KR20150021178A - Apparatus and method of bending long work piece, method of manufacturing transfer duct using the same - Google Patents

Abstract

Disclosed is a method for manufacturing a cylinder type transfer duct connected with multiple pipes for flow of a cooling material to have a curved part. The method for a transfer duct includes: a step of forming a unit pipe assembly by connecting a pair of pipes in a longitudinal direction through a pin; a step of moving the unit pipe assembly between a movable bending tool and a counter tool; a step of pressuring a slender member at a predetermined curvature with the movable bending tool at a predetermined position and bending the slender member being in contact with slope surfaces of the movable tool and the counter tool in a sliding manner to have a predetermined torsion angle; and a step of forming a cylinder type duct with a curved part by connecting the unit pipe assemblies bent in the bending step.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bending apparatus and method for bending a thin member, and a method for manufacturing a transfer duct using the bending apparatus and method.

The present invention relates to an apparatus and a method for bending a thin-walled member bending a member having a longer length than a transverse section (hereinafter referred to as a "thin member") to have a twisted shape and a shape having a certain radius of curvature at the same time. ≪ / RTI >

In general, an integrated gasification combined cycle (IGCC) power plant can generate energy relatively cleanly or efficiently from hydrocarbon feedstocks such as coal.

IGCC technology can convert a hydrocarbon feedstock into oxygen, a syngas, by reacting with oxygen in a gasifier.

The gasifier includes an outer pressure vessel and an approximately cylindrical inner transfer duct provided inside the outer pressure vessel to surround the gasification reaction zone.

The transfer duct protects the external pressure vessel from the high temperature reaction temperature and is made of a series of tubes, such as the water cooling wall of the boiler furnace.

Coal and oxygen are injected into the gasification zone of the gasifier to form a syngas composed mainly of hydrogen and carbon monoxide.

The mineral matter in the coal forms molten slag flowing along the inside of the hot surface of the transfer duct to the water receiving portion at the bottom of the gasifier.

The syngas cooled in the gasifier enters the syngas cooler and is cooled to a low temperature to generate high-pressure steam and medium-pressure steam.

The syngas cooler includes an outer container having a long length to allow the synthesis gas to pass therethrough, and a transfer duct for circulating the coolant, for example, inside the outer container may be employed.

As described above, the transfer duct employed in the gasifier or the syngas cooler has a substantially cylindrical shape in which a plurality of pipes are arranged in parallel to each other, and the transfer duct may have a cylinder shape having a curved portion.

In the manufacturing process of the transfer duct having the cylindrical shape having the curved portion, the unit pipe assembly formed by connecting a pair of pipes through the fin is first bent to have a predetermined radius of curvature, And the tilted bending article having a predetermined radius of curvature is formed.

Next, the bending unit pipe assemblies are respectively bonded along the longitudinal direction to form curved cylindrical transfer ducts.

In the conventional transfer duct, in order to form a bending product as described above, the unit pipe assembly is first bent to have a certain radius of curvature, and the unit pipe assembly which is primarily bent is firstly pressed to form a tilted shape Bend to.

That is, in the first bending, a pair of pipes constituting an assembly of unit pipes are held in a horizontal state and bent to have a predetermined radius of curvature by using a bending die having a pin-shaped groove, Bend the bent bend so that it has a certain radius of curvature, using a bending tool of the shape.

As described above, the conventional transfer duct has a problem that the number of processes increases as the bending process of the unit pipe assembly takes the secondary process.

In addition, the dimensions of the final product may be changed by bending the second-order tilting shape while holding the shape of the first-bend pipe, and a physical force (for example, by a hydraulic jack) There is a problem that must be corrected.

KR 2010-0029396 (public date March 17, 2010)

The object of the present invention is to provide an apparatus and method for bending a thin member by bending a thin elongated member having a long length compared to a cross section with a predetermined radius of curvature and bending the member at a predetermined angle by a single process will be.

Another object of the present invention is to provide a manufacturing method of a transfer duct in which the structure of the bending die is improved so that the bending operation of the pipe unit assembly with a predetermined radius of curvature and bending in a tilted state at the same time is performed.

