METHOD FOR MANUFACTURING STRONG STRUCTURAL MEMBER, AND STRONG STRUCTURAL MEMBER

摘要

PPROBLEM TO BE SOLVED: To provide a method for manufacturing a strong structural member which can manufacture a strong structural member without the need to provide a number of welding equipment, can simplify the behavior of springback at the time of press molding and, at the same time, can ensure the accuracy of a component in a short time. PSOLUTION: A tapered hollow tube 1, which has been integrally formed from a steel sheet S having strain aging properties, is subjected to contracting for reducing the taper, by spinning or swaging, to provide a strain gradient from one end 2a (1a) located on a smaller-diameter side of the hollow tube 2 (1) toward the other end 2b (1b) located on a larger-diameter side. Thereafter, this hollow tube 2 is molded into a component shape followed by heat treatment to manufacture a strong structural member 4 having a strength gradient from one end 4a toward the other end 4b. PCOPYRIGHT: (C)2003,JPO