公开(公告)号：US20240100583A1

公开(公告)日：2024-03-28

申请号：US18277348

申请日：2022-01-12

Applicant: NIPPON STEEL CORPORATION

Inventor： Kenichiro OTSUKA ,  Masafumi AZUMA ,  Koichi HAMADA ,  Ryo TABATA ,  Ryo URUSHIBATA ,  Yuuki KITAHARA

IPC: B21D19/08 ,  B21D37/08

CPC classification number: B21D19/088 ,  B21D37/08

Abstract: Provided is a burring processing method, which is a method for forming a buffing processed portion including a raised portion and a curved portion in a metal component having a pilot hole formed therein, the method being characterized by including: a preforming step of enlarging a diameter of the pilot hole, moving an edge portion of the pilot hole relative to the metal component in a first direction of a thickness direction of the metal component in a first range around the pilot hole of the metal component, and forming the whole first range into a preformed portion raised from the metal component in the first direction; and a main forming step of deforming the preformed portion in a second direction opposite to the first direction, forming a second range on an outer diameter side of the preformed portion to have the same height as the first range in the first direction, and forming part of a third range on an inner diameter side of the preformed portion from the second range to be part of the curved portion and the raised portion.

公开(公告)号：US20230399729A1

公开(公告)日：2023-12-14

申请号：US18032108

申请日：2021-10-13

Applicant: NIPPON STEEL CORPORATION

Inventor： Kohei NAKADA ,  Ryo TABATA ,  Takeshi KAWACHI ,  Takeshi TOYODA

IPC: C22C38/60 ,  C22C38/58 ,  C22C38/54 ,  C22C38/52 ,  C22C38/50 ,  C22C38/48 ,  C22C38/46 ,  C22C38/44 ,  C22C38/42 ,  C22C38/34 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00

CPC classification number: C22C38/60 ,  C22C38/58 ,  C22C38/54 ,  C22C38/52 ,  C22C38/50 ,  C22C38/48 ,  C22C38/46 ,  C22C38/44 ,  C22C38/42 ,  C22C38/34 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/008 ,  C22C38/005 ,  C22C38/002 ,  C22C38/001 ,  B62D29/007

Abstract: As a burring processed member able to suppress the formation of fatigue cracks in a burring part, one having a structure satisfying the following relations (1) to (3) is disclosed: 3≤Ra≤100 . . . (1), 3.0

公开(公告)号：US20240270325A1

公开(公告)日：2024-08-15

申请号：US18563240

申请日：2022-05-25

Applicant: NIPPON STEEL CORPORATION

Inventor： Masahiro KUBO ,  Shunji HIWATASHI ,  Yutaka MIKAZUKI ,  Koichi SATO ,  Takahiro AITOH ,  Kengo TAKEDA ,  Katsuya NAKANO ,  Yuri TODA ,  Shinichiro TABATA ,  Kodai MURASAWA ,  Daisuke MAEDA ,  Kazuo HIKIDA ,  Kazuhisa KUSUMI ,  Shingo FUJINAKA ,  Jun HAGA ,  Ryo TABATA ,  Ryoma KATO ,  Mitsuharu YAMAGATA ,  Toshiyuki NIWA ,  Hiromi ASAMA ,  Junichiro SUZUKI ,  Yasunori ITO

IPC: B62D29/00 ,  B23K11/11 ,  B23K103/04 ,  C21D7/13 ,  C21D9/46 ,  C22C38/60

CPC classification number: B62D29/007 ,  B23K11/11 ,  C21D7/13 ,  C21D9/46 ,  C22C38/60 ,  B23K2103/04 ,  C21D2211/002 ,  C21D2211/008

Abstract: What is provided is an automobile body in which batteries, tires, and liquids containing water and oil are removed from a public road vehicle with superior collision safety, the public road vehicle comprising at least a steel material containing a steel sheet with a tensile strength of 1180 MPa or higher, a non-ferrous metal material, and a resin material, wherein



the ratio of a mass mh (kg) of the steel sheet having a tensile strength of 1180 MPa or higher to a mass m (kg) of the automobile body is 9% or higher, and
a mass m (kg) of the automobile body and a projected area s (m2) of the automobile body from an upper side satisfy a formula (1) and a formula (2)











6

公开(公告)号：US20220250132A1

公开(公告)日：2022-08-11

申请号：US17623559

申请日：2020-07-02

Applicant: NIPPON STEEL CORPORATION

Inventor： Ryo TABATA ,  Yasuhiro ITO

IPC: B21D22/26 ,  B21D53/88

Abstract: This manufacturing method of a structural member includes an intermediate step and a bending step. A height difference is provided on a bottom wall of a groove part between an intermediate position and both end positions sandwiching the intermediate position therebetween in a longitudinal sectional view in an extending direction of the groove part by the pressing in the intermediate step, and thereby at least one of a first curved part which has a concave curved shape in a plan view and a convex curved shape in the longitudinal sectional view and a second curved part which has a convex curved shape in the plan view and a concave curved shape in the longitudinal sectional view is formed on the bottom wall.

