Centering turning apparatus

The utility model relates to the mechanical technology field, referring to a turning apparatus, especially a centering turning apparatus. The centering turning apparatus is used for automatically turning random air valve hole positions of a motorcycle aluminium wheel hub to accurately align with processing positions and comprises a solid rotation motor, a turning shaft, elevating cylinders, a centering pressure bar, a pulling bar, a pulling bar connection board, a pressure spring and a bearing. The beneficial effects of the utility model are that the elevating cylinders descend to make the centering pressure bar be inserted into a centre hole of a motorcycle aluminium wheel hub to press a motorcycle wheel to realize centering positioning of the motorcycle wheel; then the motor rotates to drive the pulling bar to rotate around a centering pressure bar; when a motorcycle wheel air valve hole position is rotated to a borehole processing position, the motor stops rotating so as to reach the purpose of workpiece c