Abstract
This paper deals with the influence of various coating films of high-speed steel tool on tool life (flank wear) in hobbing with dry cutting and minimal quantity lubrication (MQL) system when changing the hob feed. Experiments were conducted by simulating hobbing by fly tool cutting on a milling machine. The results are summarized as follows. (1) In the case of hob feed of 1.5 mm/rev, TiN-coated tool is effective for dry cutting and AlCrSiN-coated tool is effective for MQL system. (2) With 4.0 mm/rev, TiSiN-coated tool is suitable for dry cutting and TiAlN and AlCrSiN-coated tools are suitable for MQL system. Especially, an AlCrSiN-coated tool showed the tool life obtained with MQL system more than twelve times compared with dry cutting.
