Drilling device and drilling method
AssigneesMitsubishi Materials Corporation, Nippon Diamond Co., Ltd.
InventorsKusuo Sato, Shigeru Mazaki, Toshio Imaoka
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Abstract
A drilling device is composed so as to drill a drilled object composed of a brittle material with the end of a rotating core bit by using a core bit in which a bit, formed by dispersing and arranging a cemented carbide or super abrasive in a binder phase, is provided on the end of a cylindrical tube, and rotating the core bit around an axis with a direct motor. The drilling device is composed so that the core bit is rotated such that the peripheral velocity at the outer periphery of the bit is 300 m/min or more while the core bit presses against the drilled object at a pressure of 0.6 N/mm2 or more during drilling.
Claims7
A drilling method for drilling a drilled object composed of a brittle material by rotating around an axis a drilling tool comprising a cylindrical tool body and a ring-shaped bit which is formed on an end of the cylindrical tool body and contains abrasive grains and pressing the ring-shaped bit of the rotating drilling tool against the drilled object;
- wherein,
- the drilled object is drilled by pressing the bit against the drilled object at a predetermined pressure of 0.6 N/mm2 or more while maintaining the peripheral velocity at the outer periphery of the bit at 300 m/min or more.
Dependencies are inferred from the claim text.