Available in three sizes, Die Cast Chill Vents are often used with permanent molds for die casting light metals such as Aluminum or Magnesium. The chill vent functions as a means of efficiently exhausting residual air and/or gas from the inside to the outside of a die cast mold cavity.
Chill vents minimize the spouting of molten metal and reduce flashing when charging molten metal into the die cavity. If residual air and/or gas remain in the die cavity, the result may be gas holes in the casting that degrade product quality.
Gas exhaust passage design is generally shaped in a zigzag manner to ensure that after the gas has been exhausted outside of the chill vent, the molten metal will be chilled in the zigzag passage before it is flashed outside of the permanent mold. However, since molten metal flows under high pressure, it is difficult to completely prevent flashing even by increasing the length of the chill vent.
Chill vents provide superior thermal conductivity (as compared to the tool steels used in Die Cast molds) to rapidly remove heat from non-solidified molten metal, thereby minimize flashing around the chill vent. To achieve this level of performance, Beryllium Copper alloy is used in the construction of each Chill Vent, and provides both the hardness and thermal conductive properties required for use as a chill vent in Aluminum and/or Magnesium die casting. Beryllium Copper alloy has the additional benefit of casing passive-state oxide film to be formed on the surface of the chill vent, thereby preventing dissolution of light metal alloys. These factors provide an effective means of exhausting air and gases outside of the mold without being dissolved while chilling the molten metal before flashing occurs.
It is important to note that precautions must be taken when machining or modifying Beryllium Copper alloy. Please read the DME Chill Vents packing slip as well as the DME Chill Vent MSDS Data before handling, working with, or using a DME Chill Vent.
For questions on Die Cast mold design methodology, please refer to the NADCA website for more info
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