Optimization of Cutting Parameters in Hard Turning of AISI H10A Steel under Minimum Quantity Lubrication

Abstract

In this study, influences of cutting parameters in hard turning of hot work tool steel by applying minimum quantity lubrication (MQL) were investigated and optimized by using Taguchi methodology. Firstly, the machinability experiments on hardened AISI H10A hot work tool steel with CBN inserts were performed under the MQL condition. The experiments were carried out by Taguchi’s L9 orthogonal array. The machinability of AISI H10A steel were evaluated in terms of average surface roughness (Ra) and main cutting force (Fc). The analysis of variance (ANOVA) was applied to determine the effects of cutting parameters (cutting speed, feed rate and depth of cut) on surface roughness and cutting force. It was observed that surface roughness and cutting force increased with increasing feed rate and depth of cut in machining by applying MQL with uncoated CBN inserts. Depth of cut was determined as the most important parameter on surface roughness with 66.57% PCR while feed rate was determined on cutting force with 50.68% PCR. On the other hand, optimum cutting parameters for surface roughness and cutting force were found at different levels as a result of Taguchi optimization.