Abstract
This paper deals with the influence of viscosity of oil on flank wear, crater wear and finished surface roughness with minimal quantity lubrication (MQL) system, when using an (Al,Ti)N fully coated tool in hobbing. Experiments were carried out using a fly tool. The results obtained are summarized as follows. (1) The flank wear and the crater wear increased with an increase in viscosity of oil in the range from 19.1 mm2/s to 24.2 mm2/s, and since then, they decrease with increasing in the viscosity from 24.2 mm2/s to 47.6 mm2/s. The flank wear obtained with the oil having viscosity of 19.1 mm2/s is smaller than that obtained by dry cutting. (2) All the oils tested decreased finished surface roughness in comparison with dry cutting. (3) From the viewpoints of the primary performance such as tool wear and finished surface roughness, and the secondary performance of the oxidation stability, the oil having low viscosity of 19.1 mm2/s showed the best performance within the range of viscosity of the oil tested.
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