Jurnal Mesin Nusantara

The Effect of Selecting a Saw Blade on the Cutting Process in the Fabrication of 2-G-(F)-750 Iron Girders

Galih Haryudwitomo, Nanang Burhan, Deri Teguh Santoso — Fri, 28 Jun 2024 00:00:00 +0700

In the fabrication process of a series of piperacks, accurate workpiece results are needed in a fast time, therefore procedures are needed that can support the speed and accuracy of fabrication to fulfill PT Pertamina's wishes so that the RDMP RU V Balikpapan project takes place quickly. One part of the piperack fabricated by PT Arkha Jayanti Persada is iron girders. Because the process of checking the quality of parts of the piperack series is carried out by PT Pertamina very strictly, the results of the fabricated iron girders are also required to obtain precision iron girders at the right time but not injuring the tools and machines owned by PT Arkha Jayanti Persada. The purpose of this study is to analyze the results of 4 different blades. From the research results, it was found that cutting the 2-G-(F)-750 girder took 119 minutes using a saw blade 41 x 1.3 x 5300 – 10 TPI. With the same blade speed, replacing the saw blade with a 14 TPI tooth profile speeds up the cutting time to 85 minutes (29 %).

Spot Welding Error Analysis in Making Rear Brake Arm in Spot Welding Part at PT. XYZ

Magada Nandika Adicakra, Deri Teguh Santoso — Fri, 28 Jun 2024 00:00:00 +0700

As a manufacturing company engaged in the manufacture of automotive parts, it produces components for motorized vehicles, especially for two wheels, with the production of spare parts in the form of arm rear brakes. In the manufacture of these spare parts, it is really necessary to pay attention to all the needs, such as materials which, in other words, really have an influence on the strength of the material. Included in the process that goes through spot welding, it needs to be considered in the stages of the process to be optimal because, if not, it will cause failure of a product so that defective products are obtained at this welding point. Improvement of the production process of this product can be done by identifying control factors and arrangements using the 5 why analysis, fishbone, and pareto methods until the production process is stable and the results obtained are good and according to the expected standards until the needs of all parties are met.

Proses Produksi Gasket pada Mesin Press Aida DSF-C1800A di PT. XYZ

Nurul Arifin, Deri Teguh Santoso, Aa Santosa — Fri, 28 Jun 2024 00:00:00 +0700

Salah satu sektor terpenting yang memberikan kontribusi signifikan terhadap perekonomian nasional adalah industri otomotif. Besar gaya pemotongan yang diperlukan agar pukulan mampu menembus material disebut gaya potong. Tujuan utama menghitung gaya potong proses pemotongan adalah untuk menentukan kekuatan tekan selama proses produksi. Dengan asumsi mengabaikan penolakan produksi, hasil produksi mampu mencapai 133,9 pcs dalam satu jam produksi. Data yang digunakan diambil selama bulan Agustus yaitu sekitar 1.440 jam kerja. Dihitung dengan membagi total produksi dengan waktu proses yang dibutuhkan. Oleh karena itu, mesin press menghasilkan gaya potong sebesar 80.000 N. Proses balnking dan piercing adalah dua tahap dalam proses produksi gasket, yang ditentukan oleh hasil diskusi dan pengolahan data. Bahan yang terbuat dari Stainless Steel. Temuan solusi atas permasalahan yang muncul selama proses produksi dengan melakukan evaluasi secara berkala.

Mengoptimalkan Analisis Sifat Mekanik Material Berbasis Data Dengan Pandas Profiling

Fri, 28 Jun 2024 00:00:00 +0700

The analysis of mechanical properties based on data is a method used to analyze the mechanical properties of a material using data, typically obtained from a material database. This process encounters several challenges, such as large volume of data, complexity in data processing, as well as difficulties in data visualization and interpretation. In this study, Pandas Profiling, a Python library designed specifically for automated dataset analysis, was employed. The dataset used consisted of tensile test results for various austenitic stainless steel types such as SUS 304, SUS 316, SUS 321, SUS 347, and NCF 800H. This dataset comprised 1916 samples with attributes related to mechanical properties and factors influencing them. The analysis results using Pandas Profiling indicated a strong negative correlation between heat treatment temperature and Yield Strength (YS) and Ultimate Tensile Strength (UTS). Additionally, a positive correlation was found between chemical elements such as Copper (Cu) and Nickel (Ni) with Elongation (EL). Furthermore, the analysis results revealed that stainless steel treated with water cooling exhibited a higher average UTS value, measuring at 493 MPa, compared to air cooling, which only reached 403 MPa. Pandas Profiling offers an effective solution to overcome common challenges in data-based mechanical property analysis, including dealing with large data volumes, complex data processing, as well as challenges in data visualization and interpretation. By utilizing Pandas Profiling, researchers can easily comprehend the dataset comprehensively, identify patterns, trends, and relationships among variables, and optimize the analysis process of data-based material mechanical properties.

