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Politeknik Negeri Lhokseumawe Jl. Banda Aceh-Medan Km. 280,3, Buketrata, Mesjid Punteut, Blang Mangat, Kota Lhokseumawe, 24301 Aceh, Indonesia
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INDONESIA
Jurnal Polimesin
Published by Politeknik Negeri Lhokseumawe
ISSN : 16935462     EISSN : 25491199     DOI : http://dx.doi.org/10.30811/jpl
Core Subject : Science, Engineering,
Automotive Engineering Control & Systems Engineering Engineering Materials Science & Nanotechnology Mechanical Engineering
Mechanical Engineering - Energy Conversion Engineering - Material Engineering - Manufacturing Technology - Mechatronics - Machine and Mechanism Design - Biomechanics
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 503 Documents
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Efek perlakuan panas terhadap retakan pada bahan aisi 1045 Akhyar Ibrahim
Jurnal POLIMESIN Vol 8, No 1 (2010): Februari
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jp.v8i1.1306

Abstract

Baja SAE/AISI 1045 merupakan salah satu jenis baja karbon yang banyak dimanfaatkan untuk berbagai komponen dan konstruksi mesin. Namun demikian, dalam kondisi operasi dan konstruksi baja AISI 1045 seringkali terjadi kegagalan, akibat retakan yang timbul pada proses pengecoran, pabrikasi dan atau perlakuan panas. Karena itu, tujuan penelitian ini adalah untuk menemukan pengaruh hardening dan tempering terhadap kekerasan dan struktur mikro, dan retakan, Data penelitian ini dikumpulkan melalui studi kepustakaan dan uji laboratorium, kemudian dianalisis dengan menggunakan metode deskriptif Hasil penelitian menunjukkan bahwa (1) makin tinggi suhu pemanasan, makin tinggi harga kekerasan, (2) makin tinggi waktu penahanan, makin tinggi harga kekerasan, kecuali pada suhu 1000”C ketika waktu penahanan tinggi, harga kekerasan turun, (3) Hasil analisis struktur mikro dan makro menunjukkan bahwa makin tinggi suhu pemanasan makin tinggi retak guench, dan makin tinggi waktu penahanan makin tinggi juga retak guench. dengan jenis patah antar-batas-butir (intergranular), dan (4) makin tinggi suhu pemanasan makin tebal lapisan dekarburasi serelah hardening bahan tersebut.Kata kunci: AISI 1045, hardening, tempering, kekerasan, retak
Analysis of Temperature Distribution on the Coffee Roaster Drum for a Capacity of 2 kg Using Computational Fluid Dynamics (CFD) Dedi Suryadi; Benny Dwika Leonanda; Alfin Mustagfirin; Agus Suandi
Jurnal Polimesin Vol 22, No 1 (2024): February
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v22i1.4032

Abstract

Coffee, one of Indonesia's largest commodities, is often processed using traditional methods and tools that rely heavily on manual labor and can be labor-intensive. To make the coffee roasting process more efficient and reduce the need for human effort, a coffee roasting machine can be used. This study aimed to analyze coffee roasting drums using computational fluid dynamics (CFD) to determine the optimal drum thickness and rotation speed in a coffee roasting machine. The study considered three different thicknesses (1mm, 2mm, and 3mm) and three different rotation speeds (60rpm, 65rpm, and 70rpm). The coffee roasting drum was modeled using CFD. The study's results showed that a drum thickness of 2mm and a rotation speed of 70rpm achieved the best heat distribution during roasting, reaching the desired temperature in 900 seconds. This information could be used to design a more efficient coffee roasting machine or improve the performance of existing machines.
Analisis strategis kinerja industri kecil di pemko Lhokseumawe - Propinsi Aceh Ilyas Ilyas; Rudy Soenoko; Bambang Indrayadi
Jurnal POLIMESIN Vol 8, No 2 (2010): Agustus
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jop.v8i2.1364

