| 摘要 |
Disclosed is a lightweight hollow member, which is highly strong, at e.g., 780 MPa or greater, has complex shapes applicable to automotive components, is highly rigid, and has excellent impact characteristics, and a manufacturing device and manufacturing method, which can form the hollow member by a simple process and have a relatively small and inexpensive molding machine. A manufacturing device 10 is equipped with a feed unit 11 for feeding a hollow steel material 20 with a closed horizontal cross-sectional shape to the lengthwise direction thereof, a support unit 12, which supports this fed material 20 at a first position A, a heating unit 13, which heats the material 20 at a second position B, a horizontal cross-sectional shape change unit 14, which performs work to change the horizontal cross-sectional shape of the material 20 at a third position C, and a cooling unit 15, which cools the material 20 at a fourth position D. |
