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    • 1. 发明授权
    • Press forming method and press apparatus
    • US12070787B2
    • 2024-08-27
    • US17425614
    • 2020-01-24
    • NIPPON STEEL CORPORATION
    • Minoru SugawaraYasuharu TanakaTakashi MiyagiMisao OgawaJunki Natori
    • B21D22/22B21D19/08B21D24/04B21D53/88
    • B21D22/22B21D19/08B21D24/04B21D53/88
    • A press forming method includes a first step of pinching one part of a metal sheet by means of a die and a pad, and a second step of moving a punch in a direction in which the punch approaches the die relatively to perform press forming on the metal sheet. The die has a first support surface which has an edge including a curved portion. The pad has a second support surface facing the first support surface of the die. The first support surface includes a first flat portion, and a first deformation portion which protrudes or is recessed with respect to the first flat portion. The second support surface includes a second flat portion which faces the first flat portion, and a second deformation portion which is recessed or protrudes with respect to the second flat portion so as to correspond to the first deformation portion. The first deformation portion is provided on a normal line of the curved portion as viewed from a pressing direction. When a space between the first deformation portion and the second deformation portion is assumed to be a deformation space, in the second step, press forming is performed so that portions of the metal sheet which are on both sides of the deformation space flow into the deformation space, and the metal sheet deforms along the first deformation portion and the second deformation portion in the deformation space.