A blowhole refers to a cavity caught inside the die cast product.

Die casting is a manufacturing process in which molten metal is forced into the mold cavity of a die and then solidifies. During this process, (1) shrinkage pores or defects can occur due to parts in the casting where solidification is delayed, or (2) blowholes can occur which are caused by air bubbles that are entrapped in the melt and are not discharged during solidification.

Generally, when a blowhole occurs, impregnation treatment can fill up or close off unwanted or unnecessary cavities. However, this treatment can lead to future problems with pressure leaks or fluid leaks, in critical parts and pressure parts.

This is a common problem with high-pressure castings worldwide, and requires experience and knowledge to tackle in many cases. At Akiba Die Casting we have over 50 years experience with high-pressure aluminum and zinc die castings as well as state flow analysis software to tackle any problems that may crop up.