Pengaruh Variasi Bahan Pengikat Terhadap Kekuatan Cetakan Pasir, Permeabilitas, Fluiditas, Kekerasan Logam dan Kualitas Hasil Pengecoran Logam Paduan Al-Si Dengan Metode Gravity Casting

Dian Adi Putra, Siswanto Siswanto, Poppy Puspitasari

Abstract

This research was conducted to investigate the effect of binder variation including bentonit, lapindo mud, and portland cement on the silica molding sand strength, permeability, fluidity, metal hardness and the quality of Al-Si alloy casting by using gravity casting method. The experimental design was used on this research and analyzed by using descriptive data analysis. The result showed molding sand containing 15% lapindo mud binder had the highest wet compressive strength (8,73 N/cm2). The molding sand containing 15% portland cement binder had the highest dry compressive strength (>32 N/cm2). The highest wet tensile strength was resulted by the molding sand containing 15% bentonit binder (3,33 N/cm2), while the highest dry tensile strength was resulted by the molding sand containing 15% portland cement binder (18,60 N/cm2). The highest wet shear strength was resulted by the molding sand containing 15% portland cement binder (0,57 N/cm2), while the highest dry shear strength was resulted by the molding sand containing 15% portland cement binder (1,03 N/cm2). The molding sand containing 15% bentonit binder had the finest permeability (210 mm/minute). In the real practical application, the molding sand containing 15% portland cement binder was unable to result an appropriate molding strength when manually compressed in cope and drag (casting flask), thus it was unable to use as metal pouring media. The molding sand containing 15% lapindo mud binder had the finest fluidity but it had the lowest hardness (120,30 HV). The molding sand containing 15% bentonit binder resulted the best Al-Si alloy casting quality and the highest hardness (129,60 HV).

Keywords

binder; molding sand strength; permeability; fluidity; metal hardness; casting quality

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References

Apriliyanto, Praba & Sakti, A. M. 2014. Analisis Variabel Proses Produk Pengecoran Logam Menggunakan Cetakan Sand Casting. Jurnal Teknik Mesin, (Online), 2 (2): 70-78, (http://scholar.google.com/scholar?q=pasir+cetak&btnG=&hl=id&as_sdt=0%2C5&as_ylo=2014), diakses 10 Maret 2014.

British Geological Survey-Natural Environment Research Council. 2009. Mineral Planning Factsheet: Silica Sand. (Online), (https://www.bgs.ac.uk/downloads/directDownload.cfm?id=1369&noexcl=true&t=Silica%20sand), diakses 10 Maret 2014.

Broto, Opi Wisnu. 2014. Pengaruh Penggunaan Lumpur Lapindo sebagai Bahan Pengikat pada Pasir Cetak terhadap Kualitas dan Fluiditas Hasil Pengecoran Logam Al-Si. Skripsi tidak diterbitkan. Malang: Universitas Negeri Malang.

Dwiyanto. 2010. Pengaruh Perbedaan Casting Modulus Coran terhadap Kekerasan serta Struktur Mikro Hasil Proses Pengecoran Cetakan Pasir Paduan Aluminium. Skripsi tidak diterbitkan. Surakarta: Universitas Sebelas Maret Surakarta.

Mukhlis, Yelvi. 2013. Pengaruh Beberapa Jenis Pasir terhadap Kekuatan Beton, Jurnal Poli Rekayasa, (Online), 9 (1): 49-55, (http://ojs.polinpdg.ac.id /index.php/JPR/article/download/768/735), diakses 13 Nopember 2014.

Sugiyono. 2013. Metode Penelitian Pendidikan (Pendekatan Kuantitatif, Kualitatif, dan R&D). Bandung: Alfabeta.

Surdia, Tata & Chijiiwa, Kenji. 1980. Teknik Pengecoran Logam. Jakarta: Pradnya Paramita.

Widodo, Toni Prasetyo. 2014. Pengaruh Kadar Semen Portland dalam Pasir Cetak terhadap Kekuatan Cetakan Pasir, Permeabilitas, Fluiditas, Kekerasan Logam dan Kualitas Coran Logam Al-Si dengan Metode Gravity Casting. Skripsi tidak diterbitkan. Malang: Universitas Negeri Malang.

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