Yazar "Karakaya, Ismail" seçeneğine göre listele

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    Investigation of welding quality and internal elongation problem in aluminum extrusion
    (Elsevier Sci Ltd, 2023) Ayer, Onder; Karakaya, Ismail
    AA6082 aluminum alloys are particularly useful in heavy industry and machinery manufacturing given their mechanical properties, but when extruding complex profiles used in these sectors, one of the main problems is the welding problem. In order to prevent the welding defects by suitable die design, two different porthole extrusion die set were designed and manufactured using different design techniques in this study. Extrusion trials were conducted for each die. The analysis examined how die design affects profile exit temperature, stress and strain distribution, and billet interface. It also aimed to characterize the effect of die design on welding quality through tensile tests, hardness tests, and microstructural observations. The results show that tapering the mandrel and die plate parts at an angle causes compression of the material flow and reduces the volume of the weld chamber and helps to direct material to the critical regions. This design approach offers a solution for the welding problem of complicated profiles.
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    An Optimization Study for Bridge Design of a Porthole Extrusion Die
    (Lublin Univ Technology, Poland, 2019) Ayer, Onder; Ozmen, Burcu Gizem; Karakaya, Ismail
    In this study, a porthole die extrusion simulation was carried out for a box profile by using HyperXtrude Inspire Extrude Metal 2019 which is a FEM based software. Aluminum AA6063 material was the billet material, temperature of the billet was 450 degrees C and ram speed was selected as 5 mm/sec. The die design was obtained according to the shape of the bridges of the porthole die. Finally, the design optimization was achieved by analyzing FEM results. It was obtained that the dies which have curved bridges offer optimum process conditions.