A method for manufacturing a ring includes clamping a first region of a metal sheet against a mandrel, and, while the first region of the metal sheet is clamped against the mandrel, bending the metal sheet around the mandrel to join opposite end faces of the metal sheet and form the ring shaped to the mandrel. A system for manufacturing a ring from a metal sheet includes (a) a mandrel having a ring-shaped surface, (b) a clamp facing the ring-shaped surface and configured to clamp a first region of a metal sheet to the mandrel, and (c) a plurality of dies configured to bend the metal sheet around the mandrel, while the clamp clamps the first region to the mandrel, to join opposite end faces of the metal sheet and form a ring shaped to the ring-shaped surface.

A duct making apparatus includes a first station configured to accept a formable sheet material and a second station configured to receive the formable sheet material from the first station. The first station includes a mechanism for forming one of a male lock bend and a female lock seam in a leading edge of the formable sheet material. The second station includes a retractable conveyor. Movement of the sheet material from the first station to the second station defines an axis of travel of the sheet material. The retractable conveyor is selectively movable from a first position in which the retractable conveyor is in close association with the first station, and a second position in which the retractable conveyor is spaced from the first station.

A method for producing a flat tube for a heat exchanger, in particular for a motor vehicle, having a first wall, a second wall opposite to the first wall, having a third wall connecting the first and second wall, having a fourth wall connecting the second and first wall, wherein the first and second wall are longer than the third and fourth wall, having an interior for a medium to flow through, wherein a turbulence insert is arranged in the interior, wherein the method comprises at least the following process steps: providing a plate materialforming the plate material into an intermediate tube in such a way that the plate material is crowned in at least two sections and the sections at least partially form the first and second wall of the flat tube and the intermediate tube forms an opening in the area one of the two third or fourth wallsproviding and inserting a turbulence insert into the interiorclosing the opening by means of a welding method.

A method of manufacturing a quenched member according to the present disclosure includes heating a pressed intermediate article to an Ac3 transformation point of a steel sheet or higher, the intermediate article having been processed so as to have a rectangular cross-section and so as to include a terminal portion at which two terminal edges of the steel sheet are aligned with each other at a same side of the rectangular cross-section, and quenching the heated intermediate article inside a die.

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.

A method of forming a hollow metal member may include stamping a metal blank to form half shell pieces that are configured to be approximately a half of a hollow metal member and stamping a another metal blank to form a half shell piece that is configured to be approximately the other half of the hollow metal member. The half shell pieces may be aligned to place the edges of the first and second half shell pieces in abutting contact. The half shell pieces may be welded together along seams that are defined at the abutting edges of the first and second half shell pieces. The attached half shell pieces may then be compacted to form the hollow metal member with reduced residual deformation from stamping and welding the half shell pieces.

A method for producing a high strength tube part is provided. The method includes the acts of: producing a sheet metal blank, producing a tube part by cold forming the sheet metal blank, and hardening the tube part at least in some sections to a high strength tube part.

Device (1) for calibrating and straightening hollow components, preferably welded pipes (2), the device (1) being substantially composed of a frame (5) having two side stands (6, 7), a lower cross member (8) and an upper cross member (9), a ram (10) being provided, said ram (10) being movable toward the lower cross member (8) and back by means of a pressure-operable cylinder assembly (12) supported on the upper cross member (9), and a calibrating and straightening tool (11a) being provided between the lower cross member (8) and the ram (10), wherein the calibrating and straightening tool (11a) is changeably disposed on the lower cross member (8) and on the ram (10) and can be replaced with a bending tool (11b) for bending the lateral ends (3) of sheets (4) to produce pipes (2).

A forming tool and a method of operating thereof for producing a hollow component by sheet-metal forming is disclosed having an upper tool and a lower tool, a mandrel that is driven into the hollow component to be formed and an auxiliary mandrel that is repositionable relative to the mandrel are positioned on the upper tool. The mandrel and the auxiliary mandrel are coupled to the upper tool by one spring-elastic actuation element in such a manner that the mandrel, when the upper tool is being lowered, is driven into the hollow component to be formed and comes to bear therein. A further lowering of the upper tool causes a compression of the coupling element, and the auxiliary mandrel carrying out a movement relative to the mandrel and being driven further into the hollow component.

A method for producing a steel material for line pipes including heating a steel having a specific composition to a temperature of 1000? C. to 1200? C.; performing hot rolling such that a cumulative rolling reduction ratio in a non-recrystallization temperature range is 60% or more, a cumulative rolling reduction ratio in a temperature range of (a rolling finish temperature +20? C.) or less is 50% or more, and a rolling finish temperature is the Ar.sub.3 transformation point or more and 790? C. or less; subsequently performing accelerated cooling from a temperature of the Ar.sub.3 transformation point or more, at a cooling rate of 10? C./s or more, to a cooling stop temperature of 200? C. to 450? C.; and then performing reheating such that the temperature of a surface of the steel plate is 350? C. to 550? C. and the temperature of the center of the steel plate is less than 550? C.