METHOD FOR MANUFACTURING PRESSED COMPONENT

Title:

METHOD FOR MANUFACTURING PRESSED COMPONENT

Document Type and Number:

WIPO Patent Application WO/2019/225661

Kind Code:

A1

Abstract:

Provided is a technique with which it is possible for stretch flange cracking in a curved portion to be suppressed simply and in more stably. Press forming is performed on a component shape including a top plate portion (2) having a curved outer peripheral edge portion (2a) which curves in such a way as to be recessed inward, a vertical wall portion (3A) continuous with the curved outer peripheral edge portion (2a), and a flange portion (4A) continuous with the vertical wall portion (3A). In a state in which a pinched region (P), which is a region including at least a portion of a region corresponding to the top plate portion (2), is pinched between a lower die (20) and a pad (30), an upper die (40) is moved in a pressing direction to bend-form the material being pinched while moving the same toward the vertical wall portion 3 side. A ridge line (20a) for imparting one or more bends is provided to a surface of the lower die (20) that pinches the pinched region (P). The ridge line (20a) is set to a position such that, when the bend-forming has been completed, the position of the top plate portion (2) exists further toward the vertical wall portion (3) than the position of the ridge line (20a).

Inventors:

SHINMIYA TOYOHISA (JP)
YAMASAKI YUJI (JP)

Application Number:

PCT/JP2019/020318

Publication Date:

November 28, 2019

Filing Date:

May 22, 2019

Export Citation:

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Assignee:

JFE STEEL CORP (JP)

International Classes:

B21D22/26; B21D19/00; B21D22/20; B21D24/00

Domestic Patent References:

WO2017002253A1

2017-01-05

Foreign References:

JP5168429B2	2013-03-21
JP2016203214A	2016-12-08
JP5168429B2	2013-03-21
JP2016203214A	2016-12-08
JP2018099807A	2018-06-28
JP2018099808A	2018-06-28

Other References: