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ANALISIS PERENCANAAN PERAWATAN SPINDLE MOULDER DENGAN METODE RELIABILITY CENTERED MAINTENANCE (RCM) DI PT. ROMI VIOLETA
Full text linkIn a furniture company, there are several production machines that are used and in the process are interconnected. The production machines used often experience downtime or machine failure. One of which is the spindle moulder machine, it is a cutting machine used to cut wood with various profiles as needed. Damage to this machine can cause the production process to stop, so that downtime will increase and the production target that has been set will be reduced. To maintain the working condition of the machine so that it can last a long time and run optimally, the initial step is in the form of scheduling maintenance. RCM is a strategy to optimize the company's asset maintenance program so that it can operate effectively. This research method uses quantitative analysis conducted on the spindle moulder machine and qualitative analysis includes FMEA and RCM II Decision Worksheet which will be used as references to identify component failures and determine appropriate maintenance actions. The research results, the availability value for the spindle bearing component is 99.72%, the motor component is 99.78%, and the v belt component is 99.77%, so the average availability value is 99.76%. The value of downtime after preventive maintenance using the RCM method on the spindle moulder machine is 43.54 hours with a decrease in machine downtime of 30.96 hours (41.55%)
ANALISIS KERUSAKAN MESIN GEMINI FICEP G25 SP CNC MENGUNAKAN METODE FAILURE MODE EFFECT ANALYSIS (FMEA)
Full text linkThe rapid development of the manufacturing industry requires companies to always produce high quality and fully functional products. However, when the production process does not always run, there should be problems encountered, such as the machine factor which often breaks down and even shuts down completely, causing production disruption. One of the important factors in the successful implementation of Failure Mode Effect Analysis (FMEA) is to interpret before, the process takes place and not after it occurs. To support the implementation of Failure Mode Effect Analysis in the field of maintenance, an effort is needed to improve the state of the equipment. So, in this study, this method will be applied to the maintenance of the Gemini Ficep G25 CNC machine. The result can be assumed to be the primary problem in damage. The trouble that must be prioritized first are the plasma doesn’t run, the force on the engine drive does not move, the dust collector does not work and the internal and external coolants water don’t come out
ANALISIS KINERJA MESIN AMG CNC PLATE CUTTING MENGGUNAKAN METODE OEE (OVERALL EQUIPMENT EFFECTIVENESS)
Full text linkIn the industrial world, technology is an important thing that can help improve the quality of the industry. Every company that uses technology definitely needs an adequate maintenance system for tools and machines. The purpose of maintenance is to prevent unexpected machine breakdowns that can result in the production process stopping, endangering worker safety and increasing machine repair costs. One of the machines that are often used in the production process at PT XYZ is the AMG CNC plate cutting machine. Therefore, one method to determine the effectiveness of a cutting machine is Overall Equipment Effectiveness (OEE). Overall Equipment Effectiveness is a measurement made on performance related to the availability of process productivity and quality. As a result, by applying the OEE (Overall Equipment Effectiveness) method for performance analysis of the AMG CNC plate cutting machine, we can find out the value for availability of 91%, performance efficiency of 96%, and rate of quality product of 99%, the measurement results of the AMG CNC plate machine cutting in January 2021 using the OEE method of 86% which has passed the value of the OEE world standard of 85%. the value of the six big losses obtained is the breakdown loss value of 1.8%, the set up and adjustment value of 10%, the idle and minor stoppage value of 3%, the value of reduce speed losses of 5.3%, the value of process defect losses of 1 ,1%, the value of reduce yield losses is 0.06%
ANALISIS UNJUK KERJA COOLING TOWER INDUCED DRAFT COUNTER FLOW DENGAN BAHAN PENGISI ASBES
Full text linkIndustrial development is one of the economic components that influences national economic growth. Increased industrial growth is also aimed at realizing national goals for the welfare of society. In the industrial process, the machine generates heat as a side effect of the machine's work, so it requires a cooling system for its continued work. The facilities used by the industry to overcome these problems are by using cooling towers. One of the factors that influence the cooling tower performance is the filler. Asbestos is a material that has a thin and corrugated sheet shape. This material is made of the mineral silica and fine fibers. Asbestos material has many benefits and roles in industrial activities. The purpose of this study was to determine the effect of asbestos filler on cooling tower performance induced draft counter flow on the effect of variations in initial water temperature and air velocity, and the effect of effectiveness, water-air ratio, cooling capacity, evaporation loss and L / G value. This research on the performance of cooling towers with asbestos fillers obtained a higher value of effectiveness and cooling capacity than cooling towers without using fillers. This is evidenced by the highest value of effectiveness obtained by cooling towers using fillers of 83.26%, while the highest value for cooling towers without using fillers is 80.24%. The highest value of cooling capacity in a cooling tower using filler material is 10.34 kJ / s, while the highest value for a cooling tower without using a filler is 9.70 kJ / s.
