JP5927008B2 - Tube straightening device and pipe straightening method - Google Patents

Description

  The present invention relates to a tube material correcting device and a tube material correcting method for correcting the roundness of a tube material.

  When the roundness of pipe materials used for pipelines and piles is not sufficiently ensured, there are cases where poor bonding and poor quality occur when joining such as welding or mechanical joining. Therefore, the roundness of various portions (axial regions) in the axial direction of the pipe material is increased in advance.

As an apparatus for increasing the roundness of a pipe material, for example, a correction apparatus described in Patent Document 1 is known.
The straightening device is arranged in the pipe line of the pipe material and is crushed in the axial direction of the pipe material by the first hydraulic cylinder arranged on the outer periphery of the end portion of the pipe material via the contact plate. Sometimes, it has an elastic body that bulges in the radial direction of the pipe material.
When the straightening device is used, first, a load is applied to the end portion of the pipe having a distorted shape by the first hydraulic cylinder, and the shape of the end portion is held in a perfect circle. The shape of the pipe is measured by a displacement meter connected to the abutment plate.

  Next, the elastic body is arranged in the pipe line and crushed in the axial direction of the pipe material by the second hydraulic cylinder to bulge the elastic body in the radial direction of the pipe material, and the stress in the circumferential direction of the pipe material is the yield stress. Adjust to 100-120%. Here, the load applied by the first hydraulic cylinder is released and the load applied by the second hydraulic cylinder is increased so that the circumferential stress of the pipe material becomes 110 to 200% of the yield stress. Adjust to. In this state, after holding for a certain time (for example, about 30 seconds), the load of the second hydraulic cylinder is reduced, and the correction of the pipe material is finished.

  By correcting the pipe material in this way, the peripheral stress in the circumferential direction of the pipe material is distributed almost evenly, so the end portion is corrected to a perfect circle.

Japanese Patent Publication No. 60-45013

  However, the correction device described in Patent Document 1 has a problem in that it takes a long time to correct because it goes through various procedures such as alternately operating and holding both hydraulic cylinders.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a pipe straightening device and a pipe straightening method that can correct the roundness of the axial region of the pipe in a short time. To do.

In order to solve the above problems, the present invention employs the following means.
That is, the pipe straightener of the invention of claim 1 is a pipe straightener that corrects the roundness of an axial region that is at least a part in the axial direction of the pipe, and has its inner peripheral surface formed in a circular shape. A ring-shaped casing that is disposed on the outer periphery of the pipe material so as to face the outer peripheral surface of the axial region of the tube material, and an inner peripheral surface of the tube material that is disposed on the inner peripheral surface of the tubular material with the outer peripheral surface thereof abutting on the inner peripheral surface of the axial region and the inner peripheral side rollers, by the action of pressure contact force between the outer peripheral surface of the inner peripheral surface and the tube of the casing, the inner peripheral surface of the casing as a correcting die surface, the inner peripheral surface of the casing axis region of the tube And a pressing means for plastically deforming the shape while advancing shape deformation, and a rotating means for relatively rotating the tube material and the inner peripheral roller around the axis of the tube material.

  Thereby, the axial area | region of a pipe material can be correct | amended by the circular shape along the inner peripheral surface of a casing. In this case, the plastic deformation generated in the pipe material is the same as that of rolling, and the compressive deformation in the thickness direction of the pipe material in the line contact region between the inner roller and the casing and the pipe material is determined by the volume constant law. Converted to stretch deformation in the direction. Elongation deformation in the circumferential direction is constrained by the shape of the inner peripheral surface of the casing in the deformation direction, and the shape deformation of the tube progresses following the shape of the inner peripheral surface of the casing. As a result, effective correction is performed.

  The pipe material straightening device of the invention of claim 2 is the pipe material straightening device according to claim 1, wherein the pressing means presses the inner peripheral side roller against the inner peripheral surface of the pipe material toward the casing, thereby the inner peripheral surface of the casing and the outer peripheral surface of the pipe material. A pressure contact force is applied between the two. Thereby, the cross-sectional shape of the tube material can be corrected by the action of the pressing means that applies a pressing force to the inner peripheral side roller.

  According to a third aspect of the present invention, there is provided the pipe material correcting device according to the second aspect, wherein the rotating means applies a driving force for rotating the pipe material around its axis to the pipe material via the casing. Thereby, since the outer diameter of a casing becomes larger than the outer diameter of a pipe material, a big torque can be easily made to act on a pipe material.

  According to a fourth aspect of the present invention, there is provided the pipe material correcting device according to the third aspect, wherein the rotating means has its own rotation axis parallel to the casing axis, the outer peripheral surface abuts on the outer peripheral surface of the casing, It has an outer peripheral side roller arrange | positioned at the radial direction outer side of a casing, and a roller drive motor which rotates an outer peripheral side roller around the rotating shaft line. As a result, the pipe material is deformed by being sandwiched in the radial direction of the casing by the inner peripheral roller and the outer peripheral roller via the casing, so that even when the correction load is large, the deformation of the casing can be suppressed and the pipe material can be corrected with high accuracy. .

  According to a fifth aspect of the present invention, there is provided the pipe material correcting device according to the third aspect, wherein the rotating means has its own rotation axis parallel to the casing axis, the outer peripheral surface abuts on the outer peripheral surface of the casing, A pair of outer peripheral rollers disposed with their positions shifted from the outer side in the radial direction of the casing to the opposite sides of the circumferential direction of the casing, and rollers that rotate the pair of outer peripheral rollers in the same direction around their respective rotation axes And a drive motor. Thereby, it can support reliably so that a casing may be pinched | interposed between a pair of outer peripheral side rollers, and the relative rotational force of a pipe material and an inner peripheral side roller can be heightened.

  According to a sixth aspect of the present invention, there is provided the pipe straightening device according to the fourth or fifth aspect, wherein the rotating means has its own rotation axis parallel to the casing axis and the outer peripheral surface abuts the outer peripheral surface of the casing. A guide roller for guiding the peripheral side roller so as to rotate relatively around the axis of the tube material is provided separately from the outer peripheral side roller. Thereby, the relative rotation of a pipe material and an inner peripheral side roller can be stabilized more.

  According to a seventh aspect of the present invention, there is provided the pipe material straightening device according to the fourth or fifth aspect, wherein the inner peripheral side roller and the outer peripheral side roller are rotatably supported around their respective rotation axes, and the pressing means and the roller drive motor are attached. It is provided with a stand. Thus, for example, by arranging the machine base on a horizontal plane, the roundness of the axial region is corrected while rotating the tube material on which the casing is arranged around the axis line in a state where the position of the inner peripheral roller is fixed. can do.

  According to an eighth aspect of the present invention, there is provided the pipe material correcting device according to the second aspect, wherein the rotating means applies a driving force for rotating the pipe material about its axis to the pipe material via the inner peripheral side roller. Thus, the driving force can be directly applied to the pipe material by the inner peripheral side roller, whereby the pipe material can be rotated more reliably around the axis.

  According to a ninth aspect of the present invention, there is provided the pipe material straightening device according to any one of the first to eighth aspects, wherein a plurality of inner peripheral rollers are provided with the axis of the pipe material as a symmetrical axis. Thereby, the axial area | region of a pipe material can be correct | amended in the shape near circular in a shorter time.

