Rounding device with an articulated preliminary rounding element at the rounding station and method for rounding sheet metal

摘要

The pre-rounding element (14) comprises a rigid upper element part (20), which is arranged with fixation elements (26) for fixing at a rounding apparatus or is formed by a fixed part of the rounding apparatus, a wedge-shaped lower element part (22) provided for acting on the sheet metal blanks to be rounded in the rounding apparatus, a joint arrangement (21), through which the upper element part is connected with the lower element part, and an actuating element, by which the lower element part is displaceable, so that the sheet metal blanks to be rounded are differently pressurized. The pre-rounding element (14) comprises a rigid upper element part (20), which is arranged with fixation elements (26) for fixing at a rounding apparatus or is formed by a fixed part of the rounding apparatus, a wedge-shaped lower element part (22) provided for acting on the sheet metal blanks to be rounded in the rounding apparatus, a joint arrangement (21), through which the upper element part is connected with the lower element part, and an actuating element, by which the lower element part is displaceable, so that the sheet metal blanks to be rounded are differently pressurized by the lower element part depending on the displacement. The actuating element is arranged for executing a linear movement dependent on an electrical input signal. The joint arrangement has a fixed body joint, and a rotating joint with a joint axis. The upper element part and the lower element part are connected together as one piece by a leaf-spring. Independent claims are included for: (1) an apparatus for rounding single sheet metal blanks passing through the apparatus; (2) a welding device for can bodies; (3) a method of rounding sheet metal blanks in a rounding apparatus; and (4) a method of making can bodies from single sheet metal blanks.