| 摘要 |
PURPOSE:To eliminate cracks and wrinkles which are apt to be generated on the shoulder, etc. by drawing by blank holding the outside of a hole of a blank having a windowlike hole and the inside of outer periphery of the blank, and forming a frame by drawing. CONSTITUTION:A framelike blank P in which a hole S somewhat smaller than a specified windowlike hole is pierced is placed on a die 11, and the inside P1, of outer periphery of a blank P is held by the first blank holder 13 and the die 11 using an outer slide 13a. When a punch 12 is lowered, the face of the second blank holder 14 comes into contact with the outside P2 of the hole S of the blank P before the bottom of a drawn part A comes into contact with the blank P, and tarts holding. When the punch 12 is further lowered and compresses an elastic body 17, blanking force is increased. When the punch 12 is positioned at the bottom dead center, blanking force becomes maximum, and good drawing work is carried out at the area D in the part A to be drawn. |
