JP2003225711A - Bending roll - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bending roll with which the barrel type deformation of a pipe occurring at roll bending is prevented and a small-diameter and long- length pipe is manufactured. <P>SOLUTION: This bending roll consists of: a core roll 1 made of metal, a plurality of pressing rolls 2A, 2B made of metal and installed so as to come in contact with the circumference of the core roll 1 when bending a metallic plate 6; and a guide belt 8 which is interposed respectively between the core roll 1 and one of the plurality of pressing rolls 2A, 2B and between the core roll 11 and the other of the pressing rolls, runs on the surface of the surface of the core roll on the opposite side to a side where the metallic plate 6 is pulled in, is made of an elastic body and is driven in synchronism with the core roll. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art Pipes can be manufactured by a method in which they are continuously manufactured by electric resistance welding or by a bending roll machine by roll bending. The former is a large-scale and expensive manufacturing machine and is suitable for mass production. On the other hand, the latter is not suitable for mass production though the manufacturing machine is inexpensive. Here, when trying to manufacture a thin and long pipe, in the conventional method of manufacturing by electric resistance welding, in general,
Forming and welding can be performed for plates with a thickness of 0.02 times the pipe diameter or more, but it is difficult to obtain stable forming quality for plates with a thickness less than 0.02 times. Is not suitable.

On the other hand, in the case of using a bending roll device, it is easy to mold a thin pipe, but when it is attempted to process a long pipe having a long diameter with the bending roll device, the core roll itself becomes long. Bending in the direction, the bending near the central portion of the roll becomes large, and the amount of roll pushing in at this portion becomes small. For this reason, when a metal plate is molded into a pipe shape, as shown in FIG. 13, a product pipe becomes a barrel shape with a gap at the center in the longitudinal direction, which becomes remarkable when a long pipe is molded. Therefore, when trying to manufacture a pipe using steel material, in general, the diameter of the pipe is about 1
It was difficult to form a pipe having a length of 0 times or more with high precision by this method using a bending roll, and a corrective means was separately required. Against such barrel-shaped deformation, including the bending roll device described in JP-A-08-117869, the core roll is provided with a crown, and the pressing roll is provided with a backup roll to intentionally bend in the width direction, There has been an attempt to solve the above problem by keeping a constant gap between the core roll and the pressing roll.

[0004]

However, by providing a crown on a conventional core roll or by providing a backup roll on the pressing roll to intentionally bend it in the width direction, the core roll and the pressing roll are kept at a constant distance. Thus, even if an attempt is made to eliminate the barrel-shaped deformation, when a small-diameter long pipe is formed according to the conditions such as the material of the work piece and the desired molding size, the bending of the core roll is large. However, it is not possible to fully compensate for the elimination of barrel-shaped deformation by the above technique. For example, diameter 50mm and length 2000m
A long pipe such as m could not be formed by roll bending. The present invention has been proposed in view of the above circumstances, and an object thereof is to provide a bending roll capable of manufacturing a small-diameter long pipe.

[0005]

A bending roll according to the present invention is a core roll made of metal in an apparatus for manufacturing a pipe by pressing a roll against a core roll and feeding a metal plate to the contact portion to perform bending. And, when bending the metal plate, contact the circumference of the core roll and install multiple pieces,
A guide consisting of a pressing roll made of metal, and an elastic body 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 for drawing in the metal plate, and driven synchronously with the core roll. A belt, and a device for manufacturing a pipe by pressing a roll against a core roll and feeding a metal plate to the contact portion to perform bending processing, wherein a core roll made of metal and a metal plate When bending, the core roll is sandwiched to contact and arranged in a straight line, and the pressing roll made of metal, and interposed between each of the core roll and the plurality of pressing rolls, on the side opposite to the side for drawing in the metal plate. The guide belt is made of an elastic body that passes through the surface of the core roll and is driven synchronously with the core roll. Here, it is more beneficial to use a long and small diameter core roll having a width 10 times or more the diameter, particularly in the portion where the metal plate is fed and bent.