  According to a tenth aspect of the present invention, in the pipe straightening device according to the first aspect, the pressing means presses the casing against the outer peripheral surface of the pipe toward the inner peripheral side roller, whereby the inner peripheral surface of the casing and the outer peripheral surface of the pipe A pressure contact force is applied between them. Thereby, a pipe material can be corrected by the effect | action of the press means which gives a pressing force to a casing.

  According to an eleventh aspect of the present invention, there is provided the pipe material straightening device according to the tenth aspect, wherein the rotating means applies a driving force for rotating the pipe material around its axis to the pipe material via the casing. Thereby, since the outer diameter of a casing becomes larger than the outer diameter of a pipe material, a big torque can be easily made to act on a pipe material.

  According to a twelfth aspect of the present invention, there is provided the pipe material correcting device according to the eleventh aspect, wherein the rotation means has its own rotation axis parallel to the casing axis, the outer peripheral surface abuts on the outer peripheral surface of the casing, and It has an outer peripheral side roller arrange | positioned at the radial direction outer side of a casing, and a roller drive motor which rotates an outer peripheral side roller around the rotating shaft line. As a result, the pipe material is deformed by being sandwiched in the radial direction of the casing by the inner peripheral roller and the outer peripheral roller via the casing, so that even when the correction load is large, the deformation of the casing can be suppressed and the pipe material can be corrected with high accuracy. .

  According to a thirteenth aspect of the present invention, in the twelfth aspect, the pressing means presses the casing against the outer peripheral surface of the pipe member toward the inner peripheral side roller via the outer peripheral side roller. This simplifies the configuration.

  According to a fourteenth aspect of the present invention, in the twelfth or thirteenth aspect of the present invention, in the twelfth or thirteenth aspect, the rotating means has its own rotation axis parallel to the casing axis and the outer peripheral surface abuts on the outer peripheral surface of the casing. A guide roller for guiding the peripheral side roller so as to rotate relatively around the axis of the tube material is provided separately from the outer peripheral side roller. Thereby, the relative rotation of a pipe material and an inner peripheral side roller can be stabilized more.

  According to a fifteenth aspect of the present invention, there is provided the pipe straightening device according to any one of the first to fourteenth aspects, further comprising constant pressure control means for controlling the pressing force by the pressing means to a constant pressure regardless of a change in the thickness of the pipe material. . This stabilizes the load required for plastic deformation and improves the shaping accuracy.

  According to a sixteenth aspect of the present invention, in any one of the first to fifteenth aspects, the casing can be divided into a plurality of parts in the circumferential direction. As a result, the casing can be easily arranged at any position in the axial direction of the pipe material.

  The pipe material correcting device of the invention of claim 17 is the pipe material correcting device according to claim 16, wherein the casing is divided into a plurality of divided pieces in the circumferential direction, and a positioning pin is passed through an overlapping piece provided at an end of an adjacent divided piece. Adjacent divided pieces are connected to each other, thereby forming a casing having a fixed diameter, and by separating the positioning pins, the divided pieces are slidably supported by a predetermined range in the circumferential direction. The slide mechanism is provided between the overlapping pieces of adjacent divided pieces.

The pipe straightening method of the invention of claim 18 is a pipe straightening method for correcting roundness of an axial region which is at least a part in the axial direction of the pipe, wherein the inner peripheral surface is formed in a circular shape. The casing is disposed on the outer periphery of the pipe material with the inner peripheral surface of the tube member facing the outer peripheral surface of the shaft region, and the inner peripheral roller is disposed on the inner periphery of the pipe member by bringing the outer peripheral surface into contact with the inner peripheral surface of the shaft region of the tube material. By placing and applying a pressure contact force between the inner peripheral surface of the casing and the outer peripheral surface of the tube, the axial surface of the tube follows the shape of the inner peripheral surface of the casing with the inner peripheral surface of the casing as a straightened mold surface. while advancing the deformation with plastic deformation, it characterized by relatively rotating the inner peripheral side roller and the tubing around the axis of the tube.

  Thereby, the axial area | region of a pipe material can be correct | amended by the circular shape along the inner peripheral surface of a casing. In this case, the plastic deformation generated in the pipe material is the same as that of rolling, and the compressive deformation in the thickness direction of the pipe material in the line contact region between the inner roller and the casing and the pipe material is determined by the volume constant law. Converted to stretch deformation in the direction. Elongation deformation in the circumferential direction is constrained by the shape of the inner peripheral surface of the casing in the deformation direction, and the shape deformation of the tube progresses following the shape of the inner peripheral surface of the casing. As a result, effective correction is performed.

  According to a nineteenth aspect of the present invention, there is provided a method for correcting a pipe material, wherein the axial region is changed by relatively moving the pipe material, the casing, and the inner peripheral side roller in the axial direction. Thereby, the shaping width can be expanded.

  According to invention of Claim 1, the axial area | region of a pipe material can be corrected in a short time by the mechanism similar to rolling.

  According to invention of Claim 2, the cross-sectional shape of a pipe material can be correct | amended appropriately by the effect | action of the press means which gives a pressing force to an inner peripheral side roller.

  According to invention of Claim 3, a big torque can be easily made to act on a pipe material.

  According to the invention of claim 4, even when the straightening load is large, the deformation of the casing can be suppressed and the pipe can be straightened with high accuracy.

  According to invention of Claim 5, the relative rotational force of a pipe material and an inner peripheral side roller can be raised.

  According to the sixth aspect of the present invention, the relative rotation between the tube material and the inner peripheral side roller can be further stabilized.

  According to the seventh aspect of the present invention, by arranging the machine base on a horizontal plane, the axial region is secured while rotating the pipe member on which the casing is disposed around the axis line in a state where the position of the inner peripheral roller is fixed. Circularity can be corrected.

  According to the eighth aspect of the present invention, the tube material can be rotated more reliably around its axis by causing the inner peripheral side roller to directly apply the driving force to the tube material.

  According to invention of Claim 9, the axial area | region of a pipe material can be correct | amended in the shape close | similar to circular in a shorter time.

  According to the invention of claim 10, the pipe material can be corrected by the action of the pressing means for applying a pressing force to the casing.

  According to the invention of claim 11, a large torque can be easily applied to the pipe material.

  According to the invention of claim 12, even when the straightening load is large, the deformation of the casing can be suppressed and the pipe can be straightened with high accuracy.

  According to the invention of claim 13, the configuration can be simplified.

  According to the fourteenth aspect of the present invention, the relative rotation between the tube material and the inner peripheral side roller can be further stabilized.

  According to the fifteenth aspect of the present invention, the load required for plastic deformation is stabilized and the shaping accuracy can be improved.

  According to the invention of claim 16, the casing can be easily arranged at any position in the axial direction of the pipe material.

  According to the invention of claim 17, by sliding the divided pieces without completely separating the casing, the diameter of the casing can be enlarged and the position can be adjusted, and the mounting property of the casing is improved.

  According to invention of Claim 18, the axial area | region of a pipe material can be corrected in a short time by the mechanism similar to rolling.

  According to the invention of claim 19, the shaping width can be enlarged.

