JP2014018828A - Device for correcting pipe material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To correct even a sharp local deformation place by reliably applying a press-contact force in order to plastically deform a pipe material with th small press-contact force to the minimum area.SOLUTION: A device 1 for correcting a pipe material includes: a ring-shaped casing 2 disposed on an outer circumferential surface of a pipe material T and causing an inner circumferential surface forming a cross-sectional round shape to face the outer circumferential surface of the pipe material T; and a plurality of inner circumferential side rollers 3, which can be abutted with the inner circumferential surface of the pipe material T and are arrayed radially to a support 15. Each of the inner circumferential side rollers 3 is pressed with a plurality of taper surfaces 26 forming a polygonal pyramid shape of pressing means 4 reciprocative along an axial line, and press-contacts the inner circumferential surface of the pipe material T to make it deform plastically and perform correcting work thereof. The pressing means 4 is coupled with a rod of a hydraulic cylinder, and selectively takes a position, for making the inner circumferential side rollers 3 project therefrom, and a retreated position by the reciprocation of the rod. The inner circumferential side rollers 3 and the pressing means 4 perform the correcting work of the pipe material by performing rotation by rotating means provided outside the pipe material via a coupling member.

Description

  The present invention relates to a tube material correcting device that corrects the roundness of a tube material.

  In general, pipe materials used for pipelines and piles may cause poor bonding and poor quality when performing welding and other mechanical joints if their roundness is not sufficiently secured. . Therefore, correction for increasing the roundness of various portions in the axial direction of the pipe material is performed 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.
In this straightening device, an arc-shaped lining jig provided with a pressurizing mechanism is arranged in a ring shape on the inner peripheral surface of the end of the tube, and an external fixing ring is in close contact with the outer peripheral surface of the end of the tube. Is installed. And an electrode is installed in an external fixing ring, and a pipe material is heated by supplying with electricity through the edge part of a pipe material between an external fixing ring and a lining jig | tool. At the same time, the end of the tube is corrected to a perfect circle by plastically deforming the tube by heat by pressing the lining jig outward by the pressurizing mechanism.

Also, as another straightening device, as an expanding device that expands a large-diameter welded steel pipe (UOE pipe) from the inside and straightens it to a perfect circle, for example, a lining jig disposed inside the pipe using a hydraulic pressure of about 1000 tons There is known a technique in which a pressure spreading outward is applied by the pressure mechanism and the roundness is corrected by the pressing force.
In these cases, the width in the tube axis direction in which the diameter of the pipe material is expanded to be rounded is determined by the width of the lining jig.

JP 58-138518 A

However, the straightening device described in Patent Document 1 has a problem in that if the pipe material is a high-strength material for heating the pipe material, the material composition changes and the mechanical properties deteriorate.
In addition, since other deformation devices have a large deformation region due to the expanding device, there is a disadvantage that the device is enlarged even when the diameter of the pipe material is expanded by 1%, for example.
Furthermore, in these conventional straightening devices, there is almost no slippage in the circumferential direction between the pipe material and the lining jig for pipe expansion provided on the inner side during diameter expansion, and there is a change in curvature in a part of the peripheral surface of the pipe material. If there is an abrupt and local deformation portion, there is a disadvantage that correction by diameter expansion is difficult.

  The present invention has been made in view of such a problem, and in order to plastically deform a tube material with a small pressure contact force in a minimum region, the pressure contact force is surely applied even at a sudden local deformation point. It is an object of the present invention to provide a pipe straightening device that can be straightened.

  A tube straightening device according to the present invention is a tube straightening device that corrects the roundness of a pipe, and is arranged on the outer peripheral surface of the pipe so that the inner peripheral surface formed in a circular cross section faces the outer peripheral surface of the pipe. A ring-shaped casing, a plurality of inner peripheral rollers that can be in contact with the inner peripheral surface of the pipe material and arranged at predetermined intervals, and a pressing surface that can press the plurality of inner peripheral side rollers against the inner peripheral surface of the pipe member, respectively. A pressing means for plastically deforming the pipe material by pressing the outer peripheral surface of the pipe material against the inner peripheral surface of the casing, and a rotating means for relatively rotating the pipe material and the inner peripheral roller around the axis of the pipe material It is characterized by providing.

According to the tubular material straightening device of the present invention, the casing is disposed on the outer peripheral surface of the tubular material, the inner peripheral roller is brought into contact with the inner peripheral surface, and the inner peripheral roller is respectively pressed by the pressing surface of the pressing means. The pipe material can be plastically deformed by pressing against the inner peripheral surface of the casing and bringing the outer peripheral surface of the pipe member into pressure contact with the inner peripheral surface of the casing. In addition, by rotating the pipe and the inner peripheral roller relative to each other around the axis of the pipe by the rotating means, it is possible to perform correction to increase the roundness by plastic deformation over the entire circumference of the pipe.
In this case, the plastic deformation occurring 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 the circumferential direction of the pipe material according to the constant volume rule. Converted to stretch deformation to. Elongation deformation in the circumferential direction is effective because the shape deformation of the tube progresses following the shape of the inner peripheral surface of the casing under the restriction of the shape by the inner peripheral surface of the casing in the deformation direction. Correction is performed.
Then, it is possible to perform roundness correction processing over the entire length of the pipe material by changing the pressure contact position by the casing and the inner peripheral side roller with respect to the axial direction of the pipe material.

