A method of manufacturing a tubular member for an automotive application that includes providing a flat workpiece of a material; forming at least one lance in the flat workpiece; roll-forming the flat workpiece into a tubular configuration; induction welding a seam of the tubular workpiece after the roll-forming; and trimming the tubular workpiece through the lance after welding the seam.

A flat tube for a heat exchanger is fabricated from a single sheet of metal material. The sheet of metal material has a first edge and a second edge, which are arranged adjacent to one another between a pair of broad walls of the tube. Flat sections extend from the edges and are disposed against one another. A pair of rounded walls arranged at an end of the tube connect the flat sections to the broad walls, and are joined by a weld bead within a space bounded by the outer surfaces of the rounded walls.

A press device includes: a first die having a shape of an elliptical cylinder; a second die having a first recess that forms a part of an elliptical-cylindrical space configured to arrange the first die therein; a third die having a second recess to be combined with the first recess to form the elliptical-cylindrical space; a first press mechanism that inserts the first die along a radial direction of the first die to the first recess of the second die over which the flat metal stock is placed so as to press the metal stock; and a second press mechanism that moves the third die relative to the first die inserted to the first recess so as to confine the first die and the metal stock in the elliptical-cylindrical space formed by the first recess and the second recess.

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.

Method for forming tubular segments, wherein a metal strip is or a series of metal strips is pressed into a tubular or truncated conical shape, such that opposite longitudinal ends of the strip or strips meet, forming at least one seam, where after the seam is welded, joining the meeting ends together, wherein at least after welding the cross sectional profile of at least part of the segment is measured, at least at and/or near said welded seam or seams, and data of said measurement is fed into a control unit, where after a press is operated by the control unit based on said data, adjusting the cross sectional profile of the segment, at least at the or each seam.

A front rail configured to be supported by a vehicle frame includes a tubular body formed by a roll-formed high-strength metal and configured to undergo axial loading during a front vehicle impact. The high-strength metal sheet defines a cross-sectional shape along a length of the tubular body. The tubular body includes a central wall extending from a first side wall to a second side wall defining at least a first longitudinal channel and a second longitudinal channel. A groove is disposed in first side wall of the tubular body and extends longitudinally along at least a portion of the length of the tubular body to stiffen the tubular body. A hole extends through the first side wall of the tubular body proximate the groove and is configured as a bend initiator.

The present invention provides a method for manufacturing a torsion beam, the method comprising: a planarization step, in which a protruding portion of an upper mold presses the opposite end portions in the width direction of the blank to be plastically deformed to be flat while the opposite end portions in the width direction of the blank are supported by a side cam to face each other; a welding and bonding step for bonding the planarized opposite end portions in the width direction of the blank via welding; and a quenching step for heating the welded and bonded blank within a range of 900 to 970? C. for a retaining time within a range of 1 to 20 minutes and for cooling down the blank in a treatment liquid including at least one of water and oil in a range of 20 to 90? C.

The invention discloses a foundation pile having at least two interconnected part-cylinder segments which are each produced from a steel plate having a length extent and a width extent, wherein the foundation pile is characterized in that the respective part-cylinder segments are produced by bending the steel plates along their width extent, with the result that end edges extending along the width extent of the part-cylinder segments have a bending, in that a height extent of the respective part-cylinder segments is greater than their width extent, and in that the longitudinal edges of the part-cylinder segments that extend along the height extent of the part-cylinder segments are arranged parallel to one another. The present invention further discloses a method for producing a foundation pile according to the invention.

A method of forming a tubular structure includes mechanically pickling a metal strip. The metal strip includes opposing first and second surfaces. The method also includes stippling indicia onto the first surface of the metal strip. The indicia includes an informational pattern. The method further includes forming the metal strip into a tubular structure such that the first surface forms an interior surface of the tubular structure.

Provided is an electrical dust-collecting filter manufacturing method and an electrical dust-collecting filter. The method includes the steps of: preparing a frame body, a dust-collecting electrode, a discharge electrode, and a discharge frame; assembling the dust-collecting electrode into an assembly hole of the frame body; connecting the discharge frame to the frame body via an insulating member; and arranging the discharge electrode in an axial direction inside the dust-collecting electrode via the discharge frame and fixing the same. The dust-collecting electrode assembling step includes: temporarily elastically deforming the dust-collecting electrode in the radial direction and inserting the same into the assembly hole of the frame body; and pressurizing end parts of both ends of the dust collecting electrode, which protrude out of a plate member when fitted into the assembly hole, in the axial direction such that the end parts are compressed against the surface of the plate member.