فهرست نشریات علمی دسترسی آزاد ایران

 End-milling is a cutting technology that removes material from machined workpieces by end mill and is widely used to manufacture parts. Also, nitriding is a surface hardening process with a lot of effects on mechanical properties like damping ratio. This study investigated the effect of gas nitriding on a nitrided end mill in comparison with an unnitrided end mill and showed a 22 and 23 percent decrease on average in peak values and Root Mean Square values respectively. This improvement can be a result of increasing damping ratio or stiffness or two parameters simultaneously. In the next step, Modal analysis was carried out on two nitrided and unnitrided samples, and the damping ratio and natural frequency were measured by constant young modulus and showed a 14 percent increase in damping ratio without any significant change in natural frequency. Moreover, by modeling and analyzing the 3D model of indexable end mills It was verified that nitriding can have a 3 percent effect on increasing natural frequency at maximum. As a result, It concluded that the reported vibrational improvement of nitrided indexable end mill was due to improving damping ratio of steel not increasing natural frequency. In this regard, nitrided indexable end mills lead to improvement in machining efficiency, reducing energy consumption, manufacture of high-quality parts and it will ultimately reduce costs.