| 摘要 |
A tool changeover holder for machine tools has a rotationally driven spindle and a replaceable tool head that can be fixed thereto. The rotationally driven spindle has on the tool side a central journal, a chucking devoce and an annular face that surrounds this concentrically. The tool head has a central drilling to accommodate the spindle journal and an annular matching surface that surrounds the drilling concentrically. The spindle face and the matching surfaces have inversely congruent centering and torque-transmitting means that engage in each other in the chucked position. Hirth serration elements are arranged on the face of the spindle in a plurality of annular-sector shaped serration sections that lie on an annulus that is concentric with the axis of the spindle. These are separated from each other by the flat contact surface sections.
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