| 摘要 |
<p>A press for forming sheet material comprising an upper blank holder die element (1) and a lower blank holder element (1) capable of being brought into engagement for clamping a blank (7) between their respective clamping surfaces (5, 6); and a ram (3) for pressing a clamped blank, the clamping surface of the lower blank holder element being backed by a support block having volume of differing moduli of elasticity so that the resistance to compression of the clamping surface varies and the clamping force experienced by the blank when clamped between the die and the lower blank holder element also varies.</p> |
