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All Journal IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA)
Girsang, Evan Roland
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Automotive Engineering Energy Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Proses Pengecoran Logam Menggunakan Media Cetakan Plastisin Dengan Bahan Timah Sembiring, Perdy; Girsang, Evan Roland; Ginting, Dicka Prasetya; Hermanto, Tino
IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) Vol 3 No 2 (2024): Agustus
Publisher : CV. IRA PUBLISHING

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56862/irajtma.v3i2.117

Abstract

Metal casting is a manufacturing process that uses molten metal and molds to produce shapes that closely resemble the final geometry of a finished product. The molten metal is poured or pressed into a mold cavity that matches the desired shape or design. The objective of this research is to create a mold pattern using plastilin as a medium, identify the defects in the casting results, evaluate the advantages and disadvantages of using plastilin molds, and determine the shrinkage that occurs in the cast product. The research method applied in this metal casting process is the experimental method, where the mold is made from plastilin. The results show that the casting process led to several defects in the final product. The observed defects include porosity, a rough surface, and shrinkage. The porosity defects, characterized by small holes, were caused by trapped air during the pouring of the molten metal. The rough surface was due to the plastilin mold melting when the molten metal was poured into the mold. It can be concluded from this study that using plastilin as a mold medium is less effective, as the plastilin mold melts during the casting process, resulting in many casting defects. The pouring temperature affects the level of porosity in the casting, where higher pouring temperatures lead to increased porosity.
Pemanfaatan Tungku Berbahan Bakar Oli Bekas untuk Peleburan Aluminium Daur Ulang dan Kajian Mikrostruktur serta Kekerasan Pasca Quenching Aldori, Yopan Rahmad; Suprapto, Suprapto; Idris, Muhammad; Prayoga, Muhammad Angga; Girsang, Evan Roland
IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) Vol 4 No 3 (2025): Desember
Publisher : CV. IRA PUBLISHING

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56862/irajtma.v4i3.313

Abstract

This study investigates the use of a Waste-Oil-Fueled Furnace (WOFF) as an alternative heat source in the melting process of recycled Al-3004 aluminum. The melting was carried out using the sand casting method at a pouring temperature of approximately 730 °C, while measurements indicated the furnace could reach ±900 °C, exceeding the melting point of Al-3004 (±660 °C). The cast specimens were subsequently quenched in three media: water, oil, and air. Microstructural observations revealed that the cooling rate significantly affected crack formation: water quenching produced the largest cracks, oil quenching produced medium-sized cracks, and air cooling produced the finest cracks. Micro Vickers hardness testing supported these findings, showing significant differences in hardness values across the quenching media. Overall, the study confirms that the waste-oil-fueled furnace is an effective alternative energy-based metal-melting technology, while the choice of cooling medium plays a crucial role in controlling the material's microstructural features and mechanical properties.
Co-Authors Ginting, Dicka Prasetya Muhammad Idris Prayoga, Muhammad Angga Sembiring, Perdy Suprapto Suprapto Tino Hermanto Yopan Rahmad Aldori