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Öğe Analyzing The Effects Of Different Tool Paths On Form Errors In The Milling Of Freeform Surfaces(Yıldız Teknik Üniversitesi, 2020) Bahçe, Erkan; Özdemir, BurakMachining of free-form surfaces is an important place in terms of design and performance in transportation,electronics and aeronautical industry. Problems such as form error and surface roughness were frequently encountered in the manufacture of these surfaces. For the solution of the problems, reprocessing is done, which causes time and resource loss. To eliminate these losses, the parts must be produced in the desired quality at one time. In order to find out the causes of form errors and to remove the adverse effects, the distribution on the surface must be determined correctly. Form errors should be examined in a way to cover the point, region and the whole part. In this study, a surface created with B-Spline curve has been processed with different tool paths. Surfaces were scanned in 3D and form errors were determined. Point, regional and whole parts are examined and the tool path that creates minimum form error is determinedÖğe Burr measurement method based on burr surface area(Korean Society for Precision Engineering, 2020) Bahçe, Erkan; Özdemir, BurakOne of the major issues of drilling operations pertains to the formation of burrs, which greatly influences the accuracy of the manufactured parts, and, thus, the capability to meet the desired performance of the part. To remove or prevent these burrs, their geometry must be measured accurately, even though they are sharp and irregular in shape. The accurate measurement of the geometry of a burr will lead to the development of a proper deburring method. In this work, the authors describe a simple and convenient new measurement technique for drilling burr profiles and a developed drilling burr measurement system based on surface area. The new method presented in this research aims at providing a comparative evaluation of the height, arc length and area of the burr, as well as its geometrical characteristics. When the average height and arc length measurement methods are compared with the area measurement method, large deviations in burr height are detected. In particular, these deviations increase more in non-uniform burrs. In the measurement of burr size, the new developed method is based on area measurement and is carried out using a computer. Therefore, there is no deviation between the measurements. In contrast, the average deviation ranges for the height and arc length measurement methods are found to be 9.94–48.14% and 6.07–18.82%, respectively.Öğe Estimation of Forces in Longitudinal and Multi-Pass Milling of GFRP and ABACA Composites Utilizing Machine Learning Techniques(SAGE Publications Ltd, 2026) Özdemir, Burak; Emir, Ender; Bahçe, Erkan; Yardımeden, Ahmet; Kılıçkap, ErolIn this study, workpieces made of glass fibre reinforced polymer and ABACA composite materials were machined by longitudinal and multi-pass milling methods with three different feed and speed parameters. The effect of milling methods on the finish surface was discussed through microscope images. The effect of machining parameters on the force was analysed by measuring the force values changing during machining. For this purpose, advanced prediction modelling was performed with the Random forest machine learning method. The effect of machining methods and parameters on cutting force is predicted with an average success rate of 86%. The primary contribution of this research lies in providing a comparative assessment of natural and polymer composites under distinct milling conditions and introducing a data-driven approach for accurate cutting-force prediction. The findings provide new insights into the processing of natural fibre composites as an alternative to polymer composites in milling. © The Author(s) 2025Öğe Forecasting Initial Exit Point and Attributes of Burr Formation in Drilling of Free-Form Surfaces(Karyay Karadeniz Yayımcılık Ve Organizasyon Ticaret Limited Şirketi, 2026) Özdemir, BurakThe initial exit point (IEP) denotes the first location where the tool emerges from the underside of the workpiece during drilling and has a substantial influence on burr