Abstract

Penelitian ini bertujuan untuk menganalisa tipe dan karakteristik strategi untuk meningkatkan kinerja industri kecil di Pemko Lhokseumawe Nanggroe Aceh Darussalam. Dalam penelitian ini yang menjadi dasar analisis dalam tipe dan karakteristik strategi Miles dan Snow. Variabel dan indikator tipologi tersebut adalah : Prospector, dengan indikatornya adalah produk baru yang pertama, pemimpin pasar dan fleksibelitas. Defender, dengan indikatornya adalah produk yang terfokus, pasar yang terfokus dan efisiensi. Analyzer, indikatornya adalah produk yang berkesinambungan, penganalis pasar dan pengalis pesaing. Reactor, dengan indikatornya adalah produk yang sesuai dengan tekanan lingkungan, pasar sesuai dengan pesaing dan kurang baik dalam strategi persaingan .Jumlah sampel yang digunakan 160 responden. Hasil penelitian menunjukkan bahwa keempat tipologi strategi tersebut telah dijalankan oleh industri kecil di Pemko Lhokseumawe dengan perbandingan 30 responden menggunakan tipe strategi prospector, 67 responden menggunakan tipe strategi defender, 36 responden menggunakan tipe strategi analyzer, serta 27 responden menggunakan tipe strategi reactor.Kata kunci : tipe strategi, kesuksesan usaha, industri kecil, kinerja.
Efficiency Of Hydrogen Production From Sea Water Using The Electrolysis Process With Solar Energy Photovoltaic Systems Fadhli Fadhli; Lukman Hakim; Adi Setiawan; Rozanna Dewi; Zulnazri Zulnazri; Muhammad Daud; Ratna Sari
Jurnal Polimesin Vol 22, No 1 (2024): February
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v22i1.4824

Abstract

Hydrogen is a future alternative energy source, offering environmental friendliness and renewable properties that can potentially replace fossil fuels. Despite the potential, its synthesis typically requires high energy and costs, posing a constraint on mass production due to low efficiency. Therefore, this study aims to develop hydrogen production technology from seawater using the electrolysis process with solar energy from photovoltaic systems as energy source. The experiments were carried out with different voltages of 10, 15, 20, and 25 volts, using electrode materials made of titanium in mesh and plate shapes. Seawater served as the electrolyte, and it was supplemented with 0.1 molNaOH and 0.1 mol H2SO4. The results showed that the applied voltage had a positive correlation with hydrogen production rate, while the electrolysis process time had no significant effect. In addition, the use of NaOH catalyst with mesh-shaped titanium electrode could yield efficiency of hydrogen production flow rate of 2.06% or 52 ml/minute. This outcome was better compared to the electrolysis of seawater electrolyte with and without H2SO4 catalyst, which yielded values of 1.84% or 30.1 ml/minute and 1.42% or 28.9 ml/minute, respectively.
Experimental investigation of tool wear TiAlN(Al2O3)/TiN-coated carbide in the cam-shaft turning process arfan halim
Jurnal POLIMESIN Vol 20, No 2 (2022): August
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v20i2.2962

Abstract

This research carried out experimental tests to determine the tool life and wear of Titanium Aluminum Nitride and Titanium Nitride-coated carbide tools (TiAlN/Al2O3 TiN) during the hard facing process of cam shaft material turning. The results of this study will be used as a parameter for selecting carbide cutting tools in Teaching Factory (TEFA) activities. In the cutting process, the parameters used are VC = 36,74 m/min, f = 0,52 mm/rev, a = 0,2 mm, t = 460 min; and the cutting conditions are wet turning. The results showed that the TiAlN/ Al2O3-coated carbide tool experienced tool wear at the 100th minute with a VB value of 0,33 mm, while the TiN-coated carbide tool experienced tool wear at the 200th minute with a VB value of 0,30 mm. Theoretically, tool life for turning process conditions was analysed by graphical method in order to obtain the Taylor equation for TiAlN/Al2O3 coated carbide tools with an exponent value of n = 0,8 and a CT constant = 1.462,65 so that the Taylor tool life equation is V.Tn = CT ↔ V.T0,8 = 1.462,65. The results of the TiN carbide tool life test showed that the exponent n = 0,6 and CT constant = 882,59 so that the Taylor tool life equation is V.Tn = CT ↔ V.T0,6 = 882,59. Failure of TiAlN/Al2O3 and TiN-coated carbide tools on hard-processed cam shaft material cutting to face edge wear (VB), crater wear (KA), peeling of the tool material layer, and formation of built-up edge (BUE). The experimental test results of TiAlN/Al2O3 and TiN-coated carbide tools on the cutting of cam shaft material using a hard facing process show TiN carbide tools have a longer tool life than TiAlN/Al2O3, so they are recommended for Teaching Factory (TEFA) activities at Simas Berau Polytechnic
Design analysis of mold cavity and core on compression molding of composite material Muslimin Al Masta; Hasvienda M. Ridlwan; Dhiya Luqyana; Bayu Pambudi; Azam Milah Muhamad
Jurnal POLIMESIN Vol 21, No 2 (2023): April
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v21i2.3311

