HOT FORMING METHOD HAVING EXCELLENT STRENGTH AFTER FORMING, AND HIGH-STRENGTH HOT-FORMED PART

摘要

PPROBLEM TO BE SOLVED: To provide a hot forming method having excellent strength after forming, and a high-strength hot-formed part. PSOLUTION: In the hot forming method having excellent strength after forming, and the high-strength hot-formed part, a steel plate having the composition consisting of, by mass, 0.05-0.55% C, 0.1 to 3% Mn is used, a part of a punch in contact with the steel plate is characterized in that the inner product of the advancing vector of the punch and the normal vector on the surface of the punch is positive, the steel plate is brought into contact with a die at a bottom dead center, and in some cases, cooling can be performed so that the temperature of the die is maintained at 300C. PCOPYRIGHT: (C)2006,JPO&NCIPI