  Further, a moving means for moving the pressing means back and forth in the axial direction of the pipe material is further provided, and the pressing means has a first position for causing each inner peripheral roller to protrude radially outward on each pressing surface by the moving means, and a pressing surface. It may be possible to selectively take a second position separated from a position where the inner peripheral side roller is pressed.

  By moving the pressing means from the second position to the first position along the axis of the tube by the moving means, the inner peripheral roller protrudes radially outward on the pressing surface of the pressing means and is brought into pressure contact with the inner peripheral surface of the pipe. Therefore, it is possible to correct the pipe material in the circumferential direction by rotating the inner peripheral side roller in the circumferential direction of the pipe material by the rotating means. Then, the pressing means after the correction processing is moved from the first position to the second position, so that the pressure contact of the tube by the inner peripheral side roller is released. Thereafter, the pressing means and the inner peripheral roller can be shifted in position along the axial direction of the tube material, and can be corrected in other regions in the axial direction of the tube material.

  Further, the pressing means is formed in a polygonal pyramid having a plurality of tapered surfaces on the pressing surface, and the inner peripheral side roller is moved with respect to the inner peripheral surface of the pipe material by moving the pressing means back and forth in the axial direction of the pipe material. It can be advanced and retracted in the radial direction.

When the pressing means is moved in the axial direction of the pipe material in the pipe material and the pressing surface composed of a plurality of tapered surfaces is advanced toward the inner peripheral roller side, the plurality of inner peripheral rollers are simultaneously pressed by the pressing surface in the radial direction. The roundness of the pipe material can be increased by advancing outward and pressing the inner peripheral surface of the pipe material toward the casing by the inner peripheral side rollers to cause plastic deformation. In this state, when the tube member and the inner peripheral roller are relatively rotated around the axis of the tube material by the rotating means, the entire circumference of the tube material is plastically deformed so that the roundness can be improved.
On the other hand, when the pressing means is moved back and forth in the axial direction in the pipe material and the pressing surface composed of a plurality of taper surfaces is retracted from the position where the inner peripheral side roller is pressed, the inner peripheral side roller whose pressure is released becomes the inner side of the pipe material. The inner circumferential side roller and the pressing means can move along the axis of the tube material away from the peripheral surface, and the position can be shifted in the longitudinal direction of the tube material to increase the roundness.

Further, the pressing means may be connected to the rotating means via a connecting member that is inserted through the pipe, and the inner peripheral roller may be rotatable integrally with the pressing means.
Since the pressing means can be rotated via the connecting member when the rotating means is rotated in a state where the plurality of inner peripheral rollers are pressed against the inner peripheral surface of the pipe material by the pressing means, the plurality of inner peripheral rollers are also included in the pipe material. By rotating while pressing the peripheral surface, the outer peripheral surface of the tube can be corrected to a perfect circle or a shape close to this, following the inner peripheral surface of the casing.

Further, the casing may be connected such that a plurality of divided parts divided in the circumferential direction can be expanded and contracted in the circumferential direction.
When attaching / detaching the casing to / from the pipe material, the casing can be attached to the outer peripheral surface of the pipe material by tightening in the direction in which each divided part of the casing is contracted, and by expanding the divided parts in the casing in the direction of expanding the diameter. It is possible to remove the pipe material from the casing or move the correction processing position of the pipe material.
The casing may be integrally formed in a ring shape.

The casing has a ring-shaped casing body whose surface facing the outer peripheral surface of the tube material is an inclined surface, and an inclined surface that can be attached to and detached from the inclined surface of the casing body and the tube material and can contact the inclined surface. A taper ring may be provided.
In the case where the pipe material is attached to the inner peripheral surface of the casing, the pipe material can be attached to the inside of the casing by fitting a taper ring between the casing main body and the pipe material and bringing the inclined surface and the inclined surface into contact with each other. Also, when removing the pipe from the casing, if the roundness of the pipe is straightened by pressing the inner circumference roller against the inner circumference of the pipe and plastically deforming, stress remains after the straightening is finished, and the casing is difficult to come off. By removing the taper ring first, a gap is formed between the pipe and the casing body, and even if the casing body is formed of multiple divided parts, the load applied to the fastening member such as the positioning pin can be reduced. It is easy to remove the member, and it is easy to divide the casing into a plurality of divided parts and to separate the casing and the pipe material.