Further, when the metal plate is bent, a moving mechanism for moving the metal plate to a position where it is pressed against the surface of the core roll on the side where the metal plate is pulled in at the time of forward movement, a guide body through which the metal plate surface easily slides, or A metal plate guide device having a guide roller is provided.

Further, it is characterized in that the guide belt made of an elastic body on the side contacting the surface of the core roll is provided with a cut in the longitudinal direction of the core roll, and the bend radius of the guide belt is reduced by the cut.

In a device for manufacturing a pipe by pressing a roll against a core roll and feeding a metal plate to the contact portion to perform bending, a core roll made of metal is contacted with the periphery of the core roll when bending the metal plate. And install multiple,
A pressing roll made of metal, and a bend made of an elastic body interposed between each of the core roll and the plurality of pressing rolls, passing through the side of the core roll opposite to the side for drawing in the metal plate, and driven synchronously with the core roll. It is characterized by comprising a belt and a guide belt which passes between the core roll and the curved belt and is driven synchronously with the core roll.

Further, a metal core roll, a plurality of pressing rolls contacting the core roll, a winding belt made of an elastic body having one end adhered and fixed to the surface of the core roll and the other end fixed to a tension roll, The winding belt that winds around the core roll in synchronization with the rotation of the core roll is provided with a brake that applies constant tension in the winding direction, a torque limiter that connects the winding belt when unwinding, and a drive mechanism for unwinding direction to the tension roll. And

Here, when bending the metal plate, a plurality of pressing rolls are placed in contact with each other around the core roll so as to face each other,
The bending of the core roll can be canceled to prevent the product from barreling. Then, after the metal plate is processed by the elastic guide belt and the first pressing roll, the metal plate is sandwiched between the guide belt and the core roll, and the core roll and the metal plate are separated from each other. Prevent. Further, a guide belt or a guide roller having a moving mechanism for moving to a position to be pressed against the core roll surface portion between the pressing roll contact parts, and a guide body or a guide roller through which the metal plate surface easily slides, or a synchronous drive with the core roll is provided. By providing, the metal plate can be inserted between the core roll and the pressing roll in the same manner,
It works so that smooth bending can be performed.

When a guide belt having a large elastic force is used, the bending process can be performed more reliably, but generally the guide belt is thick and runs along the outer circumference of a core roll of small diameter. Since it cannot be bent in a shape, in the present invention, a guide belt made of an elastic body on the side contacting the surface of the core roll is provided with a notch in the longitudinal direction of the core roll, and the bend radius of the guide belt is formed by the notch. The guide belt made of an elastic material is surely brought into close contact with the core roll having a small diameter, so that the core roller having a small diameter can be bent. In addition, the elastic belt is not bent at a small diameter core roll, and the elastic guide belt is used simply as a bending belt and has a weak elastic force to prevent spring back of the metal plate. The guide belt of (1) is interposed between the bending belt and the core roll so that it can be bent with a small diameter.

In addition, a metal plate is wound between the core belt and the winding belt wound around the core roll in synchronization with the rotation of the core roll, and the core roll and the pressing roll are mainly bent. At this time, when the winding belt is wound according to 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. You can Therefore, the metal plate is processed so as to be surely along the core roll without floating at the position of each pressing roll, and springback is prevented in advance. Also, since the tension roll having the unwinding direction drive mechanism is provided, by rotating the winding belt in the reverse direction to the core roll mounting position after bending, the bent metal plate can be taken out without trouble. I can.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION A bending roll according to the present invention will be described below 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. 1C is a side view showing a chock portion. 2 and 3 are explanatory views showing the operation of the pressing roll. The bending roll according to this embodiment includes a core roll 1 that serves as a center for feeding and bending a metal plate 6 and two pressing rolls 2 provided above and below the core roll 1.
A, 2B, a frame body 3 that supports these rolls, and an elastic guide belt 8 that is interposed between the core roll 1 and the upper and lower pressing rolls 2 and that can move in synchronization with the core roll 1 and the pressing roll 2. Become.

