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All Journal JURNAL TEKNIK MESIN
Yusuf Umardhani
Dosen Jurusan Teknik Mesin, Fakultas Teknik, Universitas Diponegoro
Mechanical Engineering

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UJI KARAKTERISTIK SPONGE IRON HASIL REDUKSI MENGGUNAKAN BURNER LAS ASITELIN DARI PASIR BESI PANTAI ASEMDOYONG PEMALANG Yugo Pranoto; Sugeng Tirta Atmadja; Yusuf Umardhani
JURNAL TEKNIK MESIN Vol 3, No 2 (2015): VOLUME 3, NOMOR 2, APRIL 2015
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

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Abstract

Iron sand is sand deposits containing particles of iron ore (magnetite) found along the coast. Sponge iron is obtained from direct reduction of iron ore at a temperature below its melting point, using natural gas or gas reductant of coal or solid reductant such as coal. Sponge is also known as DRI (Directly reduced Iron) or substitute scrap (scrap substitute) in accordance with its function substitute scrap-iron in the steel industry. Sponge is some product manufacture of steel through a direct reduction process, the steel-making process flow of sponge through the burner welding asitelin. In this study is made of sponge iron from iron sand beaches raw materials Asemdoyong, Pemalang. This process uses the raw material composite pellets are made from a mixture of fine iron ore, coal, slag-forming materials and adhesives. From sampling 15 kg of sand, iron sand obtained 3.5634 kg, the percentage 23.75%. Sieving 100 mesh, obtained 2.3630 kg, the percentage of 15.75%. Briquettes are made as much as 3 kg, with a composition of 75% iron sand as 2.25 kg, 20% charcoal as much as 0.6 kg, and aci 5% as much as 0.15 kg. Briquettes produced weighing 44.47 grams per briquette. Carbon is used charcoal which serves as a reductant. Reduction of welding burner asitelin obtained sponge iron with varying weight, 12.16 g, 15.15 g and 16.61 g. Results of testing the composition of the AAS method, the composition of the raw materials obtained 52.12% Fe, 8.10% C, 1.94% Si, and 2.18% Mg. While the sponge iron is composed of 62.46% Fe, 2.70% C, 0.85% Si, and 1.43% Mg. From the data shown a significant increase in Fe content of 10.34%, and is accompanied by a decrease in the levels of impurities in the iron sand.
PENGARUH TEMPERATUR CETAKAN PADA CACAT VISUAL PRODUK PISTON DENGAN METODE DIE CASTING Aang Kurniawan; Susilo Adi Widyanto; Yusuf Umardhani
JURNAL TEKNIK MESIN Vol 1, No 3 (2013): VOLUME 1, NOMOR 3, JULI 2013
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

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Abstract

The need of the piston is increasing with the increasing number of motorcycles. Piston are not only made by large scale producers but also by small and medium industries. Challenges faced by small and medium industries are how to compete with large industry due to limited knowledge and technology in the field of metal casting. The material used is secondhand aluminum and addition aluminum alloy ADC12 which is a composition of silicon <12%.         The research is done with making mould of die casting and making of moulding machine. Variable selected in this research is die temperatur (250°C, 320oC, 350ºC and 400 oC) and cast temperatur is 800ºC which pass trough casting process with method of die casting to know the casting defect that happen analysed visually. Preparation of casting by melting secondhand aluminum and ADC12 whice later to process casting.          Results show the casting defects that happened for example cold shut, shrinkage, rough surface and porosity. Optimum die temperatur in process casting piston product with metode of die casting is die temperatur 320ºC, because this temperatur defect that happened in the from of shrinkage happened some of just small at area below cover rough surface that happened of piston products that can still be tolerated. At die temperatur more than 320ºC the dominant shrinkage happened at the bottom of the piston cover. And the die temperatur less than 320ºC cold shut will happened primarily in the location of thin walled.
PENGARUH TEMPERATUR CETAKAN PADA CACAT VISUAL PRODUK PISTON DENGAN METODE DIE CASTING Aang Kurniawan; Susilo Adi Widyanto; Yusuf Umardhani
JURNAL TEKNIK MESIN Vol 1, No 3 (2013): VOLUME 1, NOMOR 3, JULI 2013
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (832.548 KB)

