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All Journal Mekanika: Majalah Ilmiah Mekanika JMES The International Journal of Mechanical Engineering and Sciences
Aprianur Fajri
Sebelas Maret University
Energy Materials Science & Nanotechnology Mechanical Engineering

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The Influence Of Sand Casting Mold Solidfication Pressure Variations To The Quality Of Al-Si Alloy Casting Product Aprianur Fajri; Basyirun Basyirun
JMES The International Journal of Mechanical Engineering and Sciences Vol 2, No 2 (2018)
Publisher : LPPM, Institut Teknologi Sepuluh Nopember, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25807471.v2i2.4984

Abstract

The purpose of this study is to find The influence of the sand cast solidification pressure variations to the quality of an alloy Al-Si casting product. An experimental method was used in the study and the analysis of the data used descriptive analysis to explain the charts. The stages of researched process is preparation material and equipment; making the design and manufacture of a pattern; manufacture of the sand mold by 35, 40, 45, 50, and 55 kg/cm2 pressure variation; casting process; observation of defect; measurement of the level roughness; microstructure examination; assay composition; and last test is hardness micro vickers test. The research results show that variations pressure 35 kg/cm2 does not occur defect the needle at al. A defect of the needle that occur most frequently upon variations of the pressure of the 55 kg/cm2 is as much as 0.62 % . Air cavities formed to variation pressure solidification 35 kg/cm2  of 0.77 % to the least, while in variation 55 kg/cm2 happened the number of defect air cavities the most namely 3.96 % . The mold fall defect largest namely 1.95 % happened to variation pressure 35 kg/cm2. Defect of sand inclusion the least of 0.06 % happened to variation pressure 55 kg/cm2. Defect of fins formed due to variation pressure solidification sand mold experienced the number of been fluctuating, recorded high in early then decline and to high back in highest variation. The pressure variation 35 kg/cm2  it has value roughness flattened 3.17 and products castings the most rough happened to sand mold solidification variation pressure 55 kg/cm2 , with on average of 5.44. the degree of hardness highest of 141.8 VHN happened to variation pressure 35 kg/cm2  and lowest of 124.8 VHN happened to variation 55 kg/cm2. Concluded that the solidification of pressure variations sand mold 45 kg / cm2 produce castings products with the most optimal average in terms of the measurement of the defective; variation pressure solidification sand mold of sand casting 35 kg / cm2 produce a smooth surface, and the higher pressure make surface castings becomes rougher; solidification of pressure variations and coarse sand mold 35 kg / cm2 produce micro structure with smooth grains and becomes more violent along with increasing pressure; pressure variation 35 kg / cm2 produce a hardest surface, the higher of  the pressure variation it becoming violence number progressively lower. Keywords: Pressure variations, sand casting, quality
Design Analysis and Structural Prediction of Bus Driver Chair Support: A Study Case using HOQ and FEM Joung Hyung Cho; Ridwan Ridwan; Rama Panji Kusuma; Joko Triyono; Nurul Muhayat; Aprianur Fajri; Fajar Budi Laksono
Mekanika: Majalah Ilmiah Mekanika Vol 22, No 1 (2023): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v22i1.44371

Abstract

The bus driver's comfort is crucial. The location of the driver's seat, which is correlated with the seat support design, is one of the elements supporting his comfort. The bus business chosen as a representative is PT Selamet Trans Abadi, which has its headquarters in Pati City, Central Java. By considering the Safety Factor, House of Quality (HOQ), weight, shape, and seat support dimensions, this study intends to ascertain how the characteristics of the bus seat support form after receiving a load or force. Conducting a field visit to gather the necessary data is the initial step in this research. The following stage is to decide on the design criteria based on the collected data. Next, use Solidwork to model the design. Using the Finite Element Method (FEM), this program can investigate design characteristics. The loading simulation under consideration includes clutch engagement, bus brake application, and clutch engagement, whether the support is static or stationary. The validation with two supporting journals is then run as the following step to validate the findings. The constant chair support fulfills the typical value, according to the study's findings, whereas support 1 is the most fracture-prone. The outcomes of supports 2 and 3 demonstrate that the support strength is weak since it is subjected to an unequal load.
Co-Authors Basyirun Basyirun Fajar Budi Laksono Joko Triyono Joung Hyung Cho Muhayat, Nurul Rama Panji Kusuma Ridwan Ridwan