| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for press-forming a metallic sheet by which formed parts having high dimensional accuracy is obtained by suppressing cracks, wrinkles and shock lines without increasing the number of forming steps in the press-forming of the metallic sheet. SOLUTION: The method for press-forming the metallic sheet while imparting blank holding force is characterized in that the blank holding force at the starting of the forming is set to be≥5% of the tensile strength (TS) of the metallic sheet in terms of tension, punch speed is set to be≤500 mm/s, and the blank holding force is increased and the punch speed is lowered on the midway of a stroke. COPYRIGHT: (C)2006,JPO&NCIPI
|
