Bohrwerkzeug, insbesondere für metallische Werkstoffe

摘要

The drill has a cylindrical drilling body (1) with coaxial clamping shaft (2) at one end and cutting elements (7) at the other end which fit in a seat. Round the outside of the drill body is a grooved chipping area (14) opening at the cutter end into the end face (17) of the drill body and extending over the length of the body into the end of the clamping end. The cutting element fixed on the seat has an outer cutting corner adjoining the cutter (7a) and projecting radially over the circumference of the drill body. With cutting forces the cutters produce a radial force radially aligned in a certain angular position relative to the cutting element. The drill body is strengthened against elastic bending through the radial force by the design where the chipping area is divided into three axially adjoining sections (I,II,III) so that the first is grooved straight or inclined, the second is turned less than 90 deg. and the third is again straight.