Efficiency of Boiler and Steam Turbine for Power Plant Unit 2 PT. XYZ

Husni Mubarak, Mahmuddin Mahmuddin, Sungkono Sungkono, Muhammad Arham — Wed, 12 Jun 2024 00:00:00 +0700

PT. XYZ has an electric power capacity of 70 MW and began operating in 2014 during its operation there has been a decrease in power from 35 MW at the time of commissioning to 32 MW. This study investigates the impact of the air-fuel ratio (AFR) on the efficiency of a thermal system, focusing on the boiler, turbine, and overall thermal cycle efficiency. Variations in excess O2 in flue gas were examined at levels of 5.0%, 5.5%, and 6.0%. The results reveal that the boiler efficiency peaks at 5.0% excess O2 (73.50%), while an increase in excess O2 or AFR leads to a decrease in efficiency. Turbine efficiency remains relatively stable (74-76%) despite a slight decline with increased AFR. The thermal cycle efficiency reaches its maximum at an AFR of 13.61 (45.60%) but diminishes at higher AFR values.

Karakterisasi Tebal Lapisan Dan Ketahanan Korosi Mild Steel SS400 JIS G3101 Dengan Metode Elektroplating Ni-Cr

Fri, 28 Jun 2024 00:00:00 +0700

Mild steel is steel with a concentration of carbon element below 0.3%. In its use as an oil storage tank material on fuel transport trucks, there is a problem, namely its resistance to corrosion in fuel. Sulfur compounds in fuel have a role in the formation of corrosion. Currently, the Ni-Cr electroplating coating method is very widely used as an effort to control the corrosion rate of carbon steel. The use of Ni-Cr as an anode is relied upon as a substance resistant to corrosion. Therefore, the purpose of this study was to identify how layer thickness affects corrosion levels in SS400 mild steel based on current variations and duration of the electroplating process. In this study using mild steel SS400 JIS G3101 with electroplating method (electroplating) varying the electric current 1A, 2A and 3A, as well as electroplating time of 10 minutes, 20 minutes and 30 minutes. The test parameters of the electroplating results are the actual layer thickness test, theoretical thickness test and corrosion rate test. Data processing was analyzed using two-way variance analysis. The thickness of the layer increases with increasing electric current and the length of time of Ni-Cr electroplating. The highest thickness value of 102.34 μm using a digital microscope while for theoretical testing of 98.33 μm, both were obtained at a current variation of 3A and an electroplating time of 30 minutes. The trend of corrosion rate value will decrease with the increase in electric current and the length of electroplating time with the lowest value of 0.003359 mmpy at a variation of electric current 3A and electroplating time of 30 minutes. For optimal values with the lowest corrosion rate on mild steel SS400 JIS G3101 as an oil storage tank material on fuel transport trucks, it is obtained by using a current of 3A and an electroplating time of 30 minutes Ni-Cr.

Smart Machinery Monitoring System berbasis Mobile Application

Gun Gun Maulana, Siti Aminah, Fikri Abdul Rahman — Fri, 28 Jun 2024 00:00:00 +0700

This research designs and implements a Mobile Application-Based Smart Machinery Monitoring System as a solution for monitoring machine conditions in industrial environments. Using Flutter as a mobile application development framework and utilizing internet connection capabilities, this research aims to increase monitoring efficiency and minimize the risk of machine failure. With a responsive interface, this application allows real-time access to machine conditions from various mobile devices. Internet of Things (IoT) integration allows machine sensors to communicate with applications, providing accurate and direct data. This research is expected to make a positive contribution to industrial operational efficiency, make it easier for users to monitor machine conditions, and support the industry's evolution towards an era of better connectivity.

