JP2002113521A - Bending roll - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bending roll capable of preventing barrel shape deformation of a tube generated in roll bending and manufacturing a small diameter and long tube. SOLUTION: An apparatus, which manufactures a tube by pressing a roll to a core roll, feeding a metal plate into its contact section and bending, consists of a core roll 1 made of metal and plural pressing rolls 2 which are arranged around the core roll 1 and whose surfaces are made of elastic bodies 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the manufacture of pipes by bending a metal plate by rolling, and more particularly to the manufacture of small-diameter and long pipes.

[0002]

2. Description of the Related Art There are two types of pipe production: continuous production by electric resistance welding and production by a bending roll apparatus using roll bending. The former has a large and expensive manufacturing machine and is suitable for mass production. In the latter, on the other hand, the production machine is inexpensive but not suitable for mass production. Here, in order to manufacture a thin and long pipe, in the conventional method of manufacturing by electric resistance welding, generally,
Forming and welding can be performed for a plate having a thickness of 0.01 times or more the pipe diameter, but a plate having a thickness of less than 0.01 times is generally not suitable for production by this method.

[0003] On the other hand, in the case of using a bending roll device, it is easy to form a thin pipe. However, when processing a long pipe with a long diameter using the bending roll device, the core roll itself becomes long. Direction, the deflection near the center of the roll increases, and the roll pushing amount in this portion decreases. For this reason, when the metal plate is molded into a pipe shape, as shown in FIG. 20, the product pipe becomes a barrel shape with a gap at the center in the longitudinal direction, and becomes prominent when a long pipe is molded. Therefore, when trying to manufacture a pipe using steel, generally, the diameter of the pipe is about 1 to 1 mm.
In many cases, it is difficult to mold a long pipe of 0 times or more by this method. For such a barrel-shaped deformation, starting with a bending roll device described in JP-A-08-117869, providing a crown on a core roll, or providing a backup roll on a pressing roll and intentionally bending in the width direction, There has been an attempt to solve the above problem by keeping a constant interval between the core roll and the pressing roll.

[0004]

However, a conventional core roll is provided with a crown, and a backup roll is provided on a pressing roll so that the core roll and the pressing roll are deliberately bent in the width direction so as to maintain a constant interval between the core roll and the pressing roll. Even if it is attempted to eliminate the barrel-shaped deformation in this way, when trying to form a small-diameter and long pipe as a workpiece, the core roll deflection becomes too large and cannot be sufficiently compensated by the above technique. For example, a long pipe having a diameter of 50 mm and a length of 2000 mm could not be formed by roll bending. The present invention has been proposed in view of the above circumstances, and an object of the present invention is to provide a bending roll capable of manufacturing a small-diameter long pipe.

[0005]

A bending roll according to the present invention is an apparatus for manufacturing a pipe in which a roll is pressed against a core roll and a metal plate is fed to a contact portion thereof to perform a bending process. And, when bending the metal plate, contact the circumference of the core roll and install multiple pieces,
It is characterized by comprising a pressing roll having a surface portion made of an elastic body, and a device for manufacturing a pipe by pressing a roll against a core roll, feeding a metal plate to a contact portion thereof and performing a bending process, and manufacturing a pipe. It is characterized by comprising a core roll and a pressing roll having a surface portion made of an elastic body and arranged linearly in contact with and sandwiching the core roll when bending a metal plate. Here, it is particularly advantageous to use a long, small-diameter core roll having a width at least 10 times the diameter of the portion where the metal plate is fed and bent.

Further, at the time of feeding and bending a metal plate,
The core roll is characterized by causing a part or all of the surface of the core to be magnetized, especially the core roll is made of a magnetic material,
An electromagnetic coil provided on a core roll at an appropriate position in a portion where a metal plate is fed and not bent is used to attract the metal plate to the core roll at the time of feeding and bending the metal plate. Also, a metal plate having a moving mechanism that moves to a position where the pressing roll does not intervene and presses against the surface of the core roll when the metal plate is bent, and a guide body through which the metal plate surface slides easily. A guide device is provided.