According to the tubular material straightening device of the present invention, the inner peripheral roller is brought into pressure contact with the inner peripheral surface of the tubular material by the pressing surface of the pressing means, and the outer peripheral surface of the tubular material is plastically deformed following the inner peripheral surface of the casing. The pressure can be increased, and the pressure contact of the inner peripheral roller with the inner peripheral surface of the pipe material by the pressing surface can be released to finish the correction of the pipe material.
In addition, the plastic deformation region of the tube material is limited to a minimal region by introducing a local force against the line contact region, in which the inner peripheral side roller is pressed against the inner peripheral surface of the tube material during correction to increase the roundness of the tube material. Since only a small pressure contact force is required, the apparatus can be miniaturized. In addition, since the plastic deformation stress is applied to the minimal region, it is possible to perform correction to increase the roundness by reliably applying a pressure contact force even at a sudden local deformation portion of the pipe material.

It is sectional drawing of the direction orthogonal to the axis line of the pipe material of the pipe material correction apparatus by 1st embodiment of this invention. It is a longitudinal cross-sectional view of the direction along the axis line of the pipe material of the pipe material correction apparatus shown in FIG. The casing is shown, (a) is a perspective view of the casing, (b) is a diagram of the connecting portion in the expanded state of the divided parts of the casing, (c) is a connecting portion of the divided parts shown in FIG. FIG. It is a figure which shows the pipe straightening process of the pipe straightener by 1st embodiment, (a) is a figure of the setting process which press-contacted the inner peripheral surface of a pipe, (b) is a figure of a processing process, (c) is shrinkage | contraction. It is a figure of a diameter process. It is sectional drawing of the direction orthogonal to the axis line of the pipe material of the pipe material correction apparatus by 2nd embodiment of this invention. It is a longitudinal cross-sectional view of the direction along the axial line of the pipe material of the pipe material correction apparatus shown in FIG. 5, and is a figure which shows a setting state. In FIG. 6, it is a figure which shows the state which diameter-reduced the inner peripheral side roller. It is a figure which shows the pipe straightening process of the pipe straightener by 2nd embodiment, (a) is a figure of a setting process, (b) is a figure of a process, (c) is a figure of a diameter reduction process. It is sectional drawing which shows the rotation means by the modification of a pipe material correction apparatus. It is a longitudinal cross-sectional view of the pipe material correction apparatus shown in FIG.

Hereinafter, a pipe material correcting device 1 according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 4.
As shown in FIG. 1 and FIG. 2, the tube straightening device 1 is a device that corrects the roundness of a substantially cylindrical tube T made of steel over a part or the entire length of an end portion or the like. In the present specification, the roundness means the ratio of the difference between the maximum outer diameter and the minimum outer diameter in an arbitrary cross section perpendicular to the central axis C1 of the tube material T to the specified outer diameter. And correcting the roundness means correcting the tube material T so that the roundness approaches zero. The closer the roundness is to zero, the closer the cross-sectional shape of the tube material T is to a perfect circle.

The tube straightening device 1 according to the present embodiment shown in FIGS. 1 and 2 presses the casing 2 having a ring shape and the inner peripheral surface 2a attached to the outer peripheral surface Ta of the tube T, and the inner peripheral surface Tb of the tube T. A plurality of inner peripheral side rollers 3 that can be corrected, a pressing member 4 that advances and retreats the inner peripheral side rollers 3 in the radial direction, and that can rotate about the axis C1, and a pressing means 4 and an inner peripheral side roller 3 that are pipe members. Rotating means 5 (see FIG. 4) for rotating in the circumferential direction along the inner peripheral surface Tb of T.
The axis C1 of the tube material T, the axis C2 of the casing 2, and the rotation axis C3 of the inner peripheral side roller 3 are all set substantially on the same line.

  As shown in FIGS. 1 and 3, the casing 2 is formed in a ring shape by connecting, for example, three arcuate divided parts 7 having a substantially central angle of 120 ° so that the parts can be expanded and contracted. Each divided part 7 is formed in, for example, a substantially square shape in cross section. In addition, the number of the division | segmentation parts 7 which comprise the casing 2 is not limited to three pieces, It can divide | segment into an appropriate plurality. The casing 2 is made of metal such as steel, and the rigidity of the casing 2 is preferably sufficiently higher than the rigidity of the tube material T.

Next, the casing 2 composed of a plurality of divided parts 7 will be described with reference to FIG.
In the casing 2 shown in FIG. 3, the divided parts 7 divided into a plurality of same and same shapes in the circumferential direction are cut out at both ends in the circumferential direction in a rectangular shape at opposite ends in the direction of the axis C2 in the thickness direction. Cutout pieces 7a and 7b having a stepped shape are formed. Each divided part 7 can be joined to each other by overlapping one notch piece 7a of one divided part 7 and the other notched piece 7b of another divided part 7 adjacent to each other. And the ring-shaped casing 2 which has a fixed diameter is comprised by mutually superimposing the notch pieces 7a and 7b of three adjacent division | segmentation parts 7 each.

