Open Access Conference Proceedings

Computed tomography (CT) was used to evaluate the internal quality of the zinc alloy castings. The castings are produced by high pressure die casting process from ZP0430 zinc alloy, which contains also aluminium and copper. High pressure die casting process is very complicated and sensitive to casting parameters such as filling rate, solidification time, die tempering and others. A certain percentage of porosity is always present in the castings. As part of the research into the die casting process, the internal porosity of Langmutter castings produced in an eight-cavity die was investigated. Castings produced using normal casting parameters and modified casting parameters based on numerical simulation of the casting process were evaluated. Computed tomography was used to determine the distribution of cavities in the casting, their quantity and subsequently their volume and porosity. In the castings produced using the normal casting parameters, the average number of cavities was 679 and the porosity was 0.108 %. When the modified casting parameters were implemented, the average number of cavities in the castings decreased to 454 and the porosity to 0.077 %. It has been shown that the modified casting parameters are more suitable for the high pressure die casting process in terms of porosity formation.

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