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 rotatably supported by a frame 3. The pressing roll 2 is made of an appropriate metal such as iron, and is rotatably supported by the frame body. Then, the pressing rolls 2 are arranged in a straight line vertically so that the core roll 1 is sandwiched therebetween.

As the pressing roll 2 described above, for example, a pressing roll pressing device which is a conventionally used bending roll is used. For example, it can be lifted and lowered by the roll lifting device 4 and can be pressed against the core roll 1, and
It can be rotated by an appropriate power source such as a motor 50. The roll pressing device 4 includes, for example, as shown in FIG. 1B, a pair of support bodies 4 that hold both ends of the pressing roll 2A.
0 is attached to a roll elevating device 4 such as a screw jack that elevates and lowers in synchronization, and the support 40 is moved up and down along the inner guide of the frame 3 by an appropriate power source such as an elevation drive motor 41. Note that the roll pressing device 4 may use a system in which a hydraulic cylinder or a balancing weight is attached in addition to the device shown in FIG. Also,
As for the chock that supports the core roll 1, the support 40
And a hanger 42 are connected to each other and are simultaneously moved up and down.

Next, the guide belt will be described. The guide belt 8 is driven between the core roll 1 and the pressing rolls 2 provided above and below the core roll 1 in synchronization with the core roll 1 and the rotation speed thereof. The pressing roll 2A-core roll 1-pressing The guide belt is hung on the route of the roll 2B-tension roll 81-pressing roll 2A.
Then, the surface of the core roll 1 is released for drawing in the metal plate 6 on the side surface of the core roll 1 on the side where the guide belt 8 is not applied. In this way, the guide belt 8 wraps and holds about half the circumference of the core roll 1, thereby preventing the spring bag of the metal plate 6. The tension roll 81
Like the core roll, the core roll is made of, for example, metal, and its position can be changed by an appropriate means such as the cylinder 80, and tension is applied to and released from the guide belt 8. The guide belt 8 is made of a fiber cloth having a urethane rubber film on the surface of a polyester or nylon fiber base material so that the guide belt 8 can be flexibly fit even when wound around the core roll 1. Here, the bending of the plate with the guide belt will be described. The deformation amount of the guide belt with respect to the rolling force for deforming the metal plate is given by the following relational expression relating to the belt thickness and the material. F = 8E ₀ bD ^1/2 δ ^3/2 ) / 3t (1) where F: load [Kg], D: roll diameter [mm],
t: belt thickness [mm], E ₀ : Young's modulus [Kg / mm ³ ] of the belt material, δ: flatness [mm]. Also,
The nip width W [mm] of the guide belt 8 is expressed by the following formula: W = 2 {(D / 2) ² − (D / 2−δ) ² } ^1/2 (2) In this formula, for example, Pressing load 10tf, core roll diameter 5
0 mm, belt thickness 10 mm, belt width 2000 m
Using m and Young's modulus of 0.25 Kg / mm ³ , the nip width of 30 mm can be obtained by substituting into the above equation to obtain the oblateness δ and then into the equation for obtaining the nip width. That is, it is possible to process a metal plate with the curvature of the core roll between the elastic belt and the core roll that are changed with a predetermined nip width depending on the curvature of the core roll. On the other hand, the pressing roll diameter is not involved in the bending of the metal plate, but a roll diameter that is sufficiently larger than the core roll is generally used as a roll diameter having rigidity that can exert a pressing load. Therefore, for example, a flat plate to which a pressure having an infinite curvature is applied may be moved.