In FIG. 3, the notch pieces 7a and 7b at both ends of each divided part 7 are provided with a positioning hole 10 for fixing the positioning pin 8 and an arcuate long hole 12 for inserting the adjusting pin 11, respectively. Yes. By inserting the adjustment pin 11 into the long hole 12 and removing the positioning pin 8, a predetermined range defined by the long hole 12 and the adjustment pin 11 with the plurality of divided parts 7 connected in a ring shape. It can be held slidable only in the circumferential direction. In this case, a combination of the long hole 12 and the adjustment pin 11 constitutes a slide mechanism that can expand and contract the inner diameter of the casing 2.
Note that bolts are used for the positioning pins 8 and the adjusting pins 11, and the positioning pins 8 and the adjusting pins 11 can be prevented from coming off and fastened by screwing a nut 13 to the tip of the bolt. The positioning pin 8 is for fixing the shape of the casing 2 after the assembly of the casing 2 in which each divided part 7 is reduced in diameter.

  As described above, when the split type casing 2 is used, it is possible to shorten the time for attaching to and detaching from the pipe material correcting device 1. Moreover, since the casing 2 can be expanded or contracted by sliding the divided parts 7 using the adjustment pins 11, it is easy to remove the casing 2 or change the mounting position on the tube T. Can be moved.

  As shown in FIG. 1, the casing 2 is formed in a perfect circle or a substantially true circle when the inner peripheral surface 2 a is viewed from the direction of the axis C <b> 2 of the casing 2. Note that the rigidity of the casing 2 is preferably sufficiently higher than the rigidity of the tube material T. The casing 2 is attached so as to be substantially coaxial or parallel to the pipe material T.

  The inner diameter of the casing 2 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 2 is attached to the tube material T, that is, the casing 2 is in tight contact with the tube material T. Is preferably attached. However, the inner diameter of the casing 2 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 due to the pressure contact between the casing 2 and the tube material T. .

Next, the inner peripheral side roller 3, the pressing unit 4, and the moving unit that can be installed inside the tube material T will be described with reference to FIGS. 1 and 2.
A cylindrical support 15 is disposed inside the tube T, and a plurality of, for example, six inner rollers 3 are radially inserted into one end of the support 15 so as to advance and retract in the radial direction. It is said that. Each inner peripheral roller 3 has a substantially U-shaped cross section that is attached to a support shaft 16, a base portion 17 connected to the distal end side of the support shaft 16, and a recess 17 a formed in the base portion 17 so as to be able to advance and retract. The receiving portion 18 and a forming roller 19 that is rotatable around a support shaft fixed to the receiving portion 18 are configured.
The forming roller 19 is formed in a substantially cylindrical shape, and is rotatable around a support shaft parallel to the central axis C <b> 1 of the receiving portion 18. The forming roller 19 is configured by providing a protective layer on the surface of, for example, steel.

In the inner peripheral side roller 3, for example, a spring is used as an elastic member that absorbs an impact, rattling or the like when the forming roller 19 comes into contact with the inner peripheral surface Tb of the tube T between the concave portion 17 a of the base portion 17 and the receiving portion 18. 21 is installed. Further, an urging spring 22 is disposed between the base portion 17 and the support 15 as urging means for urging the inner peripheral roller 3 inward of the support 15 in the radial direction.
In addition, holes 15a through which the support shaft 16 of the inner peripheral roller 3 is inserted are formed in the support body 15 at substantially equal intervals in the circumferential direction. Therefore, the inner circumferential side rollers 3 are arranged radially at equal intervals in the circumferential direction of the support 15.

Further, in the support 15, a pressing means 4 that can be advanced and retracted in the direction of the axis C <b> 1 in order to advance and retract the inner peripheral roller 3 in the radial direction, and a pressing means 4 provided at a position adjacent to the pressing means 4. A hydraulic cylinder 25 is provided as a moving means for moving back and forth. The pressing means 4 is a polygonal pyramid formed by a plurality of surfaces facing the support shaft 16 of each inner peripheral roller 3, for example, six tapered surfaces 26, here a substantially hexagonal pyramid. The tapered tip portion is connected to the rod 28 of the hydraulic cylinder 25 via an operating plate 27 that partitions oil pressure.
In the hydraulic cylinder 25, the operating plate 27 and the rod 28 are movable along the axis C1 by hydraulic pressure with respect to the main body 29, and the pressing means 4 connected to the operating plate 27 is moved forward and backward in the direction of the axis C1. Each taper surface 26 can be moved back and forth with respect to the support shaft 16 of each inner peripheral roller 3.

Therefore, by switching the hydraulic cylinder 25 to ON or OFF, the support shaft 16 of the inner peripheral roller 3 is pressed by each tapered surface 26 of the pressing means 4 to advance radially outward, or the tapered surface 26 By separating from the support shaft 16 of the inner peripheral side roller 3, the inner side roller 3 can be retracted radially inward by the biasing force of the biasing spring 22.
As a result, the rod 28 and the pressing means 4 are moved forward and backward in the direction of the axis C1 by the hydraulic cylinder 25, and the inner circumferential roller 3 is moved forward and backward in the radial direction of the tube T perpendicular to the axis C1 by the tapered surface 26 of the pressing means 4. The direction can be changed. In order to make the inner peripheral side roller 3 advance and retract smoothly with respect to the forward and backward movement of the pressing means 4, the base end portion 16 a of the support shaft 16 of the inner peripheral side roller 3 is formed on an inclined surface so as to come into surface contact with the tapered surface 26. Is preferred.