[0007] In the bending roll,
On the circumference of the core roll, between the pressing roll contact portion, a guide belt that is driven synchronously with the core roll is provided.
Interposed between each of the core roll and the plurality of pressing rolls,
Pass the core roll surface opposite to the side where the metal plate is drawn in,
A metal plate guide belt driven synchronously with the core roll is provided. Here, a configuration is provided in which a metal plate guide device having a moving mechanism that moves to a position where the guide belt is not provided and pressed to the surface of the core roll, and a guide body through which the metal plate surface easily slides, and Preferably, a guide band is provided on the pressing roll side of the guide belt, and a groove for inserting the guide band is formed on the surface of the pressing roll. Further, a groove is provided in the circumferential direction on each of the pressing rolls at the portions where the belt pulleys which support the divided guide belt in contact with and support the core roll interfere with each other.

A metal core roll, a plurality of surface elastic body pressing rolls in contact with the metal core roll, and a wrapping belt having one end adhered and fixed to the surface of the core roll and the other end fixed to a tension roll. The tension belt is provided with a torque limiter that couples the winding belt wound around the core roll in synchronization with the rotation of the core roll and a brake that applies a constant tension in the winding direction when unwinding, and a unwinding direction drive mechanism. It is a feature.

A metal plate as a pipe material enters between a core roll and a first pressing roll having an elastic body surface, and surrounds the core roll with second and third pressing rolls having an elastic body surface. Is formed in a pipe shape while passing through a contact portion of the pipe.

[0010] Here, when bending the metal plate, a plurality of pressing rolls are brought into contact with each other around the core roll and opposed to each other.
The deflection of the core roll can be canceled and the product can be prevented from becoming barrel-shaped. In addition, after the metal plate is processed by the first pressing roll, a spring bag is generated, and a state in which the core roll and the metal plate are separated occurs, but at least the core roll is magnetized at the time of bending processing. The metal plate is magnetically attached to the core roll, and the metal plate can be processed so as to follow the core roll, and the tip can be inserted well between the second and subsequent pressing rolls and the core roll. Further, between the contact portions of the pressing rolls, there is provided a moving mechanism for moving to a position where the metal plate is pressed against the surface of the core roll, and a guide body through which the metal plate surface easily slides, or a guide belt which is driven synchronously with the core roll. Thus, similarly, the metal plate can be inserted between the core roll and the pressing roll, so that a smooth bending process can be performed.

In addition, a metal plate is wound between the winding belt wound around the core roll in synchronization with the rotation of the core roll and the core roll, and the core roll and the pressing roll are mainly bent. At this time, when the winding belt is wound in accordance with the rotation of the core roll, the winding belt has a brake mechanism for applying a constant tension in the winding direction, and the metal plate is reliably supplied to the core roll. I can do it. Therefore, the metal plate is processed so as to be along the core roll without being lifted at the position of each pressing roll, thereby preventing springback. In addition, since the tension roll having the unwinding direction driving mechanism is provided, the winding belt is reversely rotated to the core roll mounting position after the bending, so that the metal plate after the bending can be taken out without any trouble. I can do it.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a bending roll according to the present invention will be described with reference to the drawings. 1 and 2 show a first embodiment in which two pressing rolls are provided. FIG. 1A is a front view, FIG. 1B is a side view, and FIG. 2 shows the operation of the pressing roll. FIG. The bending roll according to this embodiment includes a core roll 1 serving as a center of the metal sheet 6 for feeding and bending, two pressing rolls 2A and 2B provided above and below the core roll 1, and a frame supporting these rolls. Consists of body 3.

The core roll 1 is composed of a core roll normally used as a bending roll, for example, a core roll 1 made of an appropriate metal such as iron, and is rotatably supported by the frame 3. The pressing roll 2 has an elastic body 21 provided on the surface of the normal pressing roll 1. The pressing rolls 2 are arranged vertically on one straight line so as to sandwich the core roll 1. Here, the elastic body 21 provided on the pressing roll 2 is
For example, a rubber material is used, and its thickness is generally about 20 mm to 100 mm in order to have sufficient deformability.

The pressing roll 2 is provided with a roll elevating device 4
As a result, it can be raised and lowered, can be pressed against the core roll 1, and can be rotated by an appropriate power source such as a motor 50. The roll pressing device 4 is, for example, as shown in FIG.
As shown in (b), guides 41 provided at both ends of a support 40 holding both ends of the pressing roll 2.
Is slidable on a rail 42 provided on the side surface of the column portion of the frame 3, and a pressing roll is pressed against a core roll by a cylinder 43 provided at a lower portion of the support 40 and appropriately constituted by a power source such as hydraulic pressure. It is possible. Although the roll pressing device 4 located above is not particularly shown, the same roll pressing device 4 as described above is used, or a pressing device for a pressing roll of a conventional bending roll is used. In the drawing, reference numeral 60 denotes a core roll chock, and reference numeral 61 denotes a core roll chock support device.

