A method for manufacturing a complex-curvature tubular product starting from a metal tube extending along a rectilinear longitudinal axis is provided. The method includes carrying out, by a first bending device, a plurality of first bending operations, each first bending operation being carried out on a respective first straight portion of the metal tube, and in a bending plane passing through the longitudinal axis, so that the metal tube leaving the first bending device has a respective plurality of first curved portions, separated by second straight portions, and carrying out on the metal tube leaving the first bending device, by a second bending device, a plurality of second bending operations, each second bending operation being carried out on one of the second straight portions so that the metal tube leaving the second bending device has, between each pair of consecutive first curved portions, a respective second curved portion, and the tubular product thus obtained has first and second curved portions immediately adjacent to each other.

A method for manufacturing a complex-curvature tubular product starting from a metal tube extending along a rectilinear longitudinal axis is provided. The method includes carrying out, by a first bending device, a plurality of first bending operations, each first bending operation being carried out on a respective first straight portion of the metal tube, and in a bending plane passing through the longitudinal axis, so that the metal tube leaving the first bending device has a respective plurality of first curved portions, separated by second straight portions, and carrying out on the metal tube leaving the first bending device, by a second bending device, a plurality of second bending operations, each second bending operation being carried out on one of the second straight portions so that the metal tube leaving the second bending device has, between each pair of consecutive first curved portions, a respective second curved portion, and the tubular product thus obtained has first and second curved portions immediately adjacent to each other.

A bender tool measuring system includes a conduit bender, a bent piece of conduit, and a measurement apparatus coupled to the conduit. The conduit bender includes a bender head comprising a hook and a handle coupled to and extending from the bender head. The measurement apparatus is configured to project an optical projection onto the handle of the conduit bender, and the location of the optical projection on the length of the handle indicates the position of the bent piece of conduit in relation to the bender head.

A workpiece material is fed between rollers to bend the workpiece material while rolling, wherein the workpiece has a first thickness portion and a second thickness portion connected to each other with a setting angle of 90 degrees. The first thickness portion increases from an inner side toward an outer side, and a thickness on an outer peripheral side of the first thickness portion is M, and a thickness of a cross section of the second thickness portion is N. The workpiece material is rolled in such that at a completion of bending, a thickness of a cross section of a first thickness portion is m, an outer radius of the first thickness portion is R, an inner radius of the first thickness portion is r, and a thickness of a cross section of a second thickness portion is n, and M equals to m(R/r), and N equals to n(R/r).

A workpiece material is fed between rollers to bend the workpiece material while rolling, wherein the workpiece has a first thickness portion and a second thickness portion connected to each other with a setting angle of 90 degrees. The first thickness portion increases from an inner side toward an outer side, and a thickness on an outer peripheral side of the first thickness portion is M, and a thickness of a cross section of the second thickness portion is N. The workpiece material is rolled in such that at a completion of bending, a thickness of a cross section of a first thickness portion is m, an outer radius of the first thickness portion is R, an inner radius of the first thickness portion is r, and a thickness of a cross section of a second thickness portion is n, and M equals to m(R/r), and N equals to n(R/r).

A method for manufacturing a complex-curvature tubular product starting from a metal tube extending along a rectilinear longitudinal axis is provided. The method includes carrying out, by a first bending device, a plurality of first bending operations, each first bending operation being carried out on a respective first straight portion of the metal tube, and in a bending plane passing through the longitudinal axis, so that the metal tube leaving the first bending device has a respective plurality of first curved portions, separated by second straight portions, and carrying out on the metal tube leaving the first bending device, by a second bending device, a plurality of second bending operations, each second bending operation being carried out on one of the second straight portions so that the metal tube leaving the second bending device has, between each pair of consecutive first curved portions, a respective second curved portion, and the tubular product thus obtained has first and second curved portions immediately adjacent to each other.

A method for manufacturing a complex-curvature tubular product starting from a metal tube extending along a rectilinear longitudinal axis is provided. The method includes carrying out, by a first bending device, a plurality of first bending operations, each first bending operation being carried out on a respective first straight portion of the metal tube, and in a bending plane passing through the longitudinal axis, so that the metal tube leaving the first bending device has a respective plurality of first curved portions, separated by second straight portions, and carrying out on the metal tube leaving the first bending device, by a second bending device, a plurality of second bending operations, each second bending operation being carried out on one of the second straight portions so that the metal tube leaving the second bending device has, between each pair of consecutive first curved portions, a respective second curved portion, and the tubular product thus obtained has first and second curved portions immediately adjacent to each other.

To a fulcrum roll unit portion in a workpiece, a corresponding initial curvature radius is applied, and to a bending roll unit portion in a workpiece, a corresponding design curvature radius is applied. To an intermediate unit portion in a workpiece, an intermediate curvature radius set so as to continuously change from the initial curvature radius to the design curvature radius is applied. At least one of the fulcrum roll and the bending roll is moved on the basis of an integrated value obtained by integrating the amount of change in bending position in each of the intermediate unit portion and the bending roll unit portion.

To a fulcrum roll unit portion in a workpiece, a corresponding initial curvature radius is applied, and to a bending roll unit portion in a workpiece, a corresponding design curvature radius is applied. To an intermediate unit portion in a workpiece, an intermediate curvature radius set so as to continuously change from the initial curvature radius to the design curvature radius is applied. At least one of the fulcrum roll and the bending roll is moved on the basis of an integrated value obtained by integrating the amount of change in bending position in each of the intermediate unit portion and the bending roll unit portion.

An apparatus for steering a metal pipe during a roll grooving process including a clamp to be secured to a static structure of a grooving press spaced apart from a rotating cylinder of the grooving press, a pair of spaced parallel rods slidably disposed through spaced openings of the clamp, a handle affixed to first ends of the pair of spaced parallel rods distal from the rotating cylinder, and a guiding tool affixed to second ends of the pair of spaced parallel rods proximate to the rotating cylinder carrying spaced rollers adapted to contact an outer surface of a metal pipe during a roll grooving process to apply a force against the metal pipe. A method for applying a force against a metal pipe during a roll grooving process.