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Tests of Mechanical and Thermal Deformation of Moulding Sands Produced in Various Technologies

Grabarczyk Aleksandra, Major-Gabryś Katarzyna, Jakubski Jarosław, Dobosz Stanisław Marian, Bolibruchová Dana, Pastirčák Richard

Archives of Metallurgy and Materials

2023

Vol. 68, iss. 3

933--937

Casting industry has been enriched with the processes of mechanization and automation in production. They offer both better working standards, faster and more accurate production, but also have begun to generate new opportunities for new foundry defects. This work discusses the disadvantages of processes that can occur, to a limited extend, in the technologies associated with mould assembly and during the initial stages of pouring. These defects will be described in detail in the further part of the paper and are mainly related to the quality of foundry cores, therefore the discussion of these issues will mainly concern core moulding sands. Four different types of moulding mixtures were used in the research, representing the most popular chemically bonded moulding sands used in foundry practise. The main focus of this article is the analysis of the influence of the binder type on mechanical and thermal deformation in moulding sands.

Quality of automotive sand casting with different wall thickness from progressive secondary alloy

Pastierovičová Lucia, Kuchariková Lenka, Tillová Eva, Chalupová Mária, Pastirčák Richard

Production Engineering Archives

2022

Vol. 28, Iss. 2

172--177

This paperwork is focused on the quality of AlSi6Cu4 casting with different wall thicknesses cast into the metal mold. Investigated are structural changes (the morphology, size, and distribution of structural components). The quantitative analysis is used to numerically evaluate the size and area fraction of structural parameters (α-phase, eutectic Si, intermetallic phases) between delivered experimental material and cast with different wall thicknesses. Additionally, the Brinell hardness is performed to obtain the mechanical property benefits of the thin-walled alloys. This research leads to the conclusion, that the AlSi6Cu4 alloy from metal mold has finer structural components, especially in small wall thicknesses, and thus has better mechanical properties (Brinell hardness). These secondary Al-castings have a high potential for use in the automotive industry, due to the thin thicknesses and thus lightweight of the construction.