Abstract
The main problem during the production of castings from aluminium alloys is the presence of the reoxidation, which negatively affects the final casting quality. Liquid metal surface reacts with the surrounding atmosphere and oxide layer of Al2O3 is formed on its surface. The problem occurs when the oxide layer is entrained to the internal volume of the melt by turbulence and double oxide layers are formed, also known as “bifilms”. Its formation is related to the melt velocity and gating system design. In paper, naturally pressurized gating system was calculated and designed. Effect of the filter media and vortex element on the melt velocity, amount of oxides, mechanical properties, and porosity were observed. Designs with 10 ppi and 20 ppi foam filters and vortex element were compared with design without filters to prove the positive (or negative) effect of filter media on melt velocity and thus on final casting quality. The melt velocity and amount of oxides were observed with the aid of simulation software. Mechanical properties, quantity of pores, bifilm index and EDX analysis were evaluated after experimental casts. It was proven that by using 20 ppi foam filter in combination with vortex element, the best results were achieved.
Highlights
Aluminium alloys are an important group of materials and their usage in the automotive and aerospace industry is still increasing
For each gating system design, the samples were taken from castings for a tensile test
Tensile tests were performed on the Tira Test 2300 testing device, average elongation was determined for each design of gating system
Summary
Aluminium alloys are an important group of materials and their usage in the automotive and aerospace industry is still increasing. It is due to their suitable combination of mechanical properties and a wide range of usage, because aluminium alloys have high ratio of strength to weight, corrosion resistance, low melting point, good casting and thermal properties and especially light weight overall [1,2,3,4,5]. The use of aluminium alloys in the automotive and aerospace industry is related to increasing demands of casting quality. It leads to elimination as many casting defects as possible [6]. Possibility how to produce reliable castings is to follow the 10 rules for good castings by John Campbell [6,7]
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