Pengaruh Variasi Pembebanan Terhadap Performansi Mesin Diesel Single-Fuel Berbahan Bakar Dexlite dan Liquified Petroleum Gas

Andinusa Rahmandhika — Fri, 28 Jun 2024 00:00:00 +0700

Liquified Petroleum Gas (LPG) is an environmentally friendly alternative fuel, it would be a shame if it were not utilized. By making modifications to the diesel engine, it turns out that LPG can be used as a substitute for fuel oil. This research aims to determine the performance of a single-fuel diesel engine using Dexlite and 3 kg LPG. The method in this research is experimental research. Data was taken three times in each experiment with different load variations, then processed to obtain values for engine speed, torque, power, SFC and thermal efficiency. The research results show that the maximum torque value for dexlite and LPG is 22.4375 N.m. The maximum power value for dexlite and LPG is 3.9924 kW. The minimum SFC value for dexlite is 1.3089 kg/kW.hour while LPG is 0.9481 kg/kW.hour. The maximum thermal efficiency value for dexlite is 64.03% while for LPG it is 80.8%. The results of this research show that the torque and power values for each fuel have the same value, this is because the engine speed and load are the same. However, the SFC value and thermal efficiency of each fuel have different values, where the SFC value of 3 kg LPG is lower than Dexlite and the thermal efficiency value of 3 kg LPG is higher than Dexlite.

Pengaruh Penambahan Pigmen Warna pada Filamen PLA SUNLU Colors dan SUNLU Natural

Noesanto Dewantoro Ahmad, Sukamto Sukamto, Bagas Risda Pratama — Fri, 28 Jun 2024 00:00:00 +0700

3DP technology is experiencing rapid development and is widely used in various fields. PLA material is widely used as a material for making filaments used in 3D printing (3DP). PLA filament in 3DP is widely used because it has many advantages, including biocompatible, biodegradable, and non-toxic. When compared with other filament materials, PLA material is easier and safer to use because the temperature used is relatively lower so it is more energy efficient compared to other filament materials. SUNLU is a well-known manufacturer that provides various types of quality filaments, including PLA Colors and PLA Natural, where each type of SUNLU PLA filament has its characteristics and advantages. The choice of PLA filament type is adjusted to the desired printing needs, including the desired color and visual effect. The use of color pigments in PLA filaments with various color choices is used to produce objects that are more attractive and more flexible in their use in various fields. This experimental research was carried out to determine the effect of adding color pigments to SUNLU PLA Colors and SUNLU PLA Natural 1.75 mm filament samples with predetermined sample manufacturing variables. This research uses the ASTM D638 type V standard tensile test so that the tensile strength value of each sample can be determined and the maximum value from the tensile test can be determined. The results of this research will show a comparison of the tensile strength between SUNLU PLA Colors filament samples and SUNLU PLA Natural 1.75 mm. The tensile test results of the SUNLU PLA Natural sample had a higher value, namely 53.98 MPa, and for the SUNLU PLA Colors Orange and Gray samples, each had a tensile strength value of 46.58 MPa and 46.63 MPa. These results show that adding color pigments to the filament affects the strength of the resulting 3D-printed samples

Pengaruh Komposisi Pasir Kuarsa Terhadap Sifat Bata Tahan Api (Firebrick) Berbahan Kaolin Dan Fly Ash

Dwi Handoko, Pujarianto Pujarianto — Fri, 28 Jun 2024 00:00:00 +0700

Penelitian ini bertujuan untuk mengetahui pengaruh komposisi pasir kuarsa pada pembuatan bata tahan api berbahan dasar kaolin dan fly ash. Kaolin merupakan bahan keramik yang memiliki kekuatan tinggi apabila dibakar pada suhu tinggi dan fly ash merupakan produk limbah dari pembakaran boiler. Unsur-unsur yang terkandung dalam fly ash adalah alumina (Al2O3), oksida besi (Fe2O3), silika (SiO2) dan kalsium, sulfur, dan magnesium karbon. Pasir kuarsa berfungsi sebagai bahan pengisi yang dapat meningkatkan kekerasan batu bata tahan api sekaligus meningkatkan ketahanan terhadap temperatur tinggi. Metode penelitian yang digunakan adalah metode eksperimen dengan membuat benda uji yang komposisinya bervariasi yaitu kaolin, fly ash dan pasir kuarsa dengan air yang konstan. Komposisi yang digunakan untuk kaolin dan fly ash diberi perbandingan persentase yang sama, dengan memvariasikan pasir kuarsa sebesar 0 (%), 10 (%), 15 (%), 20 (%), 30 (%). Pengujian yang dilakukan adalah uji massa jenis, konduktivitas panas, kuat tekan pada batu bata yang telah dipanaskan hingga suhu 1275°C, dimana hasil tersebut akan menjadi parameter untuk mengetahui komposisi terbaik. Hasilnya adalah dengan menambah komposisi pasir kuarsa terjadi peningkatan nilai densitas dan konduktivitas panas, sedangkan kuat tekan maksimum terjadi pada penambahan pasir kuarsa 10% yaitu sebesar 30,51 MPa

