If the gas in the mold cavity is unable to be discharged normally and the pressure in the mold cavity rises to an unacceptable level during the die casting process, it will infiltrate the liquid metal and cause pores to form in the casting during the process. Preventing invasive air holes in zinc die casting is the most effective method of doing so.

The mold may be damaged during turnover and transportation even if the compactness of the sand mold is reasonable; however, this is not always the case. This gap can be used to expel gas that has accumulated in the mold cavity while it is being filled with concrete during the pouring process. A special open air hole is no longer required in the case of a mold that has a single plane running the length ofdie casting, which saves time and money. In order to facilitate slag removal and exhaust when the cavity is not compromised, it is recommended that the riser be set as high as possible in the cavity when the feeding effect does not become compromised.

It is critical that gas and slag be driven to and through the highest point in the cavity during the pouring of the liquid metal in order to ensure a smooth discharge from the open air port or riser. This causes the liquid level in the cavity to rise, which in turn causes the liquid level in the cavity to decrease.

When it comes to oxidation in aluminum alloy die cast parts, improper placement or leaving the die casting in place for an excessive amount of time are the most common causes.