THROW AWAY END MILL AND THROW AWAY TIP USED FOR THE SAME

摘要

PROBLEM TO BE SOLVED: To improve chip processing during drilling work in a throw away end mill which enables three-dimensional cutting.;SOLUTION: The throw away end mill has first and second tips comprising respective short and long cutting blades 6, 7 at respective crossing ridges between each side surface 4 of a polygonal plate-shaped tip body and each upper surface 5 thereof at the top part of an almost columnar tool body. The first chip is mounted on the tool body with the long cutting blade as a peripheral blade and the short cutting blade as a bottom blade. The second tip is mounted on the tool body with the long cutting blade as the bottom blade and the short cutting blade as the peripheral blade. The first tip has a breaker wall 13a along the the bottom blade on its rake wall 11. The bottom blade is formed in a recess shape to gradually reduce thickness toward its center in the top face view of the tool body. The breaker wall is formed in a protruding shape to gradually increase thickness toward its center.;COPYRIGHT: (C)2004,JPO