US 11,986,874 B2
Method of manufacturing press-formed article, press-formed article, and press forming apparatus
Atsushi Ono, Tokyo (JP); Yoshiaki Nakazawa, Tokyo (JP); and Satoshi Shirakami, Tokyo (JP)
Assigned to NIPPON STEEL CORPORATION, Tokyo (JP)
Appl. No. 17/632,502
Filed by NIPPON STEEL CORPORATION, Tokyo (JP)
PCT Filed Aug. 5, 2020, PCT No. PCT/JP2020/030076
§ 371(c)(1), (2) Date Feb. 2, 2022,
PCT Pub. No. WO2021/025083, PCT Pub. Date Feb. 11, 2021.
Claims priority of application No. 2019-143704 (JP), filed on Aug. 5, 2019; and application No. 2019-230803 (JP), filed on Dec. 20, 2019.
Prior Publication US 2022/0280992 A1, Sep. 8, 2022
Int. Cl. B21D 22/06 (2006.01); B21D 3/10 (2006.01); B21D 19/08 (2006.01); B21D 22/22 (2006.01); B21D 22/26 (2006.01); B21D 24/00 (2006.01); B21D 24/04 (2006.01); B21D 35/00 (2006.01)
CPC B21D 22/26 (2013.01) [B21D 22/22 (2013.01); B21D 24/04 (2013.01); B21D 22/06 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A method of manufacturing a press-formed article including:
a top sheet portion,
a peripheral wall portion formed along three peripheral edge portions of the top sheet portion and extending from the peripheral edge portions in a direction intersecting an extending direction of the top sheet portion,
a floor flange portion extending outward from an end portion of the peripheral wall portion opposite to an end portion continuous with the top sheet portion in a direction intersecting an extending direction of the peripheral wall portion,
a side standing flange portion extending outward from a circumferential end portion of the peripheral wall portion, and
an inclined flange portion that is an inclined wall continuous between the side standing flange portion and the floor flange portion, the method comprising:
first press forming; and
second press forming,
wherein an intermediate formed article is formed from a metal sheet by subjecting the metal sheet to the first press forming including:
moving the metal sheet sandwiched between a first holder and a first die relative to a first punch in a state in which a portion of the metal sheet to be the floor flange portion is sandwiched between the first holder and the first die to perform draw-forming on the metal sheet to form the peripheral wall portion,
bending the metal sheet by the metal sheet abutting on a first punch protrusion forming portion provided at the first punch to form a convex flange portion having a convex shape formed at the inclined flange portion, and
bending the metal sheet by the metal sheet abutting on the first punch to form at least a side standing flange main body portion located on a side opposite to the inclined flange portion with respect to an end portion on the inclined flange portion side of the side standing flange portion and a floor flange main body portion located on a side opposite to the inclined flange portion with respect to an end portion on the inclined flange portion side of the floor flange portion, and
wherein the second press forming includes:
bending the intermediate formed article by a second die and a second punch to form the convex flange portion at the inclined flange portion.
 
8. A press forming apparatus for obtaining a press-formed article including:
a top sheet portion,
a peripheral wall portion formed along three peripheral edge portions of the top sheet portion and extending from the peripheral edge portions in a direction intersecting an extending direction of the top sheet portion,
a floor flange portion extending outward from an end portion of the peripheral wall portion opposite to an end portion continuous with the top sheet portion in a direction intersecting an extending direction of the peripheral wall portion,
a side standing flange portion extending outward from a circumferential end portion of the peripheral wall portion, and
an inclined flange portion that is an inclined wall continuous between the side standing flange portion and the floor flange portion, the press forming apparatus comprising:
a first holder having a portion abutting on a region to be the floor flange portion on one surface of a metal sheet;
a first die including a portion abutting on a region to be the floor flange portion on another surface of the metal sheet, a portion sandwiching the metal sheet between the first holder and the first die, and a portion abutting on a region to be the peripheral wall portion of the metal sheet;
a first punch, the first punch including
a first punch peripheral wall forming portion that abuts on a region to be the peripheral wall portion of the one surface of the metal sheet and performs draw-forming on the metal sheet together with the first die to form the peripheral wall portion,
a first punch protrusion forming portion that abuts on a region to be the inclined flange portion of the one surface of the metal sheet and bends the metal sheet together with the first die to form a convex flange portion,
a first punch standing flange forming portion that abuts on a region to be the side standing flange portion of the one surface of the metal sheet and bends the metal sheet together with the first die to form at least a side standing flange main body portion located on a side opposite to the inclined flange portion with respect to an end portion of the side standing flange portion on the inclined flange portion side, and
a first punch floor flange forming portion that abuts on a region to be the floor flange portion of the one surface of the metal sheet and bends the metal sheet together with the first die to form at least a floor flange main body portion located on a side opposite to the inclined flange portion with respect to an end portion of the floor flange portion on the inclined flange portion side;
a second die including an inclined surface abutting on an other surface of the convex flange portion; and
a second punch, the second punch including a second punch inclined surface portion which is provided on the one surface side of the convex flange portion and bends the inclined flange portion from the convex flange portion by sandwiching the convex flange portion with the second die.