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All Journal AUSTENIT Jurnal Inovator MACHINERY: Jurnal Teknologi Terapan
Tafrant, Dodi
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Automotive Engineering Control & Systems Engineering Energy Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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KEKERASAN DAN STRUKTUR MIKRO BAJA AISI 1040 SEBAGAI HASIL PROSES QUENCHING MENGGUNAKAN PENDINGIN AIR GARAM DAN ASAP CAIR Tafrant, Dodi; Hendradinata, Hendradinata; Mulyadi, Mulyadi; Sampurno, Rachmat Dwi; Sani, Almadora A.; Karmin, Karmin; Hidayat, Randy; Muzafar, M. Agil; Fitriani, Devita Dinda
MACHINERY Jurnal Teknologi Terapan Vol. 3 No. 2 (2022): Machinery: Jurnal Teknologi Terapan
Publisher : Politeknik Negeri Sriwijaya, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5281/zenodo.6857629

Abstract

Steel with various uses has an important role in machining and construction processes. In its use, steel is chosen because of its strength, ductility, and hardness. One type of steel commonly used in the machining process is AISI 1040 steel. This is because AISI 1040 steel has tough, strong, and hard properties. However, in its use sometimes AISI 1040 steel must be hardened to be more capable in its use. In that endeavor, AISI 1040 steel can be subjected to heat treatment to change its microstructure from initially Ferrite and Pearlite, to Martensite. This change in microstructure has an effect on increasing the hardness value of AISI 1040 steel. This study was conducted to determine how much effect the increase in hardness value would have if AISI 1040 steel was subjected quenching using brine and liquid smoke as cooling media. The results obtained were an increase in the hardness value of AISI 1040 steel to 63.76 HRc, and 65.40 HRc for each cooling medium. The visible microstructure is the formation of a martensitic phase on AISI 1040 steel after heat treatment.
PENGARUH VARIASI MATERIAL MATA PAHAT ENDMILL TERHADAP KEKASARAN PERMUKAAN RESIN PADA CNC ROUTER 3018 Andhika, Muhammad; Ismail, Iskandar; Sani, Almadora Anwar; Tafrant, Dodi
MACHINERY Jurnal Teknologi Terapan Vol. 4 No. 2 (2023): Machinery: Jurnal Teknologi Terapan
Publisher : Politeknik Negeri Sriwijaya, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5281/zenodo.8049203

Abstract

The purpose of this study is to find out what chisel is the best for cutting acrylic resin and evaluate which one is the best, which can be seen from the surface roughness value obtained through the cutting process. The workpiece materials used in this study are acrylic resins and various types of chisels, namely HSS, carbide and tungsten, Because the chisel has different characteristic properties, so it can be used as a comparison. For the next process, the workpiece is fed three times with a spindle kec of 1000 rpm and a cut kec of 400 mm / minute and a feeding depth of 0.5 mm. It can be concluded that the surface roughness data of the workpiece, the value of the surface roughness of the workpiece of acrylic resin is averaged from the smoothest to the roughest, namely HSS, tungsten chisel, and the roughest carbide. The average roughness value of the HSS chisel is 0.751 μm and the average roughness value of the tungsten chisel is 1.578 μm and the roughness value of the carbide chisel is 1.768 μm.
Analisis Pengaruh Persentase Campuran Resin dan Katalis Terhadap Ketahanan Korosi Pada Pelapisan Material Poros ST 37 Tafrant, Dodi; Rasid, Muhammad; Alimedi, Alimedi; Safei, Safei; Sampurno, Rachmat Dwi
Jurnal INOVATOR Vol. 7 No. 1 (2024): Jurnal INOVATOR
Publisher : LPPM Politeknik Jambi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37338/inovator.v7i1.291

Abstract

Secara umum, resin memiliki kegunaan sebagai agen perekat untuk material-material tertentu. Resin sendiri merupakan suatu campuran likuid yang terdiri dari beragam senyawa kompleks seperti alkohol, asam resinat, dan ester resnotannol. Menurut Kuspradini (2016), resin dapat ditemukan secara alami maupun dibuat secara sintetis, dan memiliki sifat-sifat seperti padat, transparan dengan sedikit kekeruhan, berkilauan, mudah terbakar, dan cenderung meleleh saat terpapar panas. Penggunaan resin sering kali digunakan untuk mengatasi proses korosi pada logam dengan menerapkan metode pelapisan. Proses pengeringan resin, terutama dalam campuran dengan katalis, memengaruhi waktu pengerasan dan kemampuan perekat resin pada material logam yang diuji. Penelitian ini bertujuan untuk mengurangi korosi pada material poros dengan menggunakan campuran resin dan katalis dengan perbandingan 1:15 dan 1:20. Proses pengujian korosi dilakukan dengan merendam spesimen uji dalam larutan air garam 3,5% selama 40 hari. Berat spesimen uji sebelum dan sesudah proses korosi akan diukur menggunakan timbangan digital. Hasil penelitian menunjukkan bahwa campuran resin dan katalis dengan perbandingan 1:15 menghasilkan tingkat laju korosi yang lebih rendah daripada bahan mentah (row material) dan campuran resin dan katalis dengan perbandingan 1:20. Terjadi penurunan laju korosi sebesar 0,9114 x 10^-6 gr/menit pada campuran dengan perbandingan 1:15, sementara pada campuran resin 1:20, terdapat kecenderungan peningkatan laju korosi.
ANALISA PENGARUH KEMIRINGAN SUDUT SCREW EXTRUDER PADA PROSES PEMBUATAN FILAMENT 3D PRINTER PADA MESIN EKSTRUSI SINGLE SCREW Rasid, Muhammad Rasid; Suparjo, Suparjo; Tafrant, Dodi; Homzah, Ozkar F.; Ma’arif, Syamsul
AUSTENIT Vol. 14 No. 1 (2022): AUSTENIT: April 2022
Publisher : Politeknik Negeri Sriwijaya, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53893/austenit.v14i1.4445

Abstract

The purpose of this research is to calculate the effect of the screw extruder angle on the results of 3-dimensional printer filaments that are printed using a single screw extrusion machine. The machine parameters used in this study were: pull speed 16 rpm, extrusion speed 28 rpm, extrusion mold diameter of 2 mm, and temperature of 180oC. The material used is recycled HDPE plastic. While the tilt angle of the screw in the research conducted by providing 5 variants of the angle of inclination (0o, 10o, 15o, 20o, 25o) where the diameter of the screw shaft used is the same. Data analysis was carried out using a simple linear regression method. Where the results obtained were: 1) the smallest filament diameter was 0.9 mm when using a screw with an angle of 0o, and 2) the highest diameter was 1.86 mm when using a screw with an angle of 25º. The conclusion obtained is that the tilt angle of the helical screw affects the results of recycled HDPE plastic extrusions, where the effect of the screw angle tilt is directly proportional to the filament diameter. In other words, with the addition of the tilt angle of the screw, the diameter of the resulting filament will also increase. In addition, based on the results of measuring the diameter of the filament, the conclusion that can be drawn is that with the increase in the diameter of the extrusion result, the outflow obtained will also be greater.
Co-Authors Alimedi, Alimedi Andhika, Muhammad Fitriani, Devita Dinda Hendradinata, Hendradinata Hidayat, Randy Ismail, Iskandar Karmin Karmin, Karmin Ma’arif, Syamsul Mulyadi Mulyadi Muzafar, M. Agil Ozkar F. Homzah, Ozkar F. Rasid, Muhammad Rasid, Muhammad Rasid Safei Safei Sampurno, Rachmat Dwi Sani, Almadora A. Sani, Almadora Anwar Suparjo