| 摘要 |
PURPOSE:To perform preliminary bending and drawing simultaneously in a process by providing the first pressing device that presses a material against the die face and the second pressing device that presses and bends the material. CONSTITUTION:When a material W is placed on the die face 5 and a slide 6 is lowered, pressing pins 9, 11 provided in an upper die 8 are also lowered, and pressing pin 9 comes into contact with the material W. At the same time, the material W is pressed and fixed on a lower die 4 by elasticity of a spring 10. Then, the pressing pin 11 comes into contact with the material W and goes down to bond the material W toward the lower die 4, and bites the material W to engage the groove 3a of a blank holder 3 with the bead 8a of the upper die 8. After coming into contact with the material W, the pressing pins 9, 11 go up relatively in the upper die 8 with descent of the upper die 8 and retreats inward from the forming face 8b at the bottom dead center of the slide 6. Drawing of the material W is completed at this point of time and specified shape is given to it. |
