| 摘要 |
<p>The invention relates to a mandrel (13) for centering a workpiece (48) in a machine tool (1). The mandrel (13) comprises two parts, namely a centering element (24) and a clamping element (22), which can be locked together. The centering element (24) is fitted in a fixture element (41) supported on the machine tool and incorporates pneumatically controlled centering devices (33, 35). The centering element (24) is fitted in the fixture element (41) in such a way that a positive pressure occurs between the centering element (24) and the fixture (41), resulting in dust and dirt being kept away from the bearing. The diameter (a) of the portion of the centering element (24) which is fitted in the fixture (41) is independent of the diameter of the workpiece (48) which is to be machined. This means that the centering element can be stably fastened in even when workplaces (48) with small-diameter holes are machined.</p> |
