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OPTIMASI TEMPERATUR INTERFACE PADA PELAPISAN ULANG NI-HARD 1 DENGAN METODE GRAVITY CASTING Hanaldi, Kus; Purwadi, Wiwik; Kurnia Nurzaenal, Friya
Jurnal Teknologi Terapan Vol 3, No 1 (2017): Jurnal Teknologi Terapan
Publisher : P3M Politeknik Negeri Indramayu

Grinding roll is one type of product made by the method of bimetallic casting. The product consists of two types of material that held together with foundry process. Grinding roll has two kinds of different material properties, outer grinding roll should be hard because it would destroy the mine or rock with material hardness at 9.3 mohs. The inside of the grinding roll should be soft, for machining process , and also for dampen the vibration caused by the grinding process. In use, the outer layer of the grinding roll will be thinned. The purpose of this study to fix the beam Ni-Hard 1 by coating using a material Ni-Hard 1 with variable temperature liquid interface. The methodology of this study is the beam of Ni-Hard 1 to be coated (called die blank) is heated by the flow of liquid metal Ni Hard1. This process is called flushing. The volume of flushing fluid is accommodated at the disposal basin. The design, which has been determined, simulated using software (solidcast 8.2) to determine the temperature of interface, and then carried out experiments in the workshop.The bond was analyzed by testing the microstructure, composition, and hardness. Results from this study is the technology to coat Ni-Hard 1 with material Ni-Hard 1 that bonding occurs at the surface. Results of research showed that surface fixing with gravity casting method can be applied at Grinding roll, with the temperature variable interface that must be achieved between 887 ° C – 1198 ° C, flushing time between 10-20 seconds, with a pouring temperature of 1438 ° C – 1468 ° C.

The Effect of Aggregate Size and Resin Fraction on The Damping Capacity of Epoxy-Marble Composite Hermana, Gita Novian; Kusnowo, Roni; Purwadi, Wiwik; Pradesar, Yusuf
Jurnal Bahan Alam Terbarukan Vol 10, No 2 (2021): December 2021 [Nationally Accredited - Sinta 2]
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jbat.v10i2.34070

The production of material with high precission and high complexity has been rapidly increasing in several industrial sector. The high accuracy is difficult to achieve during manufacturing due to vibration factors that influenced the final product of material. In this study the relationship between particle size and percentage of marble aggregate with epoxy resin on damping capacity was studied systematically. The Composite materials were fabricated by using conventional casting technique with 10, 25, and 50% volume fraction of resin and two marble aggregate groups with 0.5-0.7 mm and 1.4-2.0 mm in particle size. The casting process was using multilayer pouring technologies to prevent void formation. 10% epoxy resin-fine marble aggregate has very good vibration result with 0.003 mm in displacement, 0.23 mm/s in velocity, and 0.2 m/s2 in acceleration. The 10% epoxy resin-fine marble aggregate also has the best damping ratio among the composite due to the large specific area and porosity inside the marble material with value of 0.5%. The multilayer pour techniques for composite has been successfully adapted in this study to minimalize void/bubble formation inside and upperside of epoxy resin during the fabrication of composite. The secondary electron image of composite was observed that the marble aggregates and epoxy resin bonding are very good and no crack or void formation in the interface of the marble aggregate and epoxy resin.

OPTIMASI TEMPERATUR INTERFACE PADA PELAPISAN ULANG NI-HARD 1 DENGAN METODE GRAVITY CASTING Kus Hanaldi; Wiwik Purwadi; Friya Kurnia Nurzaenal
Jurnal Teknologi Terapan Vol 3, No 1 (2017): Jurnal Teknologi Terapan
Publisher : P3M Politeknik Negeri Indramayu

