Abstract—Temperature monitoring and controlling is a critical aspect influencing the technical and economic success of metal cutting operations owing to the fact that it affects both the quality of the machined component and the performance of the cutting tool. The aim of this work is to investigate the influence of the cutting parameters on tool temperature when turning AISI 4340 steel under three cooling environments: flooding, minimal quantity lubrication and dry cutting. In addition to that, the specific cutting energy required under each cooling environment was measured using a modified impact testing machine, thus allowing the estimate of the temperature associated with the chip formation mechanism. Furthermore, it is aimed at verifying whether this test can replace force measurement using a dynamometer. The findings indicate that the lowest tool temperature was achieved under flood cooling, followed by minimum quantity lubrication and dry cutting. Inversely, lowest specific cutting energy was obtained when dry cutting, followed by minimum quantity lubrication and flooding, thus suggesting that the higher temperatures achieved under dry cutting aid the softening of the work material and the reduction of its shear strength.
Keywords—AISI 4340 steel, specific cutting energy, temperature, turning.
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