Pressed component manufacturing method, pressed component, and pressing apparatus

Patent metadata

Field	Value
Publication number	US-11014139-B2
Application number	US-201615567571-A
Country	US
Kind code	B2
Filing date	Apr 21, 2016
Priority date	Apr 22, 2015
Publication date	May 25, 2021
Grant date	May 25, 2021

Abstract

A process of pressing a blank to form an intermediate formed component configured including a top plate, the ridge lines at short direction ends of the top plate, and vertical walls facing each other in a state extending from the respective ridge lines and at least one of the vertical walls configuring a curved wall curving as viewed from an upper side of the top plate, such that a step projecting toward an opposite side to a side on which the vertical walls face each other is formed to the curved wall so as to run along a length direction of the top plate. The method includes pressing the intermediate formed component to narrow a projection width of the step, or to move a portion of the curved wall where the vertical walls face each other.

First claim

The invention claimed is:

1. A manufacturing method for a pressed component configured including an elongated top plate, ridge lines at both short direction ends of the top plate, and vertical walls facing each other in a state extending from the respective ridge lines and at least one of the vertical walls configuring a curved wall curving as viewed from an upper side of the top plate, the manufacturing method comprising: a first process of pressing a blank to form an intermediate formed component configured including the top plate, the ridge lines at both ends, and the vertical walls, and in which a step projecting toward an opposite side to a side on which the vertical walls face each other is formed to the curved wall so as to run along a length direction of the top plate; and a second process of performing at least one out of pressing the intermediate formed component so as to narrow a projection width of the step, or pressing the intermediate formed component so as to move a portion of the curved wall on an opposite side of the step to a portion of the curved wall on the top plate side of the step toward the opposite side to the side on which the vertical walls face each other,
wherein the first process is performed by a first press device and the second process is performed by a second press device;
wherein the first press device presses a blank using a first die and a first punch so as to form the intermediate formed component, and the second press device presses the intermediate formed component with a second die and a second punch, wherein in the first press device,
an elongated first groove configured including an elongated first groove-bottom face and first side faces connected to both short direction ends of the first groove-bottom face is formed in the first die, at least one of the first side faces configures a first curved face that is curved as viewed along a mold closing direction, and that is formed with a first step at a position at a specific depth at a distance of not less than 40% of a depth of the first groove from the first groove-bottom face, the first step having a width of not more than 20% of a short direction width of the first groove-bottom face and running along a length direction of the first side face, and
the shape of the first punch is a shape that fits together with the shape of the first groove during mold closure; and in the second press device,
an elongated second groove configured including an elongated second groove-bottom face and second side faces connected to both short direction ends of the second groove-bottom face is formed in the second die,
at least one of the second side faces configures a second curved face that is curved as viewed along the mold closing direction, and that is formed with a second step at a position at the specific depth from the second groove-bottom face, the step running along a length direction of the second side face,
the second step is narrower in width than the first step, and a separation distance between the second groove-bottom face and the second step in the short direction of the second groove-bottom face is longer than a separation distance between the first groove-bottom face and the first step in the short direction of the first groove-bottom face, and
the shape of the second punch is a shape that fits together with the shape of the second groove during mold closure.

2. The pressed component manufacturing method of claim 1 , wherein, in the first process, taking a position of the top plate as a reference, a portion of the curved wall at a distance of not less than 40% of a height from the top plate position to a lower end of the curved wall is formed with a step having the projection width of not more than 20% of a short direction width of the top plate.

3. The pressed component manufacturing method of claim 1 , wherein, in cases in which at least the projection width of the step is narrowed in the second process, in the second process an angle of a portion of the curved wall further to the top plate side than the step is changed in order to narrow the projection width of the step formed in the first process.

4. The pressed component manufacturing method of claim 1 , wherein, in a cross-section of the second die projected onto a cross-section of the first die, at least part of a portion of the second curved face at an opposite side of the second step to a portion on the second groove-bottom face side is located further outside than a portion of the first curved face at an opposite side of the first step to a portion on the second groove-bottom face side.

Assignees

• Nippon Steel & Sumitomo Metal Corp
• Nippon Steel Corp

Inventors

• Kubo Masahiro
• Yoshida Hiroshi
• Miyagi Takashi
• Suzuki Toshiya
• Nakazawa Yoshiaki

Classifications

• B21D22/26 Primary

  for making peculiarly, e.g. irregularly, shaped articles · CPC title

• B21D5/01

  between rams and anvils or abutments · CPC title

• B21D53/88

  other parts for vehicles, e.g. cowlings, mudguards · CPC title