公开(公告)号：US20200023427A1

公开(公告)日：2020-01-23

申请号：US16498127

申请日：2018-04-03

Applicant: NIPPON STEEL CORPORATION

Inventor： Kenji TAMURA ,  Kenji IMANISHI ,  Sam Soo HWANG ,  Kunihiro YABUNO ,  Kunihiro YOSHIDA ,  Koichiro ISHIHARA

IPC: B21K1/12 ,  B60G9/04 ,  B60B35/06 ,  B21J5/02

Abstract: The production method includes a first step, a second step and a third step. In the first step, a steel material is forged by dies, whereby a forged product including a rough web part and four plate-shaped rough flange parts is produced. In the second step, at least one specified rough flange part, which is at least one of the four rough flange parts, is pressed by a first die, whereby a first bent portion bending outward in an up-down direction is formed in the specified rough flange part. In the third step, the edge of the first bent portion is pressed by a second die inward in the up-down direction, whereby the edge is deformed and a second bent portion is formed. In the third step, the edge of the specified flange part is deformed while the edge is kept from deforming in a front-rear direction.

公开(公告)号：US20190389251A1

公开(公告)日：2019-12-26

申请号：US16488329

申请日：2018-03-02

Applicant: NIPPON STEEL CORPORATION

Inventor： Kenji IMANISHI ,  Kunihiro YABUNO ,  Kunihiro YOSHIDA ,  Sam Soo HWANG ,  Kenji TAMURA ,  Koichiro ISHIHARA

IPC: B60B35/06 ,  B62D21/02 ,  E04C3/07

Abstract: A disclosed front axle beam includes a beam section. The beam section includes a first flange part, a second flange part, and a web section connecting the first flange part and the second flange part. The web section includes a varying-slope section that includes a plurality of first slope sections and a plurality of second slope sections. Each of the plurality of first slope sections inclines in one direction with respect to the vehicle-height direction in a cross section perpendicular to the longitudinal direction. Each of the plurality of second slope sections inclines in the opposite direction to the one direction with respect to the vehicle-height direction in a cross section perpendicular to the longitudinal direction. The first slope section and the second slope section are located in an alternate manner along the longitudinal direction. In this way, the rigidity of the front axle beam can be increased.