Abstract

This study discusses the design analysis of compression molding cavity and core under 12 tons of pressure and 100oC heat using experimental analysis and Ansys R19.2 simulation. This compression mold is used to process composite materials, mainly thermoset matrix composites. The compression product is a tensile test specimen according to the ASTM D638-4 standard. The main concern of this study aimed to analyze the stress distribution and deflection due to the compression load and heat on the cavity and core of compression molding. Hence, the die construction is safe during the operation under these loads. The analysis was carried out using Von Mises's stress of static loading criteria. The research parameter examined are stress distribution, deflection, and some critical dimensions in the cavity and core. These parameters significantly affect mold performance, product quality, and service life. Experimental analysis shows that the maximum deflection of the cavity and the core is 4.40 x10-4 mm and 1.53 x 10−4 mm, respectively. On the other hand, Simulation analysis shows the maximum deflection of the cavity and core is 4.56 x 10−4 mm and 7.41 x 10-5 mm, respectively. The error between experimental analysis and simulation is 6.87 x 10-5 mm and 3.32 x 10-5 mm for the cavity and the core, respectively. For stress analysis, the maximum value is 37.94 MPa for both cavity and core. On the other hand, simulation analysis shows 262 MPa and 256 MPa for the cavity and core, respectively. Both experimental analysis and simulation show that the result complies with the standard, less than 0,025 mm for deflection, and stress is less than 1034 MPa for maximum stress. Therefore, compression mold structure is safely used.
Analisa korosi pada heat exchanger e-4512 pt.arun ngl co Irwin Syahri Cebro; Sariyusda Sariyusda
Jurnal POLIMESIN Vol 1, No 1 (2003): Agustus
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jop.v1i1.1397

Abstract

Heat Exchanger E-4512 adalah salah satu alat penukar panas yang digunakan pada PT. Arun yang digunakan untuk mendinginkan atau menurunkan temperature MCR (multi component refrigerant) dengan media pendingin air laut. Pada heat Exchanger E-4512 ini terjadi kerusakan yaitu korosi terutama pada bagian-bagian seperti tube side, tube sheet, channel dan channel cover. Jenis korosi yang menyerang yaitu korosi sumur (pitting corrosion). Korosi erosi (erosion corrosion) dan korosi galvanis (galvani corrosion). Kerusakan ini akan berkaibat fatal mengingat fungsi dari Heat Exchanger merupakan pendukung utama proses produksi. Makalah ini menganalisa penyebab terjadinya korosi dan membahas hal-hal yang dapat dilakukan untuk mencegah terjadinya korosi berdasarkan kasus di lapangan dan kajian teoritis.
Optimization of CNC milling parameters using the response surface method for aluminum 6061 Arifin Indaka; Bagus Wahyudi
Jurnal Polimesin Vol 22, No 3 (2024): June
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v22i3.4909

Abstract

The manufacturing sector is constantly seeking ways to optimize the machining process, specifically for 3-axis CNC machines. This study aims to identify the optimal parameter values that result in the lowest roughness and the highest process capability in 3-axis CNC milling. The roughness level (Ra) of the product is primarily influenced by factors such as feed rate, spindle speed, and depth of cut. Additionally, the reliability of the machining process was analyzed to evaluate its ability to consistently achieve low roughness values and to validate the process capability of the VH850L3 series 3-axis CNC milling machine. The suggested approach for this analysis was the RSM central composite design method, which involved conducting experiments under various input conditions. The results indicated that the feed rate had the most significant impact on roughness, followed by the spindle speed, while the depth of cut had no effect. The parameters that resulted in the lowest roughness response were a spindle speed of 2589.76 rpm, a depth of cut of 0.159 mm, and a feed rate of 247.731 mm/min. These parameter values were tested on a 3-axis CNC machine, and the resulting data exhibited variations. Data processing revealed that the machine still performed optimally in the machining process, as indicated by the value of . However, the milling process deviates from the standard target, as the response value shows significant variation with a Cpk value 1.
Aplikasi dapur pemanas bagi pengrajin pandai besi untuk meningkatkan kualitas produk alat-alat perkakas Pertanian Saifuddin Saifuddin; Mohd. Arskadius A; Lukman Lukman
Jurnal POLIMESIN Vol 14, No 2 (2016): Agustus
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v14i2.338

