Pengaruh Bentuk Saluran Turun (Sprue) Terhadap Cacat Porositas Dan Nilai Kekerasan pada Pengecoran Aluminium Menggunakan Metode Lost Foam Casting

Eko . Sriwahyudi, Bambang . Kusharjanta, Wahyu Purwo Raharjo


This study is aimed to determine the effect of cross-sectional shape of the sprue on porosity defect and hardness number of aluminum alloy castings using the lost foam casting process.

The raw material used in this study is derived from waste aluminum of bus pistons. Variations in cross-sectional shape sprue used are: circle, square, and triangle.The Porosity test conducted by comparing the true density with apparent density. The porosity testing using ASTM E-252 standart. The hardness number testing is conducted by using a Rockwell hardness testing machine with 1.59 mm of indenter steel diameter and 100 kg of test force.

The results showed that sprue with a square cross-sectional shape has lower average porosity percentage of 2.30% and higher average hardness values at 69.9 HRB Highest of porosity percentage values on sprue triangle at 4.93% and the lowest hardness value of 55.9 HRB


Keywords : Sprue shape, Aluminum Alloy, Porosity, Hardness

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Mekanika: Majalah Ilmiah Mekanika

ISSN: 1412-7962 || eISSN: 2579-3144

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