Uji ketahanan fatik aluminium hasil remelting piston bekas menggunakan metode pengecoran centrifugal casting

This research studies the effect of flow rate on the pouring of molten metal into the mould so that the flow rate into the mould can be controlled. Furthermore, this research studies the effect of mould preheating so that the temperature inside the cavity can be maintained, especially for narrow holes. The process starts with making the engine cylinder head pattern and gating system using a three-dimensional printer with polylactic acid resin. The mould pattern and gating system are combined and coated with a layer of cement plaster, silica sand and kaolin. After the coating is dry, the mould is heated until the mould pattern evaporates and there is no residue. The casting process was carried out at pre-heating moulds of 300 0C and 350 0C and a pouring temperature of 800 0C with pouring speeds of 20, 30, and 40 rpm. The final stage of the research is manufacturing test objects and testing mechanical properties. The results showed that the higher the pouring speed, the less perfect the casting results, especially in the cylinder head fins. The best casting results occurred in the pre-heat condition of the 300 0C mould with a pouring speed of 20 rpm, with a Maximum Tensile Strength of 105 N/mm2, Hardness 53 hardness Brinell test (HBN), Density and Porosity of 2.43 gr/cm3. The material used in this study refers to the reference is A356 Aluminum Alloy.

Section: Pembahasanunclassified

Pengaruh variasi laju aliran dan preheating cetakan pada investment casting terhadap sifat fisis dan mekanis prototipe aluminium cylinder head engine

Masy'ari

Prasetiyo

Karyadi

et al. 2022

“…Pada pengecoran semi solid temperatur tuang sangat berpengaruh pada hasil struktur mikro serta hasil kekerasan material itu sendiri [10][11][12][13][14][15].…”

Section: Kekerasanunclassified

Analisa variasi temperatur terhadap nilai kekerasan aluminium pada proses squeeze casting

Wahyudi

Asroni

2022

Aluminum is a non-ferrous metal and has the advantages of light specific gravity, corrosion resistance. Aluminum can also be used in the manufacture of pistons, engine blocks, wheels, drums. Squezze casting is a casting process, where molten metal is poured and pressure is applied until the solidification process is complete. Using hydraulic pressure, this technique is able to improve the physical and mechanical properties, especially on aluminum base material. The research method uses the Squeeze Casting process with temperature variations of 300 0 C, 400 0 C, 500 0 C, the pressure is 60 seconds,the pressure is 5 tons. Pressing time for 75 seconds and Vickers hardness test. The results of the highest hardness value are in specimens with a temperature of 500 0 C, namely with a value of 60.2 VHN, and for the lowest hardness value are found in specimens with a temperature of 300 0 C with a value of 48.9 VHN. As well as the results of the hardness test another is at a temperature of 400 0 C to get a hardness value of 51.1 VHN. Based on the hardness test that has been carried out the most optimal hardness value is on a specimen with a temperature of 500 0 C.

“…Rekapitulasi hasil running model 3D geladak utama kapal menggunakan aplikasi berbasis elemen hingga ditunjukkan pada Tabel 3. [12][13][14].…”

Section: Hasil Dan Pembahasanunclassified

Analisa fatigue life konstruksi geladak pada kapal Landing Craft Tank menggunakan metode elemen hingga

Alamsyah

Arwan

Wulandari

2021

The Landing Craft Tank ship is the usual vessels used to transport massive vehicles like excavator, bulldozer, heavy cargo and other heavy equipment indispensable for construction work. There are heavy equipment decks on the LCT vessels that are use to hold or support the cargo above it. The purpose of this study was to determine the stress value in the deck construction that has been modeled before with a plate thickness variation of 80%, 90% and 100% which is then followed by finding the value of fatigue life in the deck construction. The method used in the analysis this time is the finite element method which models the construction deck of LCT vessels assisted by finite element based applications. From the results of the study it was found that the stress on the deck construction of LCT vessels with plate thickness 100% was 99. 513 MPa, plate thickness 90% was 104.72 MPa and at plate thickness 80% was 105.19 MPa. While the value of fatigue life with a deck plate thickness of 100% is 26.84 years with a number of cycles of 1006700 times, deck plate thickness of 90% is 16.22 years with a number of cycles 129000 times and deck plate thickness of 80% is 15.91 years with a number of cycles 125000.