Next, the manufacture of a pipe using the above-mentioned bending roll will be described. The first pressing roll 2 </ b> A and the second pressing roll 2 </ b> B move from the retracted state from the core roll 1 in the direction of the arrow in FIG. 2A, and move so that each pressing roll 2 presses against the core roll 1. (FIG. 2 (b)). From this state, the metal plate 6 to be the pipe material enters from between the core roll 1 and the first pressing roll 2A, and the metal plate 6 is subjected to roll bending by the core roll and the pressing roll 2A (FIG. 2 (c)). )). Next, when the leading end of the metal plate 6 reaches the pressing roll 2B, the core roll 1 and the pressing roll 2B are further subjected to roll bending, and the core roll 1 is rotated substantially once, thereby completing the roll bending (FIG. 2). (D)). Thereafter, the rotation of each roll is stopped, the pressing rolls 2A and 2B are retracted, the metal plate formed into a pipe shape is extracted from the core roll 1, and the end is completed through a welding process (not shown).

FIG. 3 shows a second embodiment in which three pressing rolls each having two pressing rolls 2 above the core roll 1 and one pressing roll 2 below the core roll 1 are used. FIG.
Shows a third embodiment in which pressing rolls 2 are provided on both sides of a core roll 1 in addition to the roll arrangement of the embodiment of FIG. In the drawings, the pressing roll pressing device 4 is described only for the pressing roll 2 located below as in the case of the two pressing rolls. 3 pressing rolls 2
5 is an example in which four pressing rolls 2 are provided. As shown in FIG. 6, a core roll 1 and a first pressing roll 2 are provided.
Unlike the first embodiment, the tip of the metal plate 6 that has been roll-bent in A differs from the first embodiment in that the next pressing roll 2B is relatively soon.
The metal plate 6 does not bend or break to reach the next pressing roll while the size of the metal plate 6 separating from the core roll 1 is small by reaching
Smooth roll bending can be performed. The finish is better as the number of pressing rolls 2 is larger. However, the use of five or more rolls complicates the mounting structure of the pressing rolls, and the unit price of the rolls is not necessarily low. And preferably four or less.

Next, FIG. 7 shows a fourth embodiment in which a magnet is attached to a core roll. A permanent magnet 11 is provided on the inner surface of the core roll 1 in the longitudinal direction. The permanent magnet 11 built in the core roll 1 functions to magnetically attach the tip of the metal plate 6 to the core roll 1 and mainly prevents the tip from being lifted by the springback of the metal plate 6. In addition to this, when starting roll processing,
For example, when the metal plate 6 is caused to penetrate horizontally toward the core roll 1, the tip of the metal plate 6 is magnetically attached to the permanent magnet 11, and the tip of the metal plate 6 is completely located at substantially the same position as the core roll 1 in the longitudinal direction. By magnetically attaching the front end, the front end of the metal plate 6 can be inserted at right angles to the core roll, and the metal plate 6 is inserted straight along the rotation of the core roll 1, and the pressing roll 2
Can be bent.

After the roll bending process is completed, it seems that it is difficult to take out the metal plate 6 from the core roll 1 while the metal plate 6 is attracted to the core roll 1 by the permanent magnet 11. As shown, the magnetic force F1 when a metal plate is magnetically attached to the permanent magnet 11 acts vertically from the surface of the permanent magnet 11 and has no horizontal component. Therefore, when the metal plate 6 is pulled out in the horizontal direction at the end of the roll bending,
The pulling force F is only the contact resistance F2 of the surface of the core roll 1, and the metal plate 6 is easily attached to the core by the permanent magnet 11 having a size that magnetizes only the vicinity of the tip of the metal plate 6 as in the above embodiment. It can be pulled out of the roll 1.

