Patent ID: 6536996
Filing Date: 2003-03-25
Classification: B23C,Y10T

Abstract:
A cutting tool (20, 82) comprising a tool body (22, 22â€²) and two cutting inserts (24, 24a, 24b) mounted therein;the tool body having two insert receiving pockets (26, 26a, 26b) substantially symmetrically located with respect to a center line of the tool body, each of the two insert receiving pockets comprising: a pocket base wall (30), an indentation (32) opening to the base wall, the indentation having a lower wall (34) that is connected to at least three side walls, a first side wall (36) of said at least three side walls being substantially longitudinally directed with respect to the center line, a second side wall (38) of said at least three side walls being parallel to the first side wall and located more distantly relative to the first side wall with respect to the center line of the tool body, a third side wall (40) of said at least three side walls being transversely directed with respect to the first and second side walls, a threaded bore (54) extending through the lower wall (34) of the indentation (32); each of the two cutting inserts (24, 24a, 24b) comprising: a rake surface (62), an insert base wall (68) and a peripheral relief surface (63) connecting the rake surface and the base wall, and cutting edges (59, 60) defined between the rake and relief surfaces, a protuberance (69) extending downwardly from the insert base wall (68) and away from the rake surface (62), the protuberance having a lower wall (70) that is connected to four lateral walls, each lateral wall being connected to an adjacent lateral wall, the four lateral walls being connected to the insert base wall, a first lateral wall (72) of the four lateral walls being substantially longitudinally directed with respect to the center line, a second lateral wall (73) of said four lateral walls being parallel to the first lateral wall, a third lateral wall (74) of the four lateral walls being transversely directed with respect to the first and second lateral walls, a fourth lateral wall (75) of the four lateral walls being parallel to the third lateral wall, a through bore (58), having an axis (B), extending between the rake surface (62) and the lower wall (70); each cutting insert is retained in a respective insert receiving pocket by a clamping screw (78) passing through the through bore (58) of the cutting insert and threadingly engaging the threaded bore (54), the insert base wall (68) abuts the pocket base wall (30) of the insert receiving pocket, the first lateral wall (72) of the protuberance abuts the first side wall (36) of the indentation (32), and the third lateral wall (74) of the protuberance (69) abuts the third side wall (40) of the indentation, in a cross section taken perpendicular to the center line and passing through the threaded bores, the first lateral wall of the protuberance is distanced from the center line by a first distance D1 and the cutting edges are distanced from the center line by a second distance D2 and a third distance D3, where the third distance D3 is greater than the second distance D2, where the first distance D1 is at least three times greater than the second distance D2, and where the relief surface (63) is relieved from the insert receiving pocket (26, 26a, 26b).