Patent ID: 8066457
Filing Date: 2011-11-29
Classification: B23B,B23D,Y10T

Abstract:
1. 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 ).