Unlike the embodiment, in the case of a large-sized magnet, the magnetic attraction area increases, and accordingly, the contact resistance increases, which makes pulling out difficult. As shown, a roll made of a magnetic material is used for the core roll 1 and the electromagnetic coil 51 is provided at a portion where the metal plate 6 of the core roll 1 is fed and bending is not performed. Then, when the core roll is given magnetism and the processed metal plate 6 is pulled out from the core roll 1, the power supply to the electromagnetic coil 51 is stopped, and the magnetism of the core roll 1 is released to pull out the metal plate 6 from the core roll 1. I can do it. In the embodiment using the electromagnetic coil 51, the entire metal plate 6 is magnetically bonded, so that springback of the metal plate 6 can be completely prevented.

FIGS. 10 to 11 show an embodiment using a metal plate guiding device. Here, the core roll 1 and the pressing rolls 2 are provided vertically above and below the core roll 1, and the rails 71 of the base 70 provided on the left and right sides of the core roll 1 are moved forward to a position where the guide body 72 is pressed against the roll surface. Also, a moving mechanism 73 that can retreat to a position where it does not hinder removal of the processed product is mounted. The guide body is preferably made of a resin material such as hard nylon so as not to scratch the partner when the guide body comes into contact with the metal plate 6 or the core roll 1, for example. In addition,
The moving mechanism uses a known power source such as a motor 50.
Here, the metal plate 6 is supplied between the core roll 1 and the pressing roll 2B (FIG. 11 (a)), and is roll-bent between the two rolls. 1 while being pressed against the surface (Fig. 1
1 (b)). The tip of the metal plate 6 is pressed against the pressing roll 2A
Is passed, the metal guide device 7B moves forward and the core roll 1
Is bent while pressing the metal plate 6 against the surface of the substrate (FIG. 11C). After the bending process is completed, the metal plate guide devices 7A and 7B are respectively retracted from the core roll 1, and the bent cylindrical metal plate can be removed from the core roll (FIGS. 11D and 11E). ). As described above, each time the tip of the metal plate passes between the press rolls, the guide plate between them moves, and the metal plate is pressed to perform bending. Since the tip of the metal plate is in close contact with the core roll while being held down by the guide body, it can be inserted into the next press roll without passing through unreasonable deformation, so that processing can be performed reliably.

FIGS. 12 to 17 show an embodiment using a guide belt. A core roll 1 and pressing rolls 2 above and below the center roll are provided, and a guide belt 8 is provided between the contact portion between the core roll 1 and the upper and lower pressing rolls 2 to be driven synchronously with the core roll 1 and the rotation speed. The metal plate 6 is roll-bent by the core roll 1 and the pressing roll 2A, and then the leading end of the metal plate 6 is inserted between the guide belt 8 and the core roll 1. Since the guide belt 8 is driven in synchronization with the rotation speed of the core roll 1, the tip of the metal plate 6 is transferred to the pressing roll 2 </ b> B with the rotation of the core roll 1, and a smooth roll bending process is performed. Done. The guide belt 8 is made of a fiber cloth in which a surface of a polyester or nylon fiber base material is coated with a urethane rubber so that the guide belt 8 can be flexibly adjusted even when wound around the core roll 1. The position where the guide belt is provided is not particularly limited, but is preferably provided at least at the center of the roll because the speed of the center of the roll is reduced when the roll is deformed into a barrel shape.

FIG. 13 shows an embodiment for increasing the contact portion between the metal plate 6 and the guide belt 8. A groove 22 is provided in the elastic body 21 of the pressing roll 2 in the circumferential direction. And
As shown, a guide belt 8 divided in the longitudinal direction of the core roll 1 is inserted into the groove 22 while being supported by a belt pulley 80. Further, the guide belt is provided at a position where the pressing roll of the core roll 1 is not provided as shown in FIG. Can increase the contact surface of the front end portion of the core roll 1 with the core roll 1. In this case, it goes without saying that the guide belt 8 is provided at a position where the supply of the metal plate 6 to the core roll 1 is not hindered.

Next, the embodiment of the guide belt 8 shown by the arrow in FIG. 14 has a configuration in which the guide belt is hung on the route of the pressing roll 2A-core roll 1-pressing roll 2B-tension roll 81-pressing roll 2A. ing. Then, the surface of the core roll 1 is released on the side of the core roll 1 on the side where the guide belt 8 is not applied (on the front side in FIG. 14) so that the metal plate 6 is drawn in. With such a configuration, besides preventing the spring bag of the metal plate 6, the guide belt 8 can be wound around the core roll 1 for about half a turn, thereby preventing the core roll 1 itself from bending. . Here, similarly to the core roll, the tension roll 81 is formed of, for example, metal, and its position can be changed by appropriate means to apply and release tension to the guide belt 8.

