Investigation of Machinability Characteristics of Al-9Si-0.1Sr-0.6Mg Alloy in Turning

Year 2023, Volume: 15 Issue: 2, 517 - 525, 14.07.2023

Ali Paşa Hekimoğlu , Şenol Bayraktar

https://doi.org/10.29137/umagd.1257926

Abstract

The Al-9Si-0.1Sr-0.6Mg alloy examined in this study was produced by the permanent mold casting method. The chemical composition of the produced alloy was confirmed by inductively coupled plasma atomic emission spectroscopy method. Microstructural examinations were carried out on the samples prepared by standard metallographic methods. These samples were examined without etching and photographed. In the metallographic examinations, it was observed that the microstructure of the alloy consisted of primary aluminum (Al) dendrites, eutectic Al-Si phase regions containing spherical silicon (Si) particles, primary Si particles, Al4Sr and π phases. Machinability tests were carried out under different cutting speed (250, 400 and 550 m/min), feed rate (0.05; 0.15 and 0.25 mm/rev) and constant depth of cut conditions using uncoated carbide inserts. The cutting force components were measured with the Kistler 9273 dynamometer and the average surface roughness values were measured with the Mahr Perthometer device with a tracer tip. As a result of the tests, it was determined that the cutting force, average surface roughness and built-up edge formation decreased with the increase of cutting speed, while it increased with the increase of feed rate. It was found that cutting speed of 550 m/min and feed rate of 0.05 mm/rev parameters could be used for minimum cutting force, average surface roughness and built-up edge formation.

Keywords

Al-9Si-0.1Sr-0.6Mg alloy, Cutting force, Average surface roughness, Built-up edge

Al-9Si-0.1Sr-0.6Mg Alaşımının Tornalanmasında İşlenebilirlik Karakteristiklerinin Araştırılması

Abstract

Bu çalışmada incelenen Al-9Si-0.1Sr-0.6Mg alaşımı kokil kalıba döküm yöntemiyle üretildi. Üretilen alaşımın kimyasal bileşimi indüktif eşleşmiş plazma atomik emisyon spektroskopisi (ICP-OES) yöntemiyle doğrulandı. İçyapı incelemeleri standard metalografik yöntemlerle hazırlanan numuneler üzerinde dağlama yapılmadan gerçekleştirildi. Metalografik incelemelerde alaşımın içyapısının birincil alüminyum (Al) dendritlerinden, küresel morfolojiye sahip silisyum (Si) parçacıkları içeren ötektik Al-Si faz bölgelerinden, ötektik dışı Si parçacıklarından, Al4Sr ve π fazlarından oluştuğu gözlendi. İşlenebilirlik testleri, kaplamasız karbür kesici uçlar kullanılarak farklı kesme hızı (250, 400 ve 550 m/dak), ilerleme (0,05; 0,15 ve 0,25 mm/dev) ve sabit kesme derinliği şartları altında gerçekleştirildi. Kesme kuvveti bileşenleri, Kistler 9273 dinamometre ve ortalama yüzey pürüzlülüğü değerleri ise izleyici uçlu Mahr Perthometer cihaz ile ölçüldü. Testler sonucunda kesme hızının artması ile kesme kuvveti, ortalama yüzey pürüzlülüğü ve yığıntı talaş (YT) oluşumu azalırken, ilerlemenin artması ile arttığı belirlenmiştir. Minimum kesme kuvveti, ortalama yüzey pürüzlülüğü ve YT oluşumu için 550 m/dak kesme hızı ve 0,05 mm/dev ilerleme parametrelerinin kullanılabileceği tespit edilmiştir.

Keywords

Al-9Si-0.1Sr-0.6Mg alaşımı, Kesme kuvveti, Ortalama yüzey pürüzlülüğü, Yığıntı talaş

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