The purpose of the present invention is to provide a method for producing a pipe material and to provide a mandrel with which resistance between a member to be processed and the mandrel during bending processing can be reduced and overall processing time can be shortened. The method for producing a pipe material includes: a step for inserting a mandrel, which is provided on the inside thereof with a flow path through which dry ice powder flows and spray holes at the tip thereof for spraying the dry ice powder, inside pipe material; a step for spraying the dry ice powder from the spray holes inside the pipe material; and a step for performing bending processing on the pipe material wherein the mandrel has been inserted.

A heat exchanger tube for transferring a heat of an exhaust gas to a fluid to be heated includes a turn-back portion formed in an intermediate portion of the heat exchanger tube and a reciprocating conduit portion. The reciprocating conduit portion includes a conduit portion leading from a starting end of the heat exchanger tube to the turn-back portion, and a conduit portion leading from the turn-back portion to a terminal end of the heat exchanger tube. A space equal to or greater than the outer diameter of the conduit portions is provided between these conduit portions.

A tool for bending an elongated workpiece includes a shaft having a first shaft portion and a second shaft portion, and a coupling assembly coupling the first shaft portion and the second shaft portion. The coupling assembly has a locked configuration in which the coupling assembly inhibits movement of the first shaft portion relative to the second shaft portion and an unlocked configuration in which the coupling assembly permits movement of the first shaft portion relative to the second shaft portion. The tool also includes a shoe coupled to the second shaft portion. The shoe has a curved bottom portion and a hook configured to hold the workpiece against the curved bottom portion. The curved bottom portion is engageable with the workpiece to bend the workpiece.

A tool for bending an elongated workpiece includes a shaft having a first shaft portion and a second shaft portion, and a coupling assembly coupling the first shaft portion and the second shaft portion. The coupling assembly has a locked configuration in which the coupling assembly inhibits movement of the first shaft portion relative to the second shaft portion and an unlocked configuration in which the coupling assembly permits movement of the first shaft portion relative to the second shaft portion. The tool also includes a shoe coupled to the second shaft portion. The shoe has a curved bottom portion and a hook configured to hold the workpiece against the curved bottom portion. The curved bottom portion is engageable with the workpiece to bend the workpiece.

A machine for bending oblong elements, preferably metal, includes a feed unit configured to feed at least one of the oblong elements along a longitudinal axis. A bending device is located downstream of the feed unit and a curving unit is disposed downstream of the bending device and is configured to curve the oblong element along part of its oblong development.

A machine for bending oblong elements, preferably metal, includes a feed unit configured to feed at least one of the oblong elements along a longitudinal axis. A bending device is located downstream of the feed unit and a curving unit is disposed downstream of the bending device and is configured to curve the oblong element along part of its oblong development.

A tube bending system having a frame, one or more static dies, one or more sliding dies and one or more motors for bending tubes, such as metal tubes, in the form of hoops to create a framework for a greenhouse. The system may include separately leveled frames including a central frame supporting the middle of an arch die, and a pair of lateral frames supporting the lateral sides of the die. An apex clamp on the central frame holds the middle of a straight tube blank against the arch die, while a pair of bending carriages on the lateral frames are displaced to bend the tube blank around the arch die. The apex clamp may move both vertically and longitudinally to cycle between holding the tube blank against the arch die, ejecting the bent tube from the die, and retracting to enable placement of another straight tube.

A manual conduit bender includes an angle setter that can be selectively engaged with a bender head to allow users to precisely set common bend angles.

A manual conduit bender includes an angle setter that can be selectively engaged with a bender head to allow users to precisely set common bend angles.

A bendable tube having pre-marked horizontal and vertical alignment guides which allow a user to form successive bends of the tube in the same plane. The horizontal and vertical alignment guides are coplanar with a horizontal plane and a vertical plane which axially bisect the tube and are perpendicular to each other. The horizontal and vertical alignment guides allow the tube to be precisely aligned within a bending apparatus, ensuring that the horizontal alignment guides remain coplanar with the horizontal plane when performing a horizontal bend, and that the vertical alignment guides remain coplanar with the vertical plane when performing a vertical bend.