It is the side view which fractured | ruptured some pipe material correction apparatuses of 1st Embodiment of this invention. It is sectional drawing of cutting line A1-A1 in FIG. It is a flowchart explaining the pipe material correction method of 1st Embodiment of this invention. It is a perspective view which shows the example (a) and (b) of the pipe material corrected by the same pipe material correction method. It is side surface sectional drawing explaining the fixing tool attachment process in the same pipe material correction method. It is front sectional drawing of the pipe material correction apparatus in the modification of 1st Embodiment of this invention. It is side surface sectional drawing of the pipe material correction apparatus in the modification of 1st Embodiment of this invention. It is front sectional drawing of the pipe material correction apparatus in the modification of 1st Embodiment of this invention. It is side surface sectional drawing of the pipe material correction apparatus of 2nd Embodiment of this invention. FIG. 10 is a cross-sectional view taken along section line A2-A2 in FIG. It is side surface sectional drawing of the pipe material correction apparatus in the modification of 2nd Embodiment of this invention. It is a front view of the pipe material correction apparatus of 3rd Embodiment of this invention. It is a front view which shows the principle structure of the pipe material correction apparatus of 4th Embodiment of this invention. It is a side view of the same pipe material correction apparatus. It is a side view of the pipe material correction apparatus in the modification of 4th Embodiment of this invention. It is a block diagram of the casing used for the pipe material correction apparatus of 5th Embodiment of this invention, (a) is a perspective view of an assembly state, (b) is a principal part perspective view of the slide mechanism of the division | segmentation piece which comprises a casing, (C) is a principal part perspective view which shows the state which separated the adjacent division piece. It is a figure which shows the correction result of the pipe material by the pipe material correction apparatus of this invention.

Hereinafter, a first embodiment of a pipe material straightening device according to the present invention will be described with reference to FIGS. 1 to 8.
As shown in FIGS. 1 and 2, the main pipe straightening device 1 is a device that corrects the roundness of the pipe T. In this specification, the roundness means a difference between the maximum outer diameter and the minimum outer diameter in a cross section of the pipe material. And correcting the roundness means correcting the tube so that the roundness approaches zero. The closer the roundness is to zero, the closer the cross-sectional shape of the pipe material is to a perfect circle.

Below, the main pipe material correction apparatus 1 demonstrates as an example the case where the one end part (axis area | region) T1 in the axis line C1 direction in the pipe material T is corrected.
The tubular material straightening device 1 according to the present embodiment has a ring 11 and an inner peripheral surface 11a attached to the outer peripheral surface of one end T1 of the tube T, and an outer peripheral surface on the inner peripheral surface of the one end T1 of the tube T. An inner peripheral roller 12 that abuts, a hydraulic jack (pressing means) 13 that presses the inner peripheral roller 12 against the inner peripheral surface of one end T1, and a pipe T attached to the casing 11 with respect to the inner peripheral roller 12. And rotating means 15 for rotating. The axis C1 of the tube T, the axis C2 of the casing 11, and the axis C3 of the inner peripheral roller 12 are all set to face the horizontal direction, and the inner peripheral roller 12 is disposed on the inner periphery of the lower end portion of the tube T. ing.

  The inner peripheral surface 11a of the casing 11 is formed in a perfect circle or a substantially true circle when viewed in parallel to the direction of the axis C2 of the casing 11. The casing 11 is made of a metal such as steel. Note that the rigidity of the casing 11 is preferably sufficiently higher than the rigidity of the tube material T. The casing 11 is attached so as to be coaxial with or parallel to the one end T1 of the tube material T.

  The inner diameter of the casing 11 is set to be slightly smaller than the outer diameter of the tube material T, and the tube material T is caulked when the casing 11 is attached to the tube material T. That is, the casing 11 is tightly adhered to the one end T1. Preferably it is attached. However, the inner diameter of the casing 11 does not necessarily have to be set smaller than the outer diameter of the tube material T, and may have a slight gap in a portion other than the weighted portion between the casing 11 and the tube material T.

  The pipe material straightening device 1 includes a machine base 21 formed in a plate shape. The machine base 21 is disposed on the horizontal plane G. A support base 22 is fixed to the upper surface of the machine base 21, and the above-described hydraulic jack 13 is attached to the lower surface of the top plate 23 of the support base 22. The hydraulic jack 13 has a main body 13a and a piston 13b, and the main body 13a can move the piston 13b in a vertical direction Z that is a direction orthogonal to the axis C1 of the pipe T by hydraulic pressure. The output of the hydraulic jack 13 is set so that the inner peripheral roller 12 is pressed against the inner peripheral surface of the one end portion T1 of the tube material T so that the one end portion T1 can be plastically deformed.

  In this embodiment, the inner peripheral roller 12 is formed in a substantially cylindrical shape. The inner peripheral roller 12 is attached to the tip of the piston 13b so as to be rotatable about its own central axis C3. The inner peripheral roller 12 is disposed in the pipe line of the pipe T so that the central axis C3 is parallel to the axis C1 of the pipe T and the outer peripheral surface is in contact with the inner peripheral surface of one end T1 of the pipe T. Yes. The outer diameter of the inner peripheral roller 12 is set to be smaller than the inner diameter of the tube material T. The inner peripheral roller 12 is configured by providing a protective layer on the surface of steel or the like, for example.

  The rotating means 15 includes an outer peripheral roller 16 whose outer peripheral surface is in contact with the outer peripheral surface of the casing 11, a roller drive motor 17 that rotates the outer peripheral roller 16 about its central axis C4, and a tube T that rotates about the axis C1. And a pair of guide rollers 18 for guiding.

  As shown in FIG. 1, the outer peripheral roller 16 is arranged so that the center axis C4 is parallel to the axis C2 of the casing 11, and is rotated around the center axis C4 by a turntable 24 fixed to the upper surface of the machine base 21. Supported as possible. As shown in FIG. 2, the outer peripheral side roller 16 is disposed on the radially outer side of a portion of the casing 11 adjacent to the inner peripheral side roller 12.

  Hereinafter, the radial direction of the casing 11 is simply referred to as “radial direction”, and the circumferential direction of the casing 11 is simply referred to as “circumferential direction”. In the present embodiment, the outer peripheral roller 16 is disposed vertically below the inner peripheral roller 12, and the casing 11 and the pipe material T are sandwiched between the outer peripheral roller 16 and the inner peripheral roller 12. As shown in FIG. 1, the roller drive motor 17 is attached to the upper surface of the machine base 21.

  Thus, in the present embodiment, the rotating means 15 is configured to apply a driving force for rotating the tube material T about the axis C1 of the tube material T to the tube material T via the casing 11.

  Each guide roller 18 is arranged such that its own central axis C5 is parallel to the axis C2 of the casing 11 and the outer peripheral surface abuts on the outer peripheral surface of the casing 11. The guide roller 18 has a difference between the distance from the axis C2 of the casing 11 to the center axis C4 of the outer roller 16 and the distance from the center axis C5 of the guide roller 18 to the radius of the outer roller 16 and the guide roller 18. It is arrange | positioned so that it may become equal to the difference with the radius of. The guide roller 18 is supported by a turntable 25 fixed on the upper surface of the machine base 21 so as to be rotatable around the central axis C5. Each of the outer peripheral side roller 16 and the guide roller 18 is formed in a substantially cylindrical shape with metal or hard resin.