According to one aspect of the present invention, in a bending apparatus for bending a member (elongated member) having a longer length than a cross sectional area, the elongated member is moved to a predetermined position while the elongated member is moved to press the elongated member to have a predetermined curvature A movable bending tool and a counter tool fixedly disposed on the opposite side of the movable bending tool to support the elongated member, the movable bending tool having a length of the elongated member to process the elongated member at a predetermined twist angle, The counter tool including a counter tool having a counter sloped surface corresponding to the bending sloped surface, wherein the counter tool includes a counter sloping surface that slidably contacts the direction side surface.

The movable bending tool may include at least one bending roller supported by a movable movable shaft through a driving device.

The counter tool may include at least one die roller rotatably supported by a fixed shaft fixed to a fixed position facing the bending roller.

The bending inclined surface may be formed to be inclined downward or upward at an angle with respect to the movable shaft along the outer circumference of the bending roller, and the counter inclined surface may be inclined to correspond to the movable inclined surface along the outer periphery of the die roller.

A groove corresponding to an outer contour of the elongated member may be formed on the bending inclined surface and the counter inclined surface.

Wherein the movable bending tool includes two bending rollers disposed at regular intervals and the counter tool includes one die roller facing the two bending rollers and disposed between the two bending rollers, The roller may be configured to move linearly so that the distance between the center of the bending roller and the center of the bending roller becomes narrow.

Wherein the movable bending tool includes one bending roller in which the movable shaft is rotatably disposed at a predetermined angle, and the counter tool includes a die roller fixedly disposed on the opposite side of the bending roller, And a contact roller which is fixedly arranged to support the elongated member.

A plurality of movable bending tools having different bending inclined planes and counter inclined planes and the counter tool are provided and can be changed according to the twist angle required by the elongated member.

The elongate member may include a pipe or a bar, and the elongate member may include a pair of pipes connected to each other in the longitudinal direction via a fin.

According to another aspect of the present invention, there is provided a bending method for bending a member (elongate member) having a length longer than a cross sectional area, wherein the elongate member is movable between a movable bending tool and a counter tool And the bending member is bent to have a predetermined twist angle by contacting the surface of the elongated member to an inclined surface provided to the movable tool and the counter tool.

The movable bending tool includes at least one bending roller rotatably supported on the movable shaft movable to the predetermined position and having an outer periphery inclined at an angle of twist of the elongated member with respect to the movable axis, And at least one die roller which is rotatably supported by a fixed shaft fixedly disposed at a predetermined position and whose outer circumference is inclined relative to the outer circumferential surface of the bending roller with respect to the fixed shaft.

The outer peripheral surface of the bending roller may be formed to be inclined upward or downward with respect to the fixed shaft, and the die roller may be formed to be inclined so as to correspond to the outer peripheral surface of the bending roller.

And a groove corresponding to an outer contour of the elongated member may be formed on an outer circumferential surface of the bending roller and the die roller.

The elongate member may comprise a pipe, a bar, or a pair of pipes connected via a fin.

The movable bending roller and the die roller may be provided with various inclination angles of the outer circumferential surface in accordance with the twist angle of the elongated member so that the bending roller and the die roller may be alternatively employed in accordance with a required twist angle of the elongate member .

According to a further aspect of the present invention there is provided a method of assembling a unit pipe assembly comprising the steps of forming a unit pipe assembly by connecting a pair of pipes longitudinally through a fin, The bending tool is moved to a predetermined position to press the elongated member with a predetermined curvature and the surface of the elongated member is brought into contact with the inclined surface provided to the movable tool and the counter tool so that the elongated member has a predetermined twist angle And bending the unit pipe assemblies bent in the bending step to form a cylindrical duct having a curved portion.

Wherein the movable bending tool includes at least one bending roller rotatably supported on a movable shaft movable to the predetermined position and having an outer circumference inclined upward or downward, and the counter tool is fixedly disposed at the predetermined position And at least one die roller which is rotatably supported by a fixed shaft and whose outer periphery is inclined so as to correspond to the outer peripheral surface of the bending roller with respect to the fixed shaft, It can bend at a constant curvature and a constant twist angle.

The outer peripheral surface of the bending roller may be formed to be inclined upward or downward with respect to the movable shaft, and the die roller may be formed to be inclined so as to correspond to the outer peripheral surface of the bending roller.

