TY - JOUR T1 - AISI 4340 Çeliğinin Isı Destekli Tornalanmasının Boyutsal Kararlılık ve Yüzey Pürüzlülüğüne Etkilerinin Deneysel ve İstatistiksel İncelenmesi TT - Experimental and Statistical Investigation of The Effects of Heat-Assisted Turning of AISI 4340 Steel on Dimensional Stability and Surface Roughness AU - Uğraş, Atakan AU - Kafkas, Fırat PY - 2024 DA - December Y2 - 2024 DO - 10.2339/politeknik.1409419 JF - Politeknik Dergisi PB - Gazi Üniversitesi WT - DergiPark SN - 2147-9429 SP - 2151 EP - 2159 VL - 27 IS - 6 LA - tr AB - Bu çalışmada iş malzemesinin boyutsal kararlılık özelliklerini ve yüzey kalitesini iyileştirmek için ısı destekli işleme (IDİ) yöntemi kullanılmıştır. Çevrimiçi ölçümler yapılarak kesme için harcanan güç (Pc, kW) ve iş malzemesi sıcaklığı (Tmr, °C) belirlenmiştir. Çevrimdışı ölçümlerde iş parçası çapı ölçülerek çap ölçüsündeki sapma (ÇÖS, µm) değeri belirlenmiş ve yüzey pürüzlülüğü (Ra, µm) ölçülmüştür. IDİ yönteminde kesme için harcanan güç (Pc) değerinde maksimum %14,43 azalma sağlanmıştır. Aynı kesme şartlarında ÇÖS değeri konvansiyonel işlemede 80 µm olarak gerçekleşirken, IDİ yönteminde 50 µm’ a düşmektedir. Yüzey pürüzlülüğü (Ra, µm) konvansiyonel işlemede 2,66 µm olarak gerçekleşirken, IDİ yönteminde 2,42 µm’ a düşmektedir. İstatistiksel analiz sonuçlarına göre ÇÖS ve yüzey pürüzlülüğü üzerinde en etkili işlem parametresi ilerleme oranı (f) olmuştur. Ancak IDİ yönteminin her ikisi üzerinde önemli bir etkiye sahip olduğu görülmüştür. Ön ısıtma, kesme ile eş zamanlı yapılamadığı için üretilen ısı iş malzemesi hacminde genleşmeye neden olmaktadır. Bu durum TIG esaslı IDİ yöntemini kullanarak hassas boyutsal toleranslara sahip parçaların işlenmesini zorlaştırır. KW - Isı destekli işleme KW - Boyutsal kararlılık KW - Yüzey pürüzlülüğü KW - TIG KW - AISI 4340 N2 - In this paper, to improve workpiece material dimensional stability properties and surface quality used heat-assisted machining method (HAM). Power consumed for cutting (Pc, kW) and work material temperature (Tmr, °C) were determined by online measurements. In offline measurements deviation value in diameter measurement (DDM, µm) was determined by measuring workpiece diameter, and surface roughness (Ra, µm) was measured. Through the HAM method, maximum reduction of 14.43% was achieved in the Pc value. While the DDM value is 80 µm in conventional machining in the same cutting conditions, it decreases to 50 µm in the HAM method. While the surface roughness (Ra, µm) value is 2,66 µm in conventional machining, it decreases to 2,42 µm in the HAM method. According to the statistical analysis results, the most effective process parameter on the DDM value and surface roughness is the feed rate (f). It is followed by the processing method. The HAM method was found to have a significant effect on both. Since preheating cannot be done simultaneously with cutting, the heat produced causes expansion in the volume of the work material. This makes it difficult to machine parts that have precise dimensional tolerances using the TIG-based HAM method. CR - [1] Ding H, Shin YC. "Laser-assisted machining of hardened steel parts with surface integrity analysis", International Journal of Machine tools and manufacture, 50:106114, (2010). https://doi.org/10.1016/j.ijmachtools.2009.09.001 CR - [2] Zhao C, Xia Y, Chen X, Jiang Y, He Y, Pan S. 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