy extrusion body is extended in the longitudinal direction and has a same closed cross section in the direction perpendicular to the longitudinal direction, except for the end portion where the press-forming is applied.

8. The method of claim 1 , further comprising:
bend forming the aluminum alloy extrusion body along the longitudinal direction such that the aluminum alloy extrusion body is curved in a convex form toward an outer side in a width direction of a vehicle body.

Assignees

• Kobe Steel Ltd

Inventors

• Yoshida Masatoshi
• Shikama Takahiro

Classifications

• B21C23/142 Primary

  Making profiles · CPC title

• C22C21/10

  with zinc as the next major constituent · CPC title

• B60J5/0444 Primary

  characterised by a special cross section · CPC title

• B60J5/0483

  lightweight metal, e.g. aluminum, magnesium · CPC title

• B60J5/0443

  Beams · CPC title