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Analisa pertumbuhan keausan pahat karbida coated dan uncoated pada alloy steel AISI 4340 Sobron Lubis; Steven Darmawan; Rosehan Rosehan; Tommi Tanuwijaya
Jurnal Energi Dan Manufaktur Vol 9 No 2 (2016): Oktober 2016
Publisher : Department of Mechanical Engineering, University of Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2300.081 KB)

Abstrak:Keausan pahat merupakan data yang sangat penting dalam perencanaan pemesinan. Penelitian ini menjelaskan tentangpercobaan pertumbuhan keausan pahat pada karbida coated dan uncoated dalam pembubutan bahan alloy steel AISI 4340.Penelitian dilakukan dengan memperhatikan pertumbuhan keausan pada menit 12, 24, 36, 48, 60 sampai didapat VB sebesar0.3 mm untuk kedua mata pahat, sedangkan kondisi pemotongan lain seperti gerak makan, kedalaman potong, kecepatanpotong konstan. Tujuan penelitian ini adalah untuk mengkaji secara ilmiah pertumbuhan keausan yang terjadi pada mata pahatkarbida coated dan uncoated pada proses pemotongan alloy steel AISI 4340. Metode grafik digunakan untuk analisispercobaan, untuk melihat perbandingan pertumbuhan keausan mata pahat karbida coated dan uncoated serta mekanismekeausan yang terjadi, serta korelasi pertumbuhan keausan dengan kekasaran permukaan benda kerja. Hasil penelitianmendapatkan keausan pahat karbida coated pada menit 60 dengan VB sebesar 0.366 mm, sedangkan pada karbida uncoatedpada menit 36 sebesar 0.45 mm. Mekanisme keausan yang terjadi adalah keausan adhesi.Kata Kunci: Pahat potong karbida, baja paduan, keausan pahat, keausan tepi.Abstract:A tool life is an important data in planning a machining process. In this research, an experiment describe about growth of toolwear on carbide coated and uncoated cutting tools used in turning process of an alloy steel of AISI 4340. The experiment wasconducted by observing the growth of tool wear on minutes 12, 24, 36, 48, 60 until get VB 0.3 mm for both of cutting tools, whilethe other cutting conditions such a feed rate, depth of cut, cutting speed constant. The purpose of this experiment is to examinescientifically the growth of tool wear on carbide coated and uncoated in turning process of and alloy steel of AISI 4340. Graphicalmethod used for analisis of the experiment, to compare the growth of tool wear on cutting tool carbide coated and uncoated, andthe mechanisms that happened, and correlation between tool wear with workpiece surface roughness. The result of theexperiment is tool wear for carbide coated on 60 minutes with VB 0.366 mm, and carbide uncoated on 36 minutes with VB 0.45mm. The mechanism of tool wear that happened is adhesion wear.Keyword : Carbide cutting tool, alloy steel, tool wear, flank wear

PENGARUH UNSUR SILIKON PADA ALUMINIUM ALLOY (Al – Si) TERHADAP SIFAT MEKANIS DAN STRUKTUR MIKRO Ratih Ponco K.S; Erwin Siahaan; Steven Darmawan
Jurnal Ilmiah Teknik Mesin POROS Vol 14, No 1 (2016): Jurnal Ilmiah Teknik Mesin POROS
Publisher : Program Studi Teknik Mesin Universitas Tarumanagara

Abstract: PENGARUH UNSUR SILIKON PADA ALUMINIUM ALLOY (Al – Si) TERHADAP SIFAT MEKANIS DAN STRUKTUR MIKRO Ratih Ponco K.S., Erwin Siahaan dan Steven Darmawan Jurusan Teknik Mesin, Fakultas Teknik Universitas Tarumanagara Aluminum is one of type in material non-ferrous metals are frequently and widely used in fields of application in industry. One application that performed in the industrial world, namely Aluminum Silicon (AlSi) which are used for the motor piston components. To get better mechanical properties then the integration of Aluminum Silicon research done by arranging the variety of Si element content on a percentage of 6, 8, and 10% Si.Testing is done by using a blend of 10% genuine with further lowering the Si content to reach 6% and 8% by adding pure aluminum. The test showed that the level of harness decreased 12,5% and also the ability of toughness decreased by 4%. Observation show that the microstructure is relatively homogeneous and there is a dominant form of micro-structure of pure Al and several dendrites CuAl.