Next, the production of the pipe with the above-mentioned bending roll will be described. The first pressing roll 2A and the second pressing roll 2B move from the state retracted from the core roll 1 in the arrow direction of FIG. 2A, and each pressing roll 2 moves so as to press against the core roll 1. (FIG.2 (b)). From this state, the metal plate 6 as a pipe material enters between the core roll 1 and the first pressing roll, and the metal plate 6 is roll-bent by the core roll and the pressing roll 2A (FIG. 2).
(C)). Next, when the tip of the metal plate 6 reaches the pressing roll 2B, the core roll 1 and the pressing roll 2B are again subjected to roll bending processing, and the core roll 1 is rotated almost once to complete the roll bending processing (FIG. 2). (D)). After that, rotation of each roll is stopped, and as shown in FIG.
By moving A, 2B and the tension roll 81 to loosen the guide belt 8 and rotating the pressing roll 2A in the direction of the arrow from the state where the pinch roll 21 is wound around the pressing roll 2A, the initial distance from the core roll 1 is increased. The state shown in FIG. Although FIG. 2 describes the manufacture of the pipe by the method of moving the upper and lower pressing rolls 2A and 2B with respect to the core roll 1 which does not move, the upper and lower pressing rolls 2
One of A (or 2B) may be fixed and the core roll 1 and the other pressing roll 2B (or 2A) may be moved. Then, by releasing the guide belt 8 as described above, the pipe-shaped metal plate 6 is extracted from the core roll 1 and the end portion is subjected to a welding process (not shown) to complete the product. As an example of extracting the metal plate 6 formed here, FIG.
As shown in (c), the chock portion 12 that supports the pivotal support portion 11 that pivotally supports the central shaft 10 on one side of the core roll 1 has the cylinder 1.
The mechanism is such that it can be opened and closed by a drive source such as 3 and the like, and the molded metal plate 6 is pulled out from the gap where the chock portion 12 is opened.

FIG. 3 shows a second embodiment in which three pressing rolls each having one pressing roller 2 above the core roller 1 and two pressing rollers 2 below are used. In the drawings, each pressing roll 2 is moved in the arrow direction by a pressing roll pressing device (not shown). In the example in which the three pressing rolls 2 are provided, the leading end of the metal plate 6 roll-rolled by the core roll 1 and the first pressing roll 2A is different from that in the first embodiment, and is relatively immediately next. The pressing roll 2B and the pressing roll 2C after the roll bending is performed by the core roll 1 and the second pressing roll 2B, the bending of the core roll 1 during winding is less likely to occur, and the metal plate 6
Since the tip of the metal plate 6 does not bend or break because it reaches the next pressing roll while the size of the core roll 1 separating from the core roll 1 is small, a smooth roll bending process can be performed. 4 is an explanatory view showing a state in which the pressing rolls 2A, 2B and 2C are separated from the core roll 1, and the metal plate 6 processed in this state is pulled out from the core roll 1. It should be noted that the greater the number of pressing rolls 2 is, the better the finish is. However, the use of five or more pressing rolls complicates the mounting structure of the pressing rolls, and the unit price of the rolls is not always low. 4 or less is preferable.

The embodiment shown in FIGS. 5 and 6 is a third embodiment in which a metal plate guide device is provided on the surface of the core roll 1 where there is no guide belt in the first embodiment. It is in the form of. The configuration of this metal plate guide device is based on a base 70 provided near the surface of the core roll 1 on the side where the guide belt 8 is not provided.
On the rail 71 of the guide member 7 to the surface of the core roll 1.
A moving mechanism 73 capable of advancing to a position where 2 is pressed and retracting to a position where there is no hindrance in taking out a processed product of the metal plate 6.
Is placed. For the guide body, it is preferable to use a resin material such as hard nylon so that the guide body does not get scratched when it comes into contact with the metal plate 6 or the core roll 1. Alternatively, it goes without saying that the guide body may be of a type using a guide roll. A known power source such as the motor 50 is used for the moving mechanism.

