Östemperleme İşleminin CBN Kesici Takım Gerilmeleri Üzerindeki Etkisinin Nümerik Simülasyonu

Bu çalışmada, östemperleme işleminin kesici takım gerilmeleri üzerindeki etkisi incelenmiştir. Deneysel çalışmalardan elde edilen kesme kuvvetleri (esas kesme kuvveti, ilerleme kesme kuvveti ve pasif kuvvet) ANSYS Workbench programında, kesici takımdaki, talaş yüzeyi, esas kesici kenar ve yardımcı kesici kenar üzerine 3 boyutlu olarak uygulanmıştır. Östemperleme sürecinin rolünü vurgulamak için, ilk olarak Küresel Grafitli Dökme Demir (KGDD) numuneler 900°C de 60 dakika tuz banyosunda östenitlenmiş, daha sonra 60 dakika boyunca 250°C ve 325°C deki bir tuz banyosunda ısıl işlem yapılmıştır. Analizler sonunda, kesici takım üzerindeki eş değer gerilme (vonMises), kayma gerilmesi (Tresca), X, Y ve Z yönlerindeki normal gerilmeler heaplanmıştır.

Anahtar Kelimeler:

Metal kesme, sonlu elemanlar metodu, östemperlenmiş küresel grafitli dökme demir

Numeric Simulation of Effect on The CBN Cutting Tool Stresses of Austempering Process

In this study, we were investigated the effect of austempering process on the cutting tool stresses. The cutting forces obtained from experimental studies (main cutting force, feed force and passive force) were applied to rake face, main cutting edge, auxiliary cutting edge on the cutting tool as three dimensional in the ANSYS Workbench program. To emphasize the role of the austempering process, Ductile Iron (DI) specimens were firstly austenitized in salt bath at 900°C for 60 min, after which they were quenched in a salt bath at 250°C and 325°C for 60 min. The equivalent stress (von-Mises), shear stress (Tresca), normal stresses in the X, Y and Z directions on the cutting tool were calculated at the end of the analysis.

Keywords:

Metal cutting, finite element method, austempered ductile iron,

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