MQLによるホブ切りにおける超硬合金ホブ材種の影響 : —すくい面にコーティングがない場合の舞いツールによる基礎実験—

概要

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This paper deals with the influence of various cemented carbide hob materials coated with TiN and (Ti,Al)N films, which are no coating on the rake face by grinding, on flank wear (tool life), crater wear and finished surface roughness in hobbing with minimal quantity lubrication (MQL) system compared with dry cutting. Experiments were carried out by simulating hobbing by fly tool cutting on a milling machine. As a consequence, the following results were obtained. (1) The tool failures do not occur with the TiN-coated P20 and P30 hob materials both in dry cutting and with MQL system, which showed the stable cutting. The flank wear obtained with the P30 is smaller than that with the P20, and the P30 also showed a good performance in the case ofthe coated (Ti,Al)N film. The MQL system showed the flank wear reduction effect compared with dry cutting. (2) The crater wear reduction effect by MQL system was recognized, and moreover the MQL system decreases the occurrence of the thermal cracks on the rake face. (3) The MQL system improves the surface roughness, even if the kinds of cemented carbide hob materials and the coating films were changed. (4) From the viewpoints of the flank wear, the crater wear and the finished surface roughness, the MQL system is effective for the cutting tool of (Ti,Al)N-coated P30, as a hob material.