UJI EKSPERIMENTAL MESIN PENDINGIN BERPENDINGIN COOLANT DENGAN MENGGUNAKAN REFRIGERAN R22 DAN REFRIGERAN R407C Fransiskus Xaverius Phie; Harto Tanujaya; Steven Darmawan
Jurnal Ilmiah Teknik Mesin POROS Vol 13, No 1 (2015): Jurnal Imliah Teknik Mesin Poros
Publisher : Program Studi Teknik Mesin Universitas Tarumanagara

Abstrak: Salah satu penyebab kerusakan lapisan ozon adalah zat pendingin. Kandungan zat pendingin akan terurai setelah dicampur dengan sinar ultraviolet. Itu juga molekul refrigeran yang tepat yang melepaskan atom klorin. Klorin yang dikeluarkan akan menghancurkan lapisan ozon dan tingkat sinar ultraviolet yang masuk ke bumi yang lebih tinggi. Tapi tidak semua jenis zat pendingin mengandung klorin. Jenis zat pendingin yang biasa digunakan pada pendingin mesin adalah R22. Refrigeran mengandung unsur klorin sehingga perlu memeriksa penggantian refrigeran R22. Jenis zat pendingin yang memiliki kesamaan namun tidak mengandung unsur klorin adalah zat pendingin R407c. Penelitian dilakukan dengan mengambil beberapa data dari kedua jenis refrigerant tersebut. Tujuan dari penelitian ini adalah untuk menghitung laju kondensor perpindahan panas, kompresor pendingin, kapasitas daya dan koefisien kinerja setiap refrigeran. Penelitian dimulai dengan belajar tentang siklus kompresi uap, komponen utama dari pendingin mesin, sifat refrigeran, dan konsep pendinginan. Pengambilan data tekanan, suhu, dan arus listrik kuat berdasarkan debit 20 liter / jam, 40, 80, dan 120. Air pendingin kondensor menggunakan jenis pendingin, air dan udara. Data yang telah diambil akan dihitung dengan menggunakan rumus sistem pendingin. Pada refrigeran air dingin berpendingin pendingin R22 dengan koefisien perfomance lebih besar dari R407c. Pada nilai alir 40 l / h R22 adalah 6,58 Kata Kunci: Refrigeran, klorin, koefisien kinerja, dan efisiensi

ANALISIS KINERJA COOLANT PADA RADIATOR Alexander Clifford; Riza Abrar; Steven Darmawan
Jurnal Ilmiah Teknik Mesin POROS Vol 12, No 2 (2014): Jurnal Ilmiah Teknik Mesin POROS
Publisher : Program Studi Teknik Mesin Universitas Tarumanagara

Abstract: This research learn about characteristic of radiator coolant effectiveness, which are influenced by flow rate, density, and fluid viscosity. Experimental method is used to get parameters: such as coolant temperature, air temperature and flow rate. This study use ɛ-NTU method to analyze the data. The results of coolant A, B, and water have effectiveness of 40%, 37%, and 36% respectively, it is caused by coolant A have the biggest Universal coefficient number and convection coefficient number are compared with coolant B and water.

EVALUASI DESAIN TERMAL KONDENSOR PLTN TIPE PWR MENGGUNAKAN PROGRAM SHELL AND TUBE HEAT EXCHANGER DESIGN Steven Mangihut Darmawan; Steven Darmawan; Suroso Suroso
Jurnal Ilmiah Teknik Mesin POROS Vol 12, No 1 (2014): Jurnal Ilmiah Teknik Mesin POROS
Publisher : Program Studi Teknik Mesin Universitas Tarumanagara

Abstract: The study was executed to get a quick calculation method for the design of equipment heat exchanger type shell and tube with a program shell and tube heat exchanger design. The purpose of this study was to obtain the results of the validation program shell and tube heat exchanger design of a condenser with power 4368.75 kW and the results of the evaluation program shell and tube heat exchanger design on the thermal design condensers nuclear power plant AP1000 PWR type. Input data into the program is done by inserting the parameters temperature, flow rate, physical properties and geometrical dimensions of the available designs of heat exchanger equipment specifications. Parameter for comparison of data can be obtained from the results of other calculations or experimental data. The results of comparison of the validation program shell and tube heat exchanger with condenser design calculations showed the highest difference found on Utube parameter equal to 1.3% lower than the design condition. This occurs because of differences in calculation between the program designed. The result evaluation of program shell and tube heat exchanger design toward the thermal design condensers nuclear power plant PWR type AP1000 obtained unknown parameters from the technical specifications.

