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Unung Lesmanah
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Pengaruh Variasi Kuat Arus pada Proses Elektroplating Alumunium terhadap Ketebalan dan Kekerasan Lapisan Syaifulloh Ahmad; Unung Lesmanah; Ena Marlina
Jurnal Teknik Mesin Vol. 18 No. 1 (2022)
Publisher : UNIVERSITAS ISLAM MALANG

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Abstract

Penelitian ini dilakukan dengan tujuan untuk mengetahui pengaruh arus listrik pada proses pelapisan elektroplating terhadap ketebalan dan kekerasan lapisan alumunium alloy 6061, dengan memvariasikan kuat arus 10, 20 dan 30 Ampere, tegangan 12 Volt dan waktu 60 menit. Hasil penelitian mendapatkan nilai ketebalan lapisan tertinggi terjadi pada proses elektroplating dengan lapisan nikel menggunakan kuat arus 30 A, tegangan 12 Volt dan waktu pencelupan 60 menit dengan nilai 22,531 𝜇m dan nilai kekerasan tertinggi di dapat pada proses elektroplating nikel ini menggunakan kuat arus 30 A, tegangan 12 Volt dan waktu pencelupan 60 menit dengan nilai 675,7 VHN. Artinya semakin besar kuat arus yang digunakan maka ketebalan dan kekerasan lapisan akan semakin tinggi. Kata Kunci: Kuat Arus, Elektroplating, Alumunium Alloy 6061, Ketebalan, Kekerasan
PENGARUH VARIASI WAKTU PENCELUPAN PLAT BAJA A36 TERHADAP KETEBALAN dan KEKERASAN PELAPISAN ZN pada PROSES ELEKTROPLATING Miftachul Tofani; Unung Lesmanah; Mochammad Basjir
Jurnal Teknik Mesin Vol. 18 No. 1 (2022)
Publisher : UNIVERSITAS ISLAM MALANG

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Banyak sektor industri yang menggunakan lapisan logam krom dan hampir semua manusia menggunakan alat yang terbuat dari logam karena baja A36 banyak digunakan diberbagai komponen sepeda motor, mobil, furniture, dan kontruksi bangunan/jembatan tetapi mudah terkorosi juga berwarna abu-abu, tidak menarik, untuk menghambat korosi serta mempercantik tampilan dilakukan pelapisan. Metode ini menggunakan proses electroplating  dengan pelapisan anoda ZN dan material yang dilapisi adalah baja A36, dan memvariasikan lama waktu pencelupan pada proses electroplating yaitu antara 60, 90, dan 120 menit setelah dilapisi di uji ketebalan dan kekerasan lapisan. Dari hasil penelitian ini menghasilkan nilai ketebalan terkecil pada pelapisan anoda zn pada variasi lama waktu pencelupan 60 menit sebesar 9,7 μm, sedangkan nilai ketebalan tertinggi pada variasi lama waktu pencelupan 120 menit sebesar 17,25 μm. Dan nilai kekerasan terkecil terdapat pada variasi lama waktu pencelupan 60 menit sebesar 265,7 μm, sedangkan nilai kekerasan tertinggi pada variasi lama waktu pencelupan 120 menit sebesar 498,1 μm. Kata Kunci : Ketebalan & kekerasan lapisan, electroplating, Zinc, Baja A36.
ANALISIS VARIASI KUAT ARUS TERHADAP NILAI KETEBALAN DAN KEKERASAN LAPISAN ZN PADA PROSES ELEKTROPLATING BAJA A36 Troy Febrianto; Unung Lesmanah; Mochammad Basjir
Jurnal Teknik Mesin Vol. 18 No. 1 (2022)
Publisher : UNIVERSITAS ISLAM MALANG

