JURNAL MESIN TEKNOLOGI
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THE EFFECT OF WATER TEMPERATURE AS QUENCHING MEDIA ON THE CHARACTERISTICS OF HV 350 WELD DEPOSITS
Full text linkHardness is a mechanical property that is needed when doing the hardfacing process. Increased violence can be generated by conducting a quenching process. The temperature of the quenching media is one of the important factors to produce maximum hardness. In this study a two-layer welding process will be carried out using HV 350 electrodes on low carbon steel then the specimens are heated in a furnace and quenching is carried out into water with two variations in water temperature namely 15 and 30 °C. Variations in water temperature during quenching produce varying hardness and microstructure. The highest hardness is produced at 15 °C where in micro photographs there are a few phases of smaller size compared to other specimens.Hardness is a mechanical property that is needed when doing the hardfacing process. Increased violence can be generated by conducting a quenching process. The temperature of the quenching media is one of the important factors to produce maximum hardness. In this study a two-layer welding process will be carried out using HV 350 electrodes on low carbon steel then the specimens are heated in a furnace and quenching is carried out into water with two variations in water temperature namely 15 and 30 °C. Variations in water temperature during quenching produce varying hardness and microstructure. The highest hardness is produced at 15 °C where in micro photographs there are a few phases of smaller size compared to other specimens
Analysis of Corrosion Rate in Centrifugal Pump Intake Pipes (Case Study: PDAM Bengkalis Indonesia)
Full text linkPipe is one of the important components for a clean water treatment system that is used to transport water flow. For the process of producing water from the reservoir to the tank, it still uses galvanized steel pipes, this type of pipe is used by PDAM Bengkalis. Based on the previous explanation, it is very necessary to do a research on the corrosion rate in the intake pipe to determine the level of corrosion that occurs by using the Ultrasonic Thickness Gauge test by looking at the thickness reduction in the pipe. This study uses an experimental method. Corrosion is a process of decreasing the quality of metal materials caused by chemical reactions between metal materials and other elements in their environment. From this study, 2 types of galvanized steel pipes are found with different ages, they are 7 years old pipe with 6 inches lenght and 10 years old pipe with 10 inches length, while the corrosion rate that occurred in the intake pipe in zone A was 0.245 mm/year, 0.392 mm/year, and 0.248 mm/year, for zone B is 0.335 mm/year and 0.268 mm/year, in zone C is a straight line pipe as a comparison factor with a corrosion rate of 0.473 mm/year, 0.470 mm/year, 0.287 mm/year, 0.464 mm/year, and 0.306 mm/year
MODELING AND VIBRATION RESPONSE ANALYSIS OF PELLET MACHINE GRINDER AND GEARBOX
Full text linkPellet machine is a machine used to print feed in the form of pellets. In this machine, if it operates, it can experience excessive vibration and the force acting on the machine is close to its natural frequency and can cause damage, so it needs to be reduced. In this study, the objective of this research is to model and simulate vibrations in the gearbox and grinder to determine the results of the displacement and acceleration vibration responses on the pellet machine. In this study, an electric motor is used as a source of rotation and an input clutch as a connection between the shaft of the electric motor and the gearbox as a transmission to reduce the speed of the electric motor, where the rotation produced by the electric motor contains vibrations, the output coupling is the connecting shaft between the gearbox shaft and the shaft grinder and miller as a tool used to print pellets. From the existing physical form, mathematical equations and simulation blocks are constructed. In this research, it is found that the vibration response generated from the gearbox and grinder can be modeled with the x and z axes as the center of the system. The higher the vibration response, the higher the given frequency, the greater the amplitude and rms of the displacement and acceleration responses in each part, namely the motor, clutch in, gearbox gearbox, coupling out, and grinder will be greater. The result of displacement vibration response yields an rms of 1.956. The worm gear in the gearbox produces a displacement vibration of 1.0585 m and an acceleration of 6.8485 m/s2. The mill produces a displacement vibration of 1.0891 m and an acceleration of 5.1095 m/s2.Pellet machine is a machine used to print feed in the form of pellets. In this machine, if it operates, it can experience excessive vibration and the force acting on the machine is close to its natural frequency and can cause damage, so it needs to be reduced. In this study, the objective of this research is to model and simulate vibrations in the gearbox and grinder to determine the results of the displacement and acceleration vibration responses on the pellet machine. In this study, an electric motor is used as a source of rotation and an input clutch as a connection between the shaft of the electric motor and the gearbox as a transmission to reduce the speed