A groove corresponding to the outer contour of the elongated member may be formed on an outer circumferential surface of the bending roller and the die roller.

The movable bending tool and the counter tool are variously provided so as to have a bending inclined surface and a counter inclined surface different in inclination angle according to the twist angle of the elongated member and the bending roller and the die roller according to the twist angle of the elongated member Change can be employed.

The pipe may be joined by automatic welding to form the unit pipe assembly.

The automatic welding may be a plasma welding method.

A high-temperature fluid can pass through the cylindrical duct.

A coolant for cooling the high-temperature fluid may flow into the pipe.

According to an embodiment of the present invention, the number of bending operations can be simplified by performing the process of bending the elongated member to have a desired radius of curvature and the process of processing the tilted state at a predetermined angle simultaneously through one tool, The reliability of the dimension can be improved.

1 is a view showing a configuration of a gasification apparatus of an IGCC power plant according to an embodiment of the present invention.
2 is a perspective view of the transfer duct applied to the II display portion of FIG.
3A is a perspective view showing a configuration of a elongated member (unit pipe assembly) according to an embodiment of the present invention.
FIG. 3B is a perspective view showing a state where the elongated member (unit pipe assembly) according to the embodiment of the present invention is bent.
4 is a perspective view showing a bending apparatus of a slender member (unit pipe assembly) according to an embodiment of the present invention.
5A is a plan view showing a configuration of a slender member bending apparatus according to an embodiment of the present invention.
FIG. 5B is a view showing an operation state of a slender member bending apparatus according to an embodiment of the present invention.
6 is a cross-sectional view along line VI-VI of FIG. 5B.
7 is a flowchart illustrating a method of manufacturing a transfer duct according to an embodiment of the present invention.
8 is a plan view showing a configuration of a slender member bending apparatus according to another embodiment of the present invention.

In the following description, the elongated member means all the members made long along the axial direction orthogonal to the cross section, and refers to all members such as pipes, rods, and bars. In the following description, for the sake of convenience, reference will be made to the bending of a unit pipe assembly in which a pipe, for example two pipes, are connected longitudinally and whose cross section has a roughly rectangular shape including long and short sides.

Also, in the following description, the expression 'rectangle' is defined as a cross-sectional shape in which long side long sides face roughly and short side short side faces roughly, and long side and short side always have a straight shape But it does not mean that the entire contour is inclusive of all forms having relatively short short sides with respect to long side and long side which are long.

 1 is a view showing a configuration of a gasification apparatus of an IGCC power plant according to an embodiment of the present invention.

1, a gasification apparatus 1 using a coal gasification combined cycle (IGCC) technology comprises a gasifier 3 for converting a hydrocarbon feedstock into, for example, oxygen and converting it into a gas mixture, that is, a synthesis gas, And a cooler (5) for cooling high-temperature syngas discharged from the firebox (3) to generate high-pressure steam and medium-pressure steam.

The gasifier (3) and the cooler (5) are connected through the transfer duct (10). The transfer duct 10 may include a curved portion 11 having a predetermined curvature and formed of a cylindrical duct by connecting a plurality of pipes in a substantially circular shape along the longitudinal direction.

2 is a perspective view of the transfer duct applied to the II display portion of FIG.

Referring to FIG. 2, the transfer duct 10 is formed in a cylinder shape by connecting a plurality of pipes 12 through which a coolant flows, in the longitudinal direction. The transfer duct (10) has a curved portion (11) curved at a certain radius of curvature.

As the transfer duct 10 is curved, the pipe 12 of the transfer duct 10 has a certain curvature. Further, it is required to have different torsional angles in the portion along the circumferential direction of the transfer duct 10, for example, in the portion A portion B.

FIG. 3A is a perspective view illustrating a configuration of a unit pipe assembly according to an embodiment of the present invention, and FIG. 3B is a perspective view illustrating a unit pipe assembly folded according to an embodiment of the present invention.

3A, the pipe is provided with a pin 13 along the longitudinal direction of the pipe 12 in order to simplify the work flow of the transfer duct, and the two pipes 12 are connected to each other via the pin 13 May be provided to the unit pipe assembly 15.

The two pipes 12 can be connected through automatic welding such as a plasma welder between the fins 13 adjacent to each other.