Abstract

The need of the piston is increasing with the increasing number of motorcycles. Piston are not only made by large scale producers but also by small and medium industries. Challenges faced by small and medium industries are how to compete with large industry due to limited knowledge and technology in the field of metal casting. The material used is secondhand aluminum and addition aluminum alloy ADC12 which is a composition of silicon <12%. The research is done with making mould of die casting and making of moulding machine. Variable selected in this research is die temperatur (250°C, 320oC, 350ºC and 400 oC) and cast temperatur is 800ºC which pass trough casting process with method of die casting to know the casting defect that happen analysed visually. Preparation of casting by melting secondhand aluminum and ADC12 whice later to process casting. Results show the casting defects that happened for example cold shut, shrinkage, rough surface and porosity. Optimum die temperatur in process casting piston product with metode of die casting is die temperatur 320ºC, because this temperatur defect that happened in the from of shrinkage happened some of just small at area below cover rough surface that happened of piston products that can still be tolerated. At die temperatur more than 320ºC the dominant shrinkage happened at the bottom of the piston cover. And the die temperatur less than 320ºC cold shut will happened primarily in the location of thin walled.
UJI KARAKTERISTIK SPONGE IRON HASIL REDUKSI MENGGUNAKAN BURNER LAS ASITELIN DARI PASIR BESI PANTAI SUWERU JEPARA Sonar Hariawan; Sugeng Tirta Atmadja; Yusuf Umardhani
JURNAL TEKNIK MESIN Vol 3, No 2 (2015): VOLUME 3, NOMOR 2, APRIL 2015
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

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Abstract

Sponge iron is a product in the manufacture of steel that through the process of direct reduction of iron sand. Steel making process flow through the sponge starts from iron sand made pellet or briquettes in the shape of a reduction to sponge with the welding asitelin burner. In this research is made of sponge iron which raw materials iron sand from Suweru beach Jepara. Briquettes are made from a mixture of iron sand 75%, 20% carbon, and 5% tapioca flour as gluten. From taking of sand beach Suweru 5kg, obtained 3,3875 kg of iron sand from extraction process with permanent magnet as much as 2-3 times. After the extraction process, sieving process is carried out using a 100 mesh, obtained 2.2710 kg. So that it can be seen levels of iron sand beach Suweru was 67,75% and 45,42% are raw material that ready for production. Furthermore, the raw material mixing 2,25 kg of iron sand, 0,6% carbon (charcoal) and 0.15 kg of gluten (tapioca flour) with a total weight of 3 kg resulting in ± 70 briquette iron sand through the process of compacting the weight range of 43 grams per briquette. From sampling 3 briquette iron sand is reduced, resulting sponge iron by weight of 13,98 grams, 14,83 grams and 17.97 grams that can be known percentage yield of 36.68% reduction process. Results of testing the composition of the AAS method, the composition of the raw materials obtained 1.63% Mg, 2.63% Si, 7.30% C, and 49.90% Fe. However, after the reduction process, the composition of the sponge iron 1.4% Mg, 1.42% Si, 1.90% C, and 64.12% Fe. From the data shown a significant increase in Fe content of 14.22%, and is accompanied by a decrease in the levels of impurities in the iron sand.
REDUKSI PASIR BESI PANTAI SIGANDU KABUPATEN BATANG MENJADI SPONGE IRON MENGGUNAKAN BURNER GAS ASETILIN Itsnain Aji Pangestu; Sugeng Tirta Atmadja; Yusuf Umardhani
JURNAL TEKNIK MESIN Vol 3, No 2 (2015): VOLUME 3, NOMOR 2, APRIL 2015
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

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Abstract

In this experiment has been done laboratory scale processing of iron sand from Sigandu beach regency of Batang to be sponge iron by direct reduction using oxyacetylene gas burner at 1200 oC. Based on the experiments conducted through the process of making a composite pellets briquettes, and conducted trials combustion using oxyacetylene gas burner with the composition of the briquettes is 75% iron sand, wood charcoal is added as much as 20% functions as a reductant, and 5% tapioca which functions as glue. The iron sand into iron is required a long production stages, begins with the extraction or separation of magnetic minerals with non-magnetic using magnets to increase levels of Fe. From the results can be known content extraction iron sand of Sigandu beach is 62.27%. In the composition testing using AAS method (Atomic Absorption Spectrometry) iron sand composition (raw material) obtained 3.56% Si, 6.12% C, 1.42% Mg, and Fe 51.23%, after reduced to 62.13% Fe, 1.20% Mg, 0.85% C and 1.98% Si. From these data seen increase in the Fe content of 10.09%, accompanied with a decrease in content impurities in the sponge iron
Co-Authors Aang Kurniawan Itsnain Aji Pangestu Sonar Hariawan Sugeng Tirta Atmadja Susilo Adi Widyanto Yugo Pranoto