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Teknik Mesin, Universitas Proklamasi 45 Yogyakarta
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Pengaruh Variasi Temperatur Tuang Pengecoran Produk Pulley Terhadap Kekerasan, Ketangguhan dan Metalografi Berbahan Baku Aluminium Bekas Sumpena
Politeknosains Vol 17 No 2 (2018): Jurnal Politeknosains Volume 17 Nomor 2 - September 2018
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat (LPPM) Politeknik Pratama Mulia Surakarta

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Abstract

Pulley is a component product that is widely used in power transfer and rotation systems, such as in milling, machines with electric motor and fuel motor drives. The effect of molten metal pouring temperature needs to be examined so that pulley products are obtained which have mechanical properties in accordance with their usefulness. The purpose of this study was to determine the effect of casting temperature variations on pulley casting products on hardness, toughness and metallography of used aluminum raw materials. The smelting process uses a crucible furnace in the Prokalmasi45 University metal casting laboratory. Sand molds are made of three types for casting with different temperatures, each of the same pouring temperature is made of each of the three sand molds. The pouring of aluminum molten metal is carried out at temperatures of 670oC, 700oC and 730oC. Measurement of the temperature of molten metal casting using an infrared measuring instrument is carried out when the molten metal is ready to be poured into the mold. Hardness testing was carried out by Brinell hardness testing machine, toughness testing with ASTM D256-03 standard Charpy impact testing machine and metallographic observation on each specimen using an optical microscope. The test results show that the influence of pouring temperature on hardness is the highest hardness obtained at 700oC pouring with a hardness value of 77.05 BHN, while the lowest hardness value is obtained at pouring 670oC with a hardness value of 64.02 BHN. Effect of pouring temperature on toughness is the highest toughness value obtained at 670oC pouring at 0.0608 joule / mm2, while the lowest toughness value at 700oC pouring is 0.0438 joule / mm2. The influence of the pouring temperature on the microstructure is pouring 700oC to spread the elements of Fe, Si and Mg evenly, while the pouring at temperatures of 670oC and 730oC has almost the same characteristics, namely elements of Fe and Si compound while the elements Al and Mg are separate compounds.
Teknologi Tepat Guna Mesin Irat Bambu untuk Meningkatkan Produksi Bagi Pengrajin Bambu Gedek di Desa Karanganom, Kec. Klaten Utara, Kab. Klaten, Prop. Jawa Tengah Sumpena; Jemadi
Politeknosains Vol 16 No 2 (2017): Jurnal Politeknosains Volume 16 Nomor 2 - September 2017
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat (LPPM) Politeknik Pratama Mulia Surakarta

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Abstract

The purpose of using bamboo depletion machine is to increase the quantity and quality of bamboo depletion production for gedek bamboo craftsmen. Bamboo depletion machine is a machine that works to attenuate bamboo with the thickness that can be arranged as needed. This machine is used to help small entrepreneurs produce bamboo depletion products in large quantities by saving time and labor. The working principle of this engine is a motor gasoline as a driving force to generate power and rotation that is transmitted through pulleys and belts to the shafts with the aid of gears on each axle to rotate the roller. After roller rotate will produce a tensile force that will be used to pull the bamboo to the knife so that there bamboo depletion process. The experimental results show that this bamboo depletion machine has an average capacity of 224 layers / hour. Dimension of bamboo depletion machine with specification: P 600 mm, L 600 mm, T 1200 mm, iron plate material, power motor drive 5,5 PK. So that the productivity and quality of products made of bamboo can be the same and uniform according to consumer standards.
Pengaruh Dimensi Saluran Masuk pada Scrap Aluminium Sand Casting Pulley terhadap Kekerasan, Ketangguhan dan Struktur Mikro Sumpena; Hb. Sukarjo
Politeknosains Vol 15 No 2 (2016): Jurnal Politeknosains Volume 15 Nomor 2 - September 2016
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat (LPPM) Politeknik Pratama Mulia Surakarta

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Abstract

The purpose of this study for determine influence size of the inlet to the hardness, toughness and microstructure pulley with casting mold sand raw materials aluminum scrap. The smelting process using crucible furnace. Sand molds be made 3 kinds of different inlets, each inlet same was made 4 sand molds. Hardness testing is done by using the Vickers hardness test. the load to pressure 100 gf, the time to pressure 5 seconds. Toughness testing with use standard ASTM D256-03 machine test impact charpoy. Observation of microstructure was observed on each specimen by using an optical microscope. The hardness test results show that hardness value of the highest on the dimensions of the inlet height 6 mm is 64.4 VHN while the lowest value to the dimensions of the inlet height 5 mm is 60.96 VHN. The toughness test results show that toughness value from the three specimens almost the same is 0.057 joules / mm2; 0.0565 joule / mm2 and 0.0565 joules / mm2. While the structure micro of castings with high dimensional inlet 5 mm and 7 mm occurred structure micro which is almost the same, while the dimensions of the inlet height 6 mm has a spread of Fe, Si and Mg is more evenly distributed.
Pengaruh Variasi Dimensi Saluran Tuang Terhadap Fluidita, Porositas dan Kekerasan Pengecoran dengan Bahan Baku Aluminium Bekas Sumpena
Politeknosains Vol 15 No 1 (2016): Jurnal Politeknosains Volume 15 Nomor 1 - Maret 2016
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat (LPPM) Politeknik Pratama Mulia Surakarta

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Abstract

Quality casting one of which depends on the system and the sprue size, so need to analyze the effect of sprue size, till how long aluminum molten able to flowing in sand molds.With made variations diameter in gate expected to be obtained capable of a maximum flow or is able to flow most distant. This will assist in completing the castings process for cast objects with a certain length. The purpose of this study was to determine the effect of variations dimensions sprue to fluidity, porosity and hardness foundry of the raw material for aluminum scrap. Smelting process carried out in the laboratory of the foundry Department Mechanical Engineering University of Proklamasi 45 Yogyakarta. The smelting process using the crucible furnace on it be put kowi the place aluminum to be melted down. Sand mold is made of 3 pieces for each sprue 1 (d1), sprue 2 (d2), sprue 3 (d3). Patterns made with thickness 3 mm, 4 mm, 6 mm and 7 mm. The measurement results calculated averages value length fluidity for each thickness the castings. Observations the porosity was do by weighing of the castings (mass, kg) divided by the volume of the castings, so obtainable the density of the castings. Hardness testing is done with the kind of Vickers hardness test. Testing in this study using a 200 g load suppression, loading time 10 seconds, using a hardness machine types Buehler High Quality Micro Hardness Tester 0054 MM models. The testing results and observations indicate that the longest fluidity with diameter sprue 13 mm for thickness objects 3 mm and 4 mm with length is 251.7 mm and 290 mm. The fluidity longest also be obtained on castings the sprue diameter 15 mm with thick 6 mm and 7 mm is 296.86 mm and 343.33 mm. Hardness testing results show the value of the highest hardness on sprue diameter 17 mm is 107.98 VHN, while the value of the lowest hardness on sprue diameter of 15 mm is 88.3 VHN. Porosity observations showed that diameter sprue 17 mm obtained the lowest porosity level that is equal to 2.734 gr/cm3, while the level of the highest porosity is obtained on the diameter sprue13 mm castings of 2.831 gr/cm3.
Co-Authors Hb. Sukarjo Jemadi