ANALISIS KEMAMPUAN PROSES PELAPISAN POLYUREA PADA ACRYLIC DENGAN KETEBALAN TERTENTU TERHADAP SIFAT MEKANIK Jason Arie Putra; Erwin Siahaan; Steven Darmawan
Jurnal Ilmiah Teknik Mesin POROS Vol 14, No 2 (2016): Jurnal Ilmiah Teknik Mesin POROS
Publisher : Program Studi Teknik Mesin Universitas Tarumanagara

Abstract: Coating became quite common. The coating serves as a conduit of color and also to cover the base material. Polyurea coating is a new innovation in the field of industry, so far polyurea coatings are used to coat the walls of the building and also the roof of the building to tackle the problem of leakage. This study explains how large the influence of the Polyurea coatings to acrylic. In this study which is distinguished by variations in thickness 3mm acrylic, 5mm and 8mm. This study also discusses the tensile resilience and resistance to shock loads. The purpose of this study was to determine how much influence the Polyurea coatings by comparing with Polyurea acrylic coated and uncoated. As an example of the results obtained from tensile tests that 3mm acrylic coated and uncoated increased by 39.6% acrylic 5mm by 0.66% and 1.65% acrylic 8mm. Polyurea coatings can not deliver maximum results on specimens that have smooth surfaces, so that we can see that in every test carried downhill result.

USULAN DESAIN STOPPER SEBAGAI ALAT BANTU PROSES GROOVING PADA PART SUCTION COVER POMPA SENTRIFUGAL TIPE Y DI PT X Ricky Soleman Manikari; Steven Darmawan
POROS Vol. 18 No. 1 (2022): Jurnal Ilmiah Teknik Mesin Poros
Publisher : Program Studi Teknik Mesin Universitas Tarumanagara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24912/poros.v18i1.18031

Centrifugal pumps have a design consisting of an impeller rotor and an inlet channel in the middle. When the rotor of impeller rotates, the fluid will flow into the casing due to the centrifugal force. Suction Centrifugal pump casing is designed in the form of a diffuser that surrounds the pump impeller. This diffuser is more commonly known as the volute casing. In accordance with the function of the diffuser, the volute casing serves to reduce the flow velocity of the fluid entering the pump. The stopper is a fixture that is used as a support for the suction cover part during the grooving process. Stopper is used so that the surface turning results are not oval . Grooving is a process to form a groove on a workpiece by using a lathe or milling machine and others . To give the results of the groove surface on the suction cover, it is necessary to carry out a grooving process. The grooving process is used to smooth the grooves on the suction cover surface. However, because the diameter of the suction cover is quite large, an additional fixture is needed to support the suction cover so that it remains in an even position during the grooving process. The stopper is important thing in the process of grooving suction cover type E-100 50 with a spindle speed of 180 rpm. The dimensions of the proposed stopper are 155.88 mm long, 150mm wide, and 150m high. So this stopper fixture must be strong and stable during the machining process. The purpose of this paper is to propose a 3D fixture design during the process of grooving the suction cover E 100 50. This research was carried out theoretically using data machining and parts obtained during observation. Compilation of observational data in the form of images and strength analysis in 3 dimensions using Autodesk Fusion 360 software. The results of this study are divided into 2 parts, 3D design and strength analysis including von mises stress, displacement and safety factor. From the results of the simulation von mises in picture 8, it shows that the stress that occurs is 32.59 MPa at the most critical part. The critical part is the upper support section which is the center of support. From the results of the simulation displacement in picture 9 it shows that the change (displacement) in the design stopper maximum so that deformation occurs, which is indicated by a red color of 0.002668mm. Changes above 1mm the material will break. This shows that the shape and dimensions of the stopper are said to be in the safe category. From the picture of the results of thesimulation Safety Factor in picture 10, it shows that the value of the safety factor for a sufficient level of safety is 6.353. If it is less than the value of the safety factor, the material has been deformed or broken because the maximum stress is comparable to or greater than the yield strength of the material.

