A galling-resistive insert is positioned on an outer surface of a mandrel assembly. The insert is secured at the outer surface of the mandrel assembly and functions to reduce galling of an inner surface of a tubular blank during a rotary-draw bending operation.

A pipe bend die unit comprises a clamp member having a first groove part of half-circular cross section on an outer peripheral surface thereof with a fitting recess extending in a peripheral direction by a first predetermined length on a planar surface perpendicular to a rotary axis, and a counter pressure member having a second groove part of half-circular cross section formed on an outer peripheral surface thereof, and a fitting protrusion extending in a peripheral direction by a second predetermined length from a tip end portion of the second groove part. The fitting protrusion is positioned in the fitting recess so that the first and second groove parts are combined to form a pipe-receiving groove of half-circular cross section. The counter pressure member and the clamp member are hingedly connected to one another so as to be rotatable relative to each other about the rotary axis.

A pipe bend die unit comprises a clamp member having a first groove part of half-circular cross section on an outer peripheral surface thereof with a fitting recess extending in a peripheral direction by a first predetermined length on a planar surface perpendicular to a rotary axis, and a counter pressure member having a second groove part of half-circular cross section formed on an outer peripheral surface thereof, and a fitting protrusion extending in a peripheral direction by a second predetermined length from a tip end portion of the second groove part. The fitting protrusion is positioned in the fitting recess so that the first and second groove parts are combined to form a pipe-receiving groove of half-circular cross section. The counter pressure member and the clamp member are hingedly connected to one another so as to be rotatable relative to each other about the rotary axis.

A push-bending forming device for titanium alloy tubes is provided, which includes a die main body, a plurality of filling balls, a differential temperature assembly and a punch. The filling balls are configured to be filled in a tube blank, and are made of a metal material, with a heat-resistance temperature over 500 C. A diameter of the filling ball is less than an inner diameter of the tube blank. The punch includes a first pushing part and a second pushing part. A push-bending forming method using such device is also provided.

A bend die comprises a clamp member having a first groove part of half-circular cross section on its outer peripheral surface with a fitting recess formed on the first groove part and extending in a peripheral direction by a first predetermined length on a planar surface perpendicular to a rotary axis, and a counter pressure member having a second groove part of half-circular cross section formed on its outer peripheral surface, and a fitting protrusion extending in a peripheral direction by a second predetermined length from a tip end portion of the second groove part. The fitting protrusion is positioned in the fitting recess so that a pipe-receiving groove of half-circular cross section is formed. The first and second groove parts are hingedly connected to one another about the rotary axis so as to be rotated relative to each other.

A push-bending forming device for titanium alloy tubes is provided, which includes a die main body, a plurality of filling balls, a differential temperature assembly and a punch. The filling balls are configured to be filled in a tube blank, and are made of a metal material, with a heat-resistance temperature over 500 C. A diameter of the filling ball is less than an inner diameter of the tube blank. The punch includes a first pushing part and a second pushing part. A push-bending forming method using such device is also provided.

A method for manufacturing a split link assembly having a split link (800C) that includes a first half link (801), a second half link (803) and a threaded aperture (805) formed in both the first half link (801) and second half link (803) for use in joining the first half link and second half link with a fastening device (807). The split link assembly is machined to include a head portion (811), shoulder portion (813), barrel portion (815) and base portion (817) for use in providing a highly flexible tube bending mandrel.

A method for manufacturing a split link assembly having a split link (800C) that includes a first half link (801), a second half link (803) and a threaded aperture (805) formed in both the first half link (801) and second half link (803) for use in joining the first half link and second half link with a fastening device (807). The split link assembly is machined to include a head portion (811), shoulder portion (813), barrel portion (815) and base portion (817) for use in providing a highly flexible tube bending mandrel.

The invention relates to a device for the internal bending of pipes (100), in particular of coated pipes, for pipelines with a base body (11) which can be positioned in the pipe and which has on at least one side (12), preferably the underside, at least one support surface (13) with an inner wall (101) of a pipe (100) to be bent, wherein the base body (11) has a support surface (13) opposite, preferably the upper side, on which at least one tool for introducing a bending force into the pipe (100) is movably provided, wherein the tool is movable relative to the base body (11) via at least one actuator (18, 20) for introducing the bending force. The invention provides that the tool is provided as a tool element (21) which has at least two bending force introduction sections (28, 29) for introducing the bending force into the pipe (100), which are each movable relative to the base body (11) by at least one actuator (18, 20).

The invention relates to a device for the internal bending of pipes (100), in particular of coated pipes, for pipelines with a base body (11) which can be positioned in the pipe and which has on at least one side (12), preferably the underside, at least one support surface (13) with an inner wall (101) of a pipe (100) to be bent, wherein the base body (11) has a support surface (13) opposite, preferably the upper side, on which at least one tool for introducing a bending force into the pipe (100) is movably provided, wherein the tool is movable relative to the base body (11) via at least one actuator (18, 20) for introducing the bending force. The invention provides that the tool is provided as a tool element (21) which has at least two bending force introduction sections (28, 29) for introducing the bending force into the pipe (100), which are each movable relative to the base body (11) by at least one actuator (18, 20).