| 摘要 |
PURPOSE: A dry core drilling bit is provided to extend the life of a core drilling bit by discharging dust and frictional heat generated when drilling cement or concrete and to improve work efficiency by completing a cutting work easily by removing resistance by discharging air through an exhaust hole. CONSTITUTION: A dry core drilling bit(1) comprises many diamond tips(8) arranged around the lower end of a cylindrical shank(6) at regular intervals, at least one or more holes formed on the outside of the shank(6) to discharge impurities or compressed air easily, and at least one or more exhaust holes(2) incised in a spiral shape from the lower part to the upper part on the outside of the shank(6).
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