Browsing by Author "Santoso, Heru"

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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 CURING TIME ON WATER CONTENT IN THE METAL CASTING PROCESS
    (International Journal of Psychosocial Rehabilitation, Vol.24, Issue 02, 2020) Suryaman, Nia Nuraeni; Santoso, Heru; Prasetia, Adhita
    Silica sand is one type of sand that is often used by industries engaged in metal casting. This is because silica sand is used as a molding material. Besides being easily formed, this silica sand when mixed with chemicals such as resins and catalysts will achieve maximum hardness. In order to achieve the maximum strength of the sand mold, a curing time process is needed. After the molding material is mixed and stirred, the drying time starts to be calculated. Achieve maximum strength because the mixture reacts during curing time. This study aims to observe and study the effect of differences in curing time on the water content of alphaset molds. Curing time variations are at 2 hours, 4 hours, 6 hours, 8 hours, 24 hours, 48 hours and 72 hours. This research went through several stages of testing, including: sand distribution testing, compression test, water content test, LOI testing and SEM testing. The focus of this research is testing the water content. A good sample used for alphaset molding is one that has no water content. The results showed that samples that could be used were those that had curing time of 6 hours, 8 hours and 72 hours. This is because at the curing time it has a water content of 0%.
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    Lifting Plan for Containers Weight of 20 tons
    (International Journal of Psychosocial Rehabilitation, Vol. 24, Issue 2, 2020) Prasetya, Adhita; Komarudin, Udin; Santoso, Heru
    Infrastructure development in Indonesia supporting economic activities has reached its highest point in 2019. The construction of elevated toll roads has become one of the solutions for the development of the Cikampek- Jakarta toll road. Based on information, there have been several accidents on the toll road project due to the failure of the lifting process using a mobile crane. Based on this, an example of planning the appointment of a 40-foot container with a load of 20 tons using a mobile crane is intended to provide lessons in transport planning, so that accidents that occur can be minimized. The method used in this plan is as follows: (1) identify the dimensions and weight of the object to be transported; (2) determine the crane data to be used (3) calculate the total load of the object to be lifted along with the lifting gear (3) find the percentage of crane conditions used (4) calculate the Safety Factor; (5) comparing lifting capacity with the allowable lifting load based on the load card. Based on the calculation results, it can be concluded that the total load is 24,676 Tons, the lifting location factor is 28,377 Tons, Load Chart 29, 88 Tons, safety factor 1,052, with a boom length issued by 17.5 m, lift angle of 39o and the length of the main host is 5.9 m.
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    PREDICTION OF DEMAND FOR AIR TRANSPORT SERVICES IN HALUOLEO AIRPORT - KENDARI
    (International Journal of Psychosocial Rehabilitation, Vol.24, Issue 02, 2020) Santoso, Heru; Pramudita, Resa; Komarudin, Udin
    This paper will analyze the number of passengers and predictions about the number of passengers who will use the Haluoleo airport in Kendari. Several approaches for forecasting air transport passengers at Haluoleo Airport - Kendari are deemed necessary to facilitate the selection of realistic projection values, namely forecasting using the method Regression analysis with several variable simulations, forecasting using passenger growth rates for historical periods, forecasting with a linear model where time functions as an independent variable. From the results of this study the results of forecasting transport passengers from 2014 to 2035.