A method for manufacturing a clad steel pipe is provided, wherein the clad steel pipe is manufactured by using a clad steel plate as a raw material. The clad steel plate comprises a base layer (1) and a clad layer (2) roll-bonded with the base layer (1). The method for manufacturing a clad steel pipe comprises the steps of forming, welding, and deburring; both sides of the clad steel plate are bent towards the base layer (1) side of the clad steel plate, then the forming step is carried out, and after the forming step, the opening faces of the resultant pipe blank are all in a form of the clad layer (2). According to the method for manufacturing a clad steel pipe, a clad steel pipe is manufactured by using a clad steel plate as a raw material. Thus, continuance and high efficiency of a high-frequency longitudinal welding pipe unit is fully utilized, subsequent non-continuous processes are not necessary, and the corrosion resistance at the weld of the clad steel pipe is ensured.

The present invention relates to a method of manufacturing a pipe, which method comprises cold-gas dynamic spraying of particles onto a suitable support member thereby producing a pipe, and separating the pipe from the support member.

The present invention relates to a method of manufacturing a pipe, which method comprises cold-gas dynamic spraying of particles onto a suitable support member thereby producing a pipe, and separating the pipe from the support member.

Composite tube assemblies and thin-walled tubing are disclosed. In embodiments, the composite tube assemblies include a functional tube and a sacrificial tube disposed within or around the functional tube. The sacrificial tube may be removed by exposure to a corrosive media, without substantially affecting the functional tube. Methods of forming composite tube assemblies and thin-walled tubing are also described.

Composite tube assemblies and thin-walled tubing are disclosed. In embodiments, the composite tube assemblies include a functional tube and a sacrificial tube disposed within or around the functional tube. The sacrificial tube may be removed by exposure to a corrosive media, without substantially affecting the functional tube. Methods of forming composite tube assemblies and thin-walled tubing are also described.

A die set capable of suppressing breakage or wrinkling of the workpiece during bending and a processing method using the die set. A die set used for bending a plate-like workpiece includes a lower die on which the workpiece is placed, and an upper die having a pressing surface formed to press the workpiece against the lower die. The lower die includes a lower movable part slidable in the same direction as a moving direction of the upper die, a reaction force generating member configured to elastically support the lower movable part from beneath, and receiving members located on both sides of the lower movable part. The pressing surface has an arc-shaped cross-section protruding toward the lower die and extends in a longitudinal direction of the workpiece. The maximum push-in position of the lower end portion of the pressing surface is deeper than a position lowered by a finished inner diameter dimension of the workpiece from an upper surface of the lower die.

There is provided a method of manufacturing a variable wall thickness steel pipe with a hollow tubular raw pipe. The method of manufacturing a variable wall thickness steel pipe includes locking the raw pipe in a die by thrusting a plug into the raw pipe from an one end side, so as to expand an outer shape on the one end side in a state, where the raw pipe is disposed inside the die and movement of the raw pipe in a longitudinal direction is restricted; and performing ironing in which an inner shape of the raw pipe is expanded while the outer shape is maintained so that a thin portion is formed by further thrusting the plug toward the other end side of the raw pipe while the locked state of the raw pipe is maintained, whereas the restriction on the raw pipe is relaxed.

A drawing machine comprising: a first drawing unit that includes a first drawing die, a first upstream capstan that is provided before the first drawing die so as to deliver the metal tube to the first drawing die, and a first downstream capstan that is provided after the first drawing die so as to draw the metal tube from the first drawing die; a second drawing unit that includes a second drawing die that draws the metal tube delivered from the first drawing unit, a second upstream capstan that is provided before the second drawing die so as to deliver the metal tube to the second drawing die, and a second downstream capstan that is provided after the second drawing die so as to draw the metal tube from the second drawing die; and a tension applying section that applies a predetermined tension to the metal tube between the first drawing unit and the second drawing unit.

A drawing machine comprising: a first drawing unit that includes a first drawing die, a first upstream capstan that is provided before the first drawing die so as to deliver the metal tube to the first drawing die, and a first downstream capstan that is provided after the first drawing die so as to draw the metal tube from the first drawing die; a second drawing unit that includes a second drawing die that draws the metal tube delivered from the first drawing unit, a second upstream capstan that is provided before the second drawing die so as to deliver the metal tube to the second drawing die, and a second downstream capstan that is provided after the second drawing die so as to draw the metal tube from the second drawing die; and a tension applying section that applies a predetermined tension to the metal tube between the first drawing unit and the second drawing unit.

The present disclosure describes a method of manufacturing a vehicle body structure component. The method includes extruding a tube to include at least one reinforced region extending along a length of the tube. The tube has a first thickness in the at least one reinforced region and a second thickness in other regions of the tube. The first thickness is greater than the second thickness. The method further includes cutting a blank from the tube such that the blank includes at least a portion of the at least one reinforced region and forming the blank into a desired shape of the component.