Patent ID: 8430609

Claim:
A tool for rotary cutting machining, comprising a tool body and a replaceable cutting head detachably attachable to the tool body, wherein: the tool body at its front end has a coupling portion with two coupling legs projecting in the axial direction of the tool body and arranged on opposite sides of the center axis of the tool body; the cutting head has a coupling portion, which is designed for engagement with the coupling portion of the tool body and which is receivable in a space between the coupling legs of the coupling portion of the tool body; internal gripping surfaces are arranged in the space of the coupling portion of the tool body, which are designed for engagement with corresponding external gripping surfaces of the coupling portion of the cutting head; each coupling leg is provided with a respective stop surface intended to transfer torque from the tool body to the cutting head, each stop surface being designed for abutment against a corresponding stop surface of the coupling portion of the cutting head; the coupling portion of the cutting head is turnable in the space of the coupling portion of the tool body about the center axis of the cutting head to and fro between a free position, in which the stop surfaces of the coupling portion of the cutting head do not abut against the corresponding stop surfaces of the coupling legs and the gripping surfaces of the cutting head are not in holding engagement with the corresponding gripping surfaces of the tool body, and an engagement position, in which the stop surfaces of the coupling portion of the cutting head abut against the corresponding stop surfaces of the coupling legs and the gripping surfaces of the cutting head are in holding engagement with the corresponding gripping surfaces of the tool body; the internal gripping surfaces of the coupling portion of the tool body are cylindrical and extend in parallel with the center axis of the tool body; the external gripping surfaces of the coupling portion of the cutting head are cylindrical, extend in parallel with the center axis of the cutting head and have a radius which is larger than the radius of the internal gripping surfaces, these cylindrical external gripping surfaces of the cutting head and the cylindrical internal gripping surfaces of the tool body being dimensioned so as to, by mutual engagement with each other, prevent the cutting, head from being displaced in axial direction away from the tool body when the coupling portion of the cutting head is in the engagement position in the space of the coupling portion of the tool body; and, in each coupling leg, the stop surface of the coupling leg extends in parallel with the center axis of the tool body, and the stop surfaces of the cutting head extend in parallel with the center axis of the cutting head.