This production line automatically opens the coil material through an uncoiler, and the non embroidered steel strip is leveled and leveled by a leveling machine. Then, it is fed into an automatic punching machine and an automatic forming and cutting machine by a servo conveyor for punching and forming. The workpiece is smoothly conveyed by a linkage conveyor. The stamped sheet metal is stored by the robot arm on the corresponding buffer car. When producing the designated model of inner drum, the robot arm moves the corresponding inner drum piece into the production conveyor line and enters the automatic folding and circular buckle machine. The robot arm automatically moves the semi-finished drum into the rolling machine for automatic rolling. After completion, the robot arm moves the workpiece out of the automatic line. The unmanned automatic continuous production of sheet metal from uncoiling and leveling to rolling process has been achieved. Manually pre install the bottom of the barrel, use a barrel closing and edge rolling machine to rivet the inner barrel to the plastic base, and finally transport the completed inner barrel to the final assembly line through the material line to complete production.