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PENGARUH TIPE SALURAN PENGECORAN TERHADAP SIFAT MEKANIK DAN STRUKTUR MIKRO ALUMINIUM AL 6061 DENGAN METODE SAND CASTING
Full text linkIndustrial technology is developing very rapidly, one of which is in the field of metal casting. In the foundry case, aluminum is one of the most used types. It happen because of aluminum has many advantages than other types of metal, likely: good corrosion resistance, relatively high mechanical properties, and good formability. The purpose of this study was to determine the effect of variations in the duct system on the tensile strength and impact strength of Al 6061 aluminum using the sand casting method. A variation of this line system was to use a direct line, split line, and split line with an adder. From the results of the study, it was found that the ultimate tensile strength occurred in the specimens using a split channel pattern with an adder, which was 120.25 MPa, while the lowest tensile strength occurred in the specimens using a direct channel pattern which was 65,49 MPa. This also occurs for the highest impact value in the variation of the split pattern system with addition of 0.0081 J/mm2 and the lowest impact value is using the direct channel pattern which results in an impact value of 0.005508 J/mm
ANALISIS KERUSAKAN MESIN AHU MENGGUNAKAN PENDEKATAN METODE FAILURE MODE AND EFFECT ANALYSIS
Full text linkThe manufacturing industry is currently experiencing rapid development from various aspects. This aspect develops, it is increasingly necessary to find solutions to get more effective and efficient results. The Air Handling Unit (AHU) machine is a heat exchanger between cold water and air. The method used to identify the damage is the Failure Mode and Effect Analysis (FMEA) method. With this method, it is hoped that the point of damage that occurs can be known and can be planned for further maintenance. The results of the analysis of the FMEA method were obtained from related fields regarding the damage to the AHU engine components. Based on the results of the analysis of the Pareto diagram, it can be seen that there are several types of damage that dominant in the Air Handling Unit engine, namely; Motors & blowers; Pipe; Air Filter; Spray Nozzles. According to the principle of the Pareto diagram, which is 80/20, it means that 80% of damage to the machine is caused by 20% of the causes of damage. In this case damage the motor & blower, pipelines, air filters must be prioritized for maintenance so that the quality and efficiency of the engine is getting better
PENGARUH MERK DAN RASIO CAMPURAN ANTI GORES TERHADAP KUALITAS HASIL PELAPISAN MATERIAL LOGAM
No full textPaint is a liquid used to coat the surface of an object with the aim of decorative, reinforcing or protective of the material. Anti-scratch or varnish is a paint made from a hydrocarbon polymer without a color pigment. This study aims to determine the effect of the brand and the ratio of the anti-scratch mixture on the quality of the metal coating. The workpiece used is a 0.5 mm galvanized plate with a size of 10 cm x 10 cm. In this study, three variations of the ratio of anti-scratch and thinner mixtures will be carried out, namely 1: 1, 1: 1.25 and 1: 1.5 using the brands MTT, BLKT, WS. Spraying variations include spraying 1 sec (2x spraying), 2 secs (4x spraying), 3 sec (6x spraying). From the data collection process, two measurements will be taken, the first, the gloss test using a lux meter and a color density test. The gloss test was carried out by irradiating using three tilt angles, namely 50 °, 55 ° and 60 °. To test the color density using the Coolphptools Software. The highest gloss results occurred on the WS brand with a mixture ratio of 1: 1 resulting in a value of 9770 (lux) at an angle of 60 ° with a spray time of 2 seconds (4 times spray). The lowest yield occurred for the MTT brand producing a value of 4170 at an angle of 50 ° with a spray time of 3 seconds (6 times the spray). The results of this study generally show that the brand and the ratio of the anti-scratch mixture have an effect on the coating of metal material
PENGARUH TEMPERATUR PEMANASAN DAN WAKTU HOLDING SERAT DAUN NANAS TERHADAP KEKUATAN IMPACT KOMPOSIT EPOXY DENGAN METODE VACUUM INFUSION
Full text linkTechnological developments, especially in the material sector, have led to new discoveries, one of which is the composite type material. Composites have been widely used in the automotive industry, both for exterior and interior. This is what encourages research on composites to continue to be developed. This study aims to determine the effect of heating temperature and heating time on pineapple leaf fibers on the impact strength using the vacuum infusion method. The temperature variations given are 70 °C, 80 °C, and 90 °C. While the variation of drying time is 1 hour, 2 hours, and 3 hours. Composite material manufacturing refers to ASTM D5942-96 standard. The results of this study indicate that the highest impact value occurs in specimens with a heating temperature variation of 80 ° C with a heating time of 3 hours, which is 0.075 Joules / mm². While the lowest impact strength occurs in specimens with a heating temperature of 70 ° C with a heating time of 2 hours, which is 0.01943 Joules / mm²
