| 摘要 |
<p>In an extrusion press (1) the volume between a pressure pad (4), a billet container (5), an extrusion die (6) and the billet (12) to be extruded is evacuated by suction through the pressure pad and a hollow extrusion stem (3) before the commencement of extrusion. Preferably the extrusion ram (2) is hollow and contains a vacuum reservoir (7) connected to this volume by a vacuum line (8) and valve (9). The vacuum line (8) may have a compressed air line (10) and valve (11) connected into it.</p> |
