Flexible electronically functional fibers are described that allow for the placement of electronic functionality in traditional fabrics. The fibers can be interwoven with natural fibers to produce electrically functional fabrics and devices that can retain their original appearance.

Provided is an apparatus of manufacturing a seamless pipe. The apparatus includes a container receiving a work therein, a stem pressing one end of the work within the container, a die installed in a direction opposite to the stem, and having an extrusion hole comprised of a plurality of ports, a rotation member installed on a front end of the die, having a stirring tip inserted into a joint surface formed by abutting a plurality of metal pieces to each other on one surface, and rotating to perform a friction stir bonding in a state in which the one surface contacts the joint surface, and a correction mold including a metal pipe discharging path receiving a metal pipe manufactured by the friction stir bonding and discharging the metal pipe to an outside.

Extruded cylinder liners and methods of forming the same are disclosed. The extruded engine cylinder liner may include a cylindrical body having a longitudinal axis and defining an inner surface and an outer surface. A plurality of spaced apart features may protrude from the outer surface and may extend in a direction oblique to the longitudinal axis. The method may include extruding a metal material through a die to form a cylindrical body defining an inner surface and an outer surface and a plurality of spaced apart features protruding from the outer surface. The die may be rotated about a longitudinal axis during at least a portion of the extruding step such that the features extend in a direction oblique to the longitudinal axis. The oblique features may allow parent casting material to enter channels therebetween and prevent the liner from moving in the vertical and horizontal directions.

A method for the calibration or end sizing of a hollow profile component produced by extrusion for automobile manufacturing. The hollow profile component is inserted into the cavity of an opened press tool and closing the press tool. Expandable mandrels are introduced into the open profile ends of the hollow profile component. The hollow profile component is calibrated or end-sized by applying force simultaneously on the outside and on the inside. The expandable mandrels are retracted, opening of the press tool, and removing of the hollow profile component.

A hollow structure for installation as cross member or longitudinal member in a motor vehicle includes a hollow member which is made of light metal and has at least one hollow chamber. The hollow member has a wall which is formed with a slot. A flange sized to extend through the slot has a leg configured to rest by a formfit against a side of an inner surface area of the hollow member and at least one area which is coupled to an outer surface area of the hollow member.

A method of titanium wire additive manufacturing is disclosed. The method may comprise mixing a plurality of powdered metals comprising titanium, iron, vanadium, and aluminum to produce a powder blend, sintering the powder blend to form a billet, performing a wire forming operation to produce a worked wire, heat treating the worked wire to produce a heat treaded wire, loading the heat treated wire into a wirefeed additive manufacturing machine, and producing a metallic component from the heat treated wire. The titanium may be a titanium hydride powder.

A method for producing a hollow part (17; 21; 46) made of a metal material, includes preparing a blank (1; 18; 33) of the metal material of the hollow part (17; 21; 46), and at least one sacrificial mandrel (2; 19; 34, 35) made of a material which has a yield stress in the range from −30% to +20% of the yield stress of the material of the blank (1; 18; 33), preferably in the range from −15% to +10%, ideally in the range from −5% to +3%; applying a punch (10) on at least one of the ends of the blank (1; 18; 33) in order to produce the expansion of at least a portion of said blank (1; 18; 33) and to create at least one internal space (12; 20; 36, 37) inside said blank (1; 18; 33); inserting a sacrificial mandrel (2; 19; 34; 35) in said an internal space (12; 20; 37) of the blank (1; 18; 33);crimping the sacrificial mandrel (2; 19; 34, 35) in said blank (1; 18; 33);producing, by co-forging, a simultaneous deformation of said blank (1; 18; 33) and of said sacrificial mandrel (2; 19; 34, 35), with a homothetic ratio K; and performing a machining in order to remove the sacrificial mandrel (2; 19; 34, 35).

A method for producing a hollow part (17; 21; 46) made of a metal material, includes preparing a blank (1; 18; 33) of the metal material of the hollow part (17; 21; 46), and at least one sacrificial mandrel (2; 19; 34, 35) made of a material which has a yield stress in the range from −30% to +20% of the yield stress of the material of the blank (1; 18; 33), preferably in the range from −15% to +10%, ideally in the range from −5% to +3%; applying a punch (10) on at least one of the ends of the blank (1; 18; 33) in order to produce the expansion of at least a portion of said blank (1; 18; 33) and to create at least one internal space (12; 20; 36, 37) inside said blank (1; 18; 33); inserting a sacrificial mandrel (2; 19; 34; 35) in said an internal space (12; 20; 37) of the blank (1; 18; 33);crimping the sacrificial mandrel (2; 19; 34, 35) in said blank (1; 18; 33);producing, by co-forging, a simultaneous deformation of said blank (1; 18; 33) and of said sacrificial mandrel (2; 19; 34, 35), with a homothetic ratio K; and performing a machining in order to remove the sacrificial mandrel (2; 19; 34, 35).

A method for manufacturing a cold-forged extruded aluminum alloy rod includes the steps of: (A) preparing a primary material and a cold extrusion apparatus including a cold extrusion die and a cold extrusion punch corresponding in position to the cold extrusion die; (B) processing the primary material to form a solid preform; (C) subjecting the preform to a homogeneous annealing; (D) testing the hardness of the preform; (E) immersing the preform in a tank containing a lubricant for a predetermined time, (F) applying talcum powder on the preform; and (C) subjecting the preform to cold forging to thereby forming the cold-forged extruded aluminum alloy rod.

A method for manufacturing a cold-forged extruded aluminum alloy rod includes the steps of: (A) preparing a primary material and a cold extrusion apparatus including a cold extrusion die and a cold extrusion punch corresponding in position to the cold extrusion die; (B) processing the primary material to form a solid preform; (C) subjecting the preform to a homogeneous annealing; (D) testing the hardness of the preform; (E) immersing the preform in a tank containing a lubricant for a predetermined time, (F) applying talcum powder on the preform; and (C) subjecting the preform to cold forging to thereby forming the cold-forged extruded aluminum alloy rod.