of the electric motor, where the rotation produced by the electric motor contains vibrations, the output coupling is the connecting shaft between the gearbox shaft and the shaft grinder and miller as a tool used to print pellets. From the existing physical form, mathematical equations and simulation blocks are constructed. In this research, it is found that the vibration response generated from the gearbox and grinder can be modeled with the x and z axes as the center of the system. The higher the vibration response, the higher the given frequency, the greater the amplitude and rms of the displacement and acceleration responses in each part, namely the motor, clutch in, gearbox gearbox, coupling out, and grinder will be greater. The result of displacement vibration response yields an rms of 1.956. The worm gear in the gearbox produces a displacement vibration of 1.0585 m and an acceleration of 6.8485 m/s2. The mill produces a displacement vibration of 1.0891 m and an acceleration of 5.1095 m /s2
NUMERICAL STUDY OF COMPARISON THE EFFECT OF FRICTION AND RESTITUTION COEFFICIENT ON SEPARATION EFFICIENCY OF CYCLONE
Full text linkNumerical modeling of cyclone on separation process was developed to increase the efficiency of collection. In terms of increasing the accuracy, this researsh was conducted to observe comparison in between the effect of coefficient of friction (COF) and restitution (COR) on the effeciency of colection. This reseacrh was using ANSYS 17 to simulate cyclone in 3D geometry. Where the variation of COR was 0,0.5 and 1 while the COF was 0,10,20 and 120. The result shows COR has not correspondence to the efficiency of collection but COF has inverse correspondence. Hence, the more friction on the cyclone surface, the more resistant sand particle to go down
The Effect of Holding Time on Stress Relief Annealing Process to Hardness of Carbon Steel SA.106 Grade B After Welding
Full text linkStress relief annealing (SRA) is a process of releasing residual stresses contained in the material due to the welding process. The need for SRA is due to heterogeneous changes in the microstructure when the material is exposed to the heat of welding so that it will cause the mechanical properties of the material to change. One of the mechanical properties that experience significant changes is hardness (hardness value) because it can experience an increase. Therefore it is necessary to decrease the hardness value through a heat treatment SRA that takes into account the appropriate holding time. The purpose of this study was to determine the effect of holding time variations on the value of the welding material hardness for the carbon steel case SA.106 Gr.B. During this time after welding SA106 material specifically under 19 mm thickness is not heat treatment after welding even though the welding effect will change the properties of this material, so it is necessary to heat treatment with certain holding time variations to determine its effect on the mechanical properties of the material. The welding process uses SMAW with E7018 electrodes. Specimen heating is carried out in a heating oven to a constant temperature of 650oC with variations in the heating time of 15 minutes, 30 minutes, and 45 minutes. Furthermore, hardness testing is done by testing the base metal area, heat affect zone, and weldment. The results that SRA greatly influenced the hardness value of a welded material, based on testing the highest hardness value in the SRA heat treatment was obtained at a holding time of 45 minutes with a hardness value on the base metal of 67 HRC (BM), HAZ area of 65.25 HRC, and weldment area of 64.42 HRC. But at the holding time for 45 minutes, the value of material hardness tends to be more uniform compared to other variables
EFFECT OF IGNITION SYSTEM IN MOTORCYCLE TO PERFORMANCE AND EXHAUST GAS EMISSIONS WITH FUEL RON 88, RON 90, AND RON 92
Full text linkIn the automotive field, the development of motorcycle ignition systems has been able to improve engine performance more fuel efficient. TCI has the advantage of transferring high voltage to the spark plug, the results issued from TCI are greater than the CDI system. To find out the results of motorcycle performance, namely the TCI ignition system and spark plugs on performance and exhaust emissions from motorcycles that use fuels such as Premium Ron 80, Pertalite Ron 90, and Pertamax Ron 92. Fuels that have octane that matches the bicycle motorcycles, in addition to the better performance of motorcycle engines, the fuel consumption is also more economical. In this study there are three variables, namely variations in rpm, performance and exhaust emissions. The results of the study of motorcycles that use the Ron 92 Pertamax fuel have far more torque and power than those that use the Ron 80 premium fuel and the pertalite Ron 90, while the HC levels produced by Ron 80 and 90 fuels tend to increase more than Ron fuel 92 which is between 65 - 228 ppm. CO2 levels were 12.53% while Pertamax was 10.74%, and pertalite was 11.17%, while the CO content produced was small at 3750 rpm resulting CO levels of 0.08 ppm. It can be concluded that the ignition produced is more stable which uses Pertamax fuel compared to using premium and pertalite fuel
OPTIMIZATION OF SURFACE ROUGHNESS IN TURNING S45C CARBON STEEL MATERIAL USING THE TAGUCHI METHOD
