PENGARUH VARIASI SUHU TUANG TERHADAP KEKERASAN DAN STRUKTUR MIKRO PADA HASIL REMELTING ALUMINIUM TROMOL SUPRA X DENGAN CETAKAN LOGAM
Abstract
The objective of this research is to investigate the optimal casting temperature to produce the best molding on the hardness and microstructure of the aluminum remelting product of Supra X motorcycle drum brake with metal mould.This research used three casting temperature variations, namely: 7000C, 7250C, and 7500C. The aluminum material used in this molding was used back drum brake aluminum of Supra X motorcycle.This research used the experimental method with the descriptive data analysis. The data of the research were gathered through the calculation of the hardness of each specimen and the microstructure photograph-taking of each specimen. The result of the calculation of the hardness was then displayed in graphs for analysis.The result of the research shows that the highest molding hardness is found in the casting temperature variation of 7000C with the value of 86.17 BHN, whereas the lowest molding hardness is found in the casting temperature variation of 7500C with the value of 83.03 BHN, and the hardness of the drum brake aluminum of Supra X aluminum itself is 90.36BHN. Based on the microstructure photograph, the casting temperature variation of 7000C results in the best structure granules as indicated by the tiny size of Al-si granules, compared to the results of the other casting temperature variations of 7250C, and 7500C respectively of which the size of granules become larger along with the increase of the casting temperature variations. Thus, based on the result of the research, a conclusion is drawn that the casting temperature variation of 7000C results in the most optimal hardness and good microstructure, and among the tree casting temperature variations the casting temperature variation of 7000C results in casting temperature of which the quality of the aluminum remelting product approaches the quality of back aluminum drum brake of Supra X motorcycle. The hardness of the aluminum remelting product decreases along with the increase of the casting temperature variations, and the size of microstructure of the granules also becomes larger along with the increase of the casting temperature variations.
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