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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 10029294 B1

PDFFull Text
Date of Patent:
Jul. 24, 2018

Filed:

Mar. 29, 2013

Method for manufacturing hot-press formed steel-member, and the hot-press formed steel-member

Applicant:

Kobe Steel, Ltd., Kobe-shi, JP;

Inventors:

Takayuki Yamano, Kakogawa, JP;

Noriyuki Jimbo, Kakogawa, JP;

Tatsuya Asai, Kakogawa, JP;

Assignee:

Kobe Steel, Ltd., Kobe-shi, JP;

Attorney:

Oblon, McClelland, Maier & Neustadt, L.L.P.

Primary Examiner:

Pradeep C Battula

Int. Cl.
CPC ...
B21D 22/02 (2006.01); C22C 38/06 (2006.01); C22C 38/58 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/28 (2006.01); C22C 38/32 (2006.01); C22C 38/34 (2006.01); C22C 38/38 (2006.01); C22C 38/42 (2006.01); C22C 38/50 (2006.01); C22C 38/54 (2006.01); B21D 22/20 (2006.01); B32B 15/01 (2006.01); C22C 38/14 (2006.01); C21D 1/18 (2006.01);
U.S. Cl.
CPC ...
B21D 22/022 (2013.01); B21D 22/208 (2013.01); B32B 15/013 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/14 (2013.01); C22C 38/28 (2013.01); C22C 38/32 (2013.01); C22C 38/34 (2013.01); C22C 38/38 (2013.01); C22C 38/42 (2013.01); C22C 38/50 (2013.01); C22C 38/54 (2013.01); C22C 38/58 (2013.01); C21D 1/18 (2013.01); Y10T 428/1241 (2015.01);
Abstract

Provided is a method for manufacturing a hot-press formed steel-member that is capable of reducing LME without causing cracking of a galvanized steel sheet. The method includes using a galvanized steel sheet, as a base steel, having a prescribed chemical composition, heating the galvanized steel sheet to not lower than an Actransformation-point, and executing hot-press forming at least twice after the heating. Every hot-press forming in is executed so that to satisfy the following expression (1): (R/t)>√(a·(T−b)), where 'R' is a curvature radius (mm) of a shoulder of a tool used in the hot-press forming, 't' is a thickness (mm) of the galvanized steel sheet, “T” is a forming-start temperature (° C.) of the hot-press forming, “a” is a constant 0.2984, and “b” is a constant 590.

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