PENGARUH NILAI OKTAN TERHADAP UNJUK KERJA MESIN DAN KAJIAN ANALISIS PEMBAKARAN AKIBAT DELAY COMBUSTION PADA MESIN OTTO SATU SILINDER Radedo Ganda Halim; Abrar Riza; Steven Darmawan
Jurnal Cahaya Mandalika ISSN 2721-4796 (online) Vol. 3 No. 1: Jurnal Cahaya Mandalika
Publisher : Institut Penelitian Dan Pengambangan Mandalika Indonesia (IP2MI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36312/jcm.v3i1.1947

Gasoline is one type of fuel oil for two, three, and four wheeled motorized vehicles. Gasoline have two components, n-heptane (C7H16) and isooctane (C8H18). The quality of gasoline can be determined from amount of isooctane or which is also known as the octane number. Octane number is the number represents the volume percent of isooctane in gasoline. An octane number of 100 means that the gasoline is equivalent to pure isooctane in terms of combustion properties. While the octane number 0 means that the gasoline is equivalent to pure n-heptane. Octane number 92 means that the gasoline consists of 92% isooctane and 8% n-heptane. Nowdays, gasoline has appeared with various and higher octane numbers. The higher the number octane, the more efficient the process of burning the gasoline and selection of the wrong type of fuel oil can affect engine performance. For determine the performance, fuel conumption, on a vehicle, fuel testing is carried out on the Honda GX 160 engine to compare the results of fuel performance Pertalite (90), Pertamax (92), and Pertamax Turbo (98). In this test what will be carried out is to look for the efficiency of each fuel according to the RPM that has been determined, 1800, 2100, 2400, 2700, and 3000. So from each of these RPM you wil see the torque and time of reduced fuel consumption in 8mm tube. From there, you will see the comparison between each fuel, whether it is getting higher and more efficent or not. The increase that occurs in the delta h ratio between pertalite and Pertamax results in an increase of 7% at 2400 rpm, even though the initial torque of Pertalite is higher but the increase in Pertamax remains stable.

EFEK BESARNYA PENGAPIAN BUSI TERHADAP UNJUK KERJA MESIN OTTO SATU SILINDER Lukas Satrya; Abrar Riza; Steven Darmawan
Jurnal Cahaya Mandalika ISSN 2721-4796 (online) Vol. 3 No. 1: Jurnal Cahaya Mandalika
Publisher : Institut Penelitian Dan Pengambangan Mandalika Indonesia (IP2MI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36312/jcm.v3i1.1962

Along with the development of the times required vehicles that have good performance quality performance. One of them is by improving the quality of combustion that occurs in the combustion chamber. The research method used in this test is to determine the rotation and torque generated from each spark plug. Based on the data obtained, the torque and power generated by iridium spark plugs increases compared to nickel spark plugs, namely at 1800 RPM it produces 15 Nm of torque with 2.826 kW of power to 16 Nm of 3.0144 kW of power. From the test data, iridium spark plugs can increase ∆ BHP by 7%. But not with the specific fuel rate in the combustion engine produced by iridium spark plugs, the best results are higher than the specific fuel rate produced by nickel spark plugs, namely 2.0101 x 10-5 kg/kW.s at 3000 RPM rotation while the results the best specific fuel rate is 1.29 x 10-5 kg/kW.s at 2700 RPM rotation. This means that iridium spark plugs can increase the torque and power of the combustion engine because the combustion that occurs in the combustion chamber is faster so that combustion occurs in a rich state.

PENGARUH JENIS BUSI TERHADAP EMISI GAS BUANG MESIN OTTO 1 SILINDER Ida Bagus Rayhan Lovaryan Putra Wijaya; Abrar Riza; Steven Darmawan
Jurnal Cahaya Mandalika ISSN 2721-4796 (online) Vol. 3 No. 1: Jurnal Cahaya Mandalika
Publisher : Institut Penelitian Dan Pengambangan Mandalika Indonesia (IP2MI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36312/jcm.v3i1.1965

Exhaust emissions are a mix of different gases and particles emitted by vehicles when the engine is running. Cars emit a potent mix of exhaust gases, many of which have harmful effects. They include CO2¬¬¬, CO, NOx, SO2, HC, and Particulates. Pollutants from cars are linked to a range of health problems, from allergies and skin irritation to heart disease and respiratory problems. Exhaust emissions correlated heavily with spark plugs. Spark plug is a device that fits into the cylinder head of an internal combustion engine and carries two electrodes separated by an air gap, across which current from a high tension ignition system discharges, to form a spark for igniting the air-fuel mixture. For determining the effects of types of spark plugs to emissions, the test is carried out on the honda GX 160 engine to compare nickel alloy and iridium spark plugs. The engine will be tested at 1800, 2100, 2400, 2700 and 3000 RPM to compare the exhaust emission emitted by the exhaust.

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