Patent ID: 8845243
Filing Date: 2014-09-30
Classification: B23B,B23D,Y10S,Y10T

Abstract:
1. A reaming tool, comprising: a driving rod; a head that has a rotationally symmetrical basic shape and is equipped with one or more detachable cutting inserts; and a clamping member for each of the one or more detachable cutting inserts, wherein the head comprises front and rear end surfaces, an envelope surface concentric with a centre axis (C), and a seat for each of the one or more detachable cutting inserts, each seat countersunk in the envelope surface and includes three support surfaces, one of which is a radial support surface and another one a tangential support surface, wherein each detachable cutting insert is held fixed in the seat by means of the clamping member, wherein each detachable cutting insert has the shape of a mirror-symmetrical polyhedron comprising six limiting surfaces, two opposite and mutually parallel ones of which are equidistantly separated from a central symmetry plane (SP 1 ) and form chip surfaces that connect to limiting surfaces serving as clearance surfaces via alternately usable, identical cutting edges, wherein each detachable cutting insert has a rhombic cross-sectional shape in the symmetry plane (SP 1 ) and includes four clearance surfaces, which meet each other in pairs at obtuse angles (β) in two opposite corners, and which, along each individual chip surface, together with the same, form two cutting edges alternately usable by the indexing of the detachable cutting insert, and wherein each seat, in addition to the radial and tangential support surfaces, includes a slope surface that forms an obtuse angle with the radial support surface.