JURNAL MESIN TEKNOLOGI
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IDENTIFICATION OF POTENTIAL HAZARDS ON PRODUCTION MACHINES WITH HAZOPS AND FISHBONE DIAGRAM IN PT. SILINDER KONVERTER INTERNASIONAL
Full text linkPT. Silinder Konverter Internasional is a company in the field of Rotogravure Cylinders. The company is a chemical sector industry and has only been running for about 2 years, for that the company needs to pay attention to the issues of Occupational Safety and Health because this greatly affects the company's productivity. The purpose of this study was to identify the factors causing occupational safety and health hazards to avoid work accidents at PT. Silinder Konverter Internasional. From the results of the research using the Hazards Operability Study (HAZOPS) method, there was 38 potential (40%) chemical potential hazards, 28 potential (29.47%) overwritten materials, 14 potential scratches (14.73%), 12 potential pinches (12.63%), and 3 potential noise levels (3.2%). Furthermore, the causal factors are searched with the fishbone diagram of the most potential hazard cases, namely chemical exposure, there are 12 factors. Followed by finding the dominant causative factors with the Nominal Group Technique (NGT) there are 7 factors. Then plan improvement of the 7 factors with the 5W + 1H method so that the level of risk of work accidents decreases
KARAKTERISTIK KEKUATAN TARIK DAN BENDING KOMPOSIT HYBRID SERAT DAN LIDI KELAPA
Full text linkPemanfaatan dan eksploitasi serat alam sebagai penguat pada material komposit terus dikembangkan dengan tujuan untuk mereduksi penggunaan serat sintetis yang berdampak pada masalah lingkungan. Penelitian ini bertujuan untuk mengkaji secara eksperimen potensi serat dan lidi kelapa untuk pembuatan material komposit hibrid sebagai salah satu material komposit berbasis serat alam yang memiliki kinerja untuk aplikasi industri furnitur. Metode yang digunakan adalah pembuatan komposit hibrid dengan menvariasikan volume serat dan lidi dengan matrik resin polyester. Sedangkan pengujian sifat mekanis secara berturt-turut mengacu pada standar pengujian ASTM D 638 dan ASTM D 790 untuk pengujian kekuatan tarik dan kekuatan bending. Hasil yang diperoleh menunjukan bahwa sifat kekuatan tarik dan bending paling optimal terjadi pada komposisi fraksi volume serat 50 %. Secara keseluruhan bahwa lidi kepala sebagai bahan penguat pada komposit hibrid belum memberikan penguatan berarti yang dikarenakan masih terdapat lapisan keras yang mengitari pada permukaan lidi walaupun telah dilakukan perlakuan alkali
THE EFFECT OF NICKEL ADDITION ON THE MECHANICAL PROPERTIES WELDED JOINTS OF LOW CARBON STEEL
No full textThe SMAW process is a commonly used metal joining method because it is very practical in its use, less cost, and easy availability of equipment. The SMAW process is also easy to operate and can be used in all welding positions. The problem that often occurs in steel construction lies in the welded joints. Therefore, it is necessary to increase the mechanical properties by adding nickel(Ni) to the welded joints. In this research, electrodes E 6013 and steel of ASTM A 36 was used. The tensile tests, bending tests, hardness tests, macrostructure, and microstructure will be carried out to see changes in mechanical properties. The addition of Ni contributes well to mechanical properties. The tensile strength, face bending, side bending, and hardness increased by 27.6%, 14.5%, 4.8%, and 20.9%, respectively. In the observation of the macrostructure, the porosity was not visible in all samples, while in the microstructure observation, ferrite and pearlite phases were formed in all samples
TENSILE BEHAVIOR OF SINGLE ELBOW ASSEMBLY WITH RIVETS ORIENTATION ON JUTE/EPOXY COMPOSITE
Full text linkThis experiment's purpose is to investigate the tension strength of the elbow joint with the variation of rivets position. The Joining was made based on jute woven fabric reinforced composite epoxy. The vacuum-assisted resin transfer molding process was employed to manufacture composites. In this joint two rivets were used in three orientations of positions such as diagonal (D), Vertical (V), and horizontal (H). In order to investigate the properties of a sample, the tensile loading was carried out. Then, the failure of samples based on the photographic method has analyzed. The test result shows that the tensile strength of joints with D orientation has the highest value compared with rivets on orientation V and H are 3.329 MPa, 2.946 MPa, dan 2.737 MPa, respectively. Additionally, the shear stress value of each rivets orientation on tangential states have D = 59.49 N/mm2, V = 47.46 N/mm2, and H = 45.35 N/mm2, respectively. It can be concluded that the rivet state orientation becomes an important factor for the tension strength of the tangential joint of the composites