OPTIMASI KUALITAS KEKASARAN PERMUKAAN PADA PROSES ELECTROPLATING MATERIAL SS400 MENGGUNAKAN METODE TAGUCHI
Full text linkQuality of product in various industries, especially in metal industry is the most attention so the product can compete and attract consumers. Surface roughness is one of the demand that must be fulfilled because it can be the initiation of cracks, especially when material receives recurring and fluctuating loading. Therefore, low surface roughness can produce a product with longer lifespan material. The goal of this study is to determine the most optimal combination of electroplating process with factors variety of voltage (volts), temperature (℃), and time of immersion (minutes) to produce a low values of surface roughness. This study uses an experimental design with Taguchi method. Contribution factors of control that produce the surface roughness values ​​were influenced significantly by control factor voltage (volts) amounted to 77.31% with an average roughness value of 1.29 μm. This is due to the increase in voltage which causes the deposition of electrolyte ions which is faster in the deposition structure of the specimen. Where as other control factors were not effected significantly on the temperature control factor amounted to 4.85% with an average roughness value of 1,32 μm. These results are possible because the temperature variations used (40℃ to 50℃) are still within the optimum operating temperature. And the other control factors is immersion time amounted to 10.13% with an average roughness value of 1,32. The result ware obtained because the length of coating time affected the quantity of deposition of nickel ions on the surface of the specimen. The result of optimal condition is the voltage level 2 (6 volts), the temperature at level 2 (45℃), and the immersion time at level 3 (25 minutes)
PENGARUH VARIASI JENIS PENDINGIN DAN KEDALAMAN POTONG PADA PROSES BUBUT BAJA ST60 TERHADAP UMUR PAHAT
Full text linkTurning machining process is a warkpiece diameter reduction by using chisel cut to produce the shape of the workpiece on a turning, there are various types of machining turning chisel pieces on the turning chisel types include carbide, CBN, and insert. There are also other types on conventional chisel on a turning process, one of which is a turning type of high speed steel (HSS), the turning is widely used in coventional production processes for other than low cost is also easy to grinding. Parameter in this research is coolant and depth of cut. The coolant used is dromus, ex-oil, ex cooking oil. The depth of cut used is 0,3mm, 0,5mm amd 0,8mm. The highest of tool life in this reserch with dromus as coolant at 0,3mm depth of cut is 83,17 minutes. With ex-oil at 0,3 depth of cut the tool life is 70,79 minutes. And with ex-cooking oil the tool life is 56,77 minutes with 0,3mm depth of cut. While the lowest tool life be obtained with ex-cooking oil coolant at 0,8mm depth of cut is 38,90 minutes. So, the canclusion dromus is a batter then ex-oil and ex-cooking oil. This is caused when the dromus as coolant can mixed with water and become one so can get down temperture of chisel
UNJUK KERJA COOL BOX BERBASIS THERMOELEKTRIK COOLER DENGAN SINGLE DAN MULTI-STAGE TERMOELEKTRIK
Full text linkThermoelectric technology works by converting thermal energy into electricity directly or preferably. Thermoelectric technology works by converting thermal energy into electricity directly or preferably. Theuse of thermoelectric as a cooler in cool box systems has been extensively studied. The thermoelectric cool ability can be achieved depending on the design of a good system. Therefore, this study aims to determine the performance of thermoelectric cooler cool box based on single and multi stage. Tests carried out using cool boxes of dimensions of 31 cm x 19 cm x 24 cm witha thickness of 3 cm and with the TEC1 12706 module. The voltage used in each configuration is 12 Volts. Temperature data readings on laptops using DAQNavi_SDK data logger connected to type K thermocouples. The result showed the multi stage configuration reached a room temperature of around 19.3 oC and 21.8 oC for single stage. Meanwhile, the multi stage configuration COP value is 1.36 and with a single stage configuration is0.88. It can be concluded that the thermoelectric configuration has an influence on the performance of the cool box system.
