Browsing by Author "Farida, Ida"

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    ANALYSIS OF SILICA SAND DISTRIBUTION AND GRAIN FINENESS NUMBER (GFN) FOR CASTING PROCESS
    (International Journal of Psychosocial Rehabilitation, Vol. 24, Issue 2, 2020) Komarudin, Udin; Farida, Ida; Santoso, Heru
    Silica sand is one type of sand that is sought after by industries, especially industries engaged in metal casting, because this sand can be used as a molding material. Besides being easily formed, silica sand can achieve maximum hardness after being mixed with chemicals namely resins and catalysts. To achieve the maximum strength of the sand mold curing time is required. This curing time provides the time / opportunity for the resin and catalyst to react so that the mold reaches its maximum strength. This study aims to determine the distribution of sand and the value of GFN (Grain Fineness Number), to determine the suitability of sand with the physical requirements of sand for casting iron. Testing of sand distribution is carried out on new, reclaimed and mixed Silica sand using the Sieve Analysis Test Type PSA (GP) (Laboratory Siever). The test was carried out within 15 minutes with vibration 8. Analysis results showed that the most recent sand distribution was in the 0.5 mm sieve, namely 29.61 g or 59.22%, with GFN = 27.8. The most reclamation sand distribution is in the 0.355 mm sieve, which is 15.65 gr or 31.3% with GFN = 43.53. And the most mixed sand distribution was at 0.355 mm sieve, which was 15.68 gr or 31.36% with GFN = 39.6. Sand that meets the physical requirements for the cast iron casting process is reclaimed Silica sand.
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    THE EFFECT OF TOOL ROTATION SPEED VARIATION TO HARDNESS AND MICROSTRUCTURE IN THE WELDING OF COMPOSITE ALSITIB-7,5%SIC BY FRICTION STIR WELDING METHOD
    (International Journal of Psychosocial Rehabilitation, Vol.24, Issue 02, 2020) Farida, Ida; Sulardjaka
    Friction Stir Welding method is a welding method which utilize friction between rotate cutting tool which pressed to material, so it will generate local heat and make material soften and will be integrated or merged. The aim of this study is to understand the effect of rotational speed (808 rpm, 1087 rpm, 1570 rpm) to hardness and microstructure of composite AlSiTiB-7.5%SiC welding by using a tool which have conical pin shaped, with welding speed is 0.02 mm/s. The results showed a significant increase in hardness value in the stir zone (nugget) region and TMAZ-HAZ interface region to hardness value of base metal. Rotational speed using 1087 rpm has highest average value of hardness in the area of the stir zone (nugget) with value 126.4 HV, while at 808 rpm the hardness value is 118.1 HV and at 1570 rpm is 74.6 HV. The microstructure result at 1087 rpm rotational speed showed no defects or wormhole occured if compare with 808 rpm and 1570 rpm rotational speed which has defect or wormhole.