Patent ID: 6379088
Filing Date: 2002-04-30
Classification: B23C,Y10S,Y10T

Abstract:
A multi-edged interchangeable cutting bit for the machining of a valve seat, comprising:a blank preground on parallel back and front faces, the blank having the shape of a rectangular trapezoid and including a rectangular positioning trihedron formed by three faces, including the back face, a rear face, and a first longitudinal face, the multi-edged interchangeable cutting bit further including a through-bore for the passage of a countersunk fastening screw with a conical head and at least one main cutting edge, for producing a conical bearing surface of the valve seat, with the main cutting edge diagonally opposite the rectangular positioning trihedron, the region formed by a second longitudinal face opposite to the first longitudinal face and a forward face opposite to the rear face, wherein a distance between the second longitudinal face and the first longitudinal face increases in a direction from the rear face to the forward face, and the blank is formed of sintered tungsten carbide after the first longitudinal face and the rear face of the rectangular positioning trihedron of the blank are formed.