Continuous feeding mechanism for friction stir additive manufacturing

The invention relates to a continuous feeding mechanism for friction stir additive manufacturing. The continuous feeding mechanism comprises an additive unit, an additive spindle coaxially arranged with the additive unit and a feeding mechanism coaxially arranged with the additive spindle, spindles are arranged in the additive unit and the additive spindle, and mandrels are coaxially arranged in the centers of the spindles; a square hole matched with a square bar is coaxially formed in the center of the mandrel. The feeding mechanism comprises a shell, a feeding cylinder installed above the shell, a double-roller feeding device installed in the shell, a feeding driving mechanism used for driving the double-roller feeding device to conduct feeding and a main shaft driving mechanism used for driving a main shaft to rotate, and the feeding driving mechanism further drives the double-roller feeding device and the feeding cylinder to rotate synchronously. Continuous, efficient and reliable machining of stirring fr