| 摘要 |
This invention relates to a mandrel (13) for centering and clamping at least one workpiece (48, 49) in a machine tool (1). The mandrel (13) incorporates movable pressure pistons (32, 33) which are actuated by compressed air to move in the axial direction. The pressure pistons (32, 33) are fitted with a group of centering pins (34, 35), which are actuated by respective inclined planes (36) arranged on the pistons (32, 33). When the respective pistons (32, 33) are displaced, the centering pins (34, 35) within the respective groups are displaced the same distance outwards due to the identical design of the inclined planes (36), which causes the respective workpieces (48, 49) to be centered in relation to the axial centreline of the mandrel (13). Both pistons (32, 33) are controlled by the same pressure source (2), and will therefore always centre both workpieces (48, 49) independently of each other, and with the same total centering force. |