formation. This effect becomes particularly pronounced when the underside of the workpiece is not flat. In such cases, unfavorable IEP positioning may lead to increased burr height, unstable material separation, and non-uniform exit deformation, thereby deteriorating surface quality and increasing the need for secondary deburring operations. The IEP, together with the tool initial position (TIP), is governed by the tool’s starting placement, workpiece thickness, feed rate, and spindle speed, all of which are highly adjustable parameters. In this study, burr formation during the drilling of a B-spline free-form surface was investigated by mathematically modeling the tool cutting edge tip with respect to the IEP. The proposed model was developed in the MATLAB environment and experimentally validated on a workpiece containing a B-spline surface. The results demonstrate that accurate prediction and control of the IEP enable effective regulation of burr formation on free-form surfaces. By optimizing drilling parameters, burr height was significantly reduced, achieving an average decrease of 27.8% when the exit occurred near the tool tip region compared to exits between the tip and diameter edge. These findings highlight both the critical role of the IEP in burr generation and the necessity of its careful control in drilling operations on non-flat surfaces.Öğe Karbon fiber kaplamalı tpms kafes yapılarının basma testi analizi(Dicle Üniversitesi, 2025) Akbay, Özgün Ceren; Özdemir, Burak; Bahçe, Erkan; Oymak, Mehmet AkifEklemeli imalat, karmaşık geometrilere sahip hafif ve yüksek performanslı yapılar üretme imkânı sunan yenilikçi bir üretim teknolojisidir. Bu teknolojinin öne çıkan uygulamalarından biri olan Triply Periodic Minimal Surface (TPMS) yapılar, düşük yoğunluk, yüksek yüzey alanı, enerji emilimi ve mekanik dayanım gibi avantajlar sağlamaktadır. Ancak, eklemeli imalatla üretilen TPMS yapılarının mekanik dayanımı, uygulama gereksinimlerini karşılamakta yetersiz kalabilmektedir. Bu bağlamda karbon fiber kaplama, TPMS yapılarının mekanik dayanımını ve sertliğini artırarak yük taşıma kapasitesini iyileştiren etkili bir çözüm olarak öne çıkmaktadır.Bu çalışma, karbon fiber kaplamalı TPMS kafes yapılarının mekanik performansını incelemiş ve farklı geometrik tasarımların enerji emme kapasitesi, yük taşıma dayanımı ve elastik modül üzerindeki etkilerini değerlendirmiştir. Octet geometrisi, 1250 J enerji emme kapasitesi ve 500 N maksimum yük taşıma dayanımı ile en yüksek performansı sergilerken, elastik modül açısından diğer geometrilere kıyasla daha düşük bir değer göstermiştir. HMK (1100 J, 450 N), YMK (950 J, 400 N) ve Elmas (850 J, 350 N) geometrileri ise dengeli performanslarıyla farklı uygulama alanları için uygun seçenekler sunmaktadır.Sonuç olarak, karbon fiber kaplama, TPMS yapılarının mekanik özelliklerini optimize ederek havacılık, otomotiv, biyomedikal ve enerji gibi sektörlerde hafiflik, dayanıklılık ve çok işlevlilik gerektiren uygulamalarda geniş bir kullanım potansiyeli sunmaktadır.Öğe Mechanical characterization of lattice structure produced by additive manufacturing under torsion and compression(SAGE Publications Ltd, 2024) Akbay, Özgün Ceren; Özdemir, Burak; Bahçe, Erkan; Emir, Ender; Uslu Uysal, MineIn the present paper, the torsion and compression behaviors of lattice structures were studied. The PLA (Polylactic Acid) materials were used in assembly and produced by additive manufacturing method. The structure and lattice behaviors were investigated by Digital Image Correlation (DIC) system during experimental study. Models created using three different unit cell model as Trunch Octa Dense, Trunch Octa Light, Body Diagonals With Nodes and two different, 70 mm and 140 mm, total length size. The influence of the unit cell model, cell size on the strength of the structure were studied by compression and torsion experiments. The maximum compressive stress and maximum torsion were obtained and their deformations were presented. The highest maximum torque was determined in Body Diagonals With Nodes cell model and 140 mm due to the fact that the cell model structure compatible with torsion. The highest compressive stress was determined in Trunch Octa Light cell model and 140 mm cell length. © The Author(s) 2023.
