THROWAWAY TIP FOR DRILLING, AND THROWAWAY TYPE DRILLING TOOL

摘要

PROBLEM TO BE SOLVED: To obtain the stable behavior of a cutting edge, and reduce the cutting resistance. SOLUTION: A plurality of groove parts 30 are formed at substantially equal intervals on a margin part 19 of a side surface 18 adjacent to a flank 13 of a tip along the thickness direction of a tip body 10. In a condition that the tip is fitted to a body 1 of a drilling tool, the groove parts 30 arranged so as to be extended in the same direction as the rotational direction T of the tool body 1.