The embodiment shown in FIGS.
In this embodiment, the above-described metal plate guiding device is provided on the surface of the core roll having no guide belt, and the configuration is the same as that of the embodiment of FIG. I do. Then, the pressing rolls 2A and 2B are brought into close contact with the core roll 1 while moving the tension roll 81 to apply tension to the guide belt 8 (FIG. 16A).
Next, while the guide belt 8 is wound around the core roll 1, the core roll 1 is driven and the metal plate 6 is inserted. The metal plate 6 passes between the core roll 1 and the pressing roll 2B while being sandwiched by the guide belt 8, and is formed. Then, even after leaving the pressing roll 2B, the metal plate 6 adheres to the core roll 1 while being sandwiched between the guide belts 8, so that the metal plate 6 passes through the next pressing roll 2A without undue deformation (FIG. 16 ( b)). Thereafter, the metal plate 6 is kept pressed against the surface of the core roll 1 by the metal plate guide device 7, so that a spring bag can be prevented. Finally, after the metal plate 6 is formed into a pipe shape, the tension roll 81 is moved to the loosened position, the pressing rolls 2A and 2B are released from the core roll 1, and the metal plate guide device 7 is retracted, whereby the belt is moved. After loosening, the pipe 6 can be taken out from the core roll 1 in the axial direction (FIG. 16D).

In the embodiment shown in FIG. 17, a guide belt is provided with a guide band. That is, a convex guide band 82 is provided on the side of the pressing roll of the guide belt 8. Then, the groove 23 for inserting the guide band 82 is pressed into
A, 2B. Further, a similar groove 83 is provided in the tension roll 81. The guide band 82 is inserted into the groove 23 of the pressing rolls 2A and 2B to prevent meandering and wrinkling during the operation of the wide belt, and the metal plate wound around the core roll does not slip and does not cause excessive deformation. Therefore, cylindrical molding accuracy can be improved.

FIGS. 18 and 19 show an embodiment in which a wrapping belt is used by winding it around a core roll. That is, a plurality of pressing rolls 2A and 2B of the surface elastic body which are in contact with the upper and lower portions of the metal core roll 1 are provided. Then, one end is adhesively fixed to the surface of the core roll 1, and the other end is a tension roll 9.
A winding belt 9 fixed to 0 is provided. The winding belt 9 uses, for example, a method in which the tip is inserted into a slit provided in the core roll 1 and fixed with an adhesive. The tension roll 90 is connected to an unwinding direction drive mechanism 92 with a torque limiter 91 connected between the brake for applying a constant tension in the winding direction and the unwinding direction interposed therebetween. Here, the torque limiter 91 is, for example, pressed between the tension roll 90 and the shaft of the unwinding direction drive mechanism 92 by a predetermined force and is opposed to the two friction surfaces 91.
A and 91B are provided, and a resistance torque by the frictional force is given. And the unwinding drive mechanism 9
When the rotation of the torque limiter 2 is stopped, the friction surfaces 91A and 91B
Slip, the tension is applied to the winding belt 9 by the resistance torque, and conversely, only a small torque is required in the direction in which the winding belt 9 is released from the core roll 1, so that the friction surface 91A,
91B are connected.

The unwinding direction drive mechanism 92 uses, for example, a motor with a brake that rotates in the unwinding direction. Then, the metal plate 6 is placed on the winding belt 9 (FIG. 1).
9 (a)), the core roll 1 is rotated, and the pressing roll 2A,
Bending is performed at 2B. The winding belt 9 is wound around the core roll 1 in synchronization with the rotation of the core roll 1. At this time, the unwinding direction drive mechanism 92 is stopped and acts as a brake that applies a constant tension to the winding belt 9 when the winding belt 9 is wound by the resistance torque of the torque limiter 91. Is pulled at a constant tension,
The metal plate 6 on the wrapping belt 9 is made up of each pressing roll 2A, 2
Processing is performed along the core roll 1 without rising at the position B (FIGS. 19B and 19C). After the bending is completed, the pressing rolls 2A and 2B are
, The torque limiter 91 and the unwinding direction drive mechanism 92 are operated, and the winding belt 9 is
The metal plate 6 after bending is taken out from the core roll 1 in the state shown in FIG.