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Di era yang berkembang pada saat ini, masyarakat ataupun pabrik mengalami kemajuan yang signifikan. Banyak sekali barang yang dibuat manusia, untuk tujuan kebutuhan sehari – hari ataupun untuk kebutuhan produksi. dinama barang itu banyak yang dibuat dari logam/baja. Dari macam-macam jenis logam, logam juga memiliki kekurangan yang sangat umum yaitu rentan terhadap korosi. Maka perlu dilakukan pelapisan untuk meningkatkan daya Tarik, dikarenakan logam setelah dilapisi akan terlihat lebih indah, mengkilat, dan memiliki tingkat keawetan yang tinggi.. Pada penelitian ini menggunakan baja A36, dimana baja A36 termasuk jenis baja karbon rendah yang memiliki kekerasan rendah. Tujuan penelitian ini adalah untuk mengetahui pengaruh perubahan variasi arus terhadap ketebalan dan kekerasan lapisan zinc atau seng selama proses electroplating.Pada penelitian ini menggunakan metode pelapisan electroplating dengan pelapisnya yaitu zinc. Variasi kuat arus pelapisan yaitu 5 A, 15 A, 25 A, dengan waktu pelapisan 60 menit, didapatkan hasil pengujian ketebalan menggunakan Coating Thickness Gauge, hasil pengujian ketebalan tertinggi didapat pada variasi arus 25 A yaitu 3,9 μm, Sedangkan hasil ketebalan ter rendah di dapat pada arus 5 A mendapatkan nilai ketebalan 1,8 μm. Sedangkan hasil uji kekerasan menggunakan Hardness Vickers didapatkan nilai kekerasan tertinggi dengan variasi kuat arus 25 A dengan nilai kekerasan 528,2 HV, sedangkan nilai kekerasan terendah didapat pada kuat arus 5 A dengan nilai kekerasan 400,1 HV. Kesimpulan pada penelitian ini menunjukkan bahwa semakin tinggi arus pada proses pelapisan maka semakin besar ketebalan dan kekerasan semakin tinggiKata kunci: Baja A36, Electropating, Variasi Kuat Arus, Zinc, Uji kekerasan, Uji ketebalan
ANALISI MIKROSTRUKTUR DAN KEKERASAN PADA PENGECORAN ALUMUNIUM PADUAN MAGNESIUM Ahmad Nidhom Uddin; Unung Lesmanah; Mochammad Basjir
Jurnal Teknik Mesin Vol. 18 No. 1 (2022)
Publisher : UNIVERSITAS ISLAM MALANG

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ABSTRACTProses pengecoran logam adalah proses pembuatan produk dimana logam terlebih dahulu dilebur ke dalam tungku peleburan kemudian dituangkan ke dalam cetakan dimana polanya terlebih dahulu dibuat, sampai logam cair tersebut memadat kemudian dikeluarkan dari cetakan. Kemudian proses pengecoran terutama memiliki tiga bagian, satu adalah proses pembuatan cetakan, yang lainnya adalah proses pembuatan bahan inti, dan yang ketiga adalah proses pengecoran logam. Hasil yang diperoleh dari berbagai unsur salah satunya adalah uji mikrostruktur, dengan penambahan magnesium (Mg) lebih banyak.Hasil analisis komputasi coran aluminium dan paduan magnesium untuk mencari nilai kekerasan magnesium yang ditentukan untuk masing-masing magnesium oleh media ekstraksi ketapang. Nilai kekerasannya adalah 236,5 HV untuk campuran 5% Mg pada media ekstraksi ketapang, 318,2 HV untuk campuran 10% pada media ekstraksi Ketapang, dan 323,2 HV untuk campuran 15% Mg pada media ekstraksi ketapang. Dari hasil penelitian ini, nilai kekerasan tertinggi diperoleh pada paduan magnesium 15%, sehingga dapat disimpulkan bahwa semakin besar perubahan persentase penambahan magnesium (Mg) dan media pendingin pada pengecoran aluminium, semakin keras Kekerasan dan bentuk senyawa intermetalik yang mengarah pada peningkatan sifat mekanik. Kata kunci: aluminium, magnesium, proses pengecoran, air laut, Ekstra Daun Ketapang, larutan HCL, kekerasan Vickers, struktur mikroABSTRACTThe metal casting process is a product manufacturing process that begins with melting the metal into a smelting furnace and then pouring it into a mold that is first made into a pattern,until the molten metal freezes and then is removed from the mold. There are three main parts to the casting process, the first is the mold making process, the second is the core manufacturing process and the third is the metal casting process. The results obtained from the many kinds of alloying elements above, one of which is from the microstructure testing conducted by concluding that the more magnesium (Mg) is added.The results of the analysis and calculation of aluminum casting with magnesium alloy, to find the hardness value of magnesium alloy, the ketapang extract media was determined for each magnesium alloy. for a mixture of 5% Mg in ketapang extract media, the hardness value was 236.5 HV, for a 10% mixture in Ketapang extract media a hardness value was 318.2 HV and for a mixture of 15% Mg in ketapang extract media a hardness value was 323.2 HV. From the results of this study, the highest hardness value was obtained in the Mg alloy of 15%, so it can be concluded that the more the percentage of addition of Magnesium (Mg) and the variation of the cooling medium in aluminum casting will produce a harder hardness and also form intermetallic compounds that cause mechanical properties increase.Keywords :    Aluminum, Magnesium,Casting Process,Seawater, Ketapang Leaf Extract, HCL Solution, Vikers Hardness, Microstructure
Pengaruh Variasi Media Pendingin Terhadap Kekerasan dan Mikrostruktur Pada Pengecoran Aluminium 6061 Sigit Kristiadi; Unung Lesmanah; Artono Raharjo
RING ME Vol 2 No 2 (2022): RING Mechanical Engineering
Publisher : Universitas Islam Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33474/rm.v2i2.19906

