Jurnal Energi dan Teknologi Manufaktur (JETM)
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Distribusi Ketebalan Aluminium Pada Proses Single-step Incremental Backward Hole-flanging terhadap Laju Pembentukan
Full text linkPembentukan logam masuk dalam sebuah kelompok besar dari proses-proses manufaktur. Pembentukan logam menggunakan deformasi plastis untuk mengubah bentuk benda kerja. Deformasi atau perubahan bentuk dihasilkan dari penggunaan tool yang biasanya disebut die (cetakan). Cetakan tersebut memberikan tegangan yang melebihi kekuatan yield logam (plastis). Logam selanjutnya berubah bentuk menjadi bentuk yang sesuai dengan geometri cetakan. Pembetukan flens pada lubang disebut hole-flanging. Hal ini dimaksudkan untuk memperkuat bagian tepi dari lubang atau untuk tujuan membuat ulir. Untuk pelat logam yang tipis proses ini bisa dibuat bersamaan dengan proses piercing. Proses hole-flanging ini berfungsi untuk menyediakan luasan pengikatan pada sambungan-sambung pipa. Proses hole-flanging ini kemudian dikembangkan dengan metode bertahap yang menggunakan cetakan yang sangat sederhana. Proses pembentukan ini disebut dengan incremental hole-flanging. Pada pembuatan flens untuk percabangan maupun pengikatan pada lingkungan kerja yang tertutup, proses hole-flanging konvensional tidak mampu dilakukan dengan prinsip pembentukan ke dalam. Proses pembuatan flens untuk kasus seperti ini digunakan metode incremental backward hole-flanging. Pada penelitian ini akan dianalisa karakter deformasi dari benda kerja alumunium dengan metode incremental backward hole-flanging terhadap laju pembentukan. Dimana mesinyang digunakan pada penelitian ini adalah mesin CNC 3-axis dengan parameter laju pembentukan sebesar 500, 1000, 1500, dan 2000 mm/min
ANALISA CAMPURAN METANOL–PERTALITE TERHADAP KINERJA DAN SUHU KERJA MOTOR
Full text linkThe study aims to determine the effect of using a mixture of methanol add on to pertalite to the performance of gasoline engines, especially injection system with a capacity of 250 cc engine with two cylinders. This research used experimental method with variables used in this research is mixture of pure pertalite (P), mixture of pertalite - methanol 90% - 10% (PM1), mixture of pertalite - methanol 80% - 20% (PM2), mixture of pertalite - methanol 70% - 30% (PM3), mixed pertalite - methanol 60% - 40% (PM4), 50% - 50% (PM5) pertalite - methanol mixtures, pertalite - methanol 40% - 60% (PM6). Variable related in this research is power, torque and working temperature of the engine. The results of this study indicate that the addition of methanol with pertalite fuel tends to produce lower power and torque, while the temperature of the radiator and exhaust system shows that the use of methanol mixture with pertalite fuel can significantly increase the engine temperature of the vehicle
Kekuatan Lentur Papan Komposit Hasil Kombinasi Perentase Ijuk dan Cangkang Telur Ayam
No full text The production of chicken egg is increasing every year, causing a lot of eggshell waste and abundance of natural materials of palm fiber (ijuk), but not used properly. The purpose of the research is to get the weight percentage variation of composite palm fiber and chicken eggshell with resin as a matrix. The method of this research include: the making of composite specimen from polyester resin Yukalac 157 BQTN-EX with added palm fiber and eggshell as a filler with sizes according to ASTM-D 7264, testing the composite specimens and Mahogany wood, and to analysis data from the test results is processed using Two-Way Anova to determine the effect of the percentage of palm fiber and chicken eggshell weights on flexure strenght composite. The result of flexural test show that the lowest yield strenght is on compotition of 4% palm fiber and 1% eggshell worth 11,3 MPa, and the highest yield strenght is on compotition of 9% palm fiber and 4% eggshell worth 87,7 MPa
Pengaruh Parameter Pemesinan terhadap Kualitas Hasil Potong Mesin Bubut Maximat V13 pada Benda Kerja Poros PVC
Full text linkMetal cutting process (cutting process) is to cut metal to get the shape and size and quality of the planned cutting surface. The metal cutting process is carried out with special tools, according to the type of cutting process. So the tools for one process cannot be used in another process, even for similar processes, the tools cannot be exchanged if the cutting plans are not the same. Lathe process is a machining process to produce cylindrical machine parts which are carried out using a Lathe. Its basic form can be defined as the machining process of the outer surface of cylindrical or flat lathe objects. Polyvinyl Chloride, commonly abbreviated as PVC, is the third-order thermoplastic polymer in terms of total usage in the world, after Polyethylene (PE) and Polypropylene (PP). Worldwide, more than 50% of PVC produced is used in construction. PVC is produced by polymerizing vinyl chloride monomers (CH2 = CHCl). Because 57% of its mass is chlorine, PVC is the polymer that uses the lowest petroleum feedstock among other polymers. This research follows up the selection of configuration of the lathe machining process using plastic work pieces. In this study, Maximat V13 lathe and PVC type plastic were used. The variation of machining processes are spindle rotation (320, 540, and 900 rpm), feeding speed (0.07, 0.14, and 0.28), the use of tool types (carbide and HSS) and cooling (without cooling, coolant, and oil). So, with this research, it is expected that the optimal parameters in determining the configuration of the lathe machining process on a PVC work piece to produce a good turning surface can be achieved
 
