Patent ID: 7325471
Filing Date: 2008-02-05
Classification: B23B,Y10T

Abstract:
1. A toolholder adapted to accept a cutting insert having a forward end, a tapered shank and a rearwardly facing face thereon with a passageway extending completely through the insert, wherein the toolholder comprises: a) a toolholder body; b) a bore extending rearwardly therein and having a central axis extending therethrough; c) a forwardly facing surface extending about the bore for abutment with the rearwardly facing face of the insert; d) wherein the bore has a tapered section which narrows inwardly as it extends from the forwardly facing surface and is dimensioned to radially expand and to provide a resilient interference fit with the shank when the forwardly facing surface is in abutment with the rearwardly facing face, and wherein the tapered section of the bore has one of the shapes from the group of shapes consisting of a circle, ellipse, triangle and lobed triangle; e) a toolholder passageway extending beyond the bore and through the toolholder body along the central axis; f) a hold-down bolt engageable within the toolholder passageway, wherein the hold down bolt has a head larger than the insert passageway and a hold down bolt shank smaller than the insert passageway and the bolt head engages the forward end of and retains the cutting insert within the toolholder, and wherein the hold-down bolt is not part of the cutting insert; and g) wherein the tapered section of the bore includes longitudinally extending slots extending rearwardly from the forwardly facing surface of the toolholder adapted to receive matching projections extending from the cutting insert.