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All Journal INTEK: Jurnal Penelitian Majalah Teknik Industri Jurnal Polimesin
Sonjaya, Muhammad Luthfi
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Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Pengaruh Energizer Kerang Dara, Kerang Hijau, dan Kerang Tiram terhadap Kekerasan Perkakas Potong HSS pada Proses Powder Nitriding Setyawan, Hendra; Jaman, Winda Sri; Sonjaya, Muhammad Luthfi; Alfarizi, Tito
Majalah Teknik Industri Vol 32 No 2 (2024): Majalah Teknik Industri
Publisher : Unit Penelitian dan Pengabdian Masyarakat (UPPM) Politeknik ATI Makassar

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Abstract

Perkakas potong dari High-Speed Steel (HSS) memiliki peran krusial dalam industri manufaktur, terutama dalam proses pemotongan dan pembentukan material. Kekerasan dan ketahanan aus dari perkakas potong sangat mempengaruhi efisiensi dan kualitas produksi. Proses nitriding adalah metode yang umum digunakan untuk meningkatkan sifat mekanik HSS, dengan tujuan meningkatkan kekerasan permukaan dan ketahanan aus melalui difusi nitrogen ke dalam material. Penelitian ini mengeksplorasi penggunaan bahan alami sebagai energizer dalam proses powder nitriding, khususnya cangkang kerang dara, kerang hijau, dan kerang tiram. Bahan-bahan ini kaya akan kalsium karbonat (CaCO3) dan mineral lain yang dapat memperkuat hasil nitriding. Sampel HSS tanpa perlakuan nitridasi memiliki kekerasan dasar 784,73 HVN, digunakan sebagai baseline untuk mengevaluasi efektivitas proses nitriding dengan energizer kerang. Hasil penelitian menunjukkan bahwa semua jenis kerang mampu meningkatkan kekerasan HSS, dengan cangkang kerang tiram memberikan peningkatan tertinggi hingga 71,6% (1346,47 HVN) pada suhu 600°C selama 3 jam. Kerang hijau menunjukkan stabilitas kekerasan yang baik di berbagai kondisi, sedangkan kerang dara mengalami penurunan kekerasan pada suhu tinggi, akibat over-diffusion nitrogen. Penelitian ini menyimpulkan bahwa pemanfaatan energizer cangkang kerang, terutama kerang tiram pada proses powder nitriding, dapat meningkatkan kekerasan HSS secara signifikan.
Implementasi Job Safety Analysis (JSA) untuk Meningkatkan Keselamatan Kerja dan Efisiensi Operasional dalam Pengolahan Limbah Sabut Kelapa di TPSA Bagendung, Kota Cilegon Alfarizi, Tito; Kurnia, Ganjar; Sonjaya, Muhammad Luthfi
Majalah Teknik Industri Vol 32 No 2 (2024): Majalah Teknik Industri
Publisher : Unit Penelitian dan Pengabdian Masyarakat (UPPM) Politeknik ATI Makassar

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Abstract

Penelitian ini mengevaluasi penerapan Analisis Keselamatan Kerja (Job Safety Analysis, JSA) untuk meningkatkan keselamatan kerja dalam proses pengolahan limbah sabut kelapa pada fasilitas pengolahan sampah Bahan Bakar Jumputan Padat (BBJP) di Tempat Pembuangan Sampah Akhir (TPSA) Bagendung, Kota Cilegon. Limbah sabut kelapa yang melimpah memiliki potensi untuk diolah menjadi produk bernilai tambah yakni bahan bakar pendamping batu bara atau co-firing yang dimanfaatkan untuk Pembangkit Listrik Tenaga Uap (PLTU) Suralaya. Dengan pendekatan kualitatif melalui observasi, wawancara dan studi dokumen, penelitian ini menganalisis peran JSA dalam mengidentifikasi bahaya, meningkatkan kesadaran situasional, dan mengoptimalkan efisiensi pengolahan limbah. Hasil yang didapatkan menunjukkan bahwa penerapan JSA efektif dalam memitigasi risiko kerja, meningkatkan partisipasi pekerja, dan meningkatkan kesadaran tentang implementasi keselamatan dan kesehatan kerja (K3). Studi ini merekomendasikan penerapan JSA secara konsisten untuk meningkatkan produktivitas dan meminimalkan risiko kecelakaan kerja dalam pengolahan limbah sabut kelapa di TPSA Bagendung.
Reducing Cycle Time in the Manufacturing Process of Circular Pattern Interpolar Products (CPIP) Using Special Fixtures on a 3-Axis CNC Machine Sonjaya, Muhammad Luthfi; Massaguni, Massriyady; Amaluddin, Muh. Nurul Haq
INTEK: Jurnal Penelitian Vol 10 No 2 (2023): October 2023
Publisher : Politeknik Negeri Ujung Pandang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31963/intek.v10i2.4439

Abstract

This research focuses on the design of fixture aids to support the manufacturing process of Circular Pattern Interpolation Products (CPIP), such as disk brake components, flanges, turbine disk runners, and other plate components with circular feeding patterns in the 3-Axis CNC machining process. The objective of this study is to achieve more efficient CPIP production times on 3-Axis CNC machines. The research methodology employed a design and build approach, involving the design of fixture aids, fabrication, and testing during the production of turbine disk runners on a 3-Axis CNC machine. This was done by comparing the initial workpiece setup time and the workpiece clamping transfer time using CPIP production aids versus not using CPIP production aids. The results showed that the designed CPIP Fixture significantly reduced the CPIP manufacturing Cycle Time, with a reduction of 63.11% in the initial workpiece setup time and 83.55% during the clamping transfer process.
Optimization of plunger geometry and stroke settings on hydraulic performance of diaphragm metering pumps Sonjaya, Muhammad Luthfi; Setyawan, Hendra; Ritonga, Jhordan; Sarifudin, Alfan; Nury, Dennis Farina
Jurnal Polimesin Vol 23, No 4 (2025): August
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i4.7308

Abstract

This study examines the influence of plunger diameter and stroke length on the performance of a hydraulic diaphragm metering pump, focusing on two key indicators: discharge pressure and flow rate. Experiments were conducted with five plunger diameters (7.90–9.00 mm) and three-stroke settings (100%, 75%, and 50%), validated in accordance with API 675 standards. Results show that each 1 mm increase in plunger diameter produced a consistent rise in flow rate across all stroke settings. Linear regression analysis revealed strong correlations, with flow rate increments of 67.54 mL/min per mm at 100% stroke, 60.78 mL/min per mm at 75% stroke, and 25.34 mL/min per mm at 50% stroke. High coefficients of determination (R²) confirm the robustness and predictive accuracy of these models. In addition to regression analysis, a two-way ANOVA was performed to statistically evaluate the effects of plunger diameter and stroke length, as well as their interaction, on pump performance. The ANOVA results confirmed that both parameters significantly affected flow rate (p 0.05), while discharge pressure was largely unaffected by stroke variation. The optimal configuration was achieved at a plunger diameter of 8.00 mm and 100% stroke, delivering performance that meets API 675 requirements. Importantly, this study proposes a novel validation framework for hydraulic diaphragm metering pumps based on API 675—a gap not fully addressed in prior research. These findings provide practical guidance for improving the efficiency and reliability of pump systems through optimized geometric and operational parameters.
Co-Authors Alfarizi, Tito Amaluddin, Muh. Nurul Haq Dennis Farina Nury Ganjar Kurnia Hendra Setyawan, Hendra Massaguni, Massriyady Ritonga, Jhordan Sarifudin, Alfan winda sri jaman, winda sri