Abstract

The casting and the cooling process on the metal can affect the mechanical properties and physical properties that are formed. Changes in metal properties are influenced by the type and cooling medium in the metal cooling process. This study aims to determine the effect of different cooling media (Water, Dromus, and Coolant radiator) in the Quenching process on the hardness and microstructure of Aluminum 6061 which has passed the casting stage. It can be concluded that the variations in the cooling media used affect the different levels of hardness and microstructure of the test specimens. From the test results, it was found that the Water cooling media specimen had the highest level of hardness, the smallest grain size, and the amount of α-Al matrix formed was lower than the Dromus cooling media specimen. The test object with Dromus cooling medium has a higher hardness level, smaller grain size, and the amount of α-Al matrix formed is lower than the Coolant radiator coolant media test object which has the lowest hardness level, the largest grain size, and the amount of α-Al matrix the most
Analisis Kekuatan Sambungan Las TIG dengan Variasi Arus Listrik pada Penyanggah Tabung Pasteurisasi Berbahan Stainless Steel 201 Alkamaluddin; Unung Lesmanah; Mochammad Basjir
RING ME Vol 2 No 2 (2022): RING Mechanical Engineering
Publisher : Universitas Islam Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33474/rm.v2i2.19921

Abstract

Welding (Welding) is a metal joining procedure by softening some of the base metal and filler metal without regard to additional metal and produces a persistent metal. Welding has many endless types depending on the cycle and maintenance. One of the welding processes is electric curve welding which is separated into 2 classifications, namely the consumable cathode and the non-consumable terminal. Welding this time using Gas Tungsten Bend Welding or better known as Tungsten Idle Gas (TIG). TIG gas is one type of electric circle segment welding with argon gas protection. This welding is widely applied to processed steel, aluminum, responsive metals such as magnesium and titanium. This study utilizes variations in electric currents of 100 A and 130 A. From the results of the examination that has been carried out, the strength of the TIG welding joints with variations in electric current is obtained on the sanitary machine supporting cylinders made of 201 tempered steel. J/mm2, at 130 An electricity it is 5.140 J/mm2 and at 160 An electricity it is 3.676 J/mm2. In this way the best value of the effect test is at 100 A.
Analisis Pengaruh Variasi Heat Treatment Material Aluminium Alloy 6063 Terhadap Laju Korosi Asri Dilomo; Priyagung Hartono; Unung Lesmanah
RING ME Vol 4 No 1 (2024): RING Mechanical Engineering
Publisher : Universitas Islam Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33474/rm.v4i1.21533

Abstract

Corrosion is material damage caused by comprehensive aspects, destruction or damage to the material due to reactions with its environment. Corrosion is a damage to materials (generally metals), the corrosion process occurs not only in the form of chemical reactions, but also electrochemical reactions. In the industrial world, the use of engineering materials is one of the most important for the application of various kinds of equipment, the use of alumininium alloy material which is very widely applied, especially in the development of the automotive sector that requires lightweight materials and is not susceptible to damage caused by corrosion, improving material properties by changing the atomic structure of the material by heat treatment of materials using the precipitation hardening method. Corrosion analysis on aluminum alloy 6063 material using weight loss method according to ASTM G31-72 standard, reweighing material after corrosion on pure seawater media to determine material weight loss caused by seawater
Analisis Pengendalian Kualitas Produk Tiang Listrik dengan Metode Seven Tools dan FMEA (Failure Mode Effect Analysis) di PT XY Basjir, Mochammad; Kresna Agung Yudhistira; Unung Lesmanah; Nur Robbi; Suhartini
Journal of Research and Technology Vol. 10 No. 2 (2024): JRT Volume 10 No 2 Des 2024
Publisher : 2477 - 6165

