Influence of cutting parameters on drill bit temperature in dry drilling of AISI 1040 steel material using statistical analysis

Abstract

Purpose - An investigation of drilling temperature is essential in understanding the drilling mechanism of the material, thus improving the process efficiency. The aim of this study is to experimentally investigate influences of drilling conditions such as the drilling depth, feed rate and spindle speed on the twist drill bit temperature and thrust force in the dry drilling of AISI 1040 steel material using statistical techniques. Design/methodology/approach - Drill bit temperatures were measured by inserting standard thermocouples through the oil hole of TiN/TiAlN-coated carbide drills. The settings of drilling parameters were determined by using Taguchi experimental design method. An orthogonal array, the signal-to-noise (S/N) ratio, and the analysis of variance (ANOVA) were employed to analyze the effect of drilling parameters. The objective was to establish a model using multiple regression analysis between spindle speed, drilling depth and feed rate with the drill bit temperature and thrust force in an AISI 1040 steel material. Findings - Statistical results show that drill bit temperature was significantly influenced (at 95 percent confidence level) by drilling depth and spindle speed values. The spindle speed has smaller influence (7.66 percent) on the thrust force value. The feed rate has no significant influence on the drill bit temperature. Originality/value - in this paper, a new experimental approach was developed to measure drill bit temperature in dry drilling process.