| 摘要 |
<p>A piston for cold chamber die-casting machines, comprises a piston body terminating at the front with a frontal surface pushing the molten metal and at least one ring seat made around said body suitable to house a respective sealing ring. An annular distribution channel is made in an intermediate annular portion of the bottom surface of the ring seat, which communicates with said frontal surface of the piston through at least two communication holes made in the piston body for a flow of molten metal into the distribution channel, under the ring. Said communication holes being inclined in relation to the piston axis and having a through section which increases towards the distribution channel.</p> |