Pengaruh Waktu dan Temperatur terhadap Sifat Mekanik Pasir dan Kualitas Produk Cor dengan Metode Shell Moulding
No full textThe shell molding method is one of the processes of coating sand grains in a thermo setting resin which preserves heat on the model. To produce castings products that have good quality and produce maximum mechanical properties from the shell molding process, it must be known that the right procedure stages such as the right heating time. But currently there is no technical procedure that is found that is the right temperature and heating time for making shell molding to produce good surface quality of castings. This study aims to determine the effect of temperatures and heating time on the mechanical properties of RCS (resin coated sand) and the quality of the object castings. A series of testing methods, carried out by heating the RCS on the sample mold bending and hardness test. Testing the mechanical properties of sand includes bending test and hardness test. The time variations used in sand heating are 1 minute, 2 minutes and 3 minutes with temperature variations of 1800C, 2000C, 2200C, 2400C, 2600C and 2800C. After knowing the results of the most optimal temperature and time from testing mechanical properties then making molds using the shell molding method, the molding material used is aluminum. The mold formed from the shell molding method is then cast using NiHard1 material with a temperature of 14000C. The results of the castings will be identified visually and compared with the mechanical properties of the sand obtained. The results of this study obtained the highest value on the graph of the results of mechanical properties testing at a temperature of 2200C with a heating time of 2 minutes. The results of castings best viewed in terms of visual obtained by heating time for 2 minutes and 3 minutes at a temperature of 2200C. This showed that the heating time for 2 minutes and 3 minutes at the temperature of 2200C results in the highest mechanical properties and the best quality of castings for shell molding method
Modifikasi Alternator dan Sistem Kelistrikan Untuk Peningkatan Daya Listrik Sepeda Motor 125 cc
Full text linkThe alternator on the motor is one component of the vehicle that can be used to improve its utilization. Modifications to the alternator on the vehicle are made to increase electric power. The working principle of an electric generator is in accordance with the law of faraday if a conductor is rotated in a magnetic field until it crosses the magnetic force line (GGM), it will cause an electric force line (GGL) in volts at the end of the conductor. In the alternator to be used, the lighting coil resistance is 0.24 - 0.36 Ω and the charging is 12.3 - 13.3 V at 1500 rpm. The research conducted was an experiment by comparing the alternator output voltage before it was modified with the alternator output that had been modified. Modification of the alternator is done by the method of load variation and replacement of the diameter of the coil along with the number of turns on the alternator. Measurement of alternator before and after modification shows results that are directly proportional to the output of the alternator at 1,000 rpm - 8,000 rpm. The results of three tests can be concluded that the modification of the alternator has increased from 6.42 A for the standard alternator to 13.7 A for the modification alternator
KARAKTERISTIK TERMOELEKTRIK TEC BERVARIASI TIPE SEBAGAI PEMBANGKIT LISTRIK DC
No full textThermoelctric Cooler (TEC) merupakan sebuah komponen pendingin solid-state elektrik yang bekerja sebagai “Pemompa Panas” dalam melakukan proses pendinginan Thermoelctric Cooler (TEC) memanfaatkan efek peltier yaitu apabila arus listrik searah yang melalui sambungan dua bahan termoelektrik menghasilkan perbedaan temperatur diujung sambungan. Penggunaan elemen termoelektrik sebagai pembangkit listrik dengan merubah energi panas menjadi energi listrik merupakan konsep efek seeback yang diaplikasikan pada Thermoelctric Generator (TEG). Penelitian ini bertujuan untuk menganalisa kemampuan tipe Thermoelctric Cooler (TEC) sebagai Generator pembangkit listrik menggunakan efek seebeck. Pengujian dilakukan dengan cara eksperimental dengan memanaskan dan mendinginkan pada setiap sisi elemen termoelektrik tipe Thermoelctric Cooler (TEC). Tipe TEC yang digunakan antara lain C dilakukan untuk memperoleh nilai tegangan dan arus listrik dengan variasi pembebanan resistor sehingga dapat dihitung daya listriknya. Temperatur diatur pada perbedaan 100oC. Dari pembebanan resistor paling rendah 1 KΩ dihasilkan daya tertinggi pada tipe TEC 1-12710, dengan daya yang dihasilkan sebesar 265 X 10-5 watt. Dengan nilai tegangan listrik dan arus listrik tertinggi yang dihasilkan pada tipe TEC 1-12710 sebesar 1,83 V dan 1,59 mA. Dapat disimpulkan bahwa tipe TEC 1-12710 dapat menghasilkan daya listrik paling besar jika dibandingkan dengan tipe Thermoelctric Cooler (TEC) lain yang diujika
