PURPOSE: To execute more exactly bending without damaging the surface of a barrel plate, and without generating the crack of a corner part by constituting the receiving die of a horizontal receiving member for receiving and supporting a square can use barrel plate and a vertical receiving member which can be attached and detached to and from said member, and constituting a bending die of a barrel plate pressure welding lever for welding by pressure the barrel plate to the main surface of the receiving die, and a barrel plate bending lever.

CONSTITUTION: A square can use barrel plate (a) is received and supported on the horizontal receiving surface 1 of the horizontal receiving member A1 of a receiving die A, the moving frame 20 of a bending die B is made to descend, a part a1 is bent downward by the bending piece 12 of the lower end of a barrel plate (a) bending lever 9, and also the part on the receiving surface 1 is pressed and held by the pressure piece 16 of the lower end of a pressure welding lever 7. Subsequently, the frame 20 is further made to descend, the bending piece 12 is welded by pressure to a down inclined face 2 of the receiving die A, the part a1 is further bent to the inside, and thereafter, and the barrel plate (a) which becomes a free state by the upward movement of the frame 20 is moved to the receiving surface 1 part to which a vertical receiving member A2 is attached. The frame 20 is shifted to the left and a part a3 is bent in the horizontal direction by the bending piece 12, also pressed against on a vertical receiving surface 4 by the pressure piece 16, the frame 20 is further moved to the left, the bending piece 12 is welded by pressure an upward inclined face 5, the part a3 is further bent to the inside, and thereafter, the frame 20 is reset to its original position, and the bending is ended.