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All Journal FLYWHEEL : Jurnal Teknik Mesin Untirta Mesin Trends in Mechanical Engineering Research
Kurnia Nugraha
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Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Transportation

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Pengaruh Perlakuan Panas Terhadap Peningkatan Sifat Mekanik Paduan Besi Tuang Putih Dengan Cr-Ni Untuk Bilah Shot Blasting Hasanudin Gufron Fachrudin; Hamdan Akbar Notonegoro; Greida Frista; Yusvardi Yusuf; Erny Listijorini; Rina Lusiani; Kurnia Nugraha; Aswata Aswata
FLYWHEEL : Jurnal Teknik Mesin Untirta Volume III Nomor 2, Oktober 2017
Publisher : Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (980.011 KB) | DOI: 10.36055/fwl.v2i1.2651

Abstract

Bilah sebagai salah satu komponen yang berfungsi sebagai pelontar bola-bola logam dalam mesin shot blasting, sebagian besar diimpor dari luar negeri. Namun demikian, masih ditemukan kegagalan ataupun umur pakai yang pendek. Hal ini disebabkan bilah-bilah tersebut rentan terhadap gesekan dan benturan akibat kondisi operasional. Untuk itu, dalam penelitian ini dikembangkan bahan bilah berbasis paduan besi tuang putih dengan Cr-Ni. Peningkatan sifat mekaniknya dilakukan melalui variasi perlakuan panas, baik hardening (900–1000 oC) maupun tempering (400 oC, 500 oC, dan 1000 oC). Dari penelitian ini didapati bahwa nilai optimal kenaikan sifat mekanik, baik kekerasan dan ketahanan gesek, dihasilkan melalui hardening pada suhu 1000 oC yang dilanjutkan tempering pada suhu 400 oC. Pada kondisi tersebut, struktur fasa yang terbentuk berupa ferit acicular, perlite dan karbida berbentuk bulat-bulat kecil. Struktur fasa ini membuat sifat mekanik sampel menjadi lebih keras dan lebih tahan terhadap gerusan saat terjadi gesekan.
KAJI NUMERIK PENGARUH CACAT RETAK MELINTANG PADA POROS TERHADAP PERILAKU DINAMIK SISTEM POROS ROTOR Bagus Budiwantoro; Ojo Kurdi; Kurnia Nugraha
Mesin Vol. 16 No. 3 (2001)
Publisher : Mesin

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Abstract

The stiffness of a cracked shaft changes due to the position of the crack. The problem is how to make a general equation of motion that can be used for all crack positions, so frequency response resulted represents the real frequency response of the cracked shaft. The cracked shaft modelling uses the moment inertia of cracked shaft at various crack positions is the first step. The second step is determining frequency response of significant crack position. The third step is determining the equivalent moment inertia of a cracked shaft that represents the condition of the crack. Next, by using Rayleight-Ritz Method and equivalent moment inertia of cracked shaft, the equation of motion that represents condition of cracked shaft can be determined. The results of this equation are Campbell Diagram and response to force excitation due to mass unbalance and asynchronous force. Dynamic behaviors of system are presented for three positions of crack, namely 0o, 90o, and average position. 0o position is the significant position, 90o position gives the smallest change to dynamic behavior of cracked shaft and the average position represents the condition of the cracked shaft.
EFFECT OF PLATE THICKNESS AND ROLL GAP ON THE GEOMETRIC QUALITY OF ROLLING PRODUCTS Hendra Hendra; Ahmad Fauzan; Zuliantoni Zuliantoni; Aswata Aswata; Kurnia Nugraha; Hermiyetti Hermiyetti; Hernadewita Hernadewita
Trends in Mechanical Engineering Research Vol 1, No 1 (2023): June
Publisher : Department of Mechanical Engineering, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/timer.v1i1.20496

Abstract

The gacorslot folding gate is a middle frame flanked by cross bars on the back of the shop door which has a higher level of strength than the body of the door and has better security. The U folding profile is made by a plastic deformation rolling process in which the plate is passed between the pressing roll and the sliding roll. Flat plates are used from the base material of metal plates with varying plate thickness where the metal forming process uses a cold working process. Factors that affect the results of rolling are roll dimensions, machine capacity, roll pressure lever settings and others. The thickness of the plate that can be rolled by the machine, the amount of force exerted on the roll gap, the evenness of the roll surface both vertically and horizontally and the alignment of the roll gap. The thicker the material with a large pressure spacing can affect the forming process so that it enlarges the largest angular deviation of 0.761 mm at a pressure spacing of 0.0 mm. A thicker material with a large pitch can enlarge the wing opening so that both wings bend imperfectly making the height deviation increase by 18.58 mm at a pitch of 0.0 mm. Thinner material with a large press distance at the start of the roll affects the flange width so that the rolling force exerted on the contact gap between the roll and the workpiece side is unbalanced. Get the largest size b- (8.030 mm) 0.0 mm pressure distance and b+ (7.843) 0.15 mm pressure distance. 
Co-Authors Ahmad Fauzan Aswata Aswata Aswata Aswata Bagus Budiwantoro Erny Listijorini Greida Frista Hamdan Akbar Notonegoro Hasanudin Gufron Fachrudin Hendra Hendra Hermiyetti Hernadewita Ojo Kurdi Rina Lusiani Yusvardi Yusuf Zuliantoni, Zuliantoni