The assembled unit pipe assembly 15 has a substantially rectangular shape including two long sides S1 facing each other and two short sides S2 facing each other.

Referring to FIG. 3B, the unit pipe assembly 15 is bent so as to have a predetermined curvature corresponding to the curvature of the curved portion 11 of the transfer duct 10, and is provided so as to have a predetermined twist angle.

The twist angle of the unit pipe assembly 15 is differently processed according to the circumferential portion of the transfer duct to be applied.

FIG. 4 is a perspective view showing a bending device of a elongated member (unit pipe assembly) 15 according to an embodiment of the present invention.

Hereinafter, a direction in which the unit pipe assembly 15 is conveyed is referred to as an X-axis, a direction orthogonal to the Y-axis is referred to as a Z-axis, and a direction orthogonal to an X-Y plane is referred to as a Z-axis.

4, the bending apparatus 100 slides the unit pipe assembly 15 longitudinally between the movable bending tool 110, the counter tool 130, the movable bending tool 110 and the counter tool 130, A plurality of sliders 150 for moving the movable bending tool 110, and a driving device 160 for moving the movable bending tool 110.

The movable bending tool 110 moves from a non-machining position where the unit pipe assembly 15 is not bent to a machining position where the unit pipe assembly 15 is machined into a desired bending shape while the unit pipe assembly 15 is moved forward .

The movable bending tool 110 may include at least one bending roller 111, 112 having a movable axis 111a, 112a that is movable in the XY plane through a drive device 160 that is parallel to the Z axis. have. The movable shafts 111a and 112a support the bending rollers 111 and 112 in a rotatable manner so that the unit pipe assembly 15 contacts the circumferential surfaces of the bending rollers 111 and 112 and supports the unit pipe assembly 15 so as to be transportable along the longitudinal direction thereof.

The counter tool 130 may include at least one die roller 131 facing the bending rollers 111 and 112 and rotatably supported by a fixed shaft 131a parallel to the Z axis.

The unit pipe assembly 15 can be bent at a curvature radius corresponding to the curved portion 11 of the transfer duct 10 through the bending rollers 111 and 112 and the die rollers 131 structured as described above.

Grooves 111b and 112b having approximately two concave portions corresponding to the outer contour of the unit pipe assembly 15 (the shape of the long side S1 side of FIG. 3A) are formed on the circumferential surfaces of the bending rollers 111 and 112 and the die roller 131, Can be formed.

The circumferential surfaces of the bending rollers 111 and 112 are inclined so as to have a certain angle with respect to the movable shafts 111a and 112a and the circumferential surfaces of the die rollers 131 are formed obliquely to correspond to the circumferential surfaces of the bending rollers 111 and 112 .

Through the above-described structure, the unit pipe assembly 15 is bent at a predetermined curvature and bent at a predetermined angle.

The inclination angle a of the circumferential surfaces of the bending rollers 111 and 112 and the die roller 131 is variously manufactured corresponding to the twist angle required according to the circumferential portion of the transfer duct 10, Can be employed.

The present invention provides an improved bending process that can reduce the number of workpieces and ensure accurate dimensions of the bending products by performing the unit pipe assembly 15 requiring two types of bending with constant curvature and twist through one process do.

FIG. 5A is a plan view illustrating a configuration of a slender member bending apparatus according to an embodiment of the present invention, and FIG. 5B is a view illustrating an operation state of a slender member bending apparatus according to an embodiment of the present invention.

Referring to FIG. 5A, a unit pipe assembly 15, which is a slender member, is pushed forward through a propelling device (not shown) and is pushed between the bending rollers 111, 112 and the die rollers 131. Here, the bending rollers 111 and 112 are disposed at the non-processing positions, and the center of the bending rollers 111 and 112 and the center of the die roller 131 form a predetermined distance D1 along the Y axis direction.

In this state, the unit pipe assembly 15 is slid forward while contacting along the circumferential surfaces of the bending rollers 111, 112 and the die rollers 131, and the unit pipe assembly 15 is not deformed.

Referring to FIG. 5B, when the unit pipe assembly 15 is advanced forward by a predetermined distance, the driving unit 160 is driven, and the bending rollers 111 and 112 are linearly moved along the arrow A in the XY plane.