Next, referring to FIG. 4, the rotating means 5 that rotates each inner peripheral roller 3 along the inner peripheral surface Tb of the tube material T will be described. The inner circumferential side roller 3 shown in FIG. 4 has the same configuration as that shown in FIG. In FIG. 4, the support 15 that can move along the axis C <b> 2 in the tube T is connected to a gear 32 via a connecting member 31, and the gear 32 is directly or not shown on the output shaft 34 of the drive motor 33. It is meshed via a speed reduction mechanism. The drive motor 33, the output shaft 34, the gear 32, and the connecting member 31 constitute the rotating means 5.
Then, the drive motor 33 of the rotating means 5 is rotationally driven in a state where the plurality of radially arranged inner rollers 3 are pressed against the inner peripheral surface Tb of the tube T by the pressing means 4. The roller 3 can be swung around the axis C <b> 3 so that the tube material T is pressed against the inner peripheral surface 2 a of the casing 2, and can be expanded by the press contact force.

The tube expansion correction device 1 according to the present embodiment has the above-described configuration, and next, a tube material correction method will be described with reference to FIG.
As shown in FIG. 3, the tube straightening device 1 has a ring shape in which a plurality of divided parts 7 are expanded in diameter by adjusting pins 11 and nuts 13 which are formed by overlapping notches 7 a and 7 b at both ends and penetrating each long hole 12. Are attached to a predetermined position on the outer peripheral surface Ta of the tube material T to reduce the diameters of the divided parts 7. Then, the positioning pins 8 are inserted into the positioning holes 10 and tightened with the nuts 13. Thus, the casing 2 can be attached by being fastened to the outer peripheral surface Ta of the pipe material T.

The tube T to be corrected has a deformation such as a local concave portion or a convex portion on its peripheral surface, or a non-circular shape having an appropriate cross-sectional shape such as an ellipse, and has a low roundness. It has a portion T1 (see FIG. 4).
The casing 2 is preferably selected to have an inner diameter slightly smaller than the outer diameter of the tube T. Moreover, in order to correspond to the pipe material T of various diameters, it is preferable to provide casings of various specifications having different inner diameters.
Then, as shown in FIG. 4 (a), a support body 15 provided with a pressing means 4 and a hydraulic cylinder 25 is inserted and supported by a connecting member 31 in a pipe T to which a casing 2 is attached. Hold in position. In this state, each of the inner peripheral rollers 3 held radially by the support 15 is in a position where no pressing force is applied to the inner peripheral surface Tb of the tube T by the biasing force of the biasing spring 22 or in a non-contact position.

Next, when the pipe material T is corrected by the pipe material correcting device 1, as shown in FIG. 2, the hydraulic cylinder 25 is operated to move the rod 28 and the operating plate 27 away from the inner peripheral roller 3. Together with this, the pressing means 4 moves in the support 15 along the axis C1. As a result, the support shafts 16 of the respective inner peripheral rollers 3 radially arranged by the respective substantially hexagonal pyramid tapered surfaces 26 of the pressing means 4 are protruded radially outward, and the biasing force of the biasing spring 22 is applied. On the other hand, the forming roller 19 of each inner peripheral roller 3 is held in a state in which the inner peripheral surface Tb of the tube material T is pressed.
When the forming roller 19 of each inner peripheral roller 3 is pressed against the inner peripheral surface Tb of the tube material T, the impact, backlash and the like that can be generated are absorbed by the spring 21 provided between the base portion 17 and the receiving portion 18.

  Here, by pressing the inner peripheral side roller 3 against the inner peripheral surface Tb of the tube material T by the hydraulic cylinder 25, a pressure contact force acts on the outer peripheral surface Ta of the tube material T and the inner peripheral surface 2a of the casing 2, and thereby the casing 2 The tube material T is plastically deformed with the inner peripheral surface of the tube as a straightened mold surface. At the same time, as shown in FIG. 4B, by driving the drive motor 33 of the rotating means 5, the connecting member 31 is rotated around the axis C 1 via the output shaft 34 and the gear 33. The inner peripheral rollers 3 arranged radially in an integrated manner are rotated.

As a result, the inner peripheral surface Ta of the tube T is corrected by the six inner rollers 3 so that the degree of deformation of the deformed portion T1 is reduced and the elliptical shape is corrected. Circularity is corrected.
Since the inner circumferential side rollers 3 are radially arranged at equal intervals, the tube material T can be corrected by rotating at least 60 °, but may be rotated once. If correction is insufficient even if the inner circumferential roller 3 is rotated once around the axis C1, the roundness of the tube T can be reduced by repeatedly rotating the plurality of inner circumferential rollers 3 around the axis C1. The degree can be further improved.