Next, in the third embodiment, the tension roll 81 is moved to apply the tension to the guide belt 8 to bring the pressing rolls 2A and 2B into close contact with the core roll 1 (FIG. 6 (a)). . Next, with the guide belt 8 wound around the core roll 1, the core roll 1 is driven to insert the metal plate 6. The metal plate 6 is bent around the core roll 1 and the pressing rolls 2A and 2B in the same manner as in the first embodiment described above. And is bent and formed (FIG. 6B). After that, the metal plate 6 that has come out of the pressing roll 2B is pressed against the surface of the core roll 1 by the metal plate guide device 7, and the state where it is pressed against the surface of the core roll 1 is maintained until the next pressing roll 2A. (FIG. 6C), the spring bag can be prevented. Finally, after the metal plate 6 is formed into a pipe shape, the tension roll 81 is loosened and moved to the position to release the pressing rolls 2A and 2B from the core roll 1,
When the metal plate guide device 7 is retracted, the belt is loosened and the pipe 6 can be taken out from the core roll 1 in the axial direction (FIG. 6 (d)).

In the embodiment shown in FIG. 7, a guide belt is provided with a guide band. That is, a convex guide strip 82 is provided on the side of the pressing roll of the guide belt 8. The groove 23 into which the guide band 82 is inserted is pressed into the pressing roll 2
It is provided in A and 2B. A similar groove 83 is also 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 is not scraped and is not excessively deformed. Therefore, the cylindrical molding accuracy can be improved.

The embodiment shown in FIGS. 8 to 9 has a core roll 1
Is a configuration example in which the guide belt 8 on the side in contact with the surface of the core belt 1 is provided with a cut 84 in the longitudinal direction of the core roll 1 and the bend radius of the guide belt can be reduced by the cut. As can be seen from the above formula (1), since the belt having a large thickness has a large flatness, the pressing force of the pressing rolls 2A and 2B can be effectively used for the deformation of the metal plate. Difficult to bend. Then, as described above, the core roll 1 is attached to the guide belt 8 on the side that contacts the surface of the core roll 1.
A notch 84 is provided in the longitudinal direction of the. Due to this cut, the length of the peripheral surface on the side of the core roll 1 is substantially shorter than that on the outside of the guide belt 8, and the guide belt can be easily bent along the outer peripheral surface of the core roll 1. When processing into a small-diameter metal cylinder, the pressing force of the pressing rolls 2A and 2B can be effectively used. Further, FIG. 10 similarly shows that when the guide belt 8 is used, the elastic belt is not wound directly around the core roll having a small diameter, but the elastic belt is the bending belt 8A used only for processing the metal plate 1, This bending belt 8A
The guide belt 8B that passes through the core roll 1 and the core roll 1 and that is synchronously driven with the core roll and that is thin and easy to bend and deform is interposed. In this embodiment, a bending belt is used to perform bending, and a guide belt 8B is used to prevent spring back of the metal plate and to perform bending with a small diameter. In the figure, 81a and 81b are tension rolls.

11 to 12 show an embodiment in which a winding belt is wound around a core roll for use. That is, a plurality of metal pressing rolls 2A and 2B that contact the upper and lower sides of the metal core roll 1 are provided. And one end is core roll 1
There is provided a winding belt 9 made of an elastic material, which is adhered and fixed to the surface of the sheet and the other end of which is fixed to the tension roll 90.
The winding belt 9 has a urethane rubber coating on the surface of a polyester or nylon fiber base material so that the winding belt 9 can be softly fit even when wound around a relatively hard core roll 1 as in the first embodiment. Core roll 1
A method is used in which the tip of the slit is inserted into the slit provided in and is fixed with an adhesive. The tension roll 90 is connected to the unwinding direction drive mechanism 92 with a brake that applies a constant tension in the winding direction and a torque limiter 91 that is connected when unwinding interposed therebetween. Here, the torque limiter 91 has, for example, a structure in which two frictional surfaces 91A and 91B which are pressed by a predetermined force and face each other are provided between the tension roll 90 and the shaft of the unwinding direction drive mechanism 92, and the frictional force A resistance torque due to
Then, when the unwinding drive mechanism 92 stops rotating, the friction surfaces 91A and 91B of the torque limiter 91 slip in the winding direction of the core roll 1 to apply tension to the winding belt 9 by resistance torque. Conversely, in the direction in which the winding belt 9 is unwound from the core roll 1, frictional surfaces 91A and 91B are connected because a small torque is required.

