The apparatus for manufacturing a tubular, sheet metal heat-insulating element (1) from a sheet metal blank (9) successively comprises, in a direction of travel perpendicular to the axis of the heat-insulating element to be produced, a drive unit (5) for conveying the blank (9) flat in the direction of travel (F), a set of shaping rolls (61, 62) comprising shaping rollers (65, 66) for forming a relief on the edge of the blank, and a roll-bending unit (7), situated immediately downstream of the set of shaping rolls, for roll-bending the blank comprising said relief. Firstly, reliefs are shaped on the edges of the blank by means of shaping rolls, then roll-bending is performed, preferably immediately thereafter and in the same operation, the edge-forming and roll-bending being carried out in a single pass.

The apparatus for manufacturing a tubular, sheet metal heat-insulating element (1) from a sheet metal blank (9) successively comprises, in a direction of travel perpendicular to the axis of the heat-insulating element to be produced, a drive unit (5) for conveying the blank (9) flat in the direction of travel (F), a set of shaping rolls (61, 62) comprising shaping rollers (65, 66) for forming a relief on the edge of the blank, and a roll-bending unit (7), situated immediately downstream of the set of shaping rolls, for roll-bending the blank comprising said relief. Firstly, reliefs are shaped on the edges of the blank by means of shaping rolls, then roll-bending is performed, preferably immediately thereafter and in the same operation, the edge-forming and roll-bending being carried out in a single pass.

Provided is a method for manufacturing a cylindrical member which includes end bending of respective end portions of a plate material in a longitudinal direction, primary grooving of respective end surfaces of the plate material subjected to end bending, bending of the plate material to a ring shape, secondary grooving of respective end surfaces of the plate material subjected to bending in a ring shape, and joining of respective end surfaces of the plate material. Therefore, it is possible to manufacture a high-quality cylindrical member.

Provided is a method for manufacturing a cylindrical member which includes end bending of respective end portions of a plate material in a longitudinal direction, primary grooving of respective end surfaces of the plate material subjected to end bending, bending of the plate material to a ring shape, secondary grooving of respective end surfaces of the plate material subjected to bending in a ring shape, and joining of respective end surfaces of the plate material. Therefore, it is possible to manufacture a high-quality cylindrical member.

In one embodiment, the method includes providing a double sheet metal element including the two sheet metal end sections; and creating a connecting section along the connecting line. The creation of the connecting section includes introducing a first depression into the double sheet metal element, and creating a first folded section of the double sheet metal element. The method further includes orienting the connecting section relative to an extension plane of the double sheet metal element so that the connecting section extends perpendicularly to the extension plane.

A method and an installation for continuously shaping longitudinally slotted pipes from a flat material minimizes or avoids markings in the material by evenly introducing into the roll stand the rolling forces of at least two rolls acting successively on the flat material and/or by allowing the two successively acting rolls to align freely relative to one another.

A method and an installation for continuously shaping longitudinally slotted pipes from a flat material minimizes or avoids markings in the material by evenly introducing into the roll stand the rolling forces of at least two rolls acting successively on the flat material and/or by allowing the two successively acting rolls to align freely relative to one another.

To a fulcrum roll unit portion in a workpiece, a corresponding initial curvature radius is applied, and to a bending roll unit portion in a workpiece, a corresponding design curvature radius is applied. To an intermediate unit portion in a workpiece, an intermediate curvature radius set so as to continuously change from the initial curvature radius to the design curvature radius is applied. At least one of the fulcrum roll and the bending roll is moved on the basis of an integrated value obtained by integrating the amount of change in bending position in each of the intermediate unit portion and the bending roll unit portion.

A manufacturing method for a bumper beam of a vehicle may include pipe making, producing a circular pipe by pipe molding a steel plate having a predetermined thickness between first and second molding rolls, heating the circular pipe to a set temperature in a heating furnace, pressurizing and molding the circular pipe heated in the heating furnace and having flexibility, while inserting the circular pipe between an upper mold and a lower mold to form a molding beam, and thereafter, rapidly cooling the molding beam to form the molding beam into a high-strength molding beam, and curvature-molding the high-strength molding beam at a predetermined curvature through a curvature molding machine.

A manufacturing method for a bumper beam of a vehicle may include pipe making, producing a circular pipe by pipe molding a steel plate having a predetermined thickness between first and second molding rolls, heating the circular pipe to a set temperature in a heating furnace, pressurizing and molding the circular pipe heated in the heating furnace and having flexibility, while inserting the circular pipe between an upper mold and a lower mold to form a molding beam, and thereafter, rapidly cooling the molding beam to form the molding beam into a high-strength molding beam, and curvature-molding the high-strength molding beam at a predetermined curvature through a curvature molding machine.