Analisa Pengaruh Penambahan Abu Serbuk Kayu Meranti Terhadap Karakteristik Pasir Cetak Cacat Porositas Hasil Pengecoran Aluminium 6061

Saputra, Arfiansyah Galih (2014) Analisa Pengaruh Penambahan Abu Serbuk Kayu Meranti Terhadap Karakteristik Pasir Cetak Cacat Porositas Hasil Pengecoran Aluminium 6061. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Pengecoran logam merupakan salah satu metode pembentukan logam yang sering digunakan. Metode pengecoran yang paling sederhana menggunakan cetakan pasir. Penelitian mengenai metode ini terus dilakukan karena masih ditemukan berbagai macam cacat pengecoran. Salah satu penelitian yang masih dikembangkan adalah tentang komposisi pasir cetak dengan penambahan zat aditif yang bertujuan untuk memperbaiki kualitas benda hasil pengecoran. Penelitian ini dilakukan dengan penambahan abu serbuk kayu pada pasir cetak. Terdapat 9 variasi komposisi pasir cetak dengan variabel tetap yaitu air sebesar 4% dan bentonit sebesar 8% pada masing-masing cetakan. Penambahan abu serbuk kayu yaitu sebesar 0% sampai 8% dengan interval 1%. Sisanya terdiri dari pasir silika. Pasir akan dicetak dengan dimensi standar yaitu dengan diameter (Ø) 50 mm dan tinggi (t) 50 mm, selanjutnya dilakukan pengujian permeabilitas dan pengujian kekuatan tekan. Disamping itu akan dilakukan perancangan dan pembuatan sistem saluran serta pembuatan 3 rangka cetak. Pola yang akan digunakan dalam pengecoran berbentuk balok dengan panjang (p) 5 cm, lebar (l) 5 cm dan tebal (t) 1,2 cm. selanjutnya dilakukan pembuatan cetakan pasir. Cetakan pasir 1 berasal dari pasir cetak tanpa penambahan abu serbuk kayu. Cetakan pasir 2 terbuat dari pasir cetak dengan penambahan abu serbuk kayu yang mempunyai nilai permeabilitas tertinggi dan cetakan pasir 3 terbuat dari pasir cetak dengan penambahan abu serbuk kayu yang mempunyai nilai permeabilitas terendah. Setelah cetakan pasir kering, dilakukan proses pengecoran aluminium 6061. Pada saat pembongkaran hasil pengecoran, pasir cetak sisa pengecoran diukur ketebalan daerah yang dipengaruhi panas logam cair. Logam hasil pengecoran dipotong dari sistem saluran untuk mendapatkan benda cor yang akan diuji porositas. Dari penelitian ini didapatkan hasil bahwa pasir cetak tanpa penambahan abu serbuk kayu mempunyai nilai permeabilitas 139,33 cm3/menit dan kekuatan tekan sebesar 366,67 kN/m2 . Penambahan abu serbuk kayu sebesar 8% mempunai nilai permeabilitas 53,33 cm3 /menit dan kekuatan tekan sebesar 468,33 kN/m2. Persentase cacat porositas hasil pengecoran menggunakan pasir cetak tanpa penambahan abu serbuk kayu sebesar 0,99%. Persentase cacat porositas pada benda hasil pengecoran dengan penambahan 8% abu serbuk kayu sebesar 1,6%. Pada penambahan 2% abu serbuk kayu nilai permeabilitas masih memenuhi standar cetakan pasir kering.
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Metal casting is a commonly used method of metal forming. The simplest method of casting is using sand as mould. The researches of sand casting has been continuously done because of wide variety of problems such as defects on casting product. One of the researches that has been developed is about composition of sand mould with addition of addditive agent. This addition is intended to improve the quality of sand casting product.This research was conducted with the addition of sawdust ash into the sand compound. There were nine variations of molding sand composition with fix variable at 4% of water and 8% of bentonite in each mould. The addition of sawdust ash varied from 0% to 8% with increment of 1%, the remainder consisted of silica sand. Molding sand that had been mixed, moulded in accordance with the standard dimensions, namely the 50 mm in diameter and 50 mm in height, specimen would undergo permeability and compressive strength test. Further step would be the making and designing the gating system and 3 molding frames. The pattern to be used for this casting was a beam with 5 cm of length, 5 cm of width and 1.2 cm of thickness. The next process was the making of sand casts. The first sand cast was composed of sand without the addition of sawdust ash. The second sand cast used combination of sand, bentonite,water and sawdust ash with the best permability. The third sand cast used combination of sand, bentonite,water and sawdust ash with the lowest value of permeability. Once sand mold had been dried, the casting process would have been ready to be done. The metal used was aluminum 6061. During the removal of casting results, the heat affected zone was measured. The product had been cut off from its gating system before porosity testing was done. The experiment showed that the molding sand without the addition of sawdust ash had permeability value of 139.33 cm3/minute and compressive strength of 366.67 kN/m2. The addition of sawdust ash by 8% had a value permeability of 53.33 cm3/minute and compressive strength of 468.33 kN/m2. The porosity of product using casting sand without the addition of sawdust ash was 0,99% and with addition of 8% sawdust ash was 1,6%. The addition of 2% sawdust ash resulted a tolerable permeability for dry sand casting

Item Type:	Thesis (Other)
Additional Information:	RSM 671.252 Sap a
Uncontrolled Keywords:	Pasir cetak, abu serbuk kayu, kekuatan tekan, permeabilitas, porositas,aluminium; Moulding sand, sawdust ash, compressive strength, permeability, porosity, aluminium
Subjects:	T Technology > TS Manufactures > TS233 Sand casting. Metal castings--Thermal properties.
Divisions:	Faculty of Industrial Technology > Mechanical Engineering > 21201-(S1) Undergraduate Thesis
Depositing User:	Mr. Marsudiyana -
Date Deposited:	08 Jun 2023 08:01
Last Modified:	08 Jun 2023 08:01
URI:	http://repository.its.ac.id/id/eprint/98065

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