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All Journal IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA)
Erwin Siahaan
Universitas Tarumanagara
Automotive Engineering Energy Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Pengaruh Laju Pemakanan Pada Proses Milling Baja SKD 61 Terhadap Keausan Pahat Endmill Karbida 2 Flute Arthasasta Sharon Rumbiak; Hardy Sari Putra; M. Sobron Yamin Lubis; Erwin Siahaan
IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) Vol 4 No 1 (2025): April
Publisher : CV. IRA PUBLISHING

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56862/irajtma.v4i1.189

Abstract

The metal-cutting process in manufacturing operations plays a crucial role in achieving a product's desired dimensions, sizes, and shapes; SKD 61 steel is widely used in the mold-making industry due to its excellent hardness properties. This study evaluates the effect of varying feed rates on tool wear during dry milling using a 2-flute carbide end mill cutter. A series of experimental tests were conducted using a manual milling machine to investigate the influence of feed rate variation on tool life. The feed rate variations used were 42 mm/min, 98 mm/min, and 230 mm/min. Other machining parameters were kept constant: spindle speed at 1320 rpm, cutting depth of 0.5 mm, and a tool diameter of 10 mm. The results showed that increasing the feed rate directly accelerated tool wear. The maximum tool wear, 0.6 mm, was reached at different times for each feed rate: 115 minutes (42 mm/min), 95 minutes (98 mm/min), and 80 minutes (230 mm/min). These findings provide valuable insights for optimizing cutting parameters to extend tool life and improve machining efficiency when working with SKD 61 steel components.
Analisis Pengaruh Kandungan Cobalt terhadap Densitas dan Kekerasan WC-Co Muhammad Sobron Yamin Lubis; Gerard Theodorus; Erwin Siahaan
IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) Vol 5 No 2 (2026): Agustus
Publisher : CV. IRA PUBLISHING

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56862/irajtma.v5i2.447

Abstract

This study investigates the effect of cobalt content and sintering temperature on the density and hardness of tungsten carbide cobalt materials produced using powder metallurgy. This research aims to analyze how binder content variation and sintering temperature affect the material's physical and mechanical properties. This study used an experimental approach with cobalt contents of 4%, 7%, and 10% and sintering temperatures of 1200°C, 1300°C, and 1400°C. The fabrication process included powder mixing, 24-hour ball milling, cold compaction, and sintering in an inert atmosphere. We measured density using Archimedes principle and hardness using the Vickers method. The results show that the maximum density was obtained at 10% cobalt content and a sintering temperature of 1300°C, while increasing the temperature to 1400°C decreased density due to grain growth and pore coarsening. Hardness increases with sintering temperature but has not reached the optimum value because of porosity and microstructure distribution. The results show that the combination of binder content and sintering temperature strongly determines the final properties of the material, with optimum conditions achieved at specific parameters that balance densification and microstructural stability.
Karakterisasi Komposit Polimer Berpenguat Serat Tebu Steven Winata; Erwin Siahaan; Abrar Riza
IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) Vol 5 No 2 (2026): Agustus
Publisher : CV. IRA PUBLISHING

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56862/irajtma.v5i2.486

Abstract

Using sugarcane fiber waste as composite reinforcement can reduce reliance on synthetic fibers, but performance depends strongly on fiber wetting, interfacial bonding, and matrix fraction. This study characterized sugarcane fiber-epoxy composites to determine the effects of three compositions on impact toughness and flexural strength. The fibers were treated with 5% NaOH for 4 h, oven-dried at 50°C for 12 h, aligned at 0°, and fabricated by hand lay-up using fiber-to-epoxy ratios of 50:50, 45:55, and 40:60. Each variation was tested in triplicate according to ASTM D6110 and ASTM D790. Data are reported as mean ± standard deviation and were explored using one-way ANOVA. The 40:60 composition produced the highest impact toughness (0.208 ± 0.003 J/mm²) and flexural strength (17.24 ± 0.75 MPa). Composition significantly affected impact (p = 0.0075) and flexural performance (p = 0.0005. The results indicate that a higher epoxy fraction improves fiber wetting and matrix continuity; however, interface optimization and void reduction are still required before the material can be used for highly loaded structural components.
Pengaruh Variasi Komposisi Serat Rami terhadap Sifat Mekanik Komposit Berbasis Resin Epoxy untuk Aplikasi Cover ECU Standar Yamaha YZF-155 Muhammad Calvine Ferdinand; Erwin Siahaan; Abrar Riza
IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) Vol 5 No 2 (2026): Agustus
Publisher : CV. IRA PUBLISHING

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56862/irajtma.v5i2.480

Abstract

This study aims to analyze the effect of variations in the composition of Ramie Fiber (Boehmeria nivea) and Epoxy Resin on the mechanical properties of composites for use as a standard Yamaha YZF-155 ECU Cover. The composites were fabricated using the Hand Lay-Up method with 5% NaOH threatment for 12 Hours. The Ramie Fiber and epoxy resin compositions were 50%:50%, 40%:60%, and 30%:70%. Testing was conducted using the Impact Test according to ASTM D6110 and the bending test according to ASTM D790. The results showed that the highest Impact toughness was 0.364 J/mm2 at a composition of 50%:50 %, while the highest bending strength was 17.77 N/mm2 at a composition of 40%:60 %. Based on these results, Ramie fiber-reinforced epoxy resin composites have the potential to be used as an alternative material for the Yamaha YZF-155 ECU Cover, offering adequate mechanical properties and environmental benefits.  
Co-Authors Abrar Riza Arthasasta Sharon Rumbiak Gerard Theodorus Hardy Sari Putra M. Sobron Yamin Lubis Muhammad Calvine Ferdinand Muhammad Sobron Yamin Lubis Steven Winata