Burring Method, Burring Die, Burring Device, And Burred Article

Abstract: 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.

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