BTA DRILL HEAD FOR A DEEP HOLE DRILLING TOOL FOR BTA DEEP HOLE DRILLING AND DEEP HOLE DRILLING TOOL

摘要

A drill head (100) for a deep hole drilling tool for BTA / STS or ejector hole drilling comprising a body (101) of a drill head, a cutting edge (109), and guide pads (110, 111) (101) is rotatable about an axis of rotation (113) and has a hollow conduit (107) with a chip collection orifice (106) on the perforated side (160) and the perforated side (160) 109 are disposed on the upper side and have a ridge 114 of the main cutting edge and a ridge 115 of the minor cutting edge and the minor cutting edge is arranged on the outer side in the radial direction of the cutting edge, The ridge portion 114 and the ridge portion 115 of the minor cutting edge form the cutting edge corner portion 120 and extend across the rake face 108 disposed adjacent to the chip picking orifice 106, The first guide pad 111 is disposed within a half of the circumference facing away from the rake face 108 of the body 101 of the drill head Second guide pad 110 is disposed so as to face in the radial direction on the cutting edge corner portions 120. In this case, the first guide pad 111 is arranged to be offset with respect to the cutting edge corner portion 120 by the angle 112 of the guide pad measured in the circumferential direction of the drill head 100. According to the present invention, the angle of the guide pad 112 is less than 70 degrees.;