Next, the pipe material straightening method of the present embodiment will be described in the case where one end portion T1 of the pipe material T is straightened using the pipe straightening device 1.
As shown in FIG. 3, in the present pipe material correcting method, the fixture T mounting step S <b> 1 for attaching the casing 11 to one end T <b> 1 of the pipe T, and the shape of the pipe T by rotating the pipe T with respect to the inner peripheral roller 12. And a pipe straightening step S2 for straightening.

  For example, as shown in FIG. 4 (a), the tube material T corrected by the present pipe material correcting method has a deformation T2 such as a local concave portion or convex portion at one end T1, or FIG. 4 (b). As shown in FIG. 2, the cross-sectional shape of the entire one end portion T1 is a non-circular shape such as an ellipse, and the roundness is low.

  First, in the fixture attaching step S1, the casing 11 is attached to the outer peripheral surface of the one end T1 of the tube material T as shown in FIG. At this time, the casing 11 having an inner diameter slightly smaller than the outer diameter of the tube material T is selected. In order to cope with various pipe materials, it is preferable to provide casings with various specifications having different inner diameters.

  Subsequently, in a state where the inner peripheral roller 12 is moved upward by the hydraulic jack 13, the tube material T to which the casing 11 is attached is moved, and the outer peripheral surface of the outer peripheral roller 16 and the pair of guide rollers 18 is moved to the outer periphery of the casing 11. While being brought into contact with the respective surfaces, the inner peripheral side roller 12 is disposed in the pipe line of the pipe material T. Then, the inner peripheral roller 12 is moved downward by the hydraulic jack 13 and the inner peripheral roller 12 is pressed against the inner peripheral surface of the one end T1 of the tube T, whereby the outer peripheral surface of the pipe T and the inner peripheral surface of the casing 11 are pressed. A pressure contact force is applied to the end portion T1, thereby plastically deforming one end portion T1 of the tube material T with the inner peripheral surface of the casing 11 as a correction mold surface. At the same time, the roller drive motor 17 is operated to rotate the tube material T around the axis C <b> 1 of the tube material T with respect to the inner roller 12. At this time, the central axis C3 of the inner peripheral roller 12 is parallel to the axis C1 of the tube material T.

  In this way, by correcting with the inner peripheral side roller 12 over the entire inner peripheral surface of the one end portion T1, the degree of deformation of the deformable portion T2 is reduced or the elliptical shape is corrected, and the roundness of the tube T Is corrected. If correction is insufficient even when the tube T is rotated once around the axis C1, the roundness of the tube T can be further improved by repeatedly rotating the tube T around the axis C1. . In this case, the plastic deformation generated in the tube T is caused by the same mechanism as rolling, and the radial compression deformation in the line contact region between the inner peripheral roller 12 and the casing 11 and the tube T is circumferential according to the constant volume rule. Converted to stretch deformation to. Elongation deformation in the circumferential direction is constrained by the inner peripheral surface 11a of the casing 11 in the deformation direction, and the shape deformation of the tube material T proceeds in accordance with the shape of the inner peripheral surface 11a of the casing 11. . As a result, effective correction is performed.

As described above, according to the pipe material straightening device 1 and the pipe straightening method of the present embodiment, the casing 11 supports the outer circumferential surface of the one end T1 of the pipe T while the inner circumferential roller 12 is moved to the inner circumference of the one end T1. The tube material T is rotated around the axis C1 relative to the inner peripheral side roller 12 while being pressed against the surface and plastically deforming the one end portion T1. For this reason, the one end T1 of the tube material T can be corrected to a perfect circle shape along the inner peripheral surface 11a of the casing 11.
In addition, since the tube material T is corrected by rotating the tube material T around the axis C1 while applying a pressure contact force between the casing 11 and the tube material T, compared with the conventional correction device described in Patent Document 1. The roundness of the pipe can be corrected in a short time.

  The rotating means 15 is configured to apply a driving force for rotating the tube material T about the axis C <b> 1 to the tube material T via the casing 11. Since the outer diameter of the casing 11 is larger than the outer diameter of the tube material T, a large torque can be easily applied to the tube material T.

  The rotating unit 15 includes an outer peripheral side roller 16 and a roller driving motor 17. Even when the straightening load is large, the tubular material T is deformed by sandwiching the tubular material T between the inner peripheral roller 12 and the outer peripheral roller 16 in the radial direction via the casing 11, so that the deformation of the casing 11 can be suppressed and the tubular material T can be accurately corrected. Can do.

  Since the rotation means 15 includes the guide roller 18, the tube material T can be rotated more stably around the axis C <b> 1 of the tube material T with respect to the inner circumferential side roller 12. Since the pipe straightening device 1 includes the machine base 21, the pipe 21 to which the casing 11 is attached is moved around the axis C1 in a state where the position of the inner peripheral roller 12 is fixed by arranging the machine base 21 on the horizontal plane G. The roundness of the one end portion T1 of the tube material T can be corrected while rotating the tube material T. Further, by setting the rigidity of the casing 11 sufficiently higher than the rigidity of the tube material T, the tube material T is uniformly corrected along the inner peripheral surface 11a of the casing 11 regardless of the initial residual stress or deformation of the tube material T. be able to.

  In addition, in this embodiment, the structure of the pipe material correction apparatus 1 can be changed variously so that it may demonstrate below.

  For example, as in the tube material correcting device 2 shown in FIG. 6, the inner peripheral roller 12 may be configured to have a plurality (two in this modification) with the axis C1 of the tube T as the axis of symmetry. In this modification, a hydraulic jack 13 that presses the inner peripheral roller 12 against the inner peripheral surface of the one end T1 is provided for each inner peripheral roller 12. By configuring the tube straightening device 2 in this way, the one end portion T1 can be corrected to a shape close to a circle in a shorter time.

  Further, as in the tube material straightening device 3 shown in FIG. 7, a rotation unit 31 may be provided instead of the rotation unit 15 in the tube material straightening device 1 of the first embodiment. The rotating means 31 includes a roller driving motor 32 that rotates the inner peripheral roller 12 about the central axis C3. The rotating means 31 of this modification is configured to apply a driving force for rotating the tube material T around the axis C <b> 1 to the tube material T via the inner peripheral side roller 12. By configuring the tube material correcting device 3 in this way, the tube material T can be rotated around the axis C1 of the tube material T with respect to the inner circumferential side roller 12. By directly applying a driving force to the tube material T by the inner circumferential side roller 12, for example, even when there is a gap between the tube material T and the casing 11, the tube material T is reliably rotated around the axis C1. Can do.

  In addition, the tube material correction apparatus 1 may further include a roller drive motor 32 so that the tube material T may be rotated by both the inner peripheral roller 12 and the outer peripheral roller 16.

  As in the tube material straightening device 4 shown in FIG. 8, in the tube material straightening device 1, the outer peripheral roller 16 is disposed on one circumferential side below the inner circumferential roller 12, and one guide is provided on the other circumferential side. A roller 18 may be disposed. By configuring the tube straightening device 4 in this way, the inner peripheral roller 12 can be stably supported from below by one inner peripheral roller 12 and one guide roller 18.

