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All Journal TEKNIK Journal of Energy, Mechanical, Material and Manufacturing Engineering
Djuanda, Dagus Resmana
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Engineering Mechanical Engineering

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EXPERIMENTAL STUDY ON MOLD-LAY FILAMENT INSTEAD OF WAX IN INVESTMENT CASTING PROCESS Kusyairi, Imam; Himawan, Helmy Mukti; Choiron, Moch. Agus; Irawan, Yudy Surya; Safari, Rachmat; Djuanda, Dagus Resmana
Journal of Energy, Mechanical, Material, and Manufacturing Engineering Vol 5, No 1 (2020)
Publisher : University of Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (736.278 KB) | DOI: 10.22219/jemmme.v5i1.10602

Abstract

Metal casting with investment casting method is metal casting which has the ability to produce accurate parts and has a controlled fineness. Current technological developments are very influential in the development of investment casting. One of them has been found mold-lay filament as a substitute for wax, which is now wax is one of the main components in investment casting process. Mold-lay filament is printed using a 3D Printer machine. In this study, the wax in the investment casting process was replaced by a mold-lay filament with the specifications 0.75kg / 0.55 lb of 1.75mm MOLDLAY filament, prints at temperatures of 170-180° C. The result show that mold-lay flutes are also able to come out well from slurry molds, but require more time than wax, this is because one of the plastic mold-lay compositions, which takes a long time for the moldlay fillment to come out of the mold. Further research suggestions are needed further testing in terms of roughness of the product with moldlay filament and compared with wax. This will also see if there are any remaining moldlay filaments from the mold.
Pengaruh Lapisan Dy & Tb pada Temperatur Rendah terhadap Koersivitas Magnet Permanen Tipe NdFeB Afrilinda, Eva; Virdhian, Shinta; Djuanda, Dagus Resmana; Doloksaribu, Martin
TEKNIK Vol 41, No. 2 (2020): August 2020
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v0i0.28857

Abstract

Pelapisan permukaan magnet dengan unsur tanah jarang berat (heavy rare earth element-HREE) diikuti difusi batas butir dapat meningkatkan koersivitas tanpa mempengaruhi remanen. Pada umumnya perlakuan panas dilakukan pada temperatur tinggi agar lapisan HRE dapat terdifusi ke dalam permukaan. Namun temperatur tinggi dapat meningkatkan ukuran butir sehingga koersivitas menurun. Penelitian ini mempelajari pengaruh lapisan Dy dan Tb pada temperatur rendah. Sampel magnet permanen dilapisi DyF3 dan TbF3 kemudian diberikan dua variasi perlakuan panas. Pertama, sampel diberikan perlakuan panas anil temperatur 700oC selama 6 jam lalu perlakuan setelah anil pada 500oC selama 1 jam. Kedua, sampel diberikan perlakuan panas anil temperatur 700oC selama 10 jam lalu perlakuan setelah anil pada 500oC selama 2 jam. Hasil uji koersivitas menunjukkan bahwa nilai koersivitas magnet permanen dengan Tb lebih besar dibandingkan dengan Dy pada waktu tahan 6 jam dan 10 jam. Pengamatan struktur mikro dengan SEM-EDS dan EPMA menunjukkan bahwa oksida terdifusi lebih dalam pada lapisan Tb dibandingkan lapisan Dy.
Co-Authors Eva Afrilinda, Eva Helmy Mukti Himawan, Helmy Mukti Imam Kusyairi, Imam Martin Doloksaribu, Martin Moch. Agus Choiron Safari, Rachmat shinta virdhian, shinta Yudy Surya Irawan