ホブ切りにおける全面コーティング工具の摩耗挙動に及ぼす水溶性切削油剤の影響

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  • Influence of Water-Soluble Cutting Fluids on Wear Behavior of Fully Coated Tool in Hobbing

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In this paper, the wear behavior of (Al, Ti) N fully coated tools was investigated when using two kinds of water-soluble cutting fluids for hobbing, which were compared with city water and dry cutting. Experiments were carried out using a fly tool. The results helped clarify the following points; (1) A water-soluble cutting fluid containing synthetic lubricating additive is effective for the flank wear, which is smaller than that obtained when using the city water only. The flank wear obtained with the dry cutting is smaller than that obtained with the water-soluble cutting fluids tested. (2) The fluid containing synthetic lubricating additive retards the occurrence of crater wear on the coated rake face in comparison with the dry cutting, and its crater wear ia also small. (3) It was suggested that the crater wear mechanism of fully coated tool is that first, the delamination and/or the seizure of the coating film caused by thermal fatigue occurs, and after appearing the substrate, the crater wear increased by the abrasive action with the cutting chips.

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