| 摘要 |
PURPOSE:To curtail the number of press dies and to save the equipment cost forming a drawing part with a punch and die and forming a flange part with a blank holder and die face by changing the projection amt. of the blank holder and that of a die face. CONSTITUTION:A drawing part D is formed on a work W between a die 5 and punch 2 by descending the die 5 after placing the work W on both blank holders 3, 4. An another cushion pin 11 is provided between the punch 2 and a bolster after taking off the work W once to interpose a spacer 12 between a lower part insert 7 and the blank holder 3. Said work W is again carried into a press die 1 and placed on the punch 2. The drawing part D is held by the die 5 and punch 2 by descending the die 5 and the lower part insert 7 is projected into the space A of after removing an upper part insert 9 with the movement of the punch 2. A flange part F is then formed at the end part of the work W between the die face 5b whose projection amt. is changed and lower part insert 7.
|
