Performance evaluation of different process conditions when hard turning ASSAB 760

Abstract

The need to have more precision tolerances and better product surface roughness has driven the metal cutting industry to continuously improve the metal cutting processes. Surface roughness which is often is used to determine and evaluate the quality of a product, is one of the major quality attributes of a turned product. In order to obtain a better surface roughness, the proper setting of cutting parameters is crucial before the process takes place. Cutting parameters is very important to produce a good surface finish (surface roughness). Surface roughness and tool wear are influenced by cutting process conditions. This study was undertaken to investigate and evaluate the effect of different cutting parameters (cutting speed, feed rate and depth of cut) on surface roughness using the full factorial design of experiment when turning hardened ASSAB steel 760. The initial tool wear form was also investigated of cutting insert CNMG120408 NM4 WPP20. The experimental results indicate the proposed mathematical model suggested could describe the performance indicators within the limits of the factors being investigated. The feed is the most significant factor that influences the surface roughness. The secondary contribution follows by the interaction of feed and depth of cut that influences the surface roughness. The results and effects of cutting conditions factors and factors interactions on surface roughness are also presented in graphical form.