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    An approach for calculation of press loads in closed - die upsetting of gear blanks of gear pumps
    (Elsevier Sci Ltd, 2007) Altinbalik, Tahir; Akata, H. Erol; Can, Yilmaz
    Some results of an industrial research and development project aimed to develop the manufacturing technologies of gear pumps were presented. Gear blanks of gear pumps that have traditionally been produced by machining from round bars in an industrial company were closed-die forged as an alternative. A comparison method of mechanical properties of the manufacturing methods was published formerly. A classical method was applied to calculation of press loads in closed-die upsetting of gear blanks of gear pumps and results were compared with those of measured in the experimental part of the work. Commercially pure lead was used as test material. In addition to comparison of calculated and measured loads, contributions of the method applied on the manufacturing costs of gear blanks were also discussed in the study. (c) 2005 Elsevier Ltd. All rights reserved.
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    A COMPARATIVE STUDY FOR OPEN DIE FORGING-EXTRUSION PROCESS OF CLOVER-SHAPED AND RECTANGULAR-SHAPED ALUMINUM ALLOY
    (Univ Tech Gheorghe Asachi Iasi, 2010) Misirli, Cenk; Can, Yilmaz
    This paper overviews the metal forming process which is called forging-extrusion process. The aim of this process is manufactured of near net shape of many produce. In this study, two different shaped upper dies were used. A199.7 aluminum alloy was used for experiments. Aluminum billets which having same initial heights have been extruded with the same strokes. The forging loads were measured different deformation rate. Some of aluminum billets were lubricated and formed. Lubricated specimens were compared with the other specimens. The effect of metal forming process on the hardness distribution along the radial direction was investigated both of different geometries and lubricated conditions. In addition, the microstructures were investigated for clover shaped samples and rectangular shaped samples using transmission electron microscopy (TEM). It was found that both clover shaped samples and rectangular shaped samples have similar mechanical properties. The corresponding microstructure consisted of a mixture of elongated subgrains with dimensions similar to those observed in the initial billet. It is suggested that there is no considerable differences between two different geometries in terms of microstructure and lubrication.
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    Determination of the Change in Electrical Conductivity of Single, Bimetallic and Trimetallic Cylindrical Billets with Plastic Deformation Induced by Upsetting Process
    (Univ Osijek, Tech Fac, 2022) Cetintav, Isik; Misirli, Cenk; Can, Yilmaz
    In this study, measurement of the effect of singular, bimetallic and multimetallic materials exposed to cold plastic deformation on electrical conductivity properties was investigated. The main subject of this research is plastic deformation occurring in the upsetting process and changing the conductivity properties of the parts. In the experiments, steel, aluminium, copper, brass, bimetallic and multimetallic materials designed with different combinations of these materials were used as test materials. Experimental upsetting tests were performed as a height reduction ratio 10%, 20% and 30%. The electrical conductivity measurement results of the deformed samples were obtained with a conductivity measuring device. The results obtained from the experiments are presented in graphs with electrical conductivity axis that change due to deformation. As a result of the experiments and measurements, it was concluded that the electrical conductivity of the deformed materials generally decreased slightly due to the plastic deformation of the deformed materials, and the bimetallic and multimetallic materials were similar to the properties of the majority material.
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    An experimental study of lateral extrusion of splines
    (Elsevier Sci Ltd, 2006) Altinbalik, Tahir; Can, Yilmaz
    The aim of this study is to investigate the lateral extrusion of splines in terms Of load requirement and die filling. The prediction of forming load and pressure is an important task in metal forming. The upper bound method has been employed to investigate the load requirement for different process parameters, to this effect, kinematically admissible velocity fields have been developed. A series of experiment has been carried out using solid lead billets with two different diameters. The theoretical prediction of forming load is compared with experimental results. The predicted load values are higher than the experimental values during the tooth formation period but lower than the experimental values during the corner filling stage. Metal flow in the tooth region is not uniform and barreling occurs due to frictional resistance between the workpiece and the die gap surface. The barrel profile is assumed as a second order polynomial and a simple empirical relationship between the tooth dimensions and the barrel profile has been given using experimental data. (c) 2005 Elsevier Ltd. All rights reserved.
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    AN INVESTIGATION OF UPSETTING OF BIMETALLIC METALS
    (Modtech Publishing House, 2011) Misirli, Cenk; Can, Yilmaz
    Upsetting is simplest but primary metal forming operation. Upsetting of single materials such as aluminum, steel, copper and porous materials has been investigated many researchers in terms of friction, barreling effect and contact pressure distributions due to its relevance in metal forming. Also different shapes such as elliptical and polygonal shapes have been studied. In this paper, upsetting of composite or in other words bimetallic metals were studied experimentally. Cylindrical specimens consisting of two different materials were used in the experiments. Specimens were prepared as aluminum sleeve and copper core and upset at different reduction. This metal combination present a material model of which chemical composition is different.
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    Numerical Investigation of Heat Transfer in Friction Welding of Cylindrical Tubes
    (Begell House Inc, 2009) Can, Yilmaz; Kahveci, Kamil; Cihan, Ahmet
    Heat transfer in friction welding of cylindrical tubes is considered in the present study and the governing equations are solved numerically using an explicit finite difference technique to determine the temperature field. The values of the radius ratio in the problem are selected as r(r) = 0.25, 0.50, and 0.75. Results show that the temperature of tubes increases with increasing radius ratio. In addition, as the generated heat is proportional to the interface radius, the temperature increases from the inner surface but drops slightly towards the periphery due to the convection effect. The temperature field is of a similar form for all values of the radius ratio, but the radial and axial temperature gradients change at certain amounts.
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    On properties at interfaces of friction welded near-nanostructured Al 5083 alloys
    (Springer London Ltd, 2012) Sahin, Mumin; Balasubramanian, N.; Misirli, Cenk; Akata, H. Erol; Can, Yilmaz; Ozel, Kaan
    Equal-channel angular pressing is a material processing method that allows very high strains to be imposed, which leads to extreme work hardening and micro-structural refinement, with minimal change of external sample dimensions. It offers possibilities of good mechanical properties, such as high strength and ductility, while allowing flexibility of choice of alloy composition for better corrosion behavior, lower materials costs, and so on. This study characterizes for the first time the microstructure and properties of aluminum friction welded after severe plastic deformation via the equal-channel angular pressing method. In this study, 5,083 aluminum alloys, which were exposed to severe plastic deformation using square cross-sectional equal-channel angular pressing die, were joined with friction welding method. It was found that tensile and fatigue strengths of severe plastic deformed and welded specimens were higher than those of the purchased specimens. Hardness values were also consistent with the strength results. However, the refining of grain size as shown from microstructures results in a significant increase in hardness and mechanical properties.
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    An upper bound analysis and determination of the barrelling profile in upsetting
    (Natl Inst Science Communication-Niscair, 2011) Altinbalik, Tahir; Can, Yilmaz
    The aim of this work is to investigate the barreling of aluminium cylinders having two different aspect ratios in terms of barrel profiles and required loads. A modified upper bound solution including a dimensionless optimizing parameter for uniaxial upsetting has been developed and the loads calculated thereby have been compared with the results of several experiments conducted. Furthennore, the barrel profile is firstly assumed as a second-order polynomial for the upsetting process and an empirical correlation between the billet dimensions and the barrel profile has been established using experimental data. AA6082 is used as test material. The experiments are carried out on a 150 metric ton capacity hydraulic press. Besides, the bulging profile and effective strain distribution of the billets are obtained with a commercially FEM program called DEFORM 3D.