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 (see FIG.
2 (a)), the core roll 1 is rotated, and the pressing roll 2A,
Bend 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 it is wound into the roll by the resistance torque of the torque limiter 91. Is pulled with constant tension,
The metal plate 6 on the winding belt 9 is attached to each of the pressing rolls 2A and 2A.
At the position B, the processing is performed so as to surely follow the core roll 1 without floating (FIGS. 12B and 12C). After the bending process is completed, the pressing rolls 2A and 2B are attached to the core roll 1.
Then, the torque limiter 91 and the unwinding direction drive mechanism 92 are operated, and the winding belt 9 moves the tension roll 90.
12D, the metal plate 6 after bending is taken out from the core roll 1 in the state of FIG.

In this embodiment, after the metal plate 6 is bent by the core roll 1 and the pressing rolls 2A, 2B, the winding belt 9 is made of metal until the tail end of the metal plate 6 is wound around the core roll 1. Since the plate 6 is closely attached to the core roll 1,
The elastic recovery of the formed metal plate 6 is suppressed, and when the tip of the metal plate 6 passes between the core roll 1 and the plurality of pressing rolls 2A and 2B, it is fed with a desired curvature and is forcedly deformed. Since it does not exist, it is possible to improve the cylindrical molding accuracy.
Further, since the metal plate 6 is mounted on the winding belt 9 and the tip can be inserted into the core roll, it is not necessary to separately provide a mechanism for inserting the metal plate 6.

[0026]

EXAMPLE Now, in the apparatus of the embodiment shown in FIG. 1, the core roll 1 has a diameter of 85 mm and the pressing roll 2 has a diameter of 4 mm.
00 mm, the thickness of the elastic guide belt is 10 mm, the metal plate 6 used is made of mild steel and has a thickness of 0.8 mm and a width of 267 m.
m, length 2 m, core roll 1 is 540 mm / m
In, roll bending was performed with a pressing force of the pressing roll 2 of about 10 tf. The metal plate 6 after bending is
The outer diameter of the processed metal plate was about 115 mm, and the end portions could be molded substantially parallel to each other, and the barrel shape was not obtained.

[0027]

According to the bending roll of the present invention,
It has become possible to stably produce long pipes with small diameters that were previously impossible to form. In the present invention, since the bending of the core roll can be prevented in advance, the finished product is
So-called barrel-shaped deformation can be prevented and small diameter, long pipes can be molded. In the invention according to claim 4, by pressing the metal plate itself against the core roll, the metal plate can be processed with a constant curvature from the tip end to the tail end, and a pipe with a good finish can be manufactured. . Further, in the inventions according to the fifth to sixth aspects, it is possible to carry out the processing of a small diameter even by using a relatively hard elastic material belt.

[Brief description of drawings]

FIG. 1 is an explanatory view of a bending roll provided with two pressing rolls according to the present invention, (a) is a front view and (b) is a side view. (C) is a figure which shows the chock of the core roll 1 on the side which extracts the molded board.

FIG. 2 is an explanatory diagram showing an operating state of the bending roll according to FIG.

FIG. 3 is an explanatory view of a bending roll provided with three pressing rolls according to the present invention, (a) is a front view and (b) is a side view.

FIG. 4 is an explanatory view of a bending roll provided with four pressing rolls according to the present invention, (a) is a front view and (b) is a side view.

FIG. 5 is a perspective view showing an embodiment using a metal plate guide device according to the present invention.

FIG. 6 is an explanatory view showing an operating state of the bending roll according to FIG.

FIG. 7 is a perspective view showing an embodiment in which a guide belt is provided on the guide belt according to the first embodiment of the present invention.

FIG. 8 is a schematic view showing an embodiment in which a notch is provided in the guide belt according to the present invention.

9 is an enlarged cross-sectional explanatory view of the embodiment shown in FIG.

FIG. 10 is an explanatory view showing an embodiment using two belts of a bending belt and a guide belt according to the present invention.

