CUTTING TOOL FOR CUTTING HOLE EDGE PART

摘要

The present invention relates to a cutting tool for cutting the edge of a hole. The cutting tool comprises: a connection shaft (10) formed of a vertical structure and connected to a shaft rotating device (Not shown) rotated at high speeds; a body part (20) arranged at the bottom of the connection shaft (10); a cutting part (30) arranged at the bottom of the body part (20) and composed of a pair of cutting blades (31) and a pair of cutting passages (32); a hole center maintaining part (40) arranged at the bottom of the cutting part (30); a hole entrance guide part (50) arranged at the bottom of the hole center maintaining part (40); and a pair of chip discharging passages (60) arranged close to the pair of cutting blades (31) of the cutting part (30) to discharge upward cut chips. Especially, the height of the body part at a portion extended from the cutting blades is the longest, but is gradually narrowed along the circumferential direction. Accordingly, the height of the cutting passages positioned at the bottom of the body part is relatively extended along the rotation direction. Thus, the present invention can drastically reduce work time and the number of processes to improve workability by fundamentally processing the edge of a hole with a single cutting tool and can relieve the risk of safety accidents by removing an additional grinding process. Also, the present invention can easily process the hole by preventing the cut surfaces from interfering with the top of the cutting passages.