| 摘要 |
<p>This device having dies comprises an upper die 1 capable of penetrating into a skirt-shaped part of a metal cap, a lower die 2 comprising a forming surface 2a which can contact the lateral external surfaces of the skirt-shaped part and a cavity of the metal cap, and a hole 2b for receiving a die, a die 3 for forming a cavity, inserted into the die-reception hole and comprising a radial recess 3b and an oblique forging surface 3a forming the cavity of the metal cap by bending the wall element of a metal block, and a die 4 for forming an opening, inserted in a movable manner into the radial recess. Application especially to the manufacture of suspension insulators for overhead power-supply lines. <IMAGE></p> |