COOLANT CIRCULATION IMPROVEMENT ON THE CHIP TUB OF THE MACHINE LNC OKUMA 0002 PT. KOMATSU UNDERCARRIAGE INDONESIA
Full text linkIn general, coolant is a cooling medium used to cool workpieces and cutting tools during the machining process. In PT Komatsu Undercariage Indonesia, the LNC OKUMA 0002 chip crankcase contained a lot of stagnant coolants. The factor that causes the coolant to stagnate is that the growl is wasted through the chip conveyor and the coolant is carried along with the growl to the chip. Changing the coolant fluid needs to be done in a certain phase because the use of the coolant for too long causes sand to accumulate. Excessive sand can close the cooling duct system. The quality of the coolant can deteriorate due to heat and a dirty environment. In addition, corrosion on the radiator can also result in the deposition of dirt on the coolant. When this happens, the engine overheats easily and triggers a stall. The repairs that have been carried out are examining and repairing the components of the coolant system by adding a coolant channel and a pump that functions to suck the coolant so that the coolant returns to the LNC OKUMA 0002 engine
OPTIMIZATION OF PROCESS PARAMETERS IN 3D PRINTING FDM BY USING THE TAGUCHI AND GREY RELATIONAL ANALYSIS METHODS
Full text linkThe 3D printing technology is one of the technologies that is developing currently. This machine can make products easily, quickly, and precisely. 3D printing is used to print models, prototypes/modeling, teaching aids for education, health support devices, product design, and many more in 3D shapes. Fused Deposition Modeling (FDM) is the most popular among others 3D printing techniques. In simple concept, it does not need maintenance regarding solvents or glue. The spare parts can be found easily and cheaply. In this research, we create objects by using Autodesk inventor that is called human denture. Then, it converted to G-Code using Simplyfy3D software version 4.1.2. The G-Code data is used in the 3D printer for making the product. We select parameters to print the product. In this study, we find the optimal parameters of the effect of shrinkage and hardness of the product. The 3 parameters are in this study namely; layer height, print speed, temperature print. The material of human denture is filament PLA +. The Taguchi method and Grey analysis are used to analyze the data result. The results of the analysis for optimal parameters are at Layer Height 0.15 mm, Print Speed 25 mm/s, and Print Temperature 210⁰C
UNJUK KERJA MESIN PENCACAH PELEPAH KELAPA SAWIT DENGAN SISTEM ROTARY
Full text linkPemanfaatan limbah pelepah sawit dapat diolah sebagai pakan ternak, kompos, pembuatan briket, dan bahan dasar panel komposit. Pemanfaatan limbah pelepah kelapa sawit untuk berbagai tujuan tersebut diproses dengan cara mencacahnya menjadi cacahan berukuran kecil. Proses pencacahan dengan menggunakan mesin pencacah memberikan kemudahan bagi petani dan mempercepat waktu pencacahan. Beberapa penelitian telah dilakukan pada proses pencacahan pelepah daun kelapa sawit dengan menggunakan motor penggerak yang berbeda-beda dan berbagai model pisau potong, daya motor, serta kecepatan putaran motor yang bervariasi dengan tujuan untuk mendapatkan kapasitas efektif mesin yang optimal. Metode perancangan yang digunakan dalam pembuatan mesin adalah metode Pahl dan Beitz, yaitu perencanaan, perancangan konsep produk, perancangan bentuk, dan perancangan detail. Parameter yang diamati dan diukur pada mesin adalah kapasitas efektif mesin, rendemen cacahan, dan ukuran panjang hasil cacahan. Uji coba dilakukan sebanyak tiga kali pengulangan dengan mencacah pelepah yang ditimbang masing-masing seberat 5 kg. Hasil uji coba terhadap mesin pencacah pelepah kelapa sawit sistem rotary menunjukkan bahwa kapasitas efektif mesin rata-rata adalah sebesar 244,06 kg/jam sehingga termasuk dalam katergori kelas A. Rendemen cacahan rata-rata pada mesin adalah sebesar 97 % dan ukuran rata-rata cacahan ≤ 50 mm adalah sebesar 89,5 % dan telah memenuhi syarat SNI 7580: 2010
