What is it about?

The surface roughness model was developed in terms of main cutting parameters such as cutting speed, feed rate and depth of cut, using response surface methodology. Machining tests were carried out in turning AISI 1050 hardened steels by cubic boron nitride (CBN) cutting tools under different conditions. The model predicting equations for surface roughness of Ra, Rz and Rmax were developed using an experimental data when machining steels.

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Why is it important?

In metal cutting process, extensive attention has been given to machining of hard and hardened steels in an experimental way and theoretical method. However, the number of surface roughness prediction models for machining hardened steels is very limited.


The results indicate that the feed rate was found out to be dominant factor on the surface roughness, but it decreased with decreasing cutting speed, feed rate, depth of cut for these tools. In addition, average surface finish of Ra value produced by CBN cutting tool was about 0.823 μm when machining hardened steels. However, the Ra value decreased about 0.55 μm in terms of trial conditions. Moreover, a good agreement between the predicted and experimental surface roughness was observed within reasonable limit.

Prof.Dr. Ali Riza Motorcu
Canakkale Onsekiz Mart Universitesi

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This page is a summary of: Surface roughness model in machining hardened steel with cubic boron nitride cutting tool, International Journal of Refractory Metals and Hard Materials, March 2008, Elsevier,
DOI: 10.1016/j.ijrmhm.2007.02.005.
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