As a result, the distance between the centers of the bending rollers 111 and 112 and the die roller 131 has a distance D2. The distance D2 is shorter than the distance D1, and the unit pipe assemblies 111 and 112 are bent at a certain curvature.

6 is a cross-sectional view taken along the line VI-VI of FIG. 5B.

6, in order to push and convey the long-side shaft L of the unit pipe assembly 15 at a predetermined angle (alpha DEG) with respect to the Z-axis orthogonal to the XY plane, The circumferential surface of the die roller 131 is formed to be inclined corresponding to the circumferential surface of the bending roller 111, and grooves 112b and 131b are formed on the inclined circumferential surface.

The outer contour of the unit pipe assembly 15 in which the pair of pipes are arranged side by side on the long side of the unit pipe assembly 15 contacts the grooves 111a and 131a and is transportably supported in a tilted state.

When the bending rollers 111 and 112 are moved in a direction (arrow A direction) approaching the die roller 131 in the XY plane in the inclined state, the unit pipe assembly 15 has a predetermined twist angle and a predetermined curvature, .

As a result, the unit pipe assembly 15 is bent at a predetermined curvature and tilted at the same time.

6, the circumferential surface of the bending roller 112 is formed to be upwardly inclined to have a substantially trapezoidal shape, and the die roller 113 has an inverted trapezoidal shape corresponding to the bending roller 112.

The shape of the bending roller 112 and the die roller 113 may be reversed and the inclination angle of the circumferential surface may be variously formed. The bending roller 112 and the die roller 113 may be changed and employed in accordance with the unit pipe assembly 15 to which the twist angle is differently applied along the circumferential direction of the transfer duct 10 through such a configuration.

7 is a flowchart illustrating a method of manufacturing a transfer duct according to an embodiment of the present invention.

Referring to FIG. 7, a duct manufacturing method includes a unit pipe assembly forming step S10, a unit pipe assembly pushing step S30, a unit pipe assembly bending step S50, and a unit pipe assembly, (S70).

3A and 7, the unit pipe assembly forming step S10 includes preparing two pipes 12 provided with pins 13 along the longitudinal direction, arranging the pipes 12 in parallel along the longitudinal direction, And then connecting the pins 13 by automatic welding, for example, a plasma welding method.

Referring to FIGS. 4 and 7, the unit pipe assembly propulsion step S30 includes a step of moving the unit pipe assembly 15 through the propulsion device (not shown) between the movable bending tool 110 and the movable bending tool 110 And pushing it between the stationary counter-tools 130. Here, the unit pipe assembly 15 slides in contact with the slider 150 and moves forward along its longitudinal direction.

5A, 5B and 7, the unit pipe assembly bending step S50 is performed such that the bending rollers 111 and 112, which are the movable bending tools 110 while the unit pipe assembly 15 is moved forward, The movable bending tool is moved (in the state of FIG. 5B) from the position where the pipe assembly 15 is not bent (the state of FIG. 5A) to the processing position where the unit pipe assembly is processed into a desired bending form, Is bent at a desired radius of curvature.

That is, the support shafts 111 and 112 of the bending rollers 111 and 112 are moved in the direction of arrow A on the XY plane formed by the longitudinal axis X of the unit pipe assembly 15 and the Y axis orthogonal to the longitudinal axis X do. At this time, as the die rollers 131 constituting the counter tool 130 are fixed at a predetermined position, the unit pipe assembly 15 is slid on the circumferential surfaces of the bending rollers 111, 112 and the die rollers 131, Bend.

6, the circumferential surfaces of the bending rollers 111 and 112 constituting the movable bending tool 110 and the circumferential surface of the die roller 131 constituting the counter tool 130 are formed to be inclined, Grooves 111b, 112b and 131b corresponding to the shape of the long side surface of the pipe assembly 15 are respectively formed. As a result, the unit pipe assembly 15 is moved in the forward direction while being inclined at a predetermined angle alpha DEG with respect to the Z axis orthogonal to the XY plane of the unit pipe assembly 15 so that the bending rollers 111 and 112 In the Y-axis direction.

Therefore, the unit pipe assembly 15 is bent to have a predetermined curvature and is bent at a predetermined angle with respect to the Z-axis orthogonal to the X-Y plane defined by the X-axis and the Y-axis orthogonal to the X- Are bent at the same time.