  In this case, the plastic deformation generated in the tube material T is caused by the same mechanism as rolling, and the radial compression deformation in the line contact region between the inner peripheral roller 3 and the casing 2 and the tube material T is changed in the circumferential direction by the constant volume rule. Converted to stretch deformation to. Elongation deformation in the circumferential direction is constrained by the inner peripheral surface 2a of the casing 2 in the deformation direction, and the deformation of the shape of the tube material T progresses following the shape of the inner peripheral surface 2a of the casing 2. To do. As a result, effective correction of the deformed portion T1 of the tube material T is performed.

In addition, by applying a load directly to the tube material T by the inner circumferential side roller 3, for example, even when there is a gap between the tubular material T and the casing 2, the inner circumferential side roller 3 can be reliably moved around the axis C1. Can be rotated.
When the correction of the deformed portion T1 of the tube material T is completed, the hydraulic cylinder 25 is turned off, so that the operating plate 27 and the rod 28 are moved toward the inner roller 3 as shown in FIG. Since each tapered surface 26 of the pressing means 4 is separated from the support shaft 16, each inner peripheral roller 3 is retracted radially inward by the urging force of the urging spring 22 and separated from the tube T.

And as shown in Drawing 4 (a)-(c), since deformed part T1 is displaced along the direction of axis C1 by correction of tube material T, in the state where casing 2 and inner peripheral side roller 3 were made to face, The tube material T is relatively displaced in the direction of the axis C1, and the tube material T is corrected by the above-described procedure.
In the case of the pipe material correcting device 1 according to the present embodiment, as shown in FIG. 4, since the deformed portion T1 moves or displaces on the tube material T by correcting the deformed portion T1 of the tube material T, the casing 2 and the inner peripheral side roller 3, the deformed portion T1 can be corrected over the entire length of the tube T by moving the tube T relative to the direction of the axis C1 and sequentially correcting the deformed portion T1.

As described above, according to the pipe material straightening device 1 and the pipe straightening method according to the present embodiment, the inner peripheral side roller 3 is pressed against the inner peripheral surface Tb while the casing 2 supports the outer peripheral surface Ta of the pipe T, and the deformed portion. Since the tube material T is rotated around the axis C1 with respect to the inner peripheral roller 3 while plastically deforming T1, the tube material T can be corrected to a perfect circle shape along the inner peripheral surface 2a of the casing 2.
In addition, since the pipe material T is corrected by rotating the inner peripheral side roller 3 around the axis C1 while applying a pressure contact force between the casing 2 and the pipe material T, it is shorter than the conventional correction device described above. The roundness of the pipe can be corrected with time.

Further, since the plurality of inner peripheral rollers 3 are swung in the circumferential direction with respect to the inner peripheral surface Tb of the tube material T, the plastic deformation region is limited to a minimal region by introducing a local pressing force against the line contact region, and Since only a small pressure contact force needs to be applied, the tube material correcting device 1 can be downsized. Further, since plastic deformation is imparted to the minimum region by the inner peripheral side roller 3, it is possible to reliably apply a pressing force to a sudden local deformation portion and correct it.
Then, while the casing 2 and the inner peripheral side roller 3 are opposed to each other, the pipe material T is relatively moved in the direction of the axis C1, and the inner peripheral side rollers 3 are sequentially swung in the peripheral direction to correct the pipe material T. Therefore, correction can be performed over the entire length of the tube material T.

Further, the pressing means 4 is moved forward and backward by the hydraulic cylinder 25 in the direction of the axis C1 of the tube T, so that the inner peripheral roller 3 is advanced and retracted in the direction perpendicular to the direction of the axis C1 by the tapered surface 26 of the pressing means 4. Since the direction of the load can be changed so that the correction can be performed, the correction position can be easily moved and switched with respect to the tube T, and the entire length of the tube T can be corrected smoothly in a short time.
In addition, in order to correct the pipe material T by rotating the six inner peripheral rollers 3 radially arranged at equal intervals on the support body 15, the pressure contact force to the pipe material T is evenly applied and highly accurate. It can be corrected.

Moreover, since the casing 2 is formed so that the plurality of divided parts 7 can be expanded and contracted by the elongated holes 12 formed in the notch pieces 7a and 7b at both ends and the adjusting pin 11, the outer diameter of the tube material T is determined when the tube 2 is moved or inserted / removed. It can be easily moved and inserted / removed by increasing the size, and a large tightening load can be easily applied to the tube T by reducing the diameter and fastening the positioning pin 8 to the positioning hole 10. In addition, correction by the casing 2 and the inner peripheral side roller 3 can be performed over the entire length of the tube material T.
The rotating means 5 is disposed outside the tube material T, and transmits a rotational force to the plurality of inner peripheral rollers 3 and the support body 15 disposed in the tube material T via the connecting member 31 so as to be relatively movable. Therefore, correction can be performed over the entire length of the tubular body T.

