A method of manufacturing an arc corner connecting rib of a metal box shell is disclosed. The method of manufacturing comprises the following steps: preparing a rectangular metal shell whose vertex corner portions are arc corner transition portions; drawing for a first time by means of a first metal drawing mold a top face plate of the rectangular metal shell, so that a plurality of first convex strips are formed in a first area between the two arc corner transition portions of the top face plate; and drawing for a second time by means of a second metal drawing mold a side face plate and the arc corner transition portions of the rectangular metal shell obtained after the first drawing molding, so that a plurality of second convex strips are formed in a second area between the two arc corner transition portions of the side face plate.

After holding a metal pipe 10 using a clamping die 5, a primary formed portion 11a corresponding to the preforming surface portion 5c is formed on the metal pipe 10 by pressing an end portion of the metal pipe 10 with a pressing die 6 in a direction of a cylinder center line C1. A final formed portion 11b is formed on the metal pipe 10 by moving an outer forming die 7 to press an outer circumferential surface of the metal pipe 10 with the outer forming die 7 after aligning a rib portion 7c with the primary formed portion 11a, while moving an inner forming die 8 to press an inner circumferential surface of the metal pipe 10 with the inner forming die 8 after aligning a recessed groove portion 8c with the primary formed portion 11a.

After holding a metal pipe 10 using a clamping die 5, a primary formed portion 11a corresponding to the preforming surface portion 5c is formed on the metal pipe 10 by pressing an end portion of the metal pipe 10 with a pressing die 6 in a direction of a cylinder center line C1. A final formed portion 11b is formed on the metal pipe 10 by moving an outer forming die 7 to press an outer circumferential surface of the metal pipe 10 with the outer forming die 7 after aligning a rib portion 7c with the primary formed portion 11a, while moving an inner forming die 8 to press an inner circumferential surface of the metal pipe 10 with the inner forming die 8 after aligning a recessed groove portion 8c with the primary formed portion 11a.

A device for flow-forming workpieces having a rotatable first, outer forming tool for acting upon an outer contour of a first workpiece in the form of a hollow body. The device also has a first, inner forming tool for acting upon an inner contour of the workpiece. The first workpiece can be set in rotation about a first workpiece axis and can be plastically deformed by a pressure applied by the first, inner forming tool and the first, outer forming tool in a forming zone formed between the first forming tools by the material being made to flow between the first forming tools. The device has a drive for driving the first, outer forming tool.

A method and device for production of a combustion chamber tube for restraint systems in vehicles. The combustion chamber tube is embossed by several embossing dies arranged stellate around the combustion chamber tube and movable by an annular compression module with several punches movable in synchronized fashion in the radial direction and two inner punches extending into the ends of the combustion chamber tube, each with a support mandrel and a shaping mandrel movable relative to support mandrel. The combustion chamber tube is embossed from the outside by the embossing dies radially movable via punches against the support mandrels and the ends of the combustion chamber tube are shaped by shaping mandrels movable relative to support mandrels when the embossing dies are closed.

A method and device for production of a combustion chamber tube for restraint systems in vehicles. The combustion chamber tube is embossed by several embossing dies arranged stellate around the combustion chamber tube and movable by an annular compression module with several punches movable in synchronized fashion in the radial direction and two inner punches extending into the ends of the combustion chamber tube, each with a support mandrel and a shaping mandrel movable relative to support mandrel. The combustion chamber tube is embossed from the outside by the embossing dies radially movable via punches against the support mandrels and the ends of the combustion chamber tube are shaped by shaping mandrels movable relative to support mandrels when the embossing dies are closed.

A pipe component with an outer pipe element and at least one inner pipe element arranged inside the outer pipe element is provided. The outer pipe element is formed as a flexible pipe element with a plurality of projections, in particular corrugations, and/or at least one corrugated portion. On at least one point the outer pipe element and the at least one inner pipe element each have a projection pointing to the outside in a radial direction, wherein the outside of the projection of the at least one inner pipe element at least partly flatly rests against the inside of the projection of the outer pipe element or of another inner pipe element, so that by means of the projections a connection exists between the at least one inner pipe element and the outer pipe element. The invention furthermore relates to a method for manufacturing a pipe component.

A pipe component with an outer pipe element and at least one inner pipe element arranged inside the outer pipe element is provided. The outer pipe element is formed as a flexible pipe element with a plurality of projections, in particular corrugations, and/or at least one corrugated portion. On at least one point the outer pipe element and the at least one inner pipe element each have a projection pointing to the outside in a radial direction, wherein the outside of the projection of the at least one inner pipe element at least partly flatly rests against the inside of the projection of the outer pipe element or of another inner pipe element, so that by means of the projections a connection exists between the at least one inner pipe element and the outer pipe element. The invention furthermore relates to a method for manufacturing a pipe component.

A bending die for pre-bending a workpiece section includes a die section with a slot for partially receiving a bending punch for hemming a workpiece section during hemming, the slot leading from a bearing surface into the interior of the bending die, and a hemming section, arranged laterally with respect thereto, with a hemming surface. The bending punch includes a punch section (12) extending from a punch base surface and a hemming section, arranged laterally thereto, with a hemming surface. In this case, the hemming surface on the bending die is set back in a step-like manner with respect to a bearing surface of the die section, with the result that a stop surface extending from the bearing surface to the hemming surface is formed and the hemming section on the bending punch protrudes with respect to the punch base surface in the direction of the punch tip, with the result that the hemming surface protrudes in a step-like manner with respect to the punch base surface.

A method for manufacturing a pressed component including forming a metal sheet into a pressed component shape having: a cross section having a top sheet portion and a side wall portion continuous to at least one side in the width direction of the top sheet portion via a first bent portion; and having one or two or more curved portions in which the top sheet portion is curved to project or to be recessed in a side view along the longitudinal direction in the direction intersecting the cross section, the method which includes: a first preliminary forming step having a step of forming, to the metal sheet, first beads extending along the longitudinal direction at a position where the first bent portion is formed; and a first component forming step of forming the metal sheet after the first preliminary forming step into the pressed component shape.