Pengaruh Media Pendingin Post–Weld Heat Treatment (PWHT) Terhadap Karakteristik Mekanik dan Struktur Mikro Baja Karbon Hasil Pengelasan Shielded Metal Arc Welding (SMAW)

Zuldesmi Mansjur, Moh. Fachruddin Suharto — Fri, 28 Jun 2024 00:00:00 +0700

Post-Weld Heat Treatment (PWHT) selain berfungsi untuk menghilangkan tegangan sisa, juga untuk meningkatkan ketangguhan sambungan di daerah pengaruh panas/Heat Affected Zone (HAZ) dan memperbaiki butir-butir kristal suatu material. Parameter PWHT (waktu, temperatur dan media pendingin) sangat mempengaruhi peningkatan karakteristik mekanik dari material las, seperti: kekerasan, kekuatan tarik, keuletan, ketangguhan dan lain sebagainya. Penelitian ini bertujuan untuk mengetahui pengaruh media pendingin terhadap sifat mekanik (kekerasan dan kekutan tarik) dan struktur mikro baja karbon rendah ST42 hasil pengelasan SMAW. PWHT dilakukan pada temperatur 800 °C dengan tiga variasi media pendingin yaitu: air, udara, dan tungku. Hasil penelitian yang didapat adalah nilai kekerasan dan kekuatan tarik baja ST42 hasil pengelasan SMAW menjadi turun setelah dilakukan proses PWHT, namun elongation meningkat setelah PWHT. Diantara ketiga variasi media pendingin PWHT (air, udara dan tungku), nilai kekerasan dan kekuatan tertinggi dihasilkan pada baja las ST42dengan media pendingin air. Struktur mikro baja las S45C terdiri atas fasa ferite, perlite dan bainite. Ukuran butir baja tersebut menjadi lebih halus setelah PWHT dibandingkan dengan tanpa PWHT.

Pengaruh Jumlah Lubang Pendingin, Temperatur Pemanasan Dan Lebar Diameter Cetakan Terhadap Cacat Scratch Pada Cetakan Aluminium

Rachmat Firdaus, Ali Akbar, Achmad Irfan Yulianto, Mulyadi Mulyadi — Fri, 28 Jun 2024 00:00:00 +0700

Alumunium dan Metal merupakan bahan material yang umum digunakan pada industry cetakan dan juga manufaktur sparepart mobil karena sifat materialnya yang padat dan keras. Produk berbahan aluminium sering memiliki masalah dalam proses produksinya yang bisa menimbulkan hal fatal yang lebih besar seperti udara yang terjebak dalam hasil cetakan alumunium, hasil cetakan memiliki ketebalan yang abnormal, dan juga adanya goresan non prediktif pada cetakan. Oleh karena itu, diperlukan penelitian tentang teknik analisa penggunaan cetakan yang baik agar tidak menimbulkan kegagalan cetakan. Penelitian ini di laksanakan secara eksperimen dengan tiga variable yaitu lebar gap, temperature dan jumlah pendinginan. Hasil dari penelitian ini menunjukkan Gap yang kecil dengan jumlah lubang pengingan yang sedikit timbul scratch atas dan bawah dengan temperatur yang paling rendah 670^oC sampai temperature yang tinggi 750^oC. Seiring dengan peningkatan lebar gap dan jumlah lubang pendinginan maka didapatkan pengurangan scrath. Dengan lebar gap space yang besar 0,3 mm maka scrath hilang meskipun jumlah lubang pendinginan yang sedikit maupun banyak dan temperature rendah sampai tinggi.