In addition, the pipe material correction apparatus 1 by this invention is not limited to embodiment mentioned above, A suitable change, substitution, etc. are possible in the range which does not deviate from the summary of this invention. Next, other embodiments and modifications of the present invention will be described, but the same or similar parts and members as those of the above-described embodiment will be denoted by the same reference numerals, and description thereof will be omitted.
First, a pipe material correcting device 40 according to a second embodiment of the present invention will be described with reference to FIGS.
The pipe straightening device 40 according to the second embodiment is different from the first embodiment in the configuration of the casing, and the remaining configuration is the same. Therefore, the second embodiment will be described by limiting to the casing.

  In the pipe material straightening device 1 according to the first embodiment described above, the casing 2 is attached to the pipe material T, and after the straightening process, if a load / stress remains on the positioning pin 8 fastened to the positioning hole 10 of the divided part 7, the casing There remains a problem that it becomes difficult to separate the two divided parts 7 and to increase the diameter. In the second embodiment, such a problem can be solved and a plurality of divided parts 7 can be easily separated or expanded in diameter.

  The casing 41 in the pipe material straightening device 40 according to the second embodiment shown in FIGS. 5 to 7 is a casing body 42 and a taper ring 43 that are assembled so as to be fitted. The casing main body 42 includes a plurality of substantially arc-shaped, for example, three divided parts 44, as in the first embodiment described above, and stepped cutout pieces 7a and 7b are provided at both ends of each divided part 44. In addition, a positioning hole 10 and a long hole 12 are formed in each notch piece 7a, 7b, and a positioning pin 8 and an adjustment pin 11 are inserted, respectively, so that the nut 13 can be fastened or expanded / contracted.

As shown in FIGS. 6 and 7, each divided part 44 of the casing main body 42 has a substantially trapezoidal cross section, and the inclined surface 44 a is disposed to face the outer peripheral surface Ta of the tube T. The casing main body 42 in a reduced diameter state in which the positioning pins 8 are inserted into the positioning holes 10 and fastened with the nuts 13 in a state in which the notched pieces 7a and 7b of the divided parts 7 are joined to each other, The inclined surface 44a is larger in inner diameter than the outer peripheral surface Ta of the tube material T, and a gap 45 is formed therebetween.
For example, as shown in FIGS. 6 and 7, the taper ring 43 that can be fitted into the gap 45 of the casing body 42 has a substantially right-angled triangular cross section, and the inclined surface 43 a that is in surface contact with the inclined surface 44 a of the casing body 42 and the tube material T. And a bottom surface 43b in surface contact with the outer peripheral surface Ta.

  Accordingly, in the tube straightening device 40, as shown in FIG. 8A, a ring-shaped casing body 42 is formed in which a plurality of divided parts 44 are assembled on the outer peripheral side of the tube T and the positioning holes 10 are fastened by the positioning pins 8. In this state, the taper ring 43 is fitted into the gap between the tube material T and the casing main body 42 so that the inclined surface 44a and the inclined surface 43a are brought into pressure contact with each other by surface contact to form the casing 41. Can be attached by tightening.

Then, as shown in FIG. 8 (b), after the straightening of the tube material T is performed as in the first embodiment, the taper ring 43 of the casing 41 is moved to the casing body as shown in FIG. 8 (c). Since the gap 45 is generated by pulling out between the pipe 42 and the tube material T, the stress and load remaining in the casing 41 are released. In this state, the load applied to the positioning pins 8 of the divided parts 44 connected to each other of the casing body 42 is reduced. Therefore, it becomes easy to divide the casing body 42 into a plurality of divided parts 44, or to remove the positioning pins 8 and guide them with the adjustment pins 11 and the long holes 12 to expand the diameter.
Therefore, it is possible to perform straightening processing that is continuous with the movement of the casing main body 42 on the tube material T in a short time.

  According to the pipe material straightening device 40 according to the second embodiment, the taper ring 43 is removed even if stress and load remain on the positioning pins 8 of the divided parts 44 of the casing main body 42 in the casing 41 surrounding the pipe T by straightening. Thus, the load applied to the positioning pin 8 of the casing main body 42 can be released and the positioning pin 8 that fastens each divided part 7 can be easily removed. Therefore, the removal of the casing 41 after completion of the straightening process and the movement of the straightening position on the pipe material T can be easily performed in a short time.

In the correction devices 1 and 40 according to the first and second embodiments described above, the casings 2 and 41 and the tube T are held in a stationary state, and the inner peripheral side roller 3 is rotated by the rotating means 5 to perform correction processing. However, the present invention is not limited to such a configuration.
For example, instead of the rotating means 5, in the modification of the pipe material straightening devices 1 and 40 shown in FIGS. 9 and 10, the outer peripheral side roller 48 that can be rotated by the drive motor 47 is pressed against the outer peripheral surface of the casing 2 or 41. The rotating means 49 may be configured by installing them. 9 and 10, guide rollers 50 that support the casings 2 and 41 may be provided on both sides of the outer peripheral side roller 48.
Thus, the casings 2 and 41 and the tube material T are rotated about the axis C1 by the rotation of the outer roller 48 while the plurality of inner rollers 3 pressed against the inner surface Tb of the tube material T are held stationary. The tube material T can be straightened by the inner peripheral side roller 3.

