A metal pipe including a curved portion produced by bending in which a plurality of non-bending surfaces and a plurality of bent portions at which the non-bending surfaces are connected in a bending manner are provided on a circumferential surface on an inside of a center of a curvature side of the curved portion is provided.

A metal bend pipe having a bend portion bent in a semi-circular arc shape is provided, in which an identification part that enables one of the two end portions of the bend portion to be identified as the bending-start side or the bending-end side is provided, and the identification part is integrally formed as a protruding and/or recessed three-dimensional region. Thus, it is possible to easily and reliably identify which of the two end portions of the bend portion is the bending-start side or the bending-end side.

A metal bend pipe having a bend portion bent in a semi-circular arc shape is provided, in which an identification part that enables one of the two end portions of the bend portion to be identified as the bending-start side or the bending-end side is provided, and the identification part is integrally formed as a protruding and/or recessed three-dimensional region. Thus, it is possible to easily and reliably identify which of the two end portions of the bend portion is the bending-start side or the bending-end side.

A manufacturing method for a pipe structure includes a pipe bending step for implementing for a plurality of times a bending process of bending a part of a straight pipe by wrapping the part around a peripheral surface of a rolling block to form a plurality of bend portions in intermediate locations along a longitudinal direction of the pipe. When a final bending process is implemented during the pipe bending step, a position of a rear end portion of the pipe is determined, and relative positions of the pipe and the rolling block in a predetermined y direction are controlled on the basis of the position of the rear end portion so that after the bending process, a y-direction position of the rear end portion is aligned with a y-direction position of the front end portion. According to this configuration, complicated operations such as cutting the respective end portions of the pipe after bending the pipe can be eliminated, and a pipe structure such as a meandering pipe body in which the positions of the respective end portions are aligned can be manufactured appropriately and with favorable productivity.

A manufacturing method for a pipe structure includes a pipe bending step for implementing for a plurality of times a bending process of bending a part of a straight pipe by wrapping the part around a peripheral surface of a rolling block to form a plurality of bend portions in intermediate locations along a longitudinal direction of the pipe. When a final bending process is implemented during the pipe bending step, a position of a rear end portion of the pipe is determined, and relative positions of the pipe and the rolling block in a predetermined y direction are controlled on the basis of the position of the rear end portion so that after the bending process, a y-direction position of the rear end portion is aligned with a y-direction position of the front end portion. According to this configuration, complicated operations such as cutting the respective end portions of the pipe after bending the pipe can be eliminated, and a pipe structure such as a meandering pipe body in which the positions of the respective end portions are aligned can be manufactured appropriately and with favorable productivity.

An assembly for bending a conduit and a portable conduit bender. The assembly may generally include a portable bender including a base having a base surface supportable on a work surface, a housing supported by the base and defining a housing axis, the housing including a handle engageable by an operator to carry the bender, and a shoe supported by the housing for pivoting movement about the housing axis, the shoe defining a channel for supporting a conduit to be bent; and a pipe threader removably supported by the housing, the threader being operable to pivotably drive the shoe relative to the housing to bend the conduit.

A mine bolt bending system includes a frame comprising a plurality of bolt receiving portions each configured to receive and hold a mine roof bolt, a bolt contact member secured to the frame, with the bolt contact member rotatable relative to the frame between a first position and second position, and an actuator secured to the frame, with the actuator configured to move the bolt contact member between the first and second positions. The bolt contact member is configured to bend a mine bolt when rotating from the first position to the second position.

A mine bolt bending system includes a frame comprising a plurality of bolt receiving portions each configured to receive and hold a mine roof bolt, a bolt contact member secured to the frame, with the bolt contact member rotatable relative to the frame between a first position and second position, and an actuator secured to the frame, with the actuator configured to move the bolt contact member between the first and second positions. The bolt contact member is configured to bend a mine bolt when rotating from the first position to the second position.

A bending machine includes a first track device and a second track device. A first base and a first robot are movable on the first track device. A second base and a second robot are movable on the second track device. A first bending mechanism is arranged at one end of the first robot. A second bending mechanism is arranged at one end of the second robot. A workpiece feeding device is provided at a position that is on one end side in an extending direction of the first track device and the second track device and is reachable by at least one of the first bending mechanism and the second bending mechanism. The workpiece feeding device feeds the workpiece in a manner that a longitudinal direction of the workpiece is orthogonal to the extending direction of the first track device and the second track device.

A bending machine includes a first track device and a second track device. A first base and a first robot are movable on the first track device. A second base and a second robot are movable on the second track device. A first bending mechanism is arranged at one end of the first robot. A second bending mechanism is arranged at one end of the second robot. A workpiece feeding device is provided at a position that is on one end side in an extending direction of the first track device and the second track device and is reachable by at least one of the first bending mechanism and the second bending mechanism. The workpiece feeding device feeds the workpiece in a manner that a longitudinal direction of the workpiece is orthogonal to the extending direction of the first track device and the second track device.