公开(公告)号：US20240198746A1

公开(公告)日：2024-06-20

申请号：US18288911

申请日：2022-05-11

Applicant: NIPPON STEEL CORPORATION

Inventor： Ryoma KATO ,  Ryo TABATA ,  Takeshi KAWACHI

IPC: B60G7/00

CPC classification number: B60G7/001 ,  B60G2206/122 ,  B60G2206/722

Abstract: The present disclosure provides a structural member comprising an edge portion T1 and an edge portion T2 opposing the edge portion T1 in plan view in height direction (Z axis direction); when an axis direction connecting the edge portion T1 and the edge portion T2 is regarded as an X axis direction, the structural member includes, along the X axis direction, a region A including the edge portion T1, and a region B located on the edge portion T2 side than the region A and including the edge portion T2; in a cross-section perpendicular to the X axis direction, the region A includes a closed cross-section portion A whose outer rim shape is one closed cross-section A; and the region B includes a closed cross-section portion B satisfying a predetermined (i) or (ii).

公开(公告)号：US20240123782A1

公开(公告)日：2024-04-18

申请号：US18276621

申请日：2022-03-28

Applicant: NIPPON STEEL CORPORATION

Inventor： Kenichiro OTSUKA ,  Masafumi AZUMA ,  Koichi HAMADA ,  Ryo TABATA ,  Ryo URUSHIBATA ,  Yuki KITAHARA

IPC: B60G7/00

CPC classification number: B60G7/001 ,  B60G2206/10

Abstract: A suspension arm includes a main body. The main body includes a curved portion curved along a longitudinal direction and has a closed section. The main body includes an inner side wall, an outer side wall, a first side wall, and a second side wall. The inner side wall corresponds to an inner side of a curve of the curved portion. The outer side wall corresponds to an outer side of the curve of the curved portion. A thickness of the inner side wall is larger than a thickness of the outer side wall. In sectional view of the main body perpendicular to the longitudinal direction, each of a length of the first side wall and a length of the second side wall is longer than each of a length of the inner side wall and a length of the outer side wall.

公开(公告)号：US20220241838A1

公开(公告)日：2022-08-04

申请号：US17626321

申请日：2020-07-10

Applicant: NIPPON STEEL CORPORATION

Inventor： Jun NITTA ,  Takashi YASUTOMI ,  Ryo TABATA

IPC: B21D28/34 ,  B21D28/14 ,  B23D15/08

Abstract: The present invention has as its technical problem to provide a punching method able to stably secure a stretch-flangeability equal to or greater than the case of using a punch having a flat blade at its bottom surface. The punching method of the present invention is a method of punching a metal sheet using a punching and shearing device provided with a punch having an upper blade having a horizontal part with respect to the cutting line in part and having parts other than the horizontal part comprised of inclined parts and a die having a lower blade wherein the upper blade used for the punching process has a shape where the inclined parts first contact the metal sheet at the time of a punching process.

公开(公告)号：US20240367470A1

公开(公告)日：2024-11-07

申请号：US18289082

申请日：2022-05-20

Applicant: NIPPON STEEL CORPORATION

Inventor： Ryo TABATA ,  Yasuhiro ITO ,  Takeshi KAWACHI ,  Masahiro NAKATA

IPC: B60G7/00

Abstract: A structural part includes a part body and a cylindrical bush. The part body includes a through-hole and a cylindrical flange part provided in the periphery of the through-hole. The bush is inserted into the through-hole and the flange part. When seen in a cross section including a central axis of the bush, the flange part has a height difference between a first part that contacts the bush on one side in a direction perpendicular to the central axis and a second part that contacts the bush on the other side.

公开(公告)号：US20210268566A1

公开(公告)日：2021-09-02

申请号：US17259497

申请日：2018-07-31

Applicant: NIPPON STEEL CORPORATION

Inventor： Ryo TABATA ,  Masahiro SAITO

IPC: B21D19/08

Abstract: A strength flanging method which improves the method of stretch flanging by press forming so as to disperse strain generated during a forming operation in a blank and in turn prevent the formation of cracks at the center of an arc part, which strength flanging method performs stretch flanging using a stretch flanging tool provided with a top surface part having a protruding part in a top view, straight wall parts, a main slanted wall part between the top surface part and the straight wall parts positioned forming an angle with the top surface part of more than 0° and less than 90° and with the straight wall parts of 10° or more and less than 90° and having two intersecting ridgelines at the straight wall part sides, a first sub slanted wall part sharing one ridgeline among the two ridgelines with the main slanted wall part and positioned forming angles with the top surface part and a straight wall part of more than 0° and less than 90°, and a second sub slanted wall part sharing the other ridgeline among the two ridgelines with the main slanted wall part and positioned forming angles with the top surface part and a straight wall part of more than 0° and less than 90°.