PENGARUH PENGATURAN MODE CO DAN RPM MESIN TERHADAP EMISI GAS BUANG SEPEDA MOTOR INJEKSI
Full text linkThe high population in Indonesia has an impact on increasing the mobility of the population in work and activities, which is followed by the increased transportation facilities needed by the community. One of the negative effects of the increasing number of vehicles is the danger of exhaust emissions. One way to minimize the danger of exhaust gases is to regulate the mixture of air and fuel on the gasoline engine. In Yamaha injection motors there is a CO setting technology, this technology will have an impact on fuel use. The standard CO on a Yamaha motorbike is 0 and can be added or reduced (±) until it reaches 30. Increasing CO one strip will cause the fuel sprayed by the injector to be reduced by 0.05 cc. Examination of exhaust gas emissions is carried out using the Qrotect 401 Engine Gas Analyzer which is capable of measuring CO2, O2, CO, HC and Lamda. Based on the test results show that the lowest exhaust emissions are produced by the vehicle at 2500 rpm and in CO-30 mode settings, namely CO gas emissions of 0.49%. So we can conclude that the lowest exhaust gas emissions are produced by the vehicle at rpm 2500 with CO-30 settings. In addition to co mode settings, variations in engine rpm also affect exhaust emissions. In different modes but with different rpm the results will also be different. In the CO 10 mode setting with rpm 1400 CO gas emission is produced at 2.102 while at 2500 rpm is produced 0.821. So at rpm 2500 produced exhaust emissions lower than rpm 1400. There is a significant effect between CO mode settings and engine rpm on motorcycle exhaust emissions
Analisa Laju Pelepasan Kalor Kondensor 10 U dan Separation Condenser Dengan Penambahan Subcooler Terhadap Koefisien Prestasi Mesin Pendingin Refrigerator Menggunakan Refrigerant Liquefied Petroleum Gas
Full text linkThe research used an experimental method by comparing the use of condenser separation with addition subcooler and condenser 10 U. In the same process condensation was done with the same condenser length with varying refrigerant discharge of 114x10-6 m3/s, 131x10-6 m3/s and 148x10-6 m3/s. The study used a refrigerant LPG (Liquefied Petroleum Gas) with a composition of 50% butane and propane 50%. The objective of study was to analyze heat release rate values of both condensers on the coefficient of machine / COP (Coefficient of Performance) value of the refrigerator. Research on the 114x10-6 m3/s refrigerant discharge resulted in average of heat release rate separation condenser with addition subcooler higher than 10 U condenser with value of 0.000455727 kW. Refrigerant discharge test 131x10-6 m3/s, the average of heat release rate separation condenser with addition subcooler is higher than the condenser 10 U of 0.000297211 kW. Refrigerant discharge test 148x10-6 m3/s, condenser 10 U yields average of heat release rate value higher than separation condenser with addition subcooler amount of 0,014013777 kW. The average value of heat release rate by the condenser 10 U will have the same trend value of COP, while at the separation condenser with addition subcooler yielding a value which is inversely proportional to the COP yield, the lower of heat release rate the resulting COP value will increase
OPTIMALISASI COMPOSIT ABSORBER PADA MUFFLER UNTUK MENURUNKAN KADAR EMISI GAS BUANG MOTOR BENSIN
Full text linkThe problem of air pollution caused by burning of fossil fuels and the process of combustion is increase. Many efforts. has done to reduce the air pollution problem. Starting from the combustion process to give equipment as reduce gass emissions and raise the quality of burning, but the ari pollution is still high, especially the burning gasoline of motor fuel Air pollution a motor vehicle exhaust gases come from the rest of the results of the combustion of fuel that do not be unraveled or burning with perfect. Bad gass emissions caused by incomplete combustion of fuel in the fuel chamber. Element contained in the exhaust gasses are CO, NO2, HC, C, H2, CO2, H2O dan N2, The CO and CO2 gasses is the most radical among the others. The CO gass is poisonous, if a men inhale this gas can caused death. While the CO2 gass is a radical gass who can cause the greenhouse effect. The aims of this research are : 1 to understand the effect of carbon composite material, lime and glue towards reductions in emission of motor vehicle . 2. to find out the optimal composition of composite material to reducing the emission level of motor vehicle.The study and research in order to reduce gas emissions until now have done using installation catalyst on muffler. In this research, the mixed of absorption exhaust gas is observed. Especially the poisonous gas. The mixture material is made from carbon, lime and glue. And then installed on muffler filter. A mixture is made by comparation varied. Using minitab software for analyse and the conclusions are: 1. The addition of absorben composition between carbon (C) with lime (CaO) on exhaust can reduce the level of gass emission. 2. The most optimal composition absorben C and CaO in absorption and produce the lowest C and CO2 gass is C and CaO with comparison ratio is 30 %: 70