As described above, the unit pipe assembly 15 is bent at a predetermined curvature and is simultaneously processed in a tilted state, so that the number of processes can be shortened and the dimension of the unit pipe assembly 15 can be accurately secured.

2 and 7, in the duct forming step S70, the unit pipe assemblies 15 bent in a state in which the long-side axis L of the transverse section is bent with a predetermined curvature are connected along the longitudinal direction And forming a cylindrical duct (10) having a curved portion (11).

The cylindrical ducts 10 are completed by arranging the unit pipe assemblies 15 in a circular shape as shown in FIG. 2 and arranging the unit pipe assemblies 15 adjacent to each other in the longitudinal direction of the unit pipe assembly 15. Therefore, it is preferable that the inclination angle of the unit pipe assembly 15 is changed according to the position of the duct 10.

For this purpose, another bending roller and a die roller different in the inclination angle of the circumferential surface can be variably applied.

8 is a plan view showing a configuration of a slender member bending apparatus according to another embodiment of the present invention.

Referring to FIG. 8, the elongated member (single pipe assembly) bending apparatus 200 includes a movable bending tool 210 and a counter tool 230.

 The movable bending tool 210 may include a bending roller 210 that is rotated in contact with the elongated member 15 and at the same time the support shaft 211a is rotatably disposed at an angle? The counter tool 230 may include a die roller 231 that is fixedly disposed on the opposite side of the bending roller 210 and slidably supports the elongate member 15 on its outer circumferential surface.

The elongate member bending apparatus 200 may further include a contact roller 240 that presses and supports the elongate member 15 in the Y axis direction perpendicular to the longitudinal axis X thereof.

The circumferential surfaces of the bending roller 210, the die roller 230, and the contact roller 240 are formed to be inclined so that the elongated member is bent at a certain radius of curvature in a tilted state. This structure is substantially the same as that shown in FIG. 6, so that a duplicate description will be omitted.

As described above, the bending apparatus according to the present invention may include any type of movable bending tool and counter tool capable of bending the elongated member with a certain radius of curvature and simultaneously in a tilted state.

Although the present invention has been described with reference to the accompanying drawings and the preferred embodiments described above, the present invention is not limited thereto but is limited by the following claims. Accordingly, those skilled in the art will appreciate that various modifications and changes may be made thereto without departing from the spirit of the following claims.

10: transfer duct 11: bending part
15: elongated member (unit pipe assembly) 100: bending device
110, 210: movable bending tool 111, 112, 211: bending roller
111a, 112a: movable shafts 111b, 112b: grooves
130, 230: counter tool 131, 231: die roller
131a: fixed shaft 131b: groove
160: driving device 240: contact roller

Claims (25)