Full text linkThe value of minimal surface roughness is the performance to be achieved in the Takisawa TSL-800 lathe. Therefore, it is necessary to adjust the variables of the Takisawa TSL-800 lathe process precisely in order to obtain a minimal surface roughness response. Determining the proper settings of the Takisawa TSL-800 lathe process variables will result in the expected surface roughness of the workpiece. The variables of the machining process that are varied are spindle speed, feed rate and depth of cut. The experimental design was determined based on the Taguchi method and was in the form of an Orthogonal L9 matrix (33)
Flow Analysis In Pump As Turbines (PATs) Using Ansys Fluent Software
Full text linkPump As Turbines (PATs) is a small-scale power plant that uses hydropower as its driving force. The working principle is given the flow of water from a certain height into the pump output to produce pressure at the tip of the impeller blade and will rotate the impeller blades. In this research will be an optimization of Pump As Turbines (PATs) by changing the angle of the impeller blade tip to get the optimum design of Pump As Turbines (PATs) using Ansys fluent software. In using angle tip impeller blade 600, 450, 350, 300, and 250, pressure tip impeller blade the lowest on angle tip impeller blade 600 using incoming pressure 7 psi (0.483 bar) with a pressure value tip impeller blade 0.123 bar and the biggest one is angle tip impeller blade 250 using incoming pressure 14 psi (0.965 bar) with a pressure value tip impeller blade 0.543 bar. Based on the results of the impeller blade tip pressure obtained the optimal design of Pump As Turbines (PATs) is angle tip impeller blade 250 because of the critical angle of Pump As Turbines (PATs) if you use an impeller design less than 250 then the impeller blades will run out so that it can affect the resulting rotation
IMPROVING THE EFFECTIVENESS OF PRIMARY ROLLING MACHINE WITH OEE AND SIX BIG LOSSES METHOD
Full text linkEach company wants to improve the efficiency of the production process so that it can compete in terms of price and quality with other companies. The company that is the object of this research is engaged in electronics manufacturing. The problem that occurs is the difference in production results between the company's target and the reality that occurs, with an indication of a decrease in the effectiveness of production machines. The highest reduction in machine effectiveness occurred in primary winding machines. The purpose of this research is to measure the value of the effectiveness of the primary rolling machine using the overall equipment effectiveness (OEE) method and six big losses. Furthermore, to analyze the factors that are the main priority as a basis for improvement proposals to increase production efficiency using a causal diagram. In the calculation, OEE measures effectiveness with 3 points of view, namely availability, performance, and quality. To determine the decrease in machine effectiveness, the six big losses method was used. The results showed that the average effectiveness level of the primary rolling machine during the study period was 80.7%, with an average value of 97.75% availability, 68.15% performance, and 99.65% quality. Meanwhile, the one that most affected the decrease in the effectiveness of the primary rolling machine was reduced speed losses.Each company wants to improve the efficiency of the production process so that it can compete in terms of price and quality with other companies. The company that is the object of this research is engaged in electronics manufacturing. The problem that occurs is the difference in production results between the company's target and the reality that occurs, with an indication of a decrease in the effectiveness of production machines. The highest reduction in machine effectiveness occurred in primary winding machines. The purpose of this research is to measure the value of the effectiveness of the primary rolling machine using the overall equipment effectiveness (OEE) method and six big losses. Furthermore, to analyze the factors that are the main priority as a basis for improvement proposals to increase production efficiency using a causal diagram. In the calculation, OEE measures effectiveness with 3 points of view, namely availability, performance, and quality. To determine the decrease in machine effectiveness, the six big losses method was used. The results showed that the average effectiveness level of the primary rolling machine during the study period was 80.7%, with an average value of 97.75% availability, 68.15% performance, and 99.65% quality. Meanwhile, the one that most affected the decrease in the effectiveness of the primary rolling machine was reduced speed losses
Design and Manufacturing of Bodypack Portable Milk Machine with Capacity 5 Liters
Full text linkThe conventional milking process by cattle breeders in hilly areas is considered ineffective and requires a lot of energy due to steep terrain and far from road access. This research aims to make a portable body type milking machine that can help farmers in the milking process. The data obtained were processed in a qualitative descriptive manner. The results showed that: (1) the stages of the study began with data collection, machine design, machine manufacturing, and performance testing; (2) performance test results show that the machine is very helpful for cattle farmers in the milk milking process