| 摘要 |
<p>They apply to presses having multiple cylinders with combined fluid-dynamic actuating pistons for forcing the aluminium inside the die; the improvements are characterized in that the multiple cylinders comprise at least two coaxial chambers or cylinders (2,3) for the corresponding pistons (6,7), said pistons being arranged in tandem on a common shaft (5) which passes through both chambers (2,3) and which is connected by its protruding end (8) to the impeller actually forcing the aluminium inside the mould. They provide a pressure multiplier system of simple construction, small volume and high efficiency. <IMAGE></p> |