Grinding roll is one type of product made by the method of bimetallic casting. The product consists of two types of material that held together with foundry process. Grinding roll has two kinds of different material properties, outer grinding roll should be hard because it would destroy the mine or rock with material hardness at 9.3 mohs. The inside of the grinding roll should be soft, for machining process , and also for dampen the vibration caused by the grinding process. In use, the outer layer of the grinding roll will be thinned. The purpose of this study to fix the beam Ni-Hard 1 by coating using a material Ni-Hard 1 with variable temperature liquid interface. The methodology of this study is the beam of Ni-Hard 1 to be coated (called die blank) is heated by the flow of liquid metal Ni Hard1. This process is called flushing. The volume of flushing fluid is accommodated at the disposal basin. The design, which has been determined, simulated using software (solidcast 8.2) to determine the temperature of interface, and then carried out experiments in the workshop.The bond was analyzed by testing the microstructure, composition, and hardness. Results from this study is the technology to coat Ni-Hard 1 with material Ni-Hard 1 that bonding occurs at the surface. Results of research showed that surface fixing with gravity casting method can be applied at Grinding roll, with the temperature variable interface that must be achieved between 887 ° C – 1198 ° C, flushing time between 10-20 seconds, with a pouring temperature of 1438 ° C – 1468 ° C.

PENINGKATAN KEKERASAN PERMUKAAN FERRO CASTING DUCTILE (FCD) 700 MELALUI PROSES NITRIDASI DENGAN MEDIA UREA Wiwik Purwadi; Dewi Idamayanti; Firman
CR JOURNAL (CREATIVE RESEARCH FOR WEST JAVA DEVELOPMENT) Vol. 1 No. 01 (2015): Creative Research For West Java Development
Publisher : Badan Penelitian dan Pengembangan Daerah Provinsi Jawa Barat

Show Abstract | Download Original | Original Source | Check in Google Scholar

Ferro Casting Ductile (FCD) 700 is widely used for products requiring strength, ductility and impact resistance such as crank shaft. Surface hardening can be aplied to improve the performance of this material which can be accomplished through nitriding process. This research deals with nitriding process by using urea as the nitrogen source to achieve the surface hardness of 700 HV(600 HRC). Nitriding has been accomplished by varying the temperature (530oC, 550oC, 580oC, 600oC, and 620oC) and holding time (1-2hrs). The ratio between the amount of urea and surface area is constantly maintained at 0,25 g/mm2, while the room pressure in the nitriding tube was 0,3 Mpa. The hardness value and the microstructure are used to analyse the result. 1 hr of holding time with at the temperature of 580oC, 600oC, 620oC and 2 hrs holding time at 530oC, 550oC, 580oC, 600oC, dan 620oC has resulted white layer on the surface of the material. The maximum depth of white layer (4,83 μm) has been achieved at 2 hrs holding time and temperature of 620oC. The maximum hardness of 733 HV is resulted after holding the temperature at 580oC for 2 hrs.

Perancangan Gearbox Transmisi untuk Amphibious Articulated All Terrain Vehicle Surya Herlambang, Firhan; Ibrahim, Bustami; Purwadi, Wiwik; Wigenaputra, Dadan Heryada
JTRM (Jurnal Teknologi dan Rekayasa Manufaktur) Vol 5 No 2 (2023): Volume: 5 | Nomor: 2 | Oktober 2023
Publisher : Pusat Penelitian, Pengembangan, dan Pemberdayaan Masyarakat (P4M) Politeknik Manufaktur Bandung (Polman Bandung)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.48182/jtrm.v5i2.160

Indonesia is one of the countries with a high level of natural disaster vulnerability, so a good disaster mitigation process is needed. Amphibious Articulated All Terrain Vehicle (AAATV) is designed as one of the solutions to the difficulty of the mitigation process. Amphibious Articulated All Terrain Vehicle is a vehicle with special capabilities that are able to pass through various terrains. Amphibious Articulated All Terrain Vehicle consists of several systems, one of which is the propulsion system. In the Amphibious Articulated All Terrain Vehicle drive system, there is one sub-system, namely the transmission gearbox. This design process uses the VDI 2222 methodology. The design and validation process uses SOLIDWORKS and KISSsoft software. From the design results, it is found that the vehicle will use a Kubota V2203 type diesel engine with a power of 36.4 kW. The desired speed variation is achieved with values of 9.85 km/h, 19.34 km/h, 39.64 km/h, and 10.04 km/h. The design weight is 58.73 kg with dimensions of 346.1 mm x 260 x 347 mm