A bending apparatus for bending a member (elongated member) having a longer length than a cross-sectional area,
A movable bending tool moving to a predetermined position while the elongated member is moved to press the elongated member to have a predetermined curvature; And
A counter tool fixedly disposed on the opposite side of the movable bending tool to support the elongated member;
/ RTI >
Wherein the movable bending tool includes a bending inclined surface that slidably contacts the longitudinal side surface of the elongated member to form the elongated member at a predetermined twist angle,
Wherein the counter tool includes a counter sloped surface corresponding to the bending sloped surface. The method according to claim 1,
Wherein the movable bending tool includes at least one bending roller supported by a movable shaft movable through a drive device. 3. The method of claim 2,
Wherein the counter tool includes at least one die roller rotatably supported by a fixed shaft fixed to a fixed position facing the bending roller. The method of claim 3,
The bending inclined surface is formed to be inclined downward or upward at an angle with respect to the movable shaft along the outer periphery of the bending roller,
And the counter slant surface is inclined so as to correspond to the movable slant surface along the outer periphery of the die roller. 5. The method of claim 4,
And a groove corresponding to an outer contour of the elongated member is formed on the bending inclined surface and the counter inclined surface. 6. The method of claim 5,
Wherein the movable bending tool includes two bending rollers disposed at regular intervals,
Wherein the counter tool includes one die roller facing the two bending rollers and disposed between the two bending rollers,
Wherein the bending roller is configured to move linearly so that the distance between the center of the bending roller and the center of the bending roller becomes narrow. 6. The method of claim 5,
Wherein the movable bending tool includes a bending roller in which the movable shaft is rotatably disposed at a predetermined angle,
Wherein the counter tool comprises a die roller fixedly disposed on the opposite side of the bending roller,
And a contact roller fixedly disposed on one side of the bending roller to support the elongate member. The method according to claim 1,
A plurality of movable bending tools and counter tools having different bending slopes and counter slopes are provided so as to be adapted to be varied according to the twist angle required by the elongate members. 9. The method according to any one of claims 1 to 8,
Wherein the elongate member comprises a pipe or a bar. 10. The method of claim 9,
Wherein the elongate member comprises a pair of pipes connected longitudinally via a pin. A bending method for bending a member (elongated member) having a longer length than a cross-sectional area,
The elongated member moves the movable bending tool to a predetermined position while passing between the movable bending tool and the counter tool so that the elongated member is pressed at a predetermined curvature and at the same time, Is bent so as to have a predetermined torsion angle. 12. The method of claim 11,
Wherein the movable bending tool includes at least one bending roller rotatably supported on a movable shaft movable to the predetermined position and having an outer circumference inclined at a twist angle of the elongate member with respect to the movable axis,
Wherein the counter tool is rotatably supported by a fixed shaft fixedly disposed at the predetermined position and includes at least one die roller whose outer periphery is inclined relative to the outer peripheral surface of the bending roller with respect to the fixed shaft, Lt; / RTI > 13. The method of claim 12,
Wherein an outer circumferential surface of the bending roller is inclined upward or downward with respect to the fixed shaft,
Wherein the die roller is inclined so as to correspond to an outer circumferential surface of the bending roller. 14. The method of claim 13,
And a groove corresponding to an outer contour of the elongated member is formed on an outer circumferential surface of the bending roller and the die roller. 15. The method according to any one of claims 11 to 14,
Wherein the elongate member comprises a pair of pipes connected via a pipe, a bar or a fin. 16. The method of claim 15,
Wherein the movable bending roller and the die roller are provided with various inclination angles of the outer circumferential surface in accordance with the twist angle of the elongated member so that the bending roller and the die roller are changed according to a required twist angle of the elongated member, Lt; / RTI > Forming a unit pipe assembly by connecting a pair of pipes longitudinally via a fin;
Propelling the unit pipe assembly between a movable bending tool and a counter tool;
The movable bending tool is moved to a predetermined position to press the elongated member at a predetermined curvature and the surface of the elongated member is brought into contact with the inclined surface provided to the movable tool and the counter tool to bring the elongated member into a predetermined twist angle Bending; And
Forming a cylindrical duct having a curved portion by connecting the bent unit pipe assembly in the bending step
Wherein the transfer duct is formed of a metal. 18. The method of claim 17,
Wherein the movable bending tool includes at least one bending roller rotatably supported on a movable shaft movable to the predetermined position and having an outer circumference tilted upward or downward,
Wherein the counter tool includes at least one die roller which is rotatably supported by a fixed shaft fixedly disposed at the predetermined position and whose outer periphery is inclined relative to the outer peripheral surface of the bending roller with respect to the fixed shaft,
And moving the bending roller to a predetermined position to bend the elongated member at a predetermined curvature and a predetermined twist angle. 19. The method of claim 18,
Wherein an outer peripheral surface of the bending roller is inclined upward or downward with respect to the movable shaft,
Wherein the die roller is inclined so as to correspond to an outer circumferential surface of the bending roller. 18. The method of claim 17,
Wherein a groove corresponding to an outer contour of the elongated member is formed on an outer circumferential surface of the bending roller and the die roller. 18. The method of claim 17,
The movable bending tool and the counter tool are variously provided to have a bending slope and a counter slope different in inclination angle according to the twist angle of the elongated member,
Wherein the bending roller and the die roller are changed according to a twist angle of the elongated member. 18. The method of claim 17,
Wherein the pipe is joined by automatic welding to form the unit pipe assembly. 23. The method of claim 22,
Wherein the automatic welding is a plasma welding method. 24. The method according to any one of claims 17 to 23,
Wherein the high-temperature fluid passes through the cylindrical duct. 25. The method of claim 24,
Wherein a coolant for cooling the high-temperature fluid flows through the inside of the pipe.

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