A method of production of a shaped article able to suppress occurrence of shaping defects, that is, a method of production of a shaped article including a first step of press-forming a metal plate (1a) into a U-shape to obtain a U-shaped article (1b) having a bottom part (2) straight extending in a longitudinal direction and a second step of press-forming the U-shaped article (1b) to bend it in the longitudinal direction so that the bottom part (2) of the part projects to the inside and obtain a U-cross-section bent article (1c).

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.

A method for producing open-seam pipes from sheet metal panels, in particular thick sheet metal panels. A sheet metal panel, having bending edges on the long sides thereof, is fed to a pipe forming press where the sheet metal panel is formed, lying on a lower tool having of two supporting elements which are horizontally spaced apart from each other, by an upper tool, which can be raised and lowered, by application of a bending force, progressively into an open-seam pipe having bending edges on opposite long sides with a gap for later longitudinal seam welding. In order that the sheet metal panel can be easily, progressively formed or shaped from the start, at least the bending sections immediately adjacent on the bending edges of the sheet metal panel are each formed from the outside to the inside, deviating from a numerically ascending bending step sequence in a pilgering process sequence.

A method for manufacturing a pipe includes: press-forming a plate member into a U shape; and press-forming the plate member formed into the U shape into an O shape. The pipe includes a pipe body and a tapered part tilted radially inward and protruding from one end of the pipe body. Before the plate member is press-formed into the U shape, a boundary between a portion of the plate member corresponding to the pipe body and a portion of the plate member corresponding to the tapered part is pressed from a surface of the plate member corresponding to an inner peripheral surface of the pipe to bend the portion of the plate member corresponding to the tapered part toward the surface of the plate member corresponding to the inner peripheral surface of the pipe.

The disclosure relates to a tubular component for a chassis of a vehicle, wherein the tubular component may include an extruded profile made of an aluminum alloy. The extruded profile may include a rounded extruded profile base and profile walls extending from the rounded extruded profile base and facing one another, wherein the profile walls are curved towards one another to form the tubular component.

Provided is a method of manufacturing a pipe including a large-diameter portion, a small-diameter portion, and a reduced diameter portion connecting the large-diameter portion and the small-diameter portion, the method comprising: forming a metal plate member into a U-shaped member having a U-shaped cross section; and forming the U-shaped member into a shape of the pipe. The U-shaped member includes: a curved portion facing an opening between both edges of the U-shaped cross section; and two facing side walls continued from the curved portion. An opening degree of the two facing side walls in a portion to form the small-diameter portion is larger than an opening degree of the two facing side walls in a portion to form the large-diameter portion.

The present invention seeks to enable a band-shaped metal wire member to be stably accommodated within a die. A die is prepared that includes a bottom die provided with a depression and a top die provided with a projection that can be arranged within the depression so as to close off a space above the depression. An inner surface of the depression includes a central die surface formed at a width-direction center of a base of the depression and a pair of curved guide die surfaces provided continuous with two sides of the central die surface and curved so as to project outward. The central die surface is formed as a flat surface or as a surface that curves more gently than the pair of curved guide die surfaces. A bonding process portion of a band-shaped metal wire member is folded in two and arranged within the depression.

A method includes: bending a sheet about a mandrel such that the sheet is tubular, wherein the sheet includes a first longitudinal end portion and a second longitudinal end portion; engaging the first longitudinal end portion with the second longitudinal end portion; and passing the sheet between a first knurling wheel and a second knurling wheel such that the first knurling wheel applies a first knurling pattern to the sheet over the first longitudinal end portion and the second longitudinal end portion and the second knurling wheel applies a second knurling pattern to the sheet over the first longitudinal end portion and the second longitudinal end portion.

A method for producing open-seam pipes from flat metal products, in particular sheet metal, includes a plurality of individual bending steps using at least one bending tool and at least one externally located lower tool. A plurality of positions of individual bending steps and the insertion depth of the bending tool are calculated in advance. Based thereon the flat metal product is then shaped step-by-step to form the open-seam pipe. After each of the bending steps, a target/actual comparison of the distance between two edges and/or between one of the two edges and the axial center line of the flat metal product is carried out. In case of a deviation, a correction value for the subsequent bending step is determined using a correction algorithm so as then to adapt the insertion depth for the bending tool.

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.