PENINGKATAN KEKERASAN PERMUKAAN FERRO CASTING DUCTILE (FCD) 700 MELALUI PROSES NITRIDASI DENGAN MEDIA UREA Purwadi, Wiwik; Idamayanti, Dewi; Firman
CREATIVE RESEARCH JOURNAL Vol 1 No 01 (2015): Creative Research Journal
Publisher : Badan Penelitian dan Pengembangan Daerah Provinsi Jawa Barat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34147/crj.v1i01.195

Ferro Casting Ductile (FCD) 700 digunakan untuk produk yang memerlukan kekuatan, duktilitas dan ketahanan impak, misalnya pada poros engkol. Untuk meningkatkan kinerja material dapat dilakukan pengerasan permukaan antara lain dengan proses nitridasi. Proses nitridasi dengan menggunakan urea sebagai sumber nitrogen dilakukan untuk meningkatkan kekerasan permukaan hingga 700 HV (60 HRC). Pada penelitian ini proses nitridasi dilakukan berdasarkan rasio urea per luas permukaan nitridasi. Variabel parameter yang diaplikasikan adalah temperatur (530 0C, 550 0C, 580 0C, 600 0C, dan 620 0C) dan waktu proses (1 jam dan 2 jam). Parameter yang digunakan secara konstan adalah rasio ketersediaan urea per luas permukaan sebesar 0,25 g/mm2 dan tekanan ruangan nitridasi 0,3 Mpa. Verifikasi hasil dilakukan dengan pengujian kekerasan dan struktur mikro. Berdasarkan analisa struktur mikro yang didapat, pada variasi temperatur dan waktu nitridasi (580 0C, 600 0C, dan 620 0C dengan waktu proses nitridasi 1 jam dan 530 0C, 5500C, 580 0C, 600 0C, dan 620 0 dengan waktu proses 2 jam) dihasilkan white layer pada permukaan FCD 700. Kedalaman white layer maksimum terjadi pada temperatur nitridasi 620 0C dengan waktu nitridasi 2 jam sebesar 4,83 μm. Kekerasan permukaan tertinggi sebesar 733 HV dihasilkan pada temperatur 580 0C dengan waktu proses 2 jam

EFFECT OF MAGNESIUM TREATMENT PROCESS ON THE PRODUCING COMPACTED GRAPHITECAST IRON WITH DIFFERENT CASTING THICKNESS Ramadhani, Tama; Purwadi, Wiwik; Polonia, Betti Ses Eka; Yusuf, Yusuf
Injection: Indonesian Journal of Vocational Mechanical Engineering Vol 1 No 2 (2021)
Publisher : Pengelola Jurnal Politeknik Negeri Ketapang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58466/injection.v1i2.1409

Strength, toughness, machinability and damping capacity are properties of compacted graphite iron thatdistinguish the properties between flake graphite cast iron and spheroidal cast iron. The formation of compactedgraphite can be set to achieve the required specification. The formation of compacted graphite is started fromspheroidal to compacted cast iron. The residual magnesium after magnesium treatment and the solidification ratehave a significant role in the formation of compacted graphite. The high content of residual magnesium canobstruct the graphite plane to grow during the transformation from spheroidal to compacted shape. In addition,the cooling rate of the casting can be controlled by varying the casting thickness. The compacted graphite in thecast iron are characterized according to shape, size ai`nd distribution. The optimum compacted graphite in thecast iron that can be produced has 30 mm of casting thickness with 0.017 % of residual magnesium.

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