FIG. 11 is a perspective view of an embodiment in which the winding belt according to the present invention is wound around a core roll and used.

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

FIG. 13 is a perspective view of a barrel-shaped pipe made by conventional roll bending.

[Explanation of symbols]

1 core roll 10 central axis 11 pivotal branch 12 Chock 13 cylinders 2 pressing roll 21, 22 pinch roll 3 frame 4 roll pressing device 40 support 41 motor 42 hanger 50 motor 6 metal plate 7 Metal plate guide device 70 base 71 rail 72 Guide body 73 Moving mechanism 8 guide belt 8A bending belt 8B guide belt 80 cylinders 81, 81a, 81b Tension roll 82 guide belt 83 groove 9 winding belt 90 tension rolls 91 Torque limiter 92 Unwinding direction drive mechanism

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kiyoji Uda             20-1 Shintomi, Futtsu-shi, Chiba Nippon Steel shares             Company Technology Development Division (72) Inventor Shizuo Kohinata             20-1 Shintomi, Futtsu-shi, Chiba Nippon Steel shares             Company Technology Development Division F-term (reference) 4E028 CA02                 4E063 AA01 BB04 BB10 JA03 JA07                       MA02

Claims (7)

[Claims] 1. An apparatus for manufacturing a pipe by pressing a roll against a core roll and feeding a metal plate to the contact portion to perform a bending process, wherein a core roll made of metal and a periphery of the core roll when the metal plate is bent. A plurality of pressing rolls made of metal, and interposed between each of the core roll and the plurality of pressing rolls,
Pass the core roll surface on the side opposite to the side to pull in the metal plate,
A bending roll comprising: a guide belt made of an elastic body that is synchronously driven with the core roll; 2. An apparatus for producing a pipe by pressing a roll against a core roll and feeding a metal plate to the contact portion to perform bending processing, wherein a core roll made of metal and the core roll is sandwiched when the metal plate is bent. Are placed in a straight line by contacting with each other, and are interposed between the pressing roll made of metal and the core roll and the pressing roll linearly arranged, and pass through the surface of the core roll on the side opposite to the side where the metal plate is drawn. And a guide belt made of an elastic body that is synchronously driven with the core roll, and a bending roll. 3. A portion for feeding and bending a metal plate,
The bending roll according to any one of claims 1 and 2, wherein a long and small core roll having a width 10 times or more the diameter is used. 4. When bending a metal plate, a moving mechanism that moves to a position where the metal plate is pressed against the surface of the core roll on the side where the metal plate is pulled in when the metal plate is moved forward, a guide body through which the metal plate surface easily slides, or The bending roll according to any one of claims 1 to 3, further comprising a metal plate guide device having a guide roller. 5. A guide belt made of an elastic body on the side contacting the surface of the core roll is provided with a notch in the longitudinal direction of the core roll, and the bend radius of the guide belt is reduced by the notch. Item 6. A bending roll according to any one of items 1 to 5. 6. An apparatus for manufacturing a pipe by pressing a roll against a core roll and feeding a metal plate to the contact portion to perform a bending process, wherein a core roll made of metal and a periphery of the core roll when the metal plate is bent. A plurality of pressing rolls made of metal, and interposed between each of the core roll and the plurality of pressing rolls,
A curved belt made of an elastic body that passes through the core roll side opposite to the side where the metal plate is drawn and that is driven synchronously with the core roll, and a guide belt that passes between the core roll and the curved belt and that is driven synchronously with the core roll Bending roll characterized by becoming. 7. A metal core roll, a plurality of pressing rolls contacting the core roll, and a winding belt made of an elastic body having one end adhered and fixed to the surface of the core roll and the other end fixed to a tension roll. The winding belt that winds around the core roll in synchronization with the rotation of the core roll is provided with a brake that applies constant tension in the winding direction, a torque limiter that connects the winding belt when unwinding, and a drive mechanism for unwinding direction to the tension roll. Bending roll to be.