  In the first embodiment and its modifications, the guide roller 18 is not an essential component. This is because the tube material T to which the casing 11 is attached may be stably supported only by the inner peripheral side roller 12 and the guide roller 18.

  Next, a second embodiment of the present invention will be described with reference to FIGS. 9 to 11. However, the same parts as those of the above embodiment are denoted by the same reference numerals, and the description thereof will be omitted, and only differences will be described. explain.

  As shown in FIGS. 9 and 10, the tube straightening device 5 of the present embodiment is configured such that the inner peripheral roller 12 rotates around the axis C <b> 1 of the tube T with the tube T fixed. The main pipe straightening device 5 is not provided with the machine base 21 in the pipe straightening device 1 of the first embodiment, and includes a rotating means 41 instead of the rotating means 15.

  The rotating means 41 includes a pair of outer peripheral rollers 16 disposed so that the central axis C4 is parallel to the axis C2 of the casing 11 and the outer peripheral surface is in contact with the outer peripheral surface of the casing 11, and the pair of outer peripheral rollers 16 Are driven in the same direction around the central axis C4. As shown in FIG. 10, the pair of outer peripheral rollers 16 are positioned on the opposite sides of the circumferential direction from the radially outer side of the portion of the casing 11 adjacent to the inner peripheral roller 12 with respect to the inner peripheral roller 12. They are arranged by shifting.

  In the present embodiment, the roller drive motor 17 is attached to the turntable 24, and the turntable 24 is further fixed to the support table 22. Then, the inner peripheral roller 12, the hydraulic jack 13, the pair of outer peripheral rollers 16 and the roller drive motor 17 integrated with the support base 22 drive the roller drive motor 17, so that the axis T 1 of the tube T is rotated around the axis C 1. Rotate.

  According to the tube straightening device 5 of the present embodiment configured as described above, the roundness of the one end T1 of the tube T can be corrected with a simple configuration. Furthermore, by providing the pair of outer peripheral side rollers 16, it is possible to reliably support the casing 11 between the outer peripheral side rollers 16 and to increase the rotational force of the inner peripheral side roller 12 with respect to the tube material T.

  Even when the tube material T cannot be rotated about the axis C1, such as when the outer diameter of the tube material T is large, the one end T1 of the tube material T is corrected by rotating the inner peripheral roller 12 about the axis C1. It can be performed.

  In this embodiment, as in the tube material straightening device 6 shown in FIG. 11, the rotation device 31, that is, the roller drive motor 32 may be provided instead of the rotation device 41 of the tube material straightening device 5. By configuring the tube straightening device 6 in this way, the roller drive motor 32 is driven to rotate the inner peripheral roller 12 about the central axis C3, so that the inner peripheral roller 12 is moved to the axis C1 with respect to the tube T. Can be rotated around.

  The tube straightening device 5 of this embodiment may further include a roller drive motor 32 so that both the inner peripheral roller 12 and the outer peripheral roller 16 rotate with respect to the tube T.

  Next, a third embodiment of the present invention will be described with reference to FIG. 12, but the same parts as those of the above-described embodiment will be denoted by the same reference numerals, description thereof will be omitted, and only different points will be described.

  The pipe material correcting device 7 of this embodiment includes the casing 11, the three inner peripheral rollers 12, the pressing means 51 for urging each inner peripheral roller 12 radially outward, and a rotating means (not shown). And.

  The pressing means 51 includes a main body portion 52 disposed on the axis C1 at one end T1 of the tube T, and three support members disposed at equal angles in the circumferential direction around the axis C1 on the radially outer side with respect to the main body portion 52. 53 and three spring members 54 that connect the respective support members 53 and the main body 52.

  Each support member 53 supports the inner peripheral roller 12 so as to be rotatable about the central axis C <b> 3 of the inner peripheral roller 12. The spring member 54 urges the inner peripheral roller 12 radially outward while the inner peripheral roller 12 is in contact with the inner peripheral surface of the one end T1, and plastically deforms the one end T1. It has been adjusted. That is, the stress applied to the one end T1 by the spring member 54 when the inner peripheral roller 12 is brought into contact with the inner peripheral surface of the one end T1 is set to be equal to or higher than the yield stress of the material forming the tube T. Yes. The rotating means rotates the respective inner peripheral side rollers 12 around the central axis C3 in the same direction.

  When the tube straightening device 7 of the present embodiment configured as described above corrects one end T1 of the tube T, first, in the fixture mounting step S1, one end of the tube T is formed as in the first embodiment. The casing 11 is attached to the outer peripheral surface of the part T1.

  Subsequently, in the pipe material correcting step S2, the inner peripheral roller 12, the support member 53, and the spring member 54 that are integrated with the main body 52 are disposed in the pipe line of the one end T1. Then, the inner circumferential roller 12 is urged radially outward by the spring member 54 to plastically deform the one end T1, and the respective inner circumferential rollers 12 are rotated by the rotating means. Correct the roundness of T1.

Next, a fourth embodiment of the present invention will be described with reference to FIGS.
In the first to third embodiments, the inner peripheral roller is pressed against the inner peripheral surface of the tube T by the hydraulic jack 13, so that the pressure contact force is generated between the outer peripheral surface of the tube T and the inner peripheral surface of the casing 11. As shown in FIG. 13, in the pipe material straightening device 101 of the fourth embodiment, the casing 11 is moved by applying an upward pressing force to the outer peripheral side roller 116 by the hydraulic jack 113. The tube is pressed against the outer peripheral surface of the tube T toward the inner peripheral roller 112. Therefore, the outer peripheral roller 116 can move up and down, and the inner peripheral roller 112 is fixed in position.

Below, the main pipe material correction apparatus 1 demonstrates as an example the case where the one end part (axis area | region) T1 in the axis line C1 direction in the pipe material T is corrected.
As shown in FIG. 13, the pipe straightening device 101 of the present embodiment is arranged on the outer circumference of the pipe material T with its inner circumferential surface 11 a formed in a circle facing the outer circumferential surface of one end T <b> 1 of the pipe T. A ring-shaped casing 11 that is disposed, an inner peripheral roller 112 that is disposed on the inner periphery of the tube T with the outer peripheral surface being in contact with the inner peripheral surface of the one end T1 of the tube T, and an outer peripheral surface of the casing 11 An outer peripheral roller 116 that abuts to apply a rotational force to the casing 11 and applies an upward pressing force, a roller drive motor 114 that rotationally drives the outer peripheral roller 116, and an outer peripheral surface of the casing 11 11 and a pair of guide rollers 118 that guide the rotation of the casing 11, and a hydraulic jack (pressing means) 113 that applies an upward pressing force to the outer peripheral side roller 116. There. The outer peripheral side roller 116, the roller driving motor 114, and the guide roller 118 constitute a rotating means 115 that relatively rotates the tube T and the inner peripheral roller 112 around the axis C1 of the tube T.

  Here, as shown in FIGS. 13 and 14, the axis C1 of the pipe T, the axis C2 of the casing 11, the axis C3 of the inner roller 112, and the axis C4 of the outer roller 116 are all parallel to each other and in the horizontal direction. The inner peripheral roller 112 is disposed on the inner periphery of the lower end portion of the tube material T, and the outer peripheral roller 116 is disposed vertically below the inner peripheral roller 112.

