Browsing by Author "Birawidha, David C"

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    Analyses Of Stress And Deformed Shape Of Hammer Mill Hammers (HMHs) By Using Autodesk Inventor
    (2016-04-22) Isnugroho, Kusno; Hendronursito, Yusup; Birawidha, David C; Yunus, Muhammad
    Analyses on stress and deformed shape of Hammer Mill Hammers (HMHs) by using Autodesk Inventor software had been conducted. The simulation by using impact of 21.396 N and moment force of 1.326 Nmm resulted maximum result of Von Mises stress 153.5 Mpa and maximum displacement of 0.1695 mm with stress impact concentrated at one point (middle part) of the HMHs surface. If direction of impact load worked at the middle point and was distributed evenly at the periphery part of HMHs surface, the maximum Von Mises stress value was 204.4 Mpa and maximum displacement was 0.2819 mm. Seeing from obtained maximum Von Mises value, HMHs would not undergo failure because maximum of Von Mises value was lower than yield strength of used material; the manganese steel, with yield strength of 360 Mpa. Minimum values of safety factor or both directions of impact load were 1.761 and 2.345 respectively, and they excessed required values for a design (safety factor > 1).
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    Preliminary Study Of Processing Manganese Ore From Pringsewu District Of Lampung Province
    (2016-04-22) Isnugroho, Kusno; Hendronursito, Yusup; Birawidha, David C
    Manganese ore coming from Pringsewu district of Lampung province belongs to manganiferous ore. Containing approximately 32.27% Mn and 14.87% Fe, this Pringsewu manganese ore is classified into low grade manganese ore (Mn<40%). Processing by hydrometallurgy technique has some shortcomings, and one of them is expensive additional cost for reprocessing used chemical materials. The objective of this research was to process low grade manganese ore by using composite pellets followed with pyrometallurgy process. The first process was started by milling, sieving, stirring, and composite pellet making. The next process was composite pellet reduction by using hot blast cupola and induction furnace into pig iron with manganese containing, and this was usually called as spiegeleisen. Reduction process by using hot blast cupola produced spiegeleisen with the following compositions: 16.98% Mn; 5.02% C; 75.64% Fe; 0.87% Si; 0.072% P; 0.028% S; while reduction process by using induction furnace produced spiegeleisen with the following compositions: 9.36% Mn; 4.85% C; 86.03% Fe; 0.21% Si; 0.01% P; 0.02% S