In addition, the outer peripheral side roller 48 which rotates the casings 2 and 41 and the pipe material T is not limited to one, You may install multiple. Further, the guide roller 50 may not be provided.
Further, in each of the above-described embodiments and the like, the six inner peripheral rollers 3 are arranged radially at equal intervals around the support 15, but the number of the inner peripheral rollers 3 can be appropriately arranged in the circumferential direction without being limited thereto. The inner circumferential roller 3 is preferably balanced because it can receive the pressing force / load applied to the tube material T and the reaction force by arranging three or more inner circumferential rollers 3 at equal intervals. 2 may be arranged at opposite positions.
Further, a plurality of inner circumferential side rollers 3 may be arranged radially at unequal intervals in the circumferential direction.

  Further, in each of the above-described embodiments and modifications, correction processing is performed for the entire length of the tube material T, but the present invention is not limited to such a configuration, and the end of the tube material T in the direction of the axis C1. An appropriate part such as a portion or a center portion may be straightened. Moreover, the material which forms the pipe material T is not specifically limited, such as steel, copper, brass, and aluminum.

In each of the above-described embodiments and modifications, the inner diameters of the casings 2 and 41 are set to be slightly smaller than the outer diameter of the tube material T. However, the inner diameters of the casings 2 and 41 may be set slightly larger than the outer diameter of the tube material T. In this case, the roundness is corrected so that the inner diameter is expanded when the tube material T is corrected.
Further, in each of the above-described embodiments and modifications, the hydraulic cylinder 25 is used as the moving unit that moves the pressing unit 4, but the moving unit is not limited to this, and an electric cylinder or the like can be used as appropriate. Alternatively, the pressing means 4 may be controlled to advance and retract by a hydraulic cylinder and a spring.
Although the pressing means 4 is formed in a polygonal pyramid shape with a pressing surface comprising a plurality of tapered surfaces 26, the pressing surface does not necessarily have to be a polygonal pyramid shape, and may be formed in a curved surface such as a conical shape. Good.

DESCRIPTION OF SYMBOLS 1, 40 Pipe material correction apparatus 2, 41 Casing 3 Inner peripheral side roller 4 Pressing means 5, 49 Rotating means 7, 44 Divided parts 7a, 7b Notch piece 8 Positioning pin 10 Positioning hole 11 Adjustment pin 12 Long hole 15 Support body 19 Molding Roller 25 Hydraulic cylinder 26 Tapered surface 31 Connecting member 42 Casing body 43 Tapered ring 43a Inclined surface 44a Inclined surface 48 Outer roller T Tube material Outer surface Tb Inner surface

Claims (6)

A pipe material straightening device that corrects the roundness of the pipe material,
A ring-shaped casing that is disposed on the outer peripheral surface of the tube material and has an inner peripheral surface formed in a circular cross section facing the outer peripheral surface of the tube material;
A plurality of inner circumferential side rollers arranged at a predetermined interval and capable of contacting the inner circumferential surface of the tube material;
A pressing surface that has a pressing surface capable of pressing each of the plurality of inner peripheral side rollers against the inner peripheral surface of the tube material, and presses the outer peripheral surface of the tube material against the inner peripheral surface of the casing to cause plastic deformation of the tube material. Means,
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: A moving means for moving the pressing means forward and backward in the axial direction of the pipe material;
The pressing means uses a moving means to select a first position where each inner circumferential side roller protrudes radially outward on each pressing surface and a second position separated from a position where the pressing surface presses the inner circumferential roller. The pipe material straightening device according to claim 1, wherein the pipe material straightening device can be taken automatically.   In the pressing means, the pressing surface is formed in a polygonal pyramid shape including a plurality of tapered surfaces, and the inner peripheral side roller is moved with respect to the inner peripheral surface of the pipe material by moving the pressing means back and forth in the axial direction of the pipe material. The pipe straightener according to claim 1, wherein the pipe straightener is advanced and retracted in a radial direction.   4. The pressure unit according to claim 1, wherein the pressing unit is connected to the rotating unit via a connecting member that is inserted through the pipe member, and an inner peripheral roller can be rotated integrally with the pressing unit. The tube straightener described.   The pipe material correcting device according to any one of claims 1 to 4, wherein a plurality of divided parts divided in the circumferential direction are connected to the casing so as to be able to expand and contract in the circumferential direction.   The casing includes a ring-shaped casing body having an inclined surface facing the outer peripheral surface of the tube material, and an inclined surface that is detachable between the inclined surface of the casing body and the tube material and can contact the inclined surface The pipe material straightening device according to claim 1, further comprising: a taper ring including a taper ring.

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