  The inner peripheral surface 11a of the casing 11 is formed in a perfect circle or a substantially true circle when viewed in parallel to the direction of the axis C2 of the casing 11. The casing 11 is made of a metal such as steel. Note that the rigidity of the casing 11 is preferably sufficiently higher than the rigidity of the tube material T.

  The inner diameter of the casing 11 is set to be slightly larger than the outer diameter of the tube material T. When the casing 11 is arranged on the outer periphery of the tube material T and the casing 11 is supported by the outer peripheral side roller 116, The inner diameter of the casing 11 is set such that there is a slight gap between the inner periphery and the outer periphery of the upper end portion of the tube material T.

  As shown in FIG. 14, the pipe material correction device 101 includes a machine base 121. The machine base 121 includes traveling wheels 151 for movement, and is disposed on the horizontal plane G. A support base 122 is erected on the upper surface of the machine base 121, and a base portion of the support shaft 140 that supports the inner peripheral roller 112 is fixed to the support base 122 with the axis line oriented horizontally. An inner peripheral side roller 112 formed in a substantially cylindrical shape is attached to the outer periphery of the small-diameter portion 141 at the tip through a bearing 142 so as to be rotatable around its own central axis C3. In addition, the outer diameter of the inner peripheral side roller 112 is set to be smaller than the inner diameter of the tube material T, and the inner peripheral side roller 112 is configured, for example, by providing a protective layer on the surface of steel or the like. .

  The machine base 121 is provided with a fixed frame 123, and a vertical movement frame 124 that supports the outer peripheral roller 116 is supported on the fixed frame 123 so as to be slidable in the vertical direction. The vertical movement frame 124 is moved up and down by a hydraulic jack 113 disposed below the vertical movement frame 124, and a support shaft that rotatably supports the outer peripheral roller 116 via a bearing 126 on the vertical movement frame 124. 125 is fixed.

  A gear 127 is attached to the outer peripheral side roller 116 so as to be able to rotate integrally with the outer peripheral side roller 116, and the driven shaft is rotatably supported by the vertical movement frame 124 via a bearing 131. 130 is engaged with a gear 132 that rotates integrally with the gear 130. The driven shaft 130 is connected to a driving shaft of a roller driving motor 114 fixed to the machine base 121 via a rotary joint 119, and the rotation of the roller driving motor 114 is caused to move up and down the vertical movement frame 124. Regardless, the rotation transmitted to the driven shaft 130 via the rotary joint 119 and the rotation transmitted to the driven shaft 130 is transmitted to the outer peripheral roller 116 via the gear 132 and the gear 127. Further, the pressing force in the vertical direction Z transmitted to the vertical movement frame 124 by the hydraulic jack 113 is transmitted to the outer peripheral roller 116 via the support shaft 125 and the bearing 126.

  The hydraulic jack 113 presses the casing 11 against the outer peripheral surface of the one end portion T1 of the pipe member T via the outer peripheral side roller 116 so that a pressure contact force acts between the inner peripheral surface 11a of the casing 11 and the outer peripheral surface of the pipe member T. Thus, the output is set so that the one end portion T1 of the tube material T can be plastically deformed by using the inner peripheral surface 11a of the casing 11 as a straightening surface. In the middle of the hydraulic pressure supply path of the hydraulic jack 113, as shown in FIG. 13, an accumulator as a constant pressure control means for controlling the pressing force of the hydraulic jack 113 against the casing 11 to a constant pressure regardless of the wall thickness change of the tube material T. 117 is interposed. The accumulator 117 functions to absorb weighted fluctuation due to a change in stroke of the hydraulic jack 113.

  As described above, in the present embodiment, the rotating means 115 is configured to apply a driving force for rotating the tube material T around the axis C1 of the tube material T to the tube material T via the casing 11. Each guide roller 118 is arranged such that its own central axis is parallel to the axis C <b> 2 of the casing 11, and the outer peripheral surface is in contact with the outer peripheral surface of the casing 11. The guide roller 118 has a difference between the distance from the axis C1 of the tube T to the center axis C4 of the outer roller 116 and the distance from the center axis of the guide roller 118 to the radius of the outer roller 116 and the guide roller 18. It arrange | positions so that it may become equal to the difference with a radius. Each of the outer circumferential side roller 116 and the guide roller 118 is formed in a substantially cylindrical shape with metal, hard resin, or the like.

  A tube material correcting method for shaping the one end portion T1 of the tube material T using the tube material correcting device 101 configured as described above will be described. When straightening the tube material T, first, the casing 11 is disposed on the outer periphery of the one end portion T1 of the tube material T, and the inner peripheral roller 112 is disposed on the inner periphery of the one end portion T1 of the tube material T. At this time, the casing 11 having an inner diameter slightly larger than the outer diameter of the tube material T is selected. In order to cope with various pipe materials, it is preferable to provide casings with various specifications having different inner diameters.

  Subsequently, the outer peripheral surfaces of the outer peripheral roller 116 and the pair of guide rollers 118 are brought into contact with the outer peripheral surface of the casing 11, respectively. Then, the outer peripheral roller 116 is moved upward by the hydraulic jack 113, and the inner peripheral surface 11 a of the casing 11 is pressed against the outer peripheral surface of the one end T 1 of the pipe T by the outer peripheral roller 116, and the outer peripheral surface of the pipe T and the casing 11 are pressed. By applying a pressure contact force to the inner peripheral surface of the tube 11, the one end portion T <b> 1 of the tube material T is plastically deformed using the inner peripheral surface 11 a of the casing 11 as the correction mold surface. At the same time, the roller driving motor 114 is operated to rotate the outer peripheral roller 116, thereby rotating the tube T around the axis C <b> 1 of the tube T with respect to the inner peripheral roller 112 via the casing 11.

  Thus, by correcting with the casing 11 over the outer peripheral surface of the one end portion T1, the degree of deformation of the deformation portion T2 is reduced or the oval shape is corrected, and the roundness of the tube material T is corrected. If correction is insufficient even when the tube T is rotated once around the axis C1, the roundness of the tube T can be further improved by repeatedly rotating the tube T around the axis C1. . The plastic deformation generated in the tube T in this case is due to the introduction of a local force with respect to the inner peripheral side roller 112 and the line contact region between the casing 11 and the tube T, so that the deformation is limited to the minimum region, and rolling It progresses without springback by the same mechanism. As a result, effective correction is performed.

  As described above, according to the pipe material straightening device 101 and the pipe straightening method of the present embodiment, the casing 11 is attached to the pipe T by the outer peripheral side roller 116 while the casing 11 supports the outer peripheral surface of the one end T1 of the pipe T. While pressing the outer peripheral surface of the one end portion T1 to plastically deform the one end portion T1, the tube T is rotated around the axis C1 with respect to the inner peripheral side roller 112. For this reason, the one end T1 of the tube material T can be corrected to a perfect circle shape along the inner peripheral surface 11a of the casing 11.

  The rotating means 115 is configured to apply a driving force for rotating the tube material T about the axis C1 to the tube material T via the casing 11, and the outer diameter of the casing 11 is larger than the outer diameter of the tube material T. A large torque can be easily applied to T.

