Nippon Steel Sumitomo Metal Corporation

Nippon Steel Corporation

Yoshihiko Masuo

Yoshiaki Nakazawa

Ryuichi Nishimura

Koji Hashimoto

Toshiya Suzuki

Kenichiro Otsuka

Yoshiyuki Ikeda

Toru Yonebayashi

Yorifumi Sakamoto

There is provided a manufacturing apparatus and a manufacturing method for a stretch-formed product which can improve the yield of material in the stretch forming performed while clamping the blank by the lock beads. The manufacturing apparatus for a stretch-formed product includes a die and a blank holder which have clamping surfaces facing each other, a punch that, in a state where a margin of a blank of a sheet material is clamped by the clamping surfaces of the die and the blank holder, relatively presses a forming region of the blank into the die and thereby performs stretch forming on the forming region of the blank, and lock beads that are provided on the clamping surfaces of the die and the blank holder in mutually similar shapes and have first surfaces, second surfaces that intersect with the first surfaces, and third surfaces that intersect with the second surfaces from outer edges toward the centers of the die and the blank holder, the first surfaces each having a plurality of depression-protrusion parts.

Manufacturing apparatus and manufacturing method for stretch-formed product

A press-formed body () made of a high-tensile strength steel sheet of 390 MPa or more including a groove bottom part (), ridge line parts () continuous to the groove bottom part (), and side wall parts () continuous to the ridge line parts (), and in which an outward flange () is formed at an end part in a longitudinal direction is manufactured by a press-forming apparatus including a punch (), a die (), and a pad () which presses and binds a press-forming material () to the punch (), thereby forming the press-formed body () without providing cutouts at a ridge line part flange portion of the outward flange, or generating lowering of material yield.

Manufacturing method and manufacturing apparatus of press-formed body

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Tokyo, Japan

Yoshihiko Masuo