BURRING METHOD, BURRING DIE, BURRING DEVICE, AND BURRED ARTICLE

WIPO Patent Application WO/2022/181088

A1

Provided is a burring method for forming a burred part that includes an upright portion and a curved portion in a metal component in which a prepared hole has been formed, said method characterized by including: a preliminary forming step, in which the diameter of the prepared hole is increased, and an edge portion of the prepared hole of the metal component is moved relative to the metal component in a first direction in the thickness direction of the metal component, in a first zone at the periphery of the prepared hole, and the first zone is formed such that the entirety thereof becomes a pre-formed part rising from the metal component in the first direction; and a main forming step, in which the pre-formed part is deformed in a second direction opposite the first direction, and a portion of a third zone closer to the inner diameter of the pre-formed part than a second zone on the outer-diameter side of the pre-formed part is formed so as to become an upright portion and a curved portion, while the second zone reaches the same height as the first zone in the first direction.

OTSUKA KENICHIRO (JP)
AZUMA MASAFUMI (JP)
HAMADA KOICHI (JP)
TABATA RYO (JP)
URUSHIBATA RYO (JP)
KITAHARA YUUKI (JP)

PCT/JP2022/000722

September 01, 2022

January 12, 2022

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NIPPON STEEL CORP (JP)

B21D19/08

JP2017196632A	2017-11-02
JP2004344968A	2004-12-09
JPH01180728A	1989-07-18
JP2018051609A	2018-04-05
JP2021027954A	2021-02-25
JP2018051609A	2018-04-05
JP5636846B2	2014-12-10

MATSUNUMA Yasushi et al. (JP)

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