| 摘要 |
PROBLEM TO BE SOLVED: To extend the range of applicable parts by improving the formability of drawing in a method of hot press-forming. SOLUTION: The wrinkle pressing section of a workpiece 5 is pinched with a die 2 and a die cushion 3 from the start of working to a stroke position of maximum 0.3s (s is the stroke from the start of working to the bottom dead center) and, next, the die cushion is stopped after it is moved at higher speed than that of the die to the stroke position of at least 0.7s and the press is operated so as to perform a motion by which the wrinkle pressing section of the workpiece is pinched from there to the bottom dead center. COPYRIGHT: (C)2011,JPO&INPIT |