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55732/jrt.v10i2.1473

Abstract

PT XY, a precast concrete manufacturer, especially for electric poles, faces product quality problems in the form of defects, which harm quality, management, and production costs. This study aims to identify the root causes of defects and provide improvement solutions using the Seven Tools and Failure Mode and Effect Analysis (FMEA) methods. FMEA is used to identify potential and risk of failure and to formulate priority improvement actions. The results of the study showed three main types of defects: porous fins (53.53%), skin sticking (39.56%), and mottled (6.92%). The causal factors include methods, materials, humans, and machines/tools. FMEA analysis produces the highest Risk Priority Number (RPN) for porous fins (192) caused by imprecise molds (machine/tool ​​factors). The recommended solution is to inspect and repair the moulds periodically. Skin sticking defects have an RPN of 210, caused by poor oil quality (material factors); replacing the oil with an oil-based type is the solution. Mottled defects with an RPN of 144 are caused by the low slump of the casting mixture; the solution is to guide the mixing of raw materials according to standards. This study provides specific recommendations to reduce defects in electric pole products at PT XY, focusing on mould improvement, replacement of oil types, and standardization of raw material mixing.
ANALISIS NILAI OVERALL EQUIPMENT EFFECTIVENESS PADA MESIN PACKER FOCKE FX 2 DI PT ABC Reditya Chiesa Ramadhan; Unung Lesmanah; Mochammad Basjir; Nur Robbi; Rangga Ega Santoso
RING ME Vol 5 No 1 (2025): RING Mechanical Engineering
Publisher : Universitas Islam Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33474/rme.v5i1.23696

Abstract

This study carried out to overcome the performance and efficiency problems of the Packer Focke FX 2 machine at PT. ABC. The study uses descriptive quantitatie approach to analyze Overall Equipment Efetiveness (OEE) value. The resultof OEE value is analyzed by Six Big Losses method to find the losses factors and used the failure mode Effect Analysis (FMEA) method with fishbone diagram to find its root causes and provide suggestion for improvement. The result of the study is OEE value from the period of June 2024 to Ugust 2024, which was 43,4 %. This result is lower than the world standart OEE of 85 %. These result are caused by high value of idling and minor stoppage losses at 15,84% and breakdown losses at 13,46%. The root of problems was found using FMEA method with RPN value of 288, which is failure in blank feeding process with type of failure mode is blank material jamming in blank track area because of spray glue jet was not function optimally. So that, the recommendation of improvements that are given are related to preventive method, spare part management, and employee competency
Analisis Pengendalian Kualitas Produk Tiang Listrik dengan Metode Seven Tools dan FMEA (Failure Mode Effect Analysis) di PT XY Basjir, Mochammad; Kresna Agung Yudhistira; Unung Lesmanah; Nur Robbi; Suhartini
Journal of Research and Technology Vol. 10 No. 2 (2024): JRT Volume 10 No 2 Des 2024
Publisher : 2477 - 6165

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55732/jrt.v10i2.1473

Abstract

PT XY, a precast concrete manufacturer, especially for electric poles, faces product quality problems in the form of defects, which harm quality, management, and production costs. This study aims to identify the root causes of defects and provide improvement solutions using the Seven Tools and Failure Mode and Effect Analysis (FMEA) methods. FMEA is used to identify potential and risk of failure and to formulate priority improvement actions. The results of the study showed three main types of defects: porous fins (53.53%), skin sticking (39.56%), and mottled (6.92%). The causal factors include methods, materials, humans, and machines/tools. FMEA analysis produces the highest Risk Priority Number (RPN) for porous fins (192) caused by imprecise molds (machine/tool ​​factors). The recommended solution is to inspect and repair the moulds periodically. Skin sticking defects have an RPN of 210, caused by poor oil quality (material factors); replacing the oil with an oil-based type is the solution. Mottled defects with an RPN of 144 are caused by the low slump of the casting mixture; the solution is to guide the mixing of raw materials according to standards. This study provides specific recommendations to reduce defects in electric pole products at PT XY, focusing on mould improvement, replacement of oil types, and standardization of raw material mixing.
Co-Authors Ahmad Nidhom Uddin Alkamaluddin Artono Raharjo Asri Dilomo Basjir, Mochammad Ena Marlina Kresna Agung Yudhistira Miftachul Tofani Nur Robbi Priyagung Hartono Rangga Ega Santoso Reditya Chiesa Ramadhan Sigit Kristiadi Suhartini Syaifulloh Ahmad Troy Febrianto