Patent ID: 8485765
Filing Date: 2013-07-16
Classification: B23B,Y10T

Abstract:
1. An indexable insert for solid drills, having a supporting base ( 42 ), having four lateral supporting surfaces ( 44 ) projecting beyond the supporting base, and having four identical cutting edges ( 30 ) which are arranged at a distance above the supporting base ( 42 ), extend between in each case two cutting-edge corners ( 28 , 28 ″), are bounded by a respective tool face ( 46 ) and a tool flank ( 48 ) and of which in each case one is located in an active use position during the drilling operation, in the case of which the tool flank ( 48 ), at each point of the associated cutting edge ( 30 ), encloses a clearance angle (α) with a straight line ( 52 ) perpendicular to the supporting base ( 42 ), the clearance angle (α) varying along the cutting edge ( 30 ), characterized in that the clearance angle (α) increases from a relatively small value in the region of the cutting-edge corner ( 28 ′) to a maximum value and decreases over the rest of the cutting edge ( 30 ) as far as the other cutting-edge corner ( 28 ″), and in that the increase in the angle values from small to maximum value from one of the cutting-edge corners ( 28 ″) is more pronounced than from the other cutting-edge corner ( 28 ′).