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The Effect Of Sinking Parameters To Optimize Response At Edm Of Aisi H13 Using Taguchi – Fuzzy Method Diah Kusuma Pratiwi
Journal of Mechanical Science and Engineering Vol 4, No 1 (2017): Journal of Mechanical Science and Engineering
Publisher : Universitas Sriwijaya

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Abstract

The development technology in today's manufacturing is very fast, the desire of the market will need products and components with complex shapes and a high level of accuracy as well as hardness material which has high strength. High degree of hardness and precision widely used non-conventional sinking of EDM. End cutting depth (CDE), the maximum rate of erosion material(REM) and rate of electrode wear (RWE) as well as minimal surface roughness (SR) is the performance of the process of machine sinking EDM to be achieved. Aims of a study conducted to determine the contribution of the process parameters in order to reduce the variation of response parameters simultaneously and determine the value of setting the appropriate parameter process. The parameters were varied current, on time, off time and machining voltage. This research used experimental design of Taguchi method with orthogonal matrix L16 44. Combination of Taguchi-Fuzzy is used as a method of optimization by experimenting as much as two times. Optimization results show the contribution of each parameter on all responses simultaneously is current at 41.35%, energy on time amounted to 37.90%, off time amounting to 10,11%and machining voltage by 5%. End cutting depth (CDE) with a specific target, the maximum rate of erosion material (REM), ), the rate of wear of the electrode (RWE) and the surface roughness (SR) are both derived parameter value of at least current, 15A the energy on time 300ìs, off time 5ìs and machining voltage of 12V.
The Influence of Matrix Banana Stem Fiber Volume Fraction Recycled Polypropylene (RPP) toward Bending Test Diah Pratiwi Kusuma; Hendri Chandra; Tumpal Ojahan Rajagukguk
Journal of Mechanical Science and Engineering Vol 1, No 1 (2013): Journal of Mechanical Science and Engineering
Publisher : Universitas Sriwijaya

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Abstract

ABSTRAKSerat alam telah terbukti sebagai material yang kuat, mampu untuk menggantikan serat sintetik sebagai penguat. Serat batang pisang kepok yang memiliki kekuatan tarik 68,44 MPa dengan bundalan rata-rata 0,698 mm salah satu serat yang memiliki potensi sebagai penguat untuk polymer material komposit. Pada material komposit bermatriks recycled polypropylene (RPP) berpenguat serat batang pisang kepok dapat menahan beban yang diterima material komposit. Sedangkan recycled polypropylene (RPP) sebagai pengikat serat batang pisang, bekerja menahan beban dan melindungi serat dari kerusakan.  Hasil pengujian yang paling optimal terdapat pada volume fraksi 35% fiber : 65% matriks dengan  tegangan bending 122,09 N/mm2, modulus elastisitas 2975 MPa, momen bending 126,59 N/mm2 dan tegangan lentur 64,34 MPa. Pada pengamatan SEM fraksi volume 35% filler : 65% matriks paling optimal karena adanya ikatan matriks dan serat menyatu dengan sempurna. Dari penelitian ini dapat disimpulkan bahwa pengaruh fraksi volume serat batang pisang kepok sebagai penguat (fiber) dan recycled polypropylene (RPP) sebagai pengikat (matriks) pada material komposit akan mempengaruhi kekuatan material komposit lebih kuat dan getas. Apabila ditinjau dari keseluruhan pengujian yang dilakukan maka fraksi volume yang paling optimal terdapat pada fraksi volume 35% filler : 65% matriks.
Mechanical Behavior of Medium Carbon Steel welded with SMAW And Corroded with Sea Water Diah Kusuma Pratiwi; Rasyidi Rasyidi
Journal of Mechanical Science and Engineering Vol 2, No 1 (2015): Journal of Mechanical Science and Engineering
Publisher : Universitas Sriwijaya

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Abstract

The problem of  metal corrosion is a very serious to be observed, especially the corrosion of medium carbon steel because it can reduce the economic value of the metal. Corrosion of carbon steel is influenced by the environmental conditions. This paper discusses the effect of the corrosion rate of medium carbon steel with SMAW welding and corrodes it with sea water during several hour. Electrodes of AWS A5.1E7016 type were used in the welding. The test results show that the medium carbon steel which was corroded with sea water has small weight loss. It seem that the weight loss has small influence on the mechanical behavior of the metal. For the welded medium carbon steel, the ultimate strength and surface hardness are smaller than the un-welded one. The microstructure of welded medium carbon steel has unsimilar structure with un-welded steel because it has about the same amount of ferlite, ferrite and martensite.
Aplikasi Multichart Diagram Dalam Desain Dan Manufaktur Tungku Pengecoran Kuningan (CuZn5) Menggunakan Bahan Bakar Briket Batubara Kalori Rendah Diah Kusuma Pratiwi
Jurnal Energi Dan Manufaktur Vol 7 No 1 (2014): April 2014
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

