| 摘要 |
PROBLEM TO BE SOLVED: To provide a press-forming method including clamping a metal plate with a punch and a die, which improves a forming limit of generating a crack in the metal plate, is easily applicable to a real large-scale press-forming machine, and is conducted at low cost, even if the shape of parts to be formed is complicated or a metal plate stock has high strength, without using special means such as correction of the shape of a press-forming mold such as a punch or die, alteration of the shape or the quality of a blank into a special one, and micro-vibration of the press-forming mold such as a punch or die by use of ultrasonic waves or the like. SOLUTION: In the press-forming method for a metal plate, after starting forming by bringing a punch 10 into contact with a metal plate (100) at first, an operation of separating the punch once from the metal plate, feeding lubricant between the blank 100 and the punch 10, and forming the metal plate again with the same punch and a die 20 is conducted once or more before the punch reaches a terminal end of a stroke to complete the forming of the metal plate. COPYRIGHT: (C)2006,JPO&NCIPI
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