THE EFFECT OF SOLUTION HEAT TREATMENT HOLDING TIME VARIATIONS ON THE MECHANICAL PROPERTIES OF ALUMINUM A-6061 BY THE TIG WELDING PROCESS
Full text linkAluminum and its alloys are metals that are widely used in the engineering field because its have advantages including good formability, relatively high tensile strength, corrosion resistance and a welding process for the joints. General structure, structures that have poor mechanical properties. To overcome this problem, the material that has been welded is heat treated or heat treated according to temperature and time management) which is suitable in addition to good mechanical properties as well as to reduce residual stresses. The purpose of this research is to determine the tensile strength and hardness value of welding joints of Aluminum 6061 with a variation of Holding Time 1, 2, 3 hours in the Solution Heat Treatment process with a temperature of 5000C. The results showed that based on the results of the tensile test, it showed that the holding time affected the value of the tensile strength and strain of the welding joint where the highest tensile test value was at a holding time of 1 hour, while the highest strain value was at a holding time of 2 hours. Then from the hardness test data, it shows that the heating duration or holding time affects the hardness value of the material both in the weld metal, HAZ, and base metal areas. In the weld metal area, the highest hardness value is at a holding time of 3 hours. The HAZ area has the highest hardness value at a holding time of 2 hours, while the base metal region has the highest hardness value at a holding time of 1 hour
EFFECT OF NICKEL ELECTROPLATING TIME ON CORRUGATED METAL GASKETS PERFORMANCE
Full text linkMetal gaskets is an alternative to asbestor gaskets, but it still have many weaknesses. The main focus of this research is to find the optimal electroplating time to prevent leakage.This research was started with forming the gasket material, and then followed by coating process. The methode that used in coating proses was electroplating with nickel solution. The gasket material used SUS 304 sheet with 1,5mm of thickness. Water pressure test was used to test leackage with 2 MPa, 4 MPa, 6 MPa, and 8 MPa presurre for 5 minute test duration. The result this research are (1) electroplating are effected by time, the longer time applied more nickel attached to the gasket, (2) the best performance on nickel electroplated gasket was on 32 minute and 45 second plating time, (3) electroplated nickel gasket performance was better than the original to prevent leakage from 2 to 8 MPa water pressure
PUMP AS TURBINES (PATS) DESIGN OPTIMIZATION AS A RENEWABLE ENERGY SOURCE ALTERNATIVE
Full text linkOne economical alternative to building a small-scale hydroelectric power plant is to use pumps as turbines, often referred to as PATs, which stands for Pump As Turbines. This research was conducted with an experimental method using a factorial experiment 22 After conducting research and data processing, Angle of Entry of Pump As Turbines and impeller tip angles Factors on turbines are equally influential to increase the speed of turning Pump As Turbines (PATs), but the variables the most influential in this study to increase the rotational speed of Pump As Turbines is the entry angle of PATs. Based on data processing to find the most influential variable using the Yates algorithm, if changing the PATs Entry Angle from 45° to 90° there will be an increase in Pump As Turbines rotational speed of 30.1 rpm while changing the impeller tip angles from 40° to 30° can only increase the Pump As Turbines rotational speed by 18.6 rpm. The alternator capacity that can be produced by Pump As Turbines is 100W, based on electrical power testing using a load of incandescent light bulbs. The electric power that can be generated by Pump As Turbines uses test samples at optimum conditions, namely the 90° Angle of Entry and the impeller tip angle 30° at the water pressure from the input pump 0.375 bar (g). The results of loading given using incandescent light bulbs with the power of 5 W, 10 W, 25 W, 40 W, and 100 W, there is the lowest voltage that is 194 V on a light bulb with 100 Watt power with alternator rotational speed of 855.7 rpm in the 3rd experiment