  The rotating means 115 includes an outer peripheral side roller 116 and a roller driving motor 114, and corrects by deforming the tube material T sandwiched between the inner peripheral side roller 112 and the outer peripheral side roller 116 via the casing 11 in the radial direction. Even when the load is large, the deformation of the casing 11 can be suppressed and the tube material T can be accurately corrected.

  Since the rotating means 115 includes the guide roller 118, the tube material T can be rotated more stably around the axis C1 of the tube material T with respect to the inner peripheral side roller 112. Since the pipe material correcting device 101 includes the machine base 121, the pipe material T on which the casing 11 is arranged around the axis C1 in a state where the position of the inner peripheral roller 112 is fixed by arranging the machine base 121 on the horizontal plane G. The roundness of the one end portion T1 of the tube material T can be corrected while rotating the tube material T. Further, by setting the rigidity of the casing 11 sufficiently higher than the rigidity of the tube material T, the tube material T is uniformly corrected along the inner peripheral surface 11a of the casing 11 regardless of the initial residual stress or deformation of the tube material T. be able to.

In the present embodiment, the configuration of the pipe material correcting device 101 can be changed as described below.
For example, in the pipe material straightening device 102 of the modified example shown in FIG. 15, the length of the small diameter portion 141 of the support shaft 140 of the inner peripheral side roller 112 is extended and the position of the fixed frame 123 that supports the outer peripheral side roller 116 is supported. The axial region further away from the one end T1 of the tube material T can be corrected away from the table 122.

  When configured in this manner, the tube material T is moved relative to the tube material correcting device 102 for each axial region that can be processed in a single correction process in the axial direction as indicated by the arrow X, so that the inner peripheral side from the one end T1. Correction can be made to the extent that the roller 112 and the outer peripheral roller 116 reach, and the shaping range can be expanded while keeping the shaping load the same. For example, correction processing is started from one end T1 of the tube material T, the tube material correction device 102 is fixed, the tube material T is moved toward the tube material correction device 102 in the tube axis direction by the shaping width, and correction processing is performed again. By repeating this cycle, the shaping width can be expanded without changing the correction load.

  In addition, since the inner peripheral roller 112 is attached via the bearing 142, the diameter of the inner peripheral roller 112 is changed, and the height of the outer peripheral roller 116 is adjusted by the hydraulic jack 113, so that the pipe material T It can easily cope with differences in diameter and thickness.

  In order to further reduce the diameter of the inner peripheral side roller 112, the bearing on the small diameter portion 141 side is abolished, and a bearing is disposed between the support shaft 140 and the support base 122 so that the support shaft itself becomes the support base 122. It is also possible to support the roller so as to be rotatable, and to use the small diameter portion directly as the inner peripheral roller.

Next, a casing 11B used in the fifth embodiment of the present invention will be described with reference to FIG.
FIG. 16 is a structural view of the casing, (a) is a perspective view in an assembled state, (b) is a perspective view of a main part of a slide mechanism of a divided piece constituting the casing, and (c) is a separation of adjacent divided pieces. It is a principal part perspective view which shows a state.

  The casing 11B can be used in place of the casing 11 of the pipe material straightening device of the first to fourth embodiments, and a plurality (three in the illustrated example) of the same shape is divided in the circumferential direction. It is divided into pieces 201. At both ends of the divided piece 201, an overlapping piece 203 which is opposite on both ends is provided by inserting an axial rectangular cutout 202 which is opposite on both ends. Then, by overlapping the overlapping pieces 203 of the adjacent divided pieces 201, a ring-shaped casing 11B having a constant diameter is configured.

  The overlapping piece 203 is provided with a positioning hole 204 that allows the positioning pin 210 to pass therethrough and a long hole 205 that is long in the circumferential direction in which the adjustment pin 220 is inserted, and the positioning pin 220 is inserted in the long hole 205. By removing 210, the divided piece 201 can be held in a slidable manner in the circumferential direction within a predetermined range defined by the long hole 205 and the adjustment pin 220 in a state of being connected in a ring shape. In this case, a slide mechanism is configured by a combination of the long hole 205 and the adjustment pin 220. Note that bolts are used for the positioning pins 210 and the adjustment pins 220, and the positioning pins 210 and the adjustment pins 220 can be prevented from being detached and fastened by screwing the nuts 221 to the tips of the bolts. The positioning pin 210 is for fixing the shape after the casing 11B is assembled.

  As described above, when the split type casing 11B is used, the detachment time can be shortened. In addition, since the diameter of the casing 11B can be increased by sliding the divided piece 201 using the adjustment pin 220, the casing 11B can be easily moved when the casing 11B is attached or detached or when the position is changed.

  According to the tube straightening device of the present embodiment configured as described above, the roundness of the one end T1 of the tube T can be corrected in a short time with a simple configuration.

  The first to fifth embodiments of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and the configuration does not depart from the gist of the present invention. Changes are also included. Furthermore, it goes without saying that the configurations shown in the embodiments can be used in appropriate combinations.

  For example, in the first to third embodiments, the case where the shaft region is the one end portion T1 of the tube material T has been described as an example. However, the axial region is not limited to the one end portion T1 of the tube material T, and may be any portion such as the central portion of the tube material T in the direction of the axis C1. The material which forms the pipe material T is not specifically limited, such as steel, copper, brass, and aluminum.

  In the first embodiment and the second embodiment, the inner diameter of the casing 11 is set to be slightly smaller than the outer diameter of the tube material T. However, the inner diameter of the casing 11 may be set larger than the outer diameter of the tube material T. In this case, the roundness is corrected so that the diameter of the one end portion T1 is increased when the tube material T is corrected.

  In the first to fourth embodiments, the hydraulic jacks 13 and 113 are used as the pressing means. However, the pressing means is not limited to this, and an electric jack having a motor can be appropriately used.

  Moreover, in the said 1st Embodiment-4th Embodiment, there is no restriction | limiting in the number of the inner peripheral rollers 12 and 112 with which a pipe material correction apparatus is equipped, and three or more may be provided. In the first and second embodiments, both the roller drive motor 17 and the roller drive motor 32 may be omitted, and the tube material T may be rotated around the axis C1 by an external force.

(Experiment)
An experimental result of correcting one end portion T1 of the tube material T using the tube material correcting apparatus 101 of the fourth embodiment will be described.
The specifications of the main configuration of the pipe material straightening device 101 used in the experiment and the specifications of the pipe material T are as follows.
Casing 11: Inner diameter 461 mm, outer diameter 700 mm.
Inner circumferential side roller 112: outer diameter 225 mm.
Outer peripheral roller 116: outer diameter 540 mm.
Tube material T: API (American Petroleum Institute) 5L X-65 (UOE steel pipe).
The outer diameter is 18 inches (457.2 mm), and the plate thickness is 17.5 mm.
The roundness of the one end T1 is 1.0 mm or more.
The pressing width of the tube material T by the casing 11 and the inner peripheral side roller 112 (length in the direction of the axis C1): 120 mm.

