パルス状CO₂レーザビーム照射による脆性工具の耐熱衝撃性評価 : 熱き裂発生に及ぼすレーザビーム照射停止時間の影響(機械要素,潤滑,工作,生産管理など)

抄録

As a basis for improving the thermal shock resistance of brittle tools in high-speed intermittent cutting from the cutting condition's viewpoint, pure thermal shock was applied to the rake face of a cemented carbide tool by CO₂ pulse laser beam irradiations. The states of thermal crack appearance were observed with a high-speed video camera. The crack was generated during laser beam irradiation off time within 1/9000 s. The influence of the off time was examined experimentally on the number of irradiation cycles to the thermal crack initiation. A decrease in the off time caused an increase in the number. This was more remarkable in cutting edge laser beam irradiation, which corresponds to intermittent cutting, in comparison with internal laser beam irradiation. The cutting edge irradiation was a more difficult condition of the crack generation.