Kubilay ASLANTAŞ, Abdurrahman KARABULUT, İrfan UCUN

Ortagonal kesme işleminde takım-talaş temas uzunluğundaki değişimin araştırılması

Takım-talaş temas boyu, işleme prosesinde takım ömrü ve takım aşınması açısından önemli bir etkiye sahiptir. Takım-talaş temas boyundaki artış takım ömrünün azalmasına neden olabilir. Ayrıca takım-talaş temas boyu, krater aşınma davranışının önemli bir unsurudur. Takım-talaş temas boyunun artması, takım talaş yüzeyinde sürtünme kuvvetlerin artmasına neden olmakta ve kesici takım boyunca oluşan sıcaklık dağılımını etkilemektedir. Öncelikle bu çalışmada takım-talaş temas boyunun hesaplanması için kullanılan bütün analitik modeller birbirleriyle karşılaştırılmıştır. Daha sonra takım-talaş temas boyu, farklı iş parçası malzemesi ve kesme parametreleri için üç farklı model kullanılarak hesaplanmıştır. Takım-talaş temas boyu ile kesme hızı, malzeme tipi ve deforme olmamış talaş kalınlığı arasındaki ilişkinin anlaşılması için tornada bir seri deney yapılmıştır. Tornalama işlemleri ortagonal kesme koşulları altında ve seramik kesici takım kullanılarak gerçekleştirilmiştir. Elde edilen sonuçlara göre, artan ilerleme değeri ve malzeme türü takım talaş boyunu önemli oranda etkilemektedir.

Investigation of variation in tool-chip contact length in orthogonal cutting process

The tool-chip contact length has an important effect in view of tool life and tool wear in machining process. An increase in tool-chip contact length may results in a decrease of tool life. Besides the tool-chip contact length is an important element in formation of crater wear. The increasing of tool-chip contact length results in increase of friction forces acting on tool rake face and affects the temperature distributions along the cutting tool. First, in this study, all analytical models proposed to calculate the tool-chip contact length were compared with each other. Second, the tool-chip contact length was calculated using three different models for different workpiece materials and cutting parameters. The experiments were performed in a series of test in order to understand the relationship between tool-chip contact length and cutting velocity, material type and undeformed chip thickness. The turning tests were carried out under orthogonal cutting conditions and ceramic cutting tool was used. According to results, the increasing of feed rate and type of workpiece material have an important effect on the tool-chip contact length.

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