In this embodiment, after the metal plate is bent by the core roll and the presser roll, the belt is brought into close contact with the core roll until the tail end of the metal plate is wound on the core roll. When the metal plate tip passes between the core roll and the plurality of press rolls, it is fed at the desired curvature and does not cause excessive deformation, thereby improving cylindrical molding accuracy. be able to. Further, since the metal plate is mounted on the belt and the leading end can be inserted into the core roll, there is no need to separately provide a metal plate insertion mechanism.

[0029]

Now, in the apparatus of the embodiment shown in FIG. 1, the core roll 1 has a diameter of 50 mm and the pressing roll 2 has a diameter of 4 mm.
The thickness of the elastic part made of urethane rubber is 50 mm, and the metal plate 6 used is made of steel and has a thickness of 0.5 mm.
The core roll 1 is 500 mm / m.
In, roll bending was performed with a pressing force of the pressing roll 2 of about 10 tons. Metal plate 6 after bending
Could be molded almost in a straight line at the ends, there was almost no gap at the center, and the barrel was not formed.

[0030]

According to the bending roll of the present invention,
It is now possible to stably produce small-diameter and long pipes that could not be formed conventionally. According to the first to third and thirteenth aspects of the present invention, since the deflection of the core roll can be prevented beforehand, the finished product can be prevented from so-called barrel-shaped deformation, and a small-diameter, long pipe can be molded. According to the fourth or fifth aspect of the present invention, at the time of feeding and bending the metal plate, the tip of the metal plate can be magnetically attached to the surface of the core roll. According to the inventions described in claims 6 to 12, by pressing the metal plate itself against the core roll, the tip of the metal plate can be well inserted into the pressing roll, and a pipe having a good finish can be manufactured.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a bending roll provided with two pressing rolls according to the present invention, wherein (a) is a front view and (b) is a side view.

FIG. 2 is an explanatory diagram showing an operation state of the bending roll according to FIG. 1;

FIGS. 3A and 3B are explanatory views of a bending roll provided with three pressing rolls according to the present invention, wherein FIG. 3A is a front view and FIG. 3B is a side view.

4A and 4B are explanatory views of a bending roll provided with four pressing rolls according to the present invention, wherein FIG. 4A is a front view and FIG. 4B is a side view.

FIG. 5 is an explanatory view showing an operation state of the bending roll according to FIG. 3;

FIG. 6 is an explanatory diagram showing an operation state of the bending roll according to FIG. 4;

FIG. 7 is an explanatory view showing an operation state of an embodiment in which a permanent magnet is provided on a core roll of the bending roll of the present invention.

FIG. 8 is an explanatory diagram of a force exerted by a permanent magnet on a metal plate.

FIG. 9 is a schematic perspective view of an embodiment in which an electromagnetic coil is provided on a core roll.

FIG. 10 is a perspective view showing an embodiment in which a metal plate guiding device is provided between two pressing rolls according to the present invention.

11 is an explanatory diagram showing an operation state of the embodiment shown in FIG.

FIG. 12 is a perspective view of an embodiment in which a guide belt is provided between two pressing rolls according to the present invention.

FIGS. 13A and 13B are explanatory views of an embodiment in which the guide belt is divided, wherein FIG. 13A is an enlarged sectional view with a partial cutout, and FIG. 13B is a side view with a partial cutout.

FIG. 14 is a perspective view of an embodiment in which a guide belt is provided between two pressing rolls according to the present invention.

FIG. 15 is a perspective view showing an embodiment using a metal plate guiding device in the embodiment of FIG. 14 according to the present invention.

FIG. 16 is an explanatory diagram showing an operation state of the embodiment shown in FIG.

FIG. 17 is a perspective view showing an embodiment in which a guide band is provided on the guide belt of the embodiment shown in FIG. 14;

FIG. 18 is a perspective view of an embodiment in which the winding belt according to the present invention is used by being wound around a core roll.

FIG. 19 is an explanatory diagram showing an operation state of the embodiment shown in FIG.

FIG. 20 is a perspective view of a conventional barrel-shaped pipe formed by roll bending.