Keywords: Cool box, Thermoelectric module, Multi stage, single stage, CO
KARAKTERISASI KEKERASAN DAN STRUKTUR MIKRO BAJA AISI 410 PADA PROSES TEMPERING DENGAN VARIASI MEDIA PENDINGIN
Full text linkIn AISI 410 steel, the characteristic changes observed in this study were the value of hardness, and microstructure shape. Material samples heated on temperature 9000C and held for 45 minutes, with cooling medium variation used are water, used oil, and SAE 20W-50 oil. In the process, tempering the material sample returns heated on 3000C and held for 15 minutes, then cooled in the room open. The results showed that the microstructure formed in AISI 410 steel after heat treatment is martensite lath, ferrite and austenite. From the results has been obtained, that the quenching process with a variety of cooling media used and followed by the tempering process can affect the shape of the microstructure of AISI 410 steel, changes that occur are increase in the hardness value of the material. The results showed that the sample quenching water had the highest hardness is 378 HV, followed by quenching of SAE 20W-50 oil and used oil with grades of 377 and 362 HV, respectively. The increase in hardness value occurs due to changes in the micro structure that occur due to the heat treatment process. The increase in the value of hardness that occurred in the material was 143.7%
PERBANDINGAN EMISI GAS BUANG MENGGUNAKAN BAHAN BAKAR PERTALITE DENGAN BAHAN BAKAR GAS ELPIJI PADA MESIN TRIARROWS TR200
Full text linkIndonesia is one of the countries with the third highest level of air pollution in the world. The contribution of motor vehicle exhaust emissions as the largest source of air pollution reaches 60-70%, compared to industry which only ranges between 10-15%. The purpose of this research is to find out the Comparison of Flue Gas Emissions Using Pertalite Fuel with LPG Fuels on the Tr200 Triarrows Engine , The testing place at the Mechanical Engineering Lab of the University of Muhammadiyah Pekajangan Pekalongan, the research method using descriptive data analysis methods and as a dependent variable CO and HC flue gas and independent variables are 2500 rpm, 3000 rpm, 3500, 4000 rpm, 4500 rpm and 5000 rpm. Tests were conducted to determine the value of exhaust emissions on pertalite fuel and LPG gas fuel on the Triarrows Tr200 Generator. From the results of the study it was found that some significant decreases in the value of CO gas emission occurred at 3500 rpm - 5000 rpm which is the concentration decreased by 7.97% from 8.07% to 0.1% at 3500 rpm. While the concentration of HC gas emissions which is very significant at 2500 rpm - 5000 rpm which is the value of concentration decreased by 3945 ppm from 4412 ppm to 467 ppm at 3000 rpm. Keywords: Generator, Pertalite, Flue Gas Emissions, CO, H
ANALISIS UNJUK KERJA MESIN DIESEL DENGAN BAHAN BAKAR CAMPURAN PERTADEX DAN BIODIESEL DARI BIJI KEMIRI
Full text linkThe decline in fuel oil production has led to the development of alternative fuels that are renewable and more environmentally friendly. An alternative fuel that can be developed is biodiesel. In this study aims to develop alternative biodiesel fuels as a substitute for fossil oil fuels that are feasible applied to diesel engines. This study conducted a diesel engine performance test using mixed fuel from pertadex and biodiesel Aleurites Moluccana with a variation of biodiesel mixture B10, B20, and B30. From the test results using a mixture of biodiesel, the ef ective power and torque produced by the engine decreases compared to using pure pertadex. Among the three variations of the biodiesel mixture, the best ef ective power produced by B10 fuel is 277 Watt and the best torque produced by B10 fuel is 1,238 Nm. Specific fuel consumption in all biodiesel blends is increased compared to pure pertadex. Among the three variations of the biodiesel mixture, the best specific fuel consumption produced by B30 fuel is 1197,67 g/kWh. The thermal ef iciency in all biodiesel blends is increased compared to pure pertadex in B20 and B30 blends. Among the three variations of the biodiesel mixture, the best thermal ef iciency produced by B20 fuel is 7,883 %. The opacity of the engine exhaust gas produced in all biodiesel mixes is getting better compared to using pure pertadex. The best opacity of the engine exhaust gas produced in the use of B30 fuel is 2,3% HSU.
Keywords: Biodiesel, Aleurites Moluccana, Diesel Engine Performance, Opacit