| 摘要 |
A boring such as a high accuracy boring is performed by inputting vibration only in the moving direction of a tool. The device comprises an ultrasonic horn ( 1 ) functioning as a vibrator, a punch ( 2 ) functioning as a boring tool for boring a work (W) which is an object to be bored, a guide bush ( 3 ) guiding the punch ( 2 ) in the moving direction, an elastic body ( 4 ) for retaining the punch ( 2 ) in a floating state on the guide bush ( 3 ), and a die ( 5 ) functioning as the boring tool formed in pairs with the punch ( 2 ). The punch ( 2 ) is floatingly retained by the elastic body ( 4 ) inside the guide bush ( 5 ), and vibration is applied to the punch ( 2 ) by the ultrasonic horn ( 1 ) to make the punch ( 2 ) jump toward the work (W) to strike the work (W) for boring the work (W).
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