Keywords: Asbestos, Cooling tower, Industr
KARAKTERISTIK KEBULATAN TERHADAP PARAMETER PROSES PEMBUBUTAN PADA MATERIAL ST 42 MENGGUNAKAN METODE TAGUCHI DAN ANOVA
Full text linkThis research is about the roundness characteristics of the turning process parameters on St 42 material using the Taguchi and ANOVA (Analysis of Variance) methods. A cylindrical product requires a good roundness value to ensure its quality. One of the factors that determine the quality of these products is the machining process parameters. In this study, optimization of the turning process parameters using the Taguchi and ANOVA methods was carried out on the roundness characteristics of the workpiece. The workpiece used is Steel St 42. The lathe used is the Krisbow Precision Gear Head Machine 410X1000MM. After data analysis using the Taguchi method, the parameters with the optimum roundness value of 7.385 µm were 510 rpm spindle rotation, 1mm depth of cut, and coolant opening valve. The results of the ANOVA analysis show the percent contribution of each parameter, respectively, as follows: spindle rotation 26.97%, depth of cut 24.82%, and coolant 38.63%
IDENTIFIKASI SURFACE RUBBER COVER UNIT INSERT MACHINE BILLING STATEMENT UNTUK MEMINIMALISIR LAJU KEGAGALAN
No full textA rubber cover flyerroll on an insert machine that has been operating for 3600 hours and is damaged, so an analysis is needed to determine the cause of the damage and a process to overcome the damage and the same failure occurs in the future. This flyer roll functions as a billing statement folder before being inserted into an envelope with dimensions of 28 mm (OD) x 284 mm (L). To find out the cause of the damage, several tests were carried out, namely destructive testing and chemical composition testing. Physical tests carried out include hardness test, tensile strength test, modulus test, elongation break test, density test, and abrasion resistance test. resistance test) and in this study a chemical composition test was conducted. From the test results, it can be seen that the hardness value is still within the tolerance limit, which is 94 shore A with a tensile strength value of 31.7 N/mm2 and the results of the chemical composition are dominated by polyurethane rubber at 62.9% and polystar at 23%. So from the tests that have been carried out, it can be concluded that the cause of the damage that occurs to the rubber cover flyer roll is caused by improper maintenance methods, machine maintenance that is not carried out and standard operational procedures (SOPs) that are not carried out according to the recommended maintenance proces
ANALISIS GRAFIS GERAKAN SENDI TERHADAP POROS VERTIKAL TULANG BELAKANG PENARI BAPANG MALANGAN
Full text linkInjuries in dancing activities can occur while practicing or during performance. Repetitive movements can be a major cause of injury when dancing. One of the injuries that can be fatal is spinal cord injury. The clinical manifestations of injury to the spine arise based on the location of the trauma. This study aims to identify potential movements that can cause spinal cord injury from the Bapang Malangan Dance. This potential is viewed from the movements that have a rotational effect on the spinal cord. The research was conducted by imitating several dance movements that were considered to have the potential to cause rotational motion in the spine. The measurement results of the spine rotational angle are used as the basis for carrying out kinematic and dynamic analysis. The degree of potential injury arising from movement is referred to at the normal allowable angle. From the results of the study, it is known that the area of ​​the neck segment from the spinal line of Bapang Malangan dancers is a potentially injury critical area. This is related to the rotation angle that occurs (50-60o) exceeds the maximum limit of normal rotation (45o). The load that works at the point of rotation is the weight of the head which act as pendulum with a combination of compressive effects. The development of research can be directed to the dynamic effects of dance movements, focusing on the study of modes of motion 2 that produce rotational changes in the entire spinal line, studying the combined effects of other body parts, and considering the dancer's skill
PENGARUH TEMPERATURE, HOLDING TIME, DAN PENAMBAHAN Sn TERHADAP CACAT SHRINKAGE PADA PROSES SINTERING METAL INJECTION MOLDING AL-PP
Full text linkMetal injection molding (MIM) is a relatively recent technological process used in the powder metallurgy industry, which is highly efficient and useful for the manufacture of large quantities of small and complex metal components. MIM consists of four basic steps consisting of mixing, injection molding, debinding, and sintering. Sintering to compact and increase the strength of metal powders and experience shrinkage (shrinkage). The purpose of this study was to determine the optimal combination of the MIM sintering process for the proportion of shrinkage defects by adding parameters Sn (%), temperature (℃), and holding time (hours). This study used an experimental design with the Taguchi method. The contribution factor obtained that the addition of the Sn parameter did not have a significant effect on the shrinkage of 14.48%, the temperature parameter had a significant effect on the shrinkage proportion of 68.92%, and the holding time parameter did not have a significant effect on the proportion of depreciation with a percentage of 6.27%. From the results, the optimal combination is the addition of Sn at level 3 (2%), the temperature at level 1 (450 ℃), and holding time at level 1 (1 hour)
SIMULASI PENGARUH LUAS PERMUKAAN ELEKTRODA TERHADAP TEGANGAN DAN KONSENTRASI PERMUKAAN ELEKTRODA PADA LEAD ACID REDOX FLOW BATTERY
Full text linkEnergy storage systems (ESS) with large storage capabilities, easy made, and low cost are in high demand. Dynamic lead acid battery (DLAB) as a breakthrough design compared conventional lead acid batteries offers a solution to these problems. Two Dimensional (2D) DLAB simulations with surface area variations of 8 cm2, 12 cm2, 16 cm2 and 20 cm2 were successfully build using the principle of tertiary current distribution and Nerst-Planck Interface. The results for one cycle charge-discharge test showed that the increase in surface area succeeded in increasing the final charging voltage with a value of 2.16 V; 2, 21 V; 2.30 V and 2.32 V and increase the initial discharging voltage by a value of 1.58 V; 1.59 V; 1.60 V and 1.62 V respectively but did not affect the electrode surface concentration. Dynamic lead acid battery has high energy efficiency of 70.6% -71.5%