Abstrak : Sejak semakin mahalnya harga miyak bumi, sebagian besar industri kecil pengecoran logam tidakdapat bertahan karena biaya produksi yang semakin tinggi. Oleh karena itu dicari bahan bakaralternatif yang dapat menggantikan minyak dan gas dengan aman dan murah. Indonesia kayaakan batubara yang dalam pasar domestik dijual dalam bentuk briket batubara kalori rendah,oleh karena itu dilakukan desain untuk membuat tungku dengan bahan bakar ini. Proses desaindilakukan dengan mulai menghitung kalor yang dibutuhkan untuk melebur lagam, dalam hal inilogam yang akan dilebur adalah kuningan (CuZn5). Selanjutnya dilakukan pemilihan materialrefraktori untuk tungku yang dapat meminimalisir heat loss. Desain tungku pengecoran inidilakukan dengan menggunakan Multichart Diagram untuk effisiensi 40 % dan kapasitas 150 kgkuningan. Hasil Uji coba pengecoran dilapangan ternyata effisiensi tungku adalah 42%, lamapeleburan 3,5 jam.Kata kunci: Tungku pengecoran kuningan, briket batubara kalori rendah, mulichart diagramAbstract : Since the increasingly price of oil fuel, mostly small foundry industry can not survive due to thehigher production costs. Therefore searching for alternative fuels that can replace oil and gas safelyand inexpensively is promoted. Indonesia is rich in coal. In domestic market is sold in the form oflow-grade coal briquettes, therefore, is carried out the design to make furnace from this fuel. Thedesign process is done by beginning to calculate the heat needed to melt this alloy, in this case themetal to be melted is brass (CuZn5). Furthermore, the material selection for refractory furnace tominimize heat loss. This casting is done by using Multichart Diagram for 40% efficiency andcapacity of 150 kg brass. The test results during experiment obtained that efficiency is 42% in 3.5hours.Keywords: Furnace casting brass, low grade coal briquettes, multichart diagram
Analisis Kerusakan pada Bushing Apron Feeder abraham hutabarat; Nurhabibah Paramitha Eka Utami; Diah Kusuma Pratiwi
Jurnal Rekayasa Mesin Vol. 21 No. 2 (2021): Jurnal Rekayasa Mesin
Publisher : Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36706/jrm.v21i2.135

Abstract

The mining industry, especially coal mining, has a transportation and delivery process from one location to another. In the transportation process, there are usually obstacles caused by damage to components that can hinder the delivery process. One of the transportation equipment that often fails is the Apron Feeder. The work process that works continuously and repeated loading can damage the components on the Apron Feeder, one of the components that are often damaged is the Bushing. This study aims to analyze and determine the causes of damage to the Apron Feeder Bushing. The method of this research is by looking at the microstructure of the material, the hardness value of the material, seeing surface defects using a dye penetrant. With the results obtained, namely the number of defects in the form of scratches and porosity in good Bushings which can be the cause of damage to the Bushings and on damaged Bushings, there is martensite which shows that the Bushing is deformed and brittle which results in operations which can be the cause of damage to the Bushing and the results of XRF testing ( X-Ray Fluorescence) the composition of the material on the Bushing is made of AISI 4140 where there is a difference in composition in the original specification of the material, namely SCM 415.
Analisis Kerusakan pada Chain Link Apron Feeder Muhammad Surya Netrane Jagad Jagad; Nurhabibah Paramitha Eka Utami; Diah Kusuma Pratiwi
Jurnal Rekayasa Mesin Vol. 21 No. 2 (2021): Jurnal Rekayasa Mesin
Publisher : Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36706/jrm.v21i2.140

Abstract

The use of an Apron feeder with a carrying capacity of 90 tons with a motor with a power of 55 KW and engine speed of 1500 RPM as a container for coal unloading results in train cars and then distributed to a belt conveyor for 24 hours. Based on Standard Operating Procedures (SOP), the apron feeder can accommodate 8 train carriages for 120 minutes of unloading coal. This process initiates the possibility of fatigue in the Apron feeder component, namely the chain link. This study aims to determine the cause of chain link damage in terms of micro structure and strength to the value of hardness by using chain link analysis samples from PT. Acid Hill. Metallographic testing showed the presence of a banded structure in the new sample and the presence of a martensite phase in the damaged sample material, causing the material to become stronger but brittle.
Effect of Cooling Water Fraction Of Salt in Low Carbon Steel Properties Ahmadin Ahmadin; Diah kusuma pratiwi
Journal of Mechanical Science and Engineering Vol 2, No 1 (2015): Journal of Mechanical Science and Engineering
Publisher : Universitas Sriwijaya

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Abstract

Low carbon steel plate is widely used in the field of construction that require high hardness and ductility . One method used to increase the hardness of the low carbon steel plate that is by quenching water plus salt . The results showed that the quenching is based on a study of 10% salt water has a hardness of 168 VHN with σu = 33.62 , ε = 12 % and the lowest is 15 % salt water quenching VHN 101 σu = 30.30 and ε = 7.30% composition of the study above was 10 % salt solution in the cooling water will cause a decrease in mechanical properties .
Pengaruh Pencelupan Panas Terhadap Umur Patah dan Laju Korosi ASTM A36 Dalam Aluminium 7xxx Nurhabibah Paramitha Eka Utami; Diah Kusuma Pratiwi
Jurnal Rekayasa Mesin Vol. 20 No. 1 (2020): Jurnal Rekayasa Mesin
Publisher : Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36706/jrm.v21i1.213

Abstract

The hot dipping method is one of the most commonly chosen measures to protect material from corrosion. The main objective of this study was to analyze the effect of hot dipping time variation in Aluminum 7xxx on corrosion resistance and fracture life of ASTM A36 by conducting corrosion testing, weight reduction measurements and fatigue test analysis. Corrosion test results show that the specimen with a hot dipping time of 2 minutes has a lower corrosion rate and less weight reduction. Observation of age fracture in 1º stress level using Torsee's Torsion Repeated and Bending Fatigue Machine shows that specimens with hot dipping time of 2 minutes in Aluminum 7xxx have a higher fatigue toughness value than specimens with hot dipping time of 1 minute in Aluminum 7xxx and non hot dipping specimens.