THROWAWAY TYPE DRILL AND THROWAWAY TIP MOUNTED THEREON

摘要

PROBLEM TO BE SOLVED: To sufficiently relax stress caused by cutting torque. SOLUTION: This tip includes: a shaft part 36 projected from the rear end face 32 of a tip body 30 toward the rear end in the direction of an axis O; a torque bearing surface 35B intersecting the rear end face 32 and the forward end face 31 of the tip body 30, and intersecting the outer peripheral surface 30A of the tip body 30 and pointing the backside in the rotating direction T of a drill; and a clamp receiving surface 35A adjacent to the torque bearing surface 35B. COPYRIGHT: (C)2005,JPO&NCIPI