(Experimental procedure)
The upward pressing force by the hydraulic jack 113 was changed from 100 ton (9.8 × 10 ⁵ N) to 140 ton.
The number of rotations of the tube T around the axis C1 was fixed to 5 times.
As described above, the roundness means a difference between the maximum outer diameter and the minimum outer diameter at the one end portion T1. In addition, the allowable value of the roundness of the above-described tube material T is 0.01 times the outer diameter, and is about 4.6 mm when the outer diameter is 18 inches.

(Experimental result)
The experimental results are shown in FIG. In FIG. 17, the horizontal axis represents the pressing force by the hydraulic jack 113, and the vertical axis represents the roundness after the tube material T is rotated and corrected five times.
From this experimental result, it was found that the roundness of the one end T1 can be corrected to 0.6 mm or less when the pressing force is 130 ton or more.

1, 2, 3, 4, 5, 6, 101, 102 Pipe straightening device 11, 11B Casing 11a Inner peripheral surface 12, 112 Inner peripheral roller 13, 113 Hydraulic jack (pressing means)
15, 31, 41, 115 Rotating means 16, 116 Outer rollers 17, 32, 114 Roller drive motors 18, 118 Guide rollers 21 Machine base 51 Pressing means 117 Accumulator (constant pressure control means)
201 Dividing piece 203 Overlapping piece 205 Long hole (sliding mechanism)
210 Positioning Pin 220 Adjustment Pin (Slide Mechanism)
C1 axis T tube material T1 one end (axis region)

Claims (19)

A tube straightening device that corrects the roundness of an axial region that is at least part of the axial direction of the tube,
A ring-shaped casing disposed on the outer periphery of the pipe member with its inner peripheral surface formed in a circular shape facing the outer peripheral surface of the axial region of the pipe member;
An inner peripheral roller disposed on the inner periphery of the pipe member by bringing its outer peripheral surface into contact with the inner peripheral surface of the axial region of the pipe member;
By exerting a pressure contact force between the inner peripheral surface and the outer peripheral surface of said tube member of said casing, and the inner peripheral surface of the casing and correcting die surface, the inner peripheral surface of the shaft region of the pipe material the casing Pressing means for plastically deforming while advancing shape deformation following the shape of
Rotating means for relatively rotating the tube material and the inner peripheral roller around the axis of the tube material;
A pipe material straightening device comprising:   The pressing means applies a pressing force between the inner peripheral surface of the casing and the outer peripheral surface of the pipe by pressing the inner peripheral roller against the inner peripheral surface of the pipe toward the casing. The pipe material straightening device according to claim 1, wherein   The tube straightening device according to claim 2, wherein the rotating unit applies a driving force for rotating the tube around an axis thereof to the tube through the casing. The rotating means is
The rotation axis of the casing is parallel to the axis of the casing, the outer peripheral surface is in contact with the outer peripheral surface of the casing, and the outer peripheral side roller disposed on the radially outer side of the casing with respect to the inner peripheral side roller;
A roller drive motor for rotating the outer peripheral side roller about its rotation axis;
The pipe material straightening device according to claim 3, comprising: The rotating means is
The axis of rotation of the casing is parallel to the axis of the casing, the outer peripheral surface abuts on the outer peripheral surface of the casing, and the inner peripheral rollers are opposite to each other in the circumferential direction of the casing from the radially outer side of the casing. A pair of outer peripheral rollers arranged at different positions, and
A roller drive motor for rotating the pair of outer peripheral rollers in the same direction around their respective rotation axes;
The pipe material straightening device according to claim 3, comprising: The rotating means is
The axis of rotation of the tube is parallel to the axis of the casing, the outer peripheral surface is in contact with the outer peripheral surface of the casing, and the tube material and the inner peripheral roller rotate relatively around the axis of the tube material. The pipe material correcting device according to claim 4 or 5, wherein a guide roller for guiding is provided separately from the outer peripheral side roller.   6. The apparatus according to claim 4, further comprising a machine base that supports the inner peripheral roller and the outer peripheral roller so as to be rotatable about the respective rotation axes and to which the pressing means and the roller drive motor are attached. The tube material straightening device according to 1.   The tube straightening device according to claim 2, wherein the rotating unit applies a driving force for rotating the tube around an axis thereof to the tube through the inner peripheral side roller.   The pipe material correcting device according to any one of claims 1 to 8, wherein a plurality of the inner peripheral rollers are provided with the axis of the pipe material as a symmetric axis.   The pressing means applies a pressing force between the inner peripheral surface of the casing and the outer peripheral surface of the pipe member by pressing the casing against the outer peripheral surface of the pipe member toward the inner peripheral side roller. The pipe material straightening device according to claim 1.   The tube straightening device according to claim 10, wherein the rotating unit applies a driving force for rotating the tube around an axis thereof to the tube through the casing. The rotating means is
The rotation axis of the casing is parallel to the axis of the casing, the outer peripheral surface is in contact with the outer peripheral surface of the casing, and the outer peripheral side roller disposed on the radially outer side of the casing with respect to the inner peripheral side roller;
A roller drive motor for rotating the outer peripheral side roller about its rotation axis;
The pipe material straightening device according to claim 11, comprising:   The pipe material correcting device according to claim 12, wherein the pressing means presses the casing against the outer peripheral surface of the pipe material toward the inner peripheral side roller via the outer peripheral side roller. The rotating means is
The axis of rotation of the tube is parallel to the axis of the casing, the outer peripheral surface is in contact with the outer peripheral surface of the casing, and the tube material and the inner peripheral roller rotate relatively around the axis of the tube material. The pipe material straightening device according to claim 12 or 13, wherein a guide roller for guiding is provided separately from the outer peripheral side roller.   The tube straightening device according to any one of claims 1 to 14, further comprising a constant pressure control unit configured to control a pressing force by the pressing unit to a constant pressure regardless of a change in thickness of the tube material.   The pipe material correcting device according to any one of claims 1 to 15, wherein the casing can be divided into a plurality of parts in a circumferential direction.   The casing is divided into a plurality of divided pieces in the circumferential direction, and the adjacent divided pieces are connected to each other by passing a positioning pin through an overlapping piece provided at an end portion of the adjacent divided piece, whereby a constant diameter is obtained. And a slide mechanism that supports the divided pieces so as to be slidable by a predetermined range in the circumferential direction by removing the positioning pins, and between the overlapping pieces of adjacent divided pieces. The pipe material straightening device according to claim 16, wherein the pipe material straightening device is provided. A tube straightening method for correcting the roundness of an axial region that is at least part of the axial direction of the tubular material,
The casing is arranged on the outer periphery of the pipe material with the inner peripheral surface of a ring-shaped casing having an inner peripheral surface formed in a circle facing the outer peripheral surface of the shaft region, and the outer peripheral surface is the inner periphery of the shaft region of the tube material. The inner peripheral surface of the casing is arranged by placing an inner peripheral roller on the inner periphery of the pipe member in contact with the surface and applying a pressing force between the inner peripheral surface of the casing and the outer peripheral surface of the pipe member. The shaft region of the tube material is plastically deformed while advancing shape deformation following the shape of the inner peripheral surface of the casing, and the tube material and the inner peripheral roller are moved around the axis of the tube material. A tube straightening method characterized by relatively rotating.   19. The method according to claim 18, wherein the axial region is changed by relatively moving the tubular material, the casing, and the inner peripheral roller in the axial direction.

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