DESCRIPTION OF SYMBOLS 1 core roll 11 permanent magnet 2 pressing roll 21 elastic body 22 groove 23 groove 3 frame 4 roll pressing device 40 support 41 guide 42 rail 43 cylinder 50 motor 51 electromagnetic coil 6 metal plate 60 chock 61 chock support Apparatus 7 Metal plate guide device 70 Base 71 Rail 72 Guide body 73 Moving mechanism 8 Guide belt 80 Belt pulley 81 Tension roll 82 Guide band 83 Groove 9 Winding belt 90 Tension roll 91 Torque limiter 92 Unwinding direction drive mechanism

 ──────────────────────────────────────────────────の Continuing from the front page (72) Inventor Hiroo Ishibashi 20-1 Shintomi, Futtsu-shi, Chiba Nippon Steel Corporation Technology Development Division (72) Inventor Hiroyuki Mitake 20-1 Shintomi, Futtsu-shi, Chiba New Japan (72) Inventor Shizuo Obinata 20-1 Shintomi, Futtsu-shi, Chiba F-term (Reference) 4N063

Claims (13)

[Claims] An apparatus for manufacturing a pipe by pressing a roll against a core roll and feeding a metal plate to a contact portion thereof to perform a bending process, comprising: a core roll made of metal; A bending roll, comprising a plurality of pressing rolls having a surface portion made of an elastic body in contact with the pressing roll. 2. An apparatus for manufacturing a pipe by pressing a roll against a core roll and feeding a metal plate to a contact portion thereof to perform a bending process, wherein the core roll made of metal is sandwiched between the core roll and the metal plate when the metal plate is bent. A bending roll comprising: a pressing roll which is disposed in a straight line in contact with the pressing member and has a surface portion made of an elastic body. 3. A part for feeding and bending a metal plate,
The bending roll according to any one of claims 1 and 2, wherein a long and small diameter core roll having a width of 10 times or more the diameter is used. 4. The bending roll according to claim 3, wherein a part or all of the surface of the core roll is magnetized during feeding and bending of the metal plate. 5. The core roll is made of a magnetic material, and the metal plate is fed to the core roll by the electromagnetic coil provided on the core roll at an appropriate position in a portion where the metal plate is not fed and bent. 5. The bending roll according to claim 4, wherein the bending is performed. 6. A moving mechanism for moving a metal plate to a position where the pressing roll does not intervene and press against the surface of the core roll when the metal plate is bent, and a guide body through which the metal plate surface slides easily. The bending roll according to any one of claims 1 to 5, further comprising a metal plate guiding device having the bending plate. 7. The bending according to claim 1, wherein a metal plate guide belt that is driven synchronously with the core roll is provided on the circumference of the core roll and between the pressing roll contact portions. roll. 8. A metal plate guide belt interposed between each of the core roll and the plurality of pressing rolls, passing through the surface of the core roll opposite to the side where the metal plate is drawn in, and synchronously driven with the core roll. The bending roll according to any one of claims 1 to 5, characterized in that: 9. The guide according to claim 7, further comprising a moving mechanism for moving to a position where the guide belt is not provided and pressed to a surface of the core roll, wherein the metal plate surface slides easily. A bending roll characterized by providing a body. 10. The bending according to claim 7, wherein a groove provided in a circumferential direction is provided in each of the pressing rolls at a portion where a belt pulley that supports the divided guide belt in contact with and supports the core roll interferes. roll. 11. The bending roll according to claim 8, wherein a guide band is provided on the pressing roll side of the guide belt, and a groove for inserting the guide band is formed on the surface of the pressing roll. 12. A metal core roll and a plurality of surface elastic body pressing rolls in contact with the metal core roll, and a wrapping belt having one end adhered and fixed to the surface of the core roll and the other end fixed to a tension roll. The tension belt is provided with a torque limiter that couples a brake that imparts a constant tension in the winding direction with a brake that applies constant tension in the winding direction and a torque unwinding drive mechanism that unwinds the winding belt wound around the core roll in synchronization with the rotation of the core roll. Characteristic bending roll. 13. A second pressing member having a surface of an elastic body around a core roll, wherein a metal plate serving as a pipe material enters while being sandwiched between a metal core roll and a first pressing roll having an elastic body surface. A pipe forming method, wherein the pipe is formed while passing through a contact portion with a roll.