DRILLING TOOL WITH ROUNDED INSERT SUPPORT SURFACES

摘要

A drilling tool for ejector drilling comprises tangentially located cemented carbide cutting inserts (10A, 10B, 10C), preferably three. This simplifies the making of the insert pockets quite considerably. Further, the semi-circle formed basic shape of the cutting inserts is very favourable when they are pressed. Preferably, there is a turned-out chip space (13) in the end of the central hole in order to minimize the risk for chip jamming. Preferably, the drill is made of one single piece.