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Pistons for cold chamber die casting machines

A cold chamber die-casting and piston technology, which is applied to the piston field of the press, can solve problems such as hindering the correct flow of metal

Active Publication Date: 2016-03-16
CPR SUISSE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] For example, it is known in some cases that, using the above-mentioned pistons, the metal that has solidified in the channel is not completely removed together with the metal riser but remains inside such a channel, thereby hindering the passage under the ring in subsequent cycles. The metal flows correctly

Method used

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  • Pistons for cold chamber die casting machines
  • Pistons for cold chamber die casting machines
  • Pistons for cold chamber die casting machines

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Embodiment Construction

[0030] Referring to the drawings, reference numeral 10 denotes a piston having a cylindrical body 11, preferably made of steel. The body 11 terminates at the front, ie on the side in the head 12 where the molten metal is pressed. The head 12 is defined by a front surface 13 which presses the molten metal. The front surface 13 may be flat or may be, for example, as in Figure 8 and Figure 9 The one shown in is convex to facilitate the release of the metal riser.

[0031] In a preferred embodiment, said body 11 is assembled (eg screwed) onto the stem 120 . The stem 120 terminates at the front with a peg 121 coupled to the body 11, for example by screwing. The column 121 and the interior of the body 11 define a cooling chamber 140 . The stem 120 is axially penetrated by a channel 122 capable of conveying a cooling liquid inside the chamber 140 .

[0032] Advantageously, the head 12 of the piston 10 has an axial opening 12' in which is inserted a copper washer 150 which con...

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Abstract

A piston for a cold chamber die casting machine comprising: a piston body terminating at the front with a front surface pushing molten metal; and at least one ring seat formed around the body, and Suitable to accommodate corresponding sealing rings. In the middle annular portion of the bottom surface of the ring seat is made an annular distribution channel which communicates with said front face of the piston through at least two communicating holes made in the piston body for the molten metal Flows below the ring into the distribution channel. The communication bore is inclined relative to the piston axis and has a through-section that increases towards the distribution channel.

Description

technical field [0001] The present invention relates to die casting machines, and in particular to pistons of presses for cold chamber die casting. Background technique [0002] In cold chamber die casting machines it is known to use injection pistons having a steel or copper body and at least one outer sealing ring fitted in a seat close to the piston head. [0003] An example of such a piston is described in US5233912. [0004] In WO2009125437 in the name of the applicant there is described a piston for a cold chamber die casting machine comprising: a body terminating at the front with a front surface extruding molten metal; and at least one sealing ring mounted around In the corresponding annular seat made of the body. At least part of the bottom surface of the seat is penetrated by at least two channels extending mainly in the longitudinal direction and protruding forward of the front surface of the piston for molten metal under the ring inflow. [0005] Preferably, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D17/20
CPCB22D17/203B22D17/2038F04B53/14
Inventor 基亚拉·斯基瓦洛基
Owner CPR SUISSE