AN STUDY ON SELECTING CUTTING REGIME TO ATTAIN SUITABLE ROUGHNESS AND DIMENSIONAL PRECISION IN BOTH WHEN HARD TURNING TEMPERED ALLOY STEEL

Abstract

The paper presents an experimental study about the influence of cutting regime
parameters (cutting speed, feed rate, depth of cut) on two performance
characteristics: surface roughness and dimensional precision when hard turning the
tempered alloy steel on the CNC lathe by PCBN tool. Taguchi technique and analysis of
variance (ANOVA) in designing experiment and analyzing results has been applied to
define the contribution of cutting regime parameters on the characteristics. Taguchi L9
design matrix with nine experimental runs was conducted to define sets of optimized
parameters for each under the experiment conditions. The combination of Taguchi
method and grey relation analysis (GRA) was also performed to solve multi object
optimization. A set of optimized cutting regime parameters have been defined, that
allow to get both low surface roughness and high dimensional precision. An aplication
study case is introduced, too. The optimized parameters have been applied to
machine the intake valve of the internal combustion engine, effectively.