| 摘要 |
A grinding machine (10) composed of a support table (12) for supporting an object (11) to be ground, a rotating shaft (13a) vertically arranged above the support table, and a grinding tool (40) connected to a lower end of the rotating shaft in parallel with the support table, in which the grinding tool is composed of a grind stone-holding member (32) on which a circular ultrasonic vibrators (31a, 31b) electrically connectable to an electric source are fixed and a circular grind stone (33) attached to a lower end of a periphery of the grind stone-holding member, in which the grind stone-holding member of the grinding tool has a continuous or discontinuous circular air space area (36) composed of multiple circular air space regions which are composed of circularly formed or arranged discontinuous air spaces between a position of the circular ultrasonic vibrator and a position at which the grind stone-holding member is connected to the rotating shaft, whereby the multiple circular air space area keeps an ultrasonic wave generated from the circular ultrasonic vibrator from linearly propagating to an area on an opposite side where the rotating shaft is connected, can grind an object to be ground with high precision because the ultrasonic wave generated in the ultrasonic vibrator is efficiently applied to the grind stone.
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