Abstract

Penggunaan alat perkakas pertanian dan rumah tangga, terus meningkat dari tahun ke tahun, hal ini di karena berkembangnya lahan pertanian dan perkebunan baru di daerah Aceh. Fenomena ini berpengaruh signifikan terhadap permintaan dan pertumbuhan para pengrajin pandai besi di daerah Aceh, khususnya Aceh Utara. Kelompok Usaha Bersama (KUBE) Sejahtera yang selama ini menaungi beberapa pengrajin pandai besi di desa Pande, kecamatan Tanah Pasir, yang merupakan pemasok bahan baku dan juga sebagai pemasar hasil pengrajin baik di daerah Aceh Utara maupun luar Aceh mengalami permasalahan dimana selama ini yang dikeluhkan oleh konsumen adalah ketidakseragaman produk dan kualitas produk, terutama untuk peralatan pertanian, sehingga kalah bersaing dengan produk dari luar. Kondisi pengrajin pandai besi yang tidak memiliki pengetahuan teknologi dalam memilih material dasar dan proses sepuhan (heat treatment) yang hanya mengandalkan pada kebiasaan secara turun menurun sangat mempengaruhi pada produk akhir. Metode penyelesaian permasalahan ini di mulai dari pengenalan kualifikasi material baja, workshop, pembuatan dapur pemanas (furnace heater) dan implementasinya serta pelatihan managemen usaha. Tujuan dari kegiatan pengabdian kepada masyarakat dalam bentuk aplikasi dapur pemanas ini adalah untuk meningkatkan produktifitas, kualitas dan nilai jual (pemasaran) produk pengrajin ke penampung serta mudah digunakan dan perawatannya oleh masyarakat. Dapur pemanas yang telah dibuat dengan spesifikasi sebagai berikut: Dimensi: P x L x T = 600 x 4000 x400 mm, Media Pemanas yang digunakan gas Elpiji, penggerak: Blower Type Extrusi Fire. Kapasitas dapur dapat memuat 20 jenis peralatan sekali proses penyepuhan dalam jangka waktu 20 s/d 30 menit, dibandingkan dengan proses dapur tiup terbuka yang membutuhkan waktu 50 menit untuk satu produk, sehingga terjadi efisiensi dari segi waktu dan biaya produksi.Kata Kunci: Alat perkakas Pertanian, penyepuhan, managemen usaha, kualifikasi material.
Development of roller tank prototypes for moving goods with a capacity of 5 tons Heri Wibowo; Ardhias Mahendra P.; Aldho Jaya P.; Aldyth Gunanto P.; Bima Lantip B.
Jurnal POLIMESIN Vol 21, No 4 (2023): August
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v21i4.3774

Abstract

Transporting products is a common practice in many industries. To increase the effectiveness and efficiency of the transfer, assisting devices are utilized. The available goods movement equipment on the market is bulky and less adaptable for moving goods in confined spaces. The primary purpose of roller tanks is to aid and facilitate human labor in the process of moving products from one location to another in order to increase the effectiveness and efficiency of human labor. A roller tank facilitates the transportation of containers, industrial machinery, and other heavy equipment. The purpose of this roller tank's design is to discover: (1) the roller tank's design, (2) the manufacturing process for roller tanks, and (3) the performance test results for roller tanks. Requirements analysis, problem analysis and specifications, design, technical analysis, component fabrication, assembly, and tool testing are the methods used to construct this roller tank. The outcome of this roller tank design is a design with a functional drawing of a roller tank with dimensions of 280 mm in length, 150 mm in width, and 83 mm in height. The roller tank prototype is composed of ST 37 steel plate and low alloy carbon steel. The tank's drive wheel is made of nylon, and its two shaft bearings consist of a ball bearing 6804 ZZ and a roller thrust bearing 55105

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