Back to results
US 8,066,457 B2Granted
Machine tool
AssigneeKomet Group GmbH
InventorsOtto Buettiker, Roman Eigenmann, Jacek Kruszynski
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeKomet Group GmbH
InventorsOtto Buettiker, Roman Eigenmann, Jacek Kruszynski
Estimating the term…
The invention relates to a machine tool, particularly a machine reamer, comprising a shaft-type base and a replaceable cutter head which frontally protrudes from the base. An axially protruding extension of said cutter head engages into a frontal receptacle that is fixed to the base, the cutter head being removably clamped in said receptacle by means of a clamping screw which penetrates the replaceable cutter head in a truly axial direction. The screw head of the clamping screw rests against a face of the replaceable cutter head. The extension of the replaceable cutter head is provided with a polygonal part which is complementary to a truly axial polygonal hole that is fixed to the base and is penetrated by the polygonal part. The extension is further provided with an externally conical part which adjoins the polygonal part, engages into a conical hole that is fixed to the base, and is complementary to said conical hole while the clamping screw is screwed into a central internal thread that is fixed to the base. Preferably, the base is equipped with a functional insert which is rigidly connected to the base and contains the internal thread, the polygonal hole, and/or the conical hole.
A machine tool having a shank-like basic body (10) and an interchangeable cutting head (12) which projects beyond the basic body at the front end, engages by means of an axially projecting extension (24) in a front-end receptacle (14) fixed in relation to the basic body and is releasably clamped in place there by means of a clamping screw (34) passing axially centrally through the interchangeable cutting head (12), the clamping screw (34) having a screw head (58) which bears against an end face (60) of the interchangeable cutting head (12) and being screwed into a central internal thread (38) fixed in relation to the basic body, and the extension (24) of the interchangeable cutting head (12) having a polygonal portion (26) passing through an axially central polygonal opening (25), fixed in relation to the basic body, and complementary to said polygonal opening (25), characterized in that the basic body (10) has a functional insert (40) containing the internal thread (38) and the polygonal opening (25) and/or the tapered opening (27), in that the basic body (10) has an axially central coolant bore (66), in that the functional insert (40), in the region of the mating or threaded pin (48), defines coolant passages (68) which are arranged outside the internal thread (38) and communicate with the coolant bore (66) on the basic body side, in that coolant passages (70) defined by the interchangeable cutting head (12) and/or the clamping screw (34) are arranged in the region of that part of the interchangeable cutting head (12) which engages in the functional insert (40), said coolant passages (70) communicating with the coolant passages (68) on the mating or threaded pin side, and in that the coolant passages (70) on the interchangeable cutting head side, in the region of the screw head (58), open into outlet openings (72) pointing toward the cutting edges (16) of the interchangeable cutting head (12).
A machine tool having a shank-like basic body (10) and an interchangeable cutting head (12) which projects beyond the basic body at the front end, engages by means of an axially projecting extension (24) in a front-end receptacle (14) fixed in relation to the basic body and is releasably clamped in place there by means of a clamping screw (34) passing axially centrally through the interchangeable cutting head (12), the clamping screw (34) having a screw head (58) which bears against an end face (60) of the interchangeable cutting head (12) and being screwed into a central internal thread (38) fixed in relation to the basic body, and the extension (24) of the interchangeable cutting head (12) having a polygonal portion (26) passing through an axially central polygonal opening (25), fixed in relation to the basic body, and complementary to said polygonal opening (25), characterized in that the basic body (10) has a functional insert (40) containing the internal thread (38) and the polygonal opening (25) and/or the tapered opening (27), in that the basic body (10) has an axially central coolant bore (66), and in that the clamping screw (34) has a central passage (84) which communicates with the coolant bore (66) or with a coolant tube (80) arranged in the coolant bore and opens in